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