Practice the CHEMISTRY Past Questions with Answers. The questions are answered by our experts and you will get the correct answers to the CHEMISTRY questions.
Prepare yourself for the exam ahead and test your knowledge and readiness.
0% SSCE/NECO/GCE (CHEMISTRY PAST QUESTIONS) CHEMISTRY PAST QUESTIONS APP Questions will be picked at random from the question bank. You can use the NEXT button to move to the next question, use the PREV button to move to the previous question, the CLEAR button to clear any answer of your choice and you have the FINISH button to end the exam if you choose to. Any question not answered before the end of the exam time, will be marked as wrong and the exam will end by itself. so try to attempt all questions on time. Goodluck! 1 / 80 Category: CHEMISTRY PAST QUESTIONS The atoms of four elements are represented as 20Q, 16R, 10S and 8T Which of the elements would be unreactive? T R Q S 2 / 80 Category: CHEMISTRY PAST QUESTIONS Which of the orbitals 4s, 4p, 4d and 4f has the lowest energy? 4f 4s 4d 4p 3 / 80 Category: CHEMISTRY PAST QUESTIONS A reaction is represented by the equation below. A2(g) + B2(g) 2AB(g); ∆H = +X kJmol-1 Which of the following statements about the system is correct? At equilibrium increase in temperature favours the reverse reaction The reaction goes to completion at equilibrium The forward reaction is exthermic Pressure has no effect on the equilibrium mixture 4 / 80 Category: CHEMISTRY PAST QUESTIONS Which of the following compounds dissolves in water to form a solution with pH below 7? Sodium trioxocarbonate (IV) Sodium tetraoxosulphate (VI) Potassium hydroxide Ammonium chloride 5 / 80 Category: CHEMISTRY PAST QUESTIONS P Total = F1 + P2 + P 3 + .........Pn' where P Total is the pressure of a mixture of gasses. The equation above is an expression of Boyle's law Gay-Lussac's Law Graham's law Dalton's law 6 / 80 Category: CHEMISTRY PAST QUESTIONS What is the oxidation number of nitrogen in AI(NO3)3? + 5 + 3 + 1 + 6 7 / 80 Category: CHEMISTRY PAST QUESTIONS The liquid product of the destructive distillation of coal is ethanol kerosene ammoniacal liquor paraffin oil 8 / 80 Category: CHEMISTRY PAST QUESTIONS The spontaneity of a chemical reaction is determined by the change in the free energy of the system concentration of the reactants pressure applied to the system temperature of the system 9 / 80 Category: CHEMISTRY PAST QUESTIONS A radioactive solid is best stored under ultraviolet light in a cool, dark cupboard in a box lined with lead under paraffin oil 10 / 80 Category: CHEMISTRY PAST QUESTIONS In the Periodic Table, the elements that loss electrons most readily belong to Group V11 A Group 1 A Group 11 A Group 111 A 11 / 80 Category: CHEMISTRY PAST QUESTIONS When alkanols react with sodium, the ga evolved is hydrogen ethyne oxygen methane 12 / 80 Category: CHEMISTRY PAST QUESTIONS Calcium atom ionizes by losing two electrons gaining two electrons gaining two protons sharing two electrons 13 / 80 Category: CHEMISTRY PAST QUESTIONS Petrol consists mainly of polymers alktanols alkanoates hydrocarbons 14 / 80 Category: CHEMISTRY PAST QUESTIONS What is the effect of using vanadium (V) oxide as catalyst in the reaction represented by the following equation? 2SO2 + O2 ⇌ 2SO3; ∆H = - xKJmol-1 Reduces the time for attainment of equilibrium Decreases the value of ∆H Increases the collision rate of reactant particles Shifts equilibrium position to the right 15 / 80 Category: CHEMISTRY PAST QUESTIONS Chemical equilibrium is attained when reactants stop forming the products reactants in the system are used up concentrations of the reactants and products remain constant concentrations of the products are greater than those of the reactants 16 / 80 Category: CHEMISTRY PAST QUESTIONS Which of the following occurs when a solution of CuSO4 is electrolysed using copper electrodes? The anode increases in mass The cathode becomes coated with copper The blue colour of the solution fades gradually Both electrodes gain electrons 17 / 80 Category: CHEMISTRY PAST QUESTIONS Helium is preferred to hydrogen in filling balloons because hydrogen exhibits isotopy is diatomic is inflammable is a component of water 18 / 80 Category: CHEMISTRY PAST QUESTIONS Which of the following contains co-ordinate covalent bond? CH4 Na+CI NH4 HCI 19 / 80 Category: CHEMISTRY PAST QUESTIONS Which of the following pairs of reagents recat to produce hydrogen? Copper and dilute hydrochloric acid Water and calcium dicarbide Zinc and concentrated trioxonitrate (V) acid Magnesium and dilute tetraoxosulphate (VI) acid 20 / 80 Category: CHEMISTRY PAST QUESTIONS Which of the following features of a human skeleton can be determined by carbon-dating? Height Age Race Mass 21 / 80 Category: CHEMISTRY PAST QUESTIONS What will be the effect of increase in pressure on the following system at equilibrium? 