Notes

1. TEST NO.22 CHEMISTRY
SKANS ENTRY TEST
SCHOOL OF ACCOUNTANCY
CHAPTER 7-11
Book 1st
1. The volume of the solution is slightly greater than the sum of individual volumes of the components then this
solution is
(a) An azeotropic mixture showing negative deviations form Rault’s law
(b) An azeotropic mixture showing positive deviations form Rault’s law
(c) Ideal solution that obeys Rault’s law
(d) Super saturated solution
2. The vapour pressure of a pure liquid is 60 toor at 25o
C.The vapour pressure of solution if 3 moles of this
substance are mixed with 2 moles of a non-volatile, non electrolyte, non electrolyte, is
(a) 48 torr (b) 40 torr (c) 36 torr (d) 30 torr
3. A solution of two liquids that boils at a lower temperature than either of the liquids, the solution is
(a) an ideal solution
(b) non ideal showing positive deviations form Rault’s law
(c) non ideal solution showing negative deviations form Rault’s law
(d) saturated
4. Which one of the following has discontinuous solubility curve
(a) CaCl2 (b) NaCl (c) KCl (d) NaNO3
5. Which one of the following has continuous solubility curve
(a) NH4NO3 (b) CaCl2 (c) CaCl2.6H2O (d) Na2SO4.10H2O
6. Saturated solution of a solid is prepared at a constant temperature.100 cm3
of this saturated solution is
evaporated in a chine dish. The mass of the residue is called
(a) azetropic mixture (b) solubility (c) solubility product (d) equilibrium constant
7. Solubility of a substance in water increases with rise in temperature except
(a) CaCl2.6H2O (b) Pb (NO3)2 (c) K2Cr2O7 (d) Ce2(SO4)3
8. Aqueous solution of glucose C6H12O6, boils at 100.052o
C.The solution contains
(a) 180 grams glucaose in 1 kg water (b) 18 grams glucaose in 1 kg water
(c) 1.8 grams glucaose in 1 kg water (d) 3.6 grams glucaose in 1 kg water
9. Which of the following aqueous solutions have the lowest freezing point
(a) 5.85%NaCl (b) 6% urea (c) 34.2 sucrose (d) All of them have same freezing point
10. Which of the following aqueous solutions will have lower boiling point
(a) 7.45%KCl (b) 5.85%NaCl (c) 6% urea (d) 36% glucose
11. Which one of the following solution will have higher vapour pressure than that of water
(a) aqueous solution of methanol (b) aqueous solution of HCl
(c) aqueous solution of glucose (d) aqueous solution of urea
12. Which one of the following is used as antifreeze in the radiator
(a) methanol (b) ethanol (c) ethylene glycol (d) glycerin
13. The enthalpy change for the two reactions are given by the equation below
2Fe(s) + 1.502(g) Fe2O3(s) ΔHo
=- 822 KJ mol-1
C(s) + 1/202(g) CO(g) ΔHo
= -110 KJ mol-1
What is the enthalpy change for the following reaction?
3C(s) + Fe2O3(s) 2Fe(s) +3Co(g)
(a) +712 KJ mol-1
(b) +492KJ mol-1
(c) -932KJ mol-1
(d) -960KJ mol-1
14. The heat of formation of SO2(g) is -70.9 Kcal. The energy required for the decomposition of 1 mole of SO2(g) is
(a) 35.50 Kcal (b) 70.9Kcal (c) 141.8 Kcal (d) -35.9 Kcal
15. Heat of neutralization of weak acid and strong base is
(a) 13.7 Kcal (b) less than 13.7Kcal (c) grater than 13.7Kcal (d) None of them
16. The SI unit for heat and energy is
(a) joule (b) K.Calorie (c) calorie (d) K. watt hours
17. The reaction in which heat is evolved from the system to the surrounding is called
(a) endothermic (b) exothermic (c) fast reaction (d) emitter

