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iz;kl vkoklh; fo|ky;] xqf<+;kjh] jk;iqj
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[k.M&c tho&foKku
1. The enthalpy change for a reaction does not depend upon
(a) The physical states of reactants and products
(b) Use of different reactants for the same product
(c) The nature of intermediate reaction steps
(d) The differences in initial or final temperatures of involved sustances
2. The heat required to raise the temperature of a body by 1 K is called
(a) Specific heat (b) Thermal capacity
(c)Water equivalent (d) None of these
3. The enthalpy change for the reaction
H
2
(g)+C
2
H
4
(g) C
2
H
6
(g) is ………………. The bond energies are,
H-H=103, C-H=99, C-C=80& C=C 145 K cal mol
-1
(a) -10 K cal mol
-1
(b) +10 K cal mol
-1
(c)-30 K cal mol
-1
(d) +30 K cal mol
-1
4. The heat of combustion of CH
4
(g),C(s) and H
2
(g) at 25
0
C are -212.4 K cal, -94.0 K cal and 68.4 K
cal respectively, the heat of formation of CH
4
will be
(a) +54.4 K cal (b) -18.4 K cal
(c)-375.2 K cal (d) +212.8 K cal
5. At a certain temperature T, the endothermic reaction AB proceeds almost to completion. The
entropy change is
(a) S=0 (b) S<0
(c)S>0 (d) Cannot be predicted
6. It the equilibrium constant for a reaction is 10, the the value of G
0
will be (R=8jk
-1
mol
-1
,
T=300K)
(a) +5.527 KJ mol
-1
(b) -5.527 KJ mol
-1
(c)+55.27 KJ mol
-1
(d) -55.27 KJ mol
-1
7. If G
0
>0 for a reaction then
(a) Kp>1 (b) Kp<1

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(c)The products predominate in the equilibrium mixture (d) None
8. The total entropy change for a system & its surroundings increases if the process is
(a) Reversible (b) Irreversible
(c)Exothermic (d) Endothermic
9. In which reaction S is positive
(a) H
2
O(l)H
2
O(s) (b) 3o
2
(g)2o
3
(g)
(c)H
2
O(l)H
2
O(g) (d) N
2
(g)+3H
2
O(g)2NH
3
(g)
10. The gaseous endothermic reaction P+Q2R+3S at 27
0
C takes place spontaneously, because
(a) H<O; S<O; (b) H>O; S>O
(c)H<O; S>O (d) H>O; S<O
11. At 0
0
C ice and water are in equilibrium and H
O
= 6.00kJ/mol for the process
H
2
O(s) H
2
O(l)
Value of ∆S
0
for the conversion of ice to liquid water is
(a) 10.15 JK
-1
mol
-1
(b) 17.25 JK
-1
mol
-1
(c)21.98 JK
-1
mol
-1
(d) 30.50 JK-1 mol
-1
12. For a spontaneous process the values of free energy and entropy change are respectively
(a) Postiove and negative (b) Negative and Positive
(c)Positive and Positive (d) Negative and negative
13. The bond dissociation energies of methane and ethane are 360 kcal mol
-1
and 620 kcal mol
-1
respectively. The C-C bond energy in kcal mol
-1
is
(a) 130 (b) 260
(c)180 (d) 80
14. Enthalpy of carbon, hytdrogen and ethyl alcohol on combusion at 25
0
C are -94.0, -68.4 and -
327.0 kcal per mole, then the formation enthaply of ethyl alcohol will be
(a) -66.2 Kcal/mol (b) 58.2 kcal
(c)60.2 kcal/mol (d) 60.4 kcal/mole
15. What is true for the reaction
PCl
5
(g)PCl
3
(g)+Cl
2
(g)
(a) H=E (b) H>∆E
(c)H<∆E (d) None of these

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