2NH2(g) N2(g) + 3H2(g) the reaction will go to completion the forward reaction will be favoured the concentration of ammonia will increase Activation energy will decrease 22 / 80 Category: CHEMISTRY PAST QUESTIONS Which of the following statements about ideal gases is/are correct? I. The cohesive forces between their particles are negligible ll. The have no definite volume but occupy the volume of their containers III. They are not compressible IV. Their particles collide with loss of energy l, ll, lll, and IV l and ll only l only l, ll and lll only 23 / 80 Category: CHEMISTRY PAST QUESTIONS A mixture of calcium chloride and calcium trioxocarbonate (IV) in water can be separated by evaporation distillation filtration sublimation 24 / 80 Category: CHEMISTRY PAST QUESTIONS Elements which belong to the same group in the Periodic Table are characterized by difference of +1 in the oxidation numbers of successive members presence of the same number of outermost electrons in the respective atoms difference of 14 atomic mass units between successive members presence of the same number of electron shells in the respective atoms 25 / 80 Category: CHEMISTRY PAST QUESTIONS An exothermic reaction is one which involves loss of heat to the surrounding positive change in value of enthalpy attainment of dynamic equilibrium evolution of gas as it proceeds 26 / 80 Category: CHEMISTRY PAST QUESTIONS Aluminium is extracted from bauxite cassiterite magnetite cryolite 27 / 80 Category: CHEMISTRY PAST QUESTIONS If the solubility of KHCO3 is 0.40 mole dm-3 10.0g 4.0g 40.0g 100.0g 28 / 80 Category: CHEMISTRY PAST QUESTIONS Pauli Exclusion Principle is related to reversiblility of equlibrium reactions quantum numbers of electrons electronegativity values of elements collision theory of reaction rates 29 / 80 Category: CHEMISTRY PAST QUESTIONS Which of the following procedures is suitable for identifying the food colouring added to a pastry sample? The cathode becomes coated with copper The anode increases in mass The blue colour of the solution fades gradually Both electrodes gain electrons 30 / 80 Category: CHEMISTRY PAST QUESTIONS The type of chemical bond that exists between potassium and oxygen in potassium oxide is ionic dative covalent metallic 31 / 80 Category: CHEMISTRY PAST QUESTIONS Which of the following properties increases down a group in the Periodic Table? Ionization energy Electronegativity Electon affinity Atomic radius 32 / 80 Category: CHEMISTRY PAST QUESTIONS A finely divided from of a metal burns more readily in air than the rod from because the rod has higher molar mass smaller surface area protective oxide coating different chemical properties 33 / 80 Category: CHEMISTRY PAST QUESTIONS Consider the reaction represented by the following equation: H2(g) + 12(g) → 2HI(g). The number of effective collisions of molecules of the reactants decreases as the volume of the system is increased the pressure increased the temperature is raised a catalysty is intoduced into the system 34 / 80 Category: CHEMISTRY PAST QUESTIONS Given that the order of reactivity of four metals is P>Q>R>S, which of the following reactions is feasible? S + Q+ → Q + S+ Q + S+ → S + Q+ S + P+ → P + S + R + P+ → P + R+ 35 / 80 Category: CHEMISTRY PAST QUESTIONS Which of the following movements can be described as random motion? car travelling on a straight line planets going round the sun gas molecules colliding in a flask wheelbarrow being pushed 36 / 80 Category: CHEMISTRY PAST QUESTIONS One mole of a compound M(HCO3)2 has a mass of 162g. Calculate the relative atomic mass of M. [H = 1, C =12, O = 16] 40 101 122 53 37 / 80 Category: CHEMISTRY PAST QUESTIONS Which of the following lowers the activation energy of a chemical reaction? Water Freezing mixture Catalyst Reducing agent 38 / 80 Category: CHEMISTRY PAST QUESTIONS What is the function of sulphur (IV) oxide in the reaction represented by the