2. 18. The chemical reactions in which heat energy is released is called
(a) exothermic (b) endothermic (c) none of these (d) both of these
19. When ΔH for a reaction is a negative quantity the reaction is said to be
(a) reversible (b) at equilibrium (c) exothermic (d) endothermic
20. The ΔH for a reaction is -110 Kcal/mole, which shows that the reaction is
(a) endothermic (b) exothermic (c) not stable (d) it needs catalyst
21. Which of the following equation represents the first law of thermodynamic
(a) ΔE = q+w (b) ΔE = q (c) q = w (d) w = ΔP ΔV
22. If ΔV is zero, then pressure – volume work is
(a) zero (b) +ve (c) -ve (d) B+C
23. For an exothermic reaction, the sign of enthalpy will be
(a) negative (b) positive (c) zero (d)None of them
24. For the reaction NaOH+HCl NaCl+ H2O the change in enthalpy
(a) heat of reaction (b) heat of formation (c) heat of neutralization (d) heat of combustion
25. For the reaction H2(g) +l2(g) 2Hl(g) the equilibrium constant changes with
(a) catalyst (b) total amount of H2 and l2 (c) temperature (d) total pressure
26. The ionization of NH4OH is suppressed by adding
(a) NaCl (b) HCl (c) NH4OH (d) NH4Cl
27. According to Le-chatelier principle, the formation of NO2 at equilibrium in the reaction
2NO+O2 2NO2+heat should be favoured by
(a) high temperature , high pressure (b) low temperature ,low pressure
(c) low temperature and high pressure (d) high temperature
28. Formation of SO3 takes place according to the reaction 2SO+O2 2SO3, ΔH =-45.2Kcal
Which of the following factors will favour the formation of SO3?
(a) increase in temperature (b) increase in pressure (c) removal of oxygen (d) increase of volume
29. The concentration of Hl,H2 and l2 at equilibrium in the reaction H2+l2 2Hl are 10.5 and 5 mol/L
respectively. The value of equilibrium constant is
(a) 4 (b) 10 (c) 100 (d) 5
30. Reaction which proceeds on both sides and never goes to completion is called
(a) reversible reaction (b) equilibrium reaction (c) irreversible reaction (d) None of these
31. The dynamic equilibrium is the state of a reversible chemical reaction at which the rate of reverse reaction
at the given conditions of temperature and pressure and rate of forward reaction are
(a) equal (b) less (c) more (d) changes constantly
32. The unit of concentration is
(a) mol. ml (b) mol dm-3
(c) gm equivalent lit-1
(d) g.lit-1
33. When rate of forward reaction is equal to the rate of backward reaction then the equilibrium is called
(a) state of equilibrium (b) dynamic equilibrium (c) equilibrium (d) static equilibrium
34. The rate of a chemical reaction is directly proportional to the product of the molar concentration of the
(a) products (b) reactions (c) concentrations (d) catalysts
35. The energy required in addition to average energy of reactants to convert them into products is called
(a) enthalpy function (b) heat of reaction (c) effective energy (d) activation energy
36. A substance that affects the rate of reaction but remains unchanged at the end of the reaction is called
(a) catalyst (b) electrolyte (c) acid (d) poison
37. Zn does not displace Mg from MgSO4 solution because
(a) Zn is more electropositive than Mg
(b) Zn is below Mg in electrochemical series
(c) Zn is above Mg in electrochemical series
(d) Zn is trivalent Mg is divalent
38. Standard reduction of Zn = -0.76 V and that of Ni is -0.25 V. On coupling them by a salt bridge which of
these will act as anode
(a) salt bridge will act as anode (b) Zn will act as anode (c) Ni will act as anode (d) None of these
39. Which statement is correct for balancing of redox reactions by oxidation number method
(a) equate the increase and decrease in oxidation state of the atoms
(b) electrons are added or subtracted to balance to oxidation number
(c) split the reaction into two halves
(d) add H2O and H+
to balance O and H atoms

