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