following equation? SO 2(aq) + 2H2S(g) → 3S (s) + 2H 2O (l) Dehydrating agent Bleaching agent Oxidising agent Acid 39 / 80 Category: CHEMISTRY PAST QUESTIONS Which of the following substances decomposes when an electric current is passed through it? Zinc rod Hydrochloric acid Tetrachlormethane Glucose solution 40 / 80 Category: CHEMISTRY PAST QUESTIONS What is the shape of a molecule of CCI4? Trigonal planar Linear Pyramidal Tetrahedral 41 / 80 Category: CHEMISTRY PAST QUESTIONS 0.10 mol dm-3 NaCI conducts electricity better than 0.10 mol dm-3 CH3COOH because the solution of NaCI has a higher pH has a lower molar mass is neutral to litmus contains more ions 42 / 80 Category: CHEMISTRY PAST QUESTIONS What is the value of x in the following equation? Cr2O72- + 14H+ + xe- → 2Cr3+ + 7H2O 1 6 8 12 43 / 80 Category: CHEMISTRY PAST QUESTIONS Which of the following is not correct about oxidation number convention? The oxidation number of a/an monatomic ion is equal to its charge element in the free state is zero atom of a diatomic molecules is + 2 alkali meta like sodium in its compounds is + 1 44 / 80 Category: CHEMISTRY PAST QUESTIONS Metals are said to be malleable because they are good conductors heat can be alloyed are good conductors of electricity can be beaten into sheets 45 / 80 Category: CHEMISTRY PAST QUESTIONS Which of the following can undergo both addition reactions and substitution reactions? Hexane Pentane Propene Benzene 46 / 80 Category: CHEMISTRY PAST QUESTIONS Consider the following equation: Ag+ (aq) + CI-(aq) → Ag+CI- (s) ; ∆H = _65.7 kJmol-1. From the equation, it can be deduced that a solid is formed and heat is evolved the reaction is endothermic and occurs at high temperature activation energy is high and a catalyst is required direct combination is involved and the reaction is endothermic 47 / 80 Category: CHEMISTRY PAST QUESTIONS Dehydration of ethanol produces propan-1,2,3-triol ethene ethanoic acid ethanal 48 / 80 Category: CHEMISTRY PAST QUESTIONS A sheet of paper is placed in the path of a beam from a radioactive source. The emissions that pass through the paper consist of beta particles and gamma rays alpha particles and gamma rays alpha particles only alpha and beta particles 49 / 80 Category: CHEMISTRY PAST QUESTIONS Chlorine atom forms CI by Sharing one electron Donating lone pair of electrons Losing one electron Gaining one electron 50 / 80 Category: CHEMISTRY PAST QUESTIONS What is responsible for metallic bonding? Attraction between positive and negative ions Attraction between the atomic unclei and cloud of electrons Sharing of electrons between the metal atoms transfer of electrons from one atom to another 51 / 80 Category: CHEMISTRY PAST QUESTIONS Which of the following compounds dissolves in water to give an alkaline solution? Potassium oxide Ammonium chloride Sulphur (IV) oxide Sodium chloride 52 / 80 Category: CHEMISTRY PAST QUESTIONS It can be concluded that gastric juice is acidic contains enzymes is a mixture has pH value of 7 53 / 80 Category: CHEMISTRY PAST QUESTIONS Gas molecules are said to be perfectly elastic because the distances between them are negligible the volume occupied by them is negligible they move about in straight lines they collide without loss of energy 54 / 80 Category: CHEMISTRY PAST QUESTIONS What type of reaction is involved when wood shavings produce a brown gas with concentrated HNO3? Dehydration Destructive distillation Redox reaction Nutralization 55 / 80 Category: CHEMISTRY PAST QUESTIONS The presence of unpaired electrons in an atom of a transition metal gives rise to paramagnetism shiny appearance ductility nalleability 56 / 80 Category: CHEMISTRY PAST QUESTIONS Which of the following non-metals reacts most readily with metals? Chlorine Nitrogen Carbon Sulphur 57 / 80 Category: CHEMISTRY PAST QUESTIONS The crystal layers in graphite are held together by van der Waals' forces covalent bonds hydrogen bonds electrostatic forces 58 / 80 Category: CHEMISTRY PAST QUESTIONS What does ∆H represent in the following equation ? Cl(g) + e- → CI- (g); ∆H = - 363 kJ mol-1 lonization energy Heat of atomization Electron affinity Dissociation energy 59 / 80 Category: CHEMISTRY PAST QUESTIONS A concentrated solution containing H+, Cu2+,OH- and CI- was electrolysed using platiunm electrodes which of the ions will be discharged at the cathods? Cu2+ OH- H+ CI- 60 / 80 Category: CHEMISTRY PAST QUESTIONS Exhaust fumes discharged from a smoky vehicle gradually become invisible as a result of diffusion emission absorption combustion 61 / 80 Category: CHEMISTRY PAST QUESTIONS If an element with high electron affinity combines with another element with low ionization energy the bond formed will be mainly ionic covalent metallic dative 62 / 80 Category: CHEMISTRY PAST QUESTIONS Which of the following increases as boiling water changes to steam? temperature of the system number of molecules activation energy degree of disorder in the system 63 / 80 Category: CHEMISTRY PAST QUESTIONS Two radioactive elements Q and S have half-life periods of 10 hours and 20 hours respectively. Therefore S is more stable than Q Q emits fewer particles than S Q is twice as stable as S S decays faster than Q 64 / 80 Category: CHEMISTRY PAST QUESTIONS Which of the following will displace copper from a solution of copper (ll) salt? Silver Magnesium Aluminium ions Zinc ions 65 / 80 Category: CHEMISTRY PAST QUESTIONS What volume of hydrogen is produced at s.t.p. When 2.60 g of zinc reacts with excess HCI according to the following equation? Zn(s) + 2HCI(aq) → ZnCI 2(aq) + H2(g) [Zn = 65; 1 mole of a gas occupies 22.4dm3 at s.t.p] 8.62dm 3 0.040dm 3 0.896dm 3 5.82dm 3 66 / 80 Category: CHEMISTRY PAST QUESTIONS Pipe-borne water is usually chlorinated in order to coagulate sediments in the water remove the hardness in the water clear improve the teste of the water kill harmful bacteria in the water 67 / 80 Category: CHEMISTRY PAST QUESTIONS What is oxidized in the reaction represented by the following equation? 3CU + 8HNO3 → 3Cu(NO3)2 + 2NO + 4H2O Hydrogen Nitrogen Oxygen Copper 68 / 80 Category: CHEMISTRY PAST QUESTIONS Which of the following methods is suitable for the preparation of an insoluble salt? Neutralisation Double decomposition Action of an acid on a metal Action of an acid on a trioxocarbonate (IV) 69 / 80 Category: CHEMISTRY PAST QUESTIONS Elactrostatic force of attraction between sodium ion and halide ion is greatest in NaCI NaI NaF NaBr 70 / 80 Category: CHEMISTRY PAST QUESTIONS The gas evolved when dilute tetraoxosulphate (VI) acid reacts with sodium hydrogen trioxocarbonate (IV) is oxygen carbon (IV) oxide sulphur (VI) oxide hydrogen 71 / 80 Category: CHEMISTRY PAST QUESTIONS The property of calcium chloride which makes it useful as a drying agent is that it is a strong electrolyte ionic deliquescent a normal salt 72 / 80 Category: CHEMISTRY PAST QUESTIONS How many electrons are removed from Cr2- when it is oxidized to CrO42-? 0 4 2 8 73 / 80 Category: CHEMISTRY PAST QUESTIONS 30cm3 pf hydrogen at s.t.p combine with 20cm3 of oxygen to form steam according to the following equation 2H2(g) + O2(g) → 2H2O(g). Calculate the total volume of the gaseous mixture at the end of the reaction 30cm cube 50cm cube 35cm cube 25cm cube 74 / 80 Category: CHEMISTRY PAST QUESTIONS Equal volumes of CO2 cnd CO at s.t.p have the same rate of diffusion density number of molecules mass 75 / 80 Category: CHEMISTRY PAST QUESTIONS Substances which absorb water from the atmosphere without dissolving in it are said to be hygroscopic hydrated insolube anhydrous 76 / 80 Category: CHEMISTRY PAST QUESTIONS Which of the following would dissolve in warm dilute H2SO4 without effervescence, to give a blue solution? Copper (ll) trioxocarbonate (IV) Copper alloy Copper turnings Copper (ll) oxide 77 / 80 Category: CHEMISTRY PAST QUESTIONS Electrovalent compounds are characterized by solubility in ethanol strong oxidizing ability high melting point high molar mass 78 / 80 Category: CHEMISTRY PAST QUESTIONS Rusting of iron is an example of redox reaction displacement reaction deliquescence decomposition 79 / 80 Category: CHEMISTRY PAST QUESTIONS What mass of copper would be deposited by a current of 1. 0 ampere passing for 965 seconds through copper (ll) tetraoxosulphate (IV) solution? [Cu = 63.5; 1F = 96500C] 0.635g 18g 6.35g 0.318g 80 / 80 Category: CHEMISTRY PAST QUESTIONS Which of the following will produce oxygen and hydrogen during its electrolysis using platinum electrode? Glucose solution Concentrated hydrochloric acid Aqueous copper (ll) tetraoxosulphate (IV) Dilute sodium chloride solution Your score is 0% Restart quiz
SSCE/NECO/GCE (CHEMISTRY PAST QUESTIONS)
CHEMISTRY PAST QUESTIONS APP
Questions will be picked at random from the question bank.
You can use the NEXT button to move to the next question, use the PREV button to move to the previous question, the CLEAR button to clear any answer of your choice and you have the FINISH button to end the exam if you choose to.
Any question not answered before the end of the exam time, will be marked as wrong and the exam will end by itself. so try to attempt all questions on time.
Goodluck!
1 / 80
Category: CHEMISTRY PAST QUESTIONS
The atoms of four elements are represented as 20Q, 16R, 10S and 8T Which of the elements would be unreactive?
2 / 80
Which of the orbitals 4s, 4p, 4d and 4f has the lowest energy?
3 / 80
A reaction is represented by the equation below. A2(g) + B2(g) 2AB(g); ∆H = +X kJmol-1 Which of the following statements about the system is correct?
4 / 80
Which of the following compounds dissolves in water to form a solution with pH below 7?
5 / 80
P Total = F1 + P2 + P 3 + .........Pn' where P Total is the pressure of a mixture of gasses. The equation above is an expression of
6 / 80
What is the oxidation number of nitrogen in AI(NO3)3?
7 / 80
The liquid product of the destructive distillation of coal is
8 / 80
The spontaneity of a chemical reaction is determined by the change in the
9 / 80
A radioactive solid is best stored
10 / 80
In the Periodic Table, the elements that loss electrons most readily belong to
11 / 80
When alkanols react with sodium, the ga evolved is
12 / 80
Calcium atom ionizes by
13 / 80
Petrol consists mainly of
14 / 80
What is the effect of using vanadium (V) oxide as catalyst in the reaction represented by the following equation? 2SO2 + O2 ⇌ 2SO3; ∆H = - xKJmol-1
15 / 80
Chemical equilibrium is attained when
16 / 80
Which of the following occurs when a solution of CuSO4 is electrolysed using copper electrodes?
17 / 80
Helium is preferred to hydrogen in filling balloons because hydrogen
18 / 80
Which of the following contains co-ordinate covalent bond?
19 / 80
Which of the following pairs of reagents recat to produce hydrogen?
20 / 80
Which of the following features of a human skeleton can be determined by carbon-dating?
21 / 80
What will be the effect of increase in pressure on the following system at equilibrium? 2NH2(g) N2(g) + 3H2(g)
22 / 80
Which of the following statements about ideal gases is/are correct?
I. The cohesive forces between their particles are negligible
ll. The have no definite volume but occupy the volume of their containers
III. They are not compressible
IV. Their particles collide with loss of energy
23 / 80
A mixture of calcium chloride and calcium trioxocarbonate (IV) in water can be separated by
24 / 80
Elements which belong to the same group in the Periodic Table are characterized by
25 / 80
An exothermic reaction is one which involves
26 / 80
Aluminium is extracted from
27 / 80
If the solubility of KHCO3 is 0.40 mole dm-3
28 / 80
Pauli Exclusion Principle is related to
29 / 80
Which of the following procedures is suitable for identifying the food colouring added to a pastry sample?
30 / 80
The type of chemical bond that exists between potassium and oxygen in potassium oxide is
31 / 80
Which of the following properties increases down a group in the Periodic Table?
32 / 80
A finely divided from of a metal burns more readily in air than the rod from because the rod has
33 / 80
Consider the reaction represented by the following equation: H2(g) + 12(g) → 2HI(g). The number of effective collisions of molecules of the reactants decreases as
34 / 80
Given that the order of reactivity of four metals is P>Q>R>S, which of the following reactions is feasible?
35 / 80
Which of the following movements can be described as random motion?
36 / 80
One mole of a compound M(HCO3)2 has a mass of 162g. Calculate the relative atomic mass of M. [H = 1, C =12, O = 16]
37 / 80
Which of the following lowers the activation energy of a chemical reaction?
38 / 80
What is the function of sulphur (IV) oxide in the reaction represented by the following equation? SO 2(aq) + 2H2S(g) → 3S (s) + 2H 2O (l)
39 / 80
Which of the following substances decomposes when an electric current is passed through it?
40 / 80
What is the shape of a molecule of CCI4?
41 / 80
0.10 mol dm-3 NaCI conducts electricity better than 0.10 mol dm-3 CH3COOH because the solution of NaCI
42 / 80
What is the value of x in the following equation? Cr2O72- + 14H+ + xe- → 2Cr3+ + 7H2O
43 / 80
Which of the following is not correct about oxidation number convention? The oxidation number of a/an
44 / 80
Metals are said to be malleable because they
45 / 80
Which of the following can undergo both addition reactions and substitution reactions?
46 / 80
Consider the following equation: Ag+ (aq) + CI-(aq) → Ag+CI- (s) ; ∆H = _65.7 kJmol-1. From the equation, it can be deduced that
47 / 80
Dehydration of ethanol produces
48 / 80
A sheet of paper is placed in the path of a beam from a radioactive source. The emissions that pass through the paper consist of
49 / 80
Chlorine atom forms CI by
50 / 80
What is responsible for metallic bonding?
51 / 80
Which of the following compounds dissolves in water to give an alkaline solution?
52 / 80
It can be concluded that gastric juice
53 / 80
Gas molecules are said to be perfectly elastic because
54 / 80
What type of reaction is involved when wood shavings produce a brown gas with concentrated HNO3?
55 / 80
The presence of unpaired electrons in an atom of a transition metal gives rise to
56 / 80
Which of the following non-metals reacts most readily with metals?
57 / 80
The crystal layers in graphite are held together by
58 / 80
What does ∆H represent in the following equation ? Cl(g) + e- → CI- (g); ∆H = - 363 kJ mol-1
59 / 80
A concentrated solution containing H+, Cu2+,OH- and CI- was electrolysed using platiunm electrodes which of the ions will be discharged at the cathods?
60 / 80
Exhaust fumes discharged from a smoky vehicle gradually become invisible as a result of
61 / 80
If an element with high electron affinity combines with another element with low ionization energy the bond formed will be mainly
62 / 80
Which of the following increases as boiling water changes to steam?
63 / 80
Two radioactive elements Q and S have half-life periods of 10 hours and 20 hours respectively. Therefore
64 / 80
Which of the following will displace copper from a solution of copper (ll) salt?
65 / 80
What volume of hydrogen is produced at s.t.p. When 2.60 g of zinc reacts with excess HCI according to the following equation? Zn(s) + 2HCI(aq) → ZnCI 2(aq) + H2(g) [Zn = 65; 1 mole of a gas occupies 22.4dm3 at s.t.p]
66 / 80
Pipe-borne water is usually chlorinated in order to
67 / 80
What is oxidized in the reaction represented by the following equation? 3CU + 8HNO3 → 3Cu(NO3)2 + 2NO + 4H2O
68 / 80
Which of the following methods is suitable for the preparation of an insoluble salt?
69 / 80
Elactrostatic force of attraction between sodium ion and halide ion is greatest in
70 / 80
The gas evolved when dilute tetraoxosulphate (VI) acid reacts with sodium hydrogen trioxocarbonate (IV) is
71 / 80
The property of calcium chloride which makes it useful as a drying agent is that it is
72 / 80
How many electrons are removed from Cr2- when it is oxidized to CrO42-?
73 / 80
30cm3 pf hydrogen at s.t.p combine with 20cm3 of oxygen to form steam according to the following equation 2H2(g) + O2(g) → 2H2O(g). Calculate the total volume of the gaseous mixture at the end of the reaction
74 / 80
Equal volumes of CO2 cnd CO at s.t.p have the same
75 / 80
Substances which absorb water from the atmosphere without dissolving in it are said to be
76 / 80
Which of the following would dissolve in warm dilute H2SO4 without effervescence, to give a blue solution?
77 / 80
Electrovalent compounds are characterized by
78 / 80
Rusting of iron is an example of
79 / 80
What mass of copper would be deposited by a current of 1. 0 ampere passing for 965 seconds through copper (ll) tetraoxosulphate (IV) solution? [Cu = 63.5; 1F = 96500C]
80 / 80
Which of the following will produce oxygen and hydrogen during its electrolysis using platinum electrode?
Your score is
Restart quiz