3. 40. In the reaction K2Cr2O7 + HCl + CrCl3 + Cl2 + H2O the element which is reduced is
(a) K (b) Cl (c) Cr (d) H
41. In passage of electricity through aqueous solution of AgNO3 silver dissolves at anode to form Ag+
, the
electrodes are
(a) silver metal (b) Pt metal (c) graphite (d) copper metal
42. When aqueous solution of NaOH is electrolyzed using graphite electrodes, the product obtained at anode is
(a) O2 gas (b) H2 gas (c) Na metal (d) Na2O
43. A electrolytic cell consisting of chromic acids electrolyte using Al metal as anode the product obtained at
anode is
(a) Cr metal (b) H2 gas (c) Cr2O3 (d) anodized Al
44. In the electrolysis of fused bauxite (Al2O3. 2H2O) with fused cryolite (Na3 AlF6) using carbon rods as anode,
the product obtained at cathode is
(a) Na metal (b) F2 gas (c) Al metal (d) O2 gas
45. F2,Cl2,Br2, and I2 lie below SHE in the Electro chemical series that is why these
(a) undergo reduction (b) undergo oxidation (c) liberate H2 gas with steam (d) None of these
46. In KO2 the oxidation state of oxygen is
(a) -2 (b) -1 (c) +1/2 (d) -1/2
47. Standard reduction potential of f is the highest in the electrochemical series which is
(a) +4.87 (b) +3.87 (c) +2.87 (d) +1.87
48. Fe can displace Cu form CuSO4 solution because
(a) Fe is ferromagnetic (b) Fe is below Cu in electrochemical series
(c) Fe is above Cu in electrochemical series (d) Fe exists in divalent oxidation state
49. Hydrogenation of vegetable oils is accelerated by Ni catalyst. The catalytic activity of Ni is increas3d by a
promoter of activator which is
(a) Na and K (b) Na and Hg (c) Hg and Zn (d) Cu and Te
50. In the reaction of oxalic acid with KMnO4 and H2SO4 is slow at the beginning but after sometime the reaction
becomes faster due to
(a) formation of MnSO4 which acts as Auto catalyst (b) formation of CO2 which acts as Auto catalyst
(c) formation of K2SO4 which acts as Auto catalyst (d) formation of O2 which acts as Auto catalyst
51. When copper is allowed to react with HNO3, the reaction is slow in the beginning, finally becomes very fast.
It is due to the formation of an auto catalyst which is
(a) Cu(NO3)2 (b) CuO (c) O2 (d) HNO2
52. For the conversion of sugar solution into glucose and fructose the enzyme for this
C12H22O11 + H2O C6H12O6 +C6H12O6 reaction is
(a) diastase (b) lipase (c) inverters (d) zymase
53. Complex protein molecules which catalyses the organic reactions in the living cells are called
(a) living organisms (b) enzymes (c) viruses (d) bacteria
54. The catalytic activity of enzymes is greatly enhanced by
(a) temperature (b) increasing (c) light (d) presence of co-enzyme or activator
55. The number of atoms or molecules which whose concentrations determine the rate of the reaction is called
(a) molecularity (b) order (c) rate of the reaction is called (d) rate constant
56. The experimental relationship between a reaction rate and the concentration of reactants is known as
(a) order (b) molecularity
(c) rate constant (d) rate law
57. Which of the following factors does not influenced the rate of reaction
(a) concentration of the reactants (b) nature of the reactants
(c) molecularity of the reaction (d) temperature
58. The activation energy of a reaction may be lowered
(a) by raising the temperature (b) by lowering the temperature
(c) by removing the products (d) by adding a catalyst
59. if the rate of reaction is independent of the concentration of the reactant, the reaction is of
(a) zero order (b) first order (c) second order (d) third order
60. Consider the following reaction and its rate law 3A + B + 2C D + 2E Rate = K[A][B]2
Doubling the concentration of A increases the rate of reaction by a factor of
(a) 2 (b) 3 (c) 4 (d) 9

4. Key for Chemistry Test 22 chap 7-11 book 1st
Q.No Answers Q.No Answers
1 B 31 A
2 C 32 B
3 B 33 B
4 A 34 B
5 A 35 C
6 B 36 A
7 D 37 B
8 A 38 B
9 A 39 A
10 C 40 C
11 A 41 A
12 C 42 A
13 B 43 D
14 B 44 C
15 B 45 A
16 A 46 D
17 B 47 C
18 A 48 C
19 C 49 D
20 B 50 D
21 A 51 D
22 A 52 C
23 A 53 B
24 C 54 D
25 C 55 B
26 D 56 D
27 C 57 B
28 B 58 D
29 A 59 A
30 A 60 A

5. Key for Chemistry Test 22 chap 7-11 book 1st
Q.No Answers Q.No Answers
1 31
2 32
3 33
4 34
5 35
6 36
7 37
8 38
9 39
10 40
11 41
12 42
13 43

6. 14 44
15 45
16 46
17 47
18 48
19 49
20 50
21 51
22 52
23 53
24 54
25 55
26 56
27 57
28 58
29 59
30 60

7. 14 44
15 45
16 46
17 47
18 48
19 49
20 50
21 51
22 52
23 53
24 54
25 55
26 56
27 57
28 58
29 59
30 60