Q.1.
Heat of combustion of acetylene is ... [ EAMCET 1994]
-
20%
a) +228 kJ
-
60%
b) -228 kJ
-
0%
c) +100 kJ
-
20%
d) -100 kJ
Q.2.
The heat of neutralization of aqueous hydrochloric acid by NaOH is x kcal/mole of HCl. Calculate the heat of neutralization per mole of aqueous acetic acid .. [ ISM Dhanbad 1994]
-
20%
a) 0.5x kcal
-
40%
b) x kcal
-
20%
c) 2x kcal
-
20%
d) can not be calculated from the iven data
Q.3.
Which of the following statement is true? The entropy of the universe.. [ MP PMT 1993]
-
33%
a) Increase and tends towards maximum value
-
17%
b) decreases and tends to zero
-
17%
c) remains constant
-
33%
d) decreases and increases with a periodic rate.
Q.4.
Gibb's free energy G, enthalpy H and entropy S are related to one another by ... [ BHU 1994]
-
0%
a) G=H + TS
-
100%
b) G=H - TS
-
0%
c) G - TS=H
-
0%
d) S=H - G
Q.5.
ΔS° will be highest for reaction ... [ AIIMS 1994]
-
0%
a) Ca(s) + ½O2(g) → CaO(s)
-
60%
b) CaCO3(s) → CaO(s) + CO2(g)
-
20%
c) C + O2 → CO2(g)
-
20%
d) N2(g) + O2(g) → 2NO(g)
Q.6.
Heat of neutralization of strong acid against strong base is constant and is equal to.. [ MP PMT 1999]
-
50%
a) 13.7 kcal
-
17%
b) 57 kJ
-
17%
c) 5.7 ×104 J
-
17%
d) All of the above
Q.7.
The total entropy for a system and its surrounding increases, if the process is ...[ MP PMT]
-
17%
a) reversible
-
50%
b) irreversible
-
17%
c) exothermic
-
17%
d) endothermic
Q.8.
A chemical reaction will be spontaneous if it is accompanied by a decrease of ... [CBSE PMT 1994]
-
0%
a) entropy of the system
-
60%
b) enthalpy of the system
-
0%
c) internal energy of the system
-
40%
d) free energy of the system
Q.9.
Consider the following reaction occurring in an automobile2C8H18(g) + 25O2(g) → 16CO2 + 18H2O (g)the sign of ΔH, ΔS and ΔG would be.. .. [ CBSE PMT 1994]
-
20%
a) +, - , +
-
60%
b) -, +, -
-
0%
c) -, +, +
-
20%
d) +, +, -
Q.10.
Which of the following is true for the reactionH2O(l) ⇌ H2O (g) at 100°C and 1atmosphere? [ KCET 1991]
-
20%
a) ΔS=0
-
0%
b) ΔH=0
-
40%
c) ΔH=ΔE
-
40%
d) ΔH=T ΔS
Q.11.
For a system in equilibrium, ΔG=0, under conditions of constant... [ KCET 1991]
-
40%
a) temperature and pressure
-
40%
b) temperature and volume
-
20%
c) energy and volume
-
0%
d) pressure and volume
Q.12.
Enthalpy for the reaction C + O2→ CO2 is ... [ DPMT 1987]
-
50%
a) positive
-
33%
b) negative
-
0%
c) zero
-
17%
d) none
Q.13.
At a given temperature, the energy of activation of two reactions is same if ...[ IIT 1993]
-
20%
a) the specific rate constant for the two reactions is same
-
20%
b) the temperature coefficient for the specific rate constant for the two reactions is same
-
40%
c) ΔH from the two reactions is the same but not zero
-
20%
d) ΔH for the two reaction is zero
Explanation
Q.14.
Enthalpy of a compound is equal to its... [ CMC Vellore 1991]
-
40%
a) heat of combustion
-
20%
b) Heat of formation
-
20%
c) heat of reaction
-
20%
d) heat of solution
Q.15.
Identify the state function among the following ... [ IIT 1993]
-
0%
a) q
-
20%
b) q-w
-
40%
c) q/w
-
40%
d) q+w
Q.16.
When 0.2 g of butanol-1 was burnt in a suitable apparatus, the heat evolved was sufficient to raise the temperature of 200g water by 5°C. The heat of combustion of butanol-1 in kcal/mole will be ( mol mass of butanol-1=74)
-
0%
b) 74
-
67%
c) 37
-
17%
a) 14.8
-
17%
d) 370
Q.17.
During isothermal expansion of an ideal gas, its... [ CBSE PMT 1994]
-
20%
a) internal energy increases
-
40%
b) enthalpy decreases
-
20%
c) enthalpy remains unaffected
-
20%
d) enthalpy reduces to zero
Q.18.
A particular reaction has a negative value for free energy change. Then at ordinary temperature .. [ Pb. CET 1991]
-
20%
a) it has a large -ve value for entropy change
-
0%
b) it has a large +ve value for enthalpy change
-
40%
c) it has a large +ve value for enthalpy change
-
40%
d) it has a +ve value for entropy change and a -ve value for the enthalpy change
Q.19.
For an endothermic reaction where ΔH represents the enthalpy of the reaction in kJ/mol, the minimum value for the energy of activation will be ... [ IIT 1992]
-
20%
a) less than ΔH
-
0%
b) zero
-
80%
c) more than ΔH
-
0%
d) equal to ΔH
Q.20.
The heat of combustion of benzene at 27°C found by bomb calorimeter i.e. for the reactionC6H6(l) + 7.5 O2(g) → 6CO2(g) + 3H2O(l)is 780 kcal/mol. The heat evolved on burning 39g of benzene in an open vessel will be .. [ Manipal PMT 2001]
-
60%
a) 390 kcal
-
0%
b) 780.9 kcal
-
40%
c) 390.45 kcal
-
0%
d) 780 kcal
Q.21.
Which one of the following bonds has the highest average bond energy (kcal/mol)? [ CPMT 1992]
-
0%
a) S=O
-
40%
b) C=C
-
40%
c) C Ξ N
-
20%
d) N Ξ N
Q.22.
Foe the spontaneity of a reaction which statement is true? [ KCET 1988]
-
0%
a) ΔG=+ve ; ΔH=+ve
-
60%
b) ΔH=+ve; ΔS=-ve
-
20%
c) ΔG=-ve; ΔS=-ve
-
20%
d) ΔH=-ve; ΔS=+ve
Q.23.
The amount of heat measured for a reaction in bomb calorimeter is ... [ AIIMS 1991]
-
0%
a) ΔG
-
83%
b) ΔH
-
17%
c) ΔE
-
0%
d) PΔV
Q.24.
One mole of methanol, when burnt in oxygen, gives out 723kJ/mol heat. If one mole oxygen is used, what will be the amount of heat evolved? [ DCE 1994]
-
40%
a) 723 kJ
-
40%
b) 964 kJ
-
0%
c) 482 kJ
-
20%
d) 241 kJ
Q.25.
A well stoppered thermos flask contains some ice cubes. This is an examples of a ... [ AIIMS 1974]
-
0%
a) closed system
-
0%
b) open system
-
83%
c) isolated system
-
17%
d) non-thermodynamics system
Q.26.
In which of the following neutralization reaction, the heat of neutralization will be highest? [ MP PMT 1991]
-
17%
a) NH4OH and H2SO4
-
50%
b) HCl and NaOH
-
17%
c) CH3COOH and KOH
-
17%
d) CH3COOH and NH4OH
Q.27.
A system changes its state from A to B. The resulting change of entropy will be a definite quantity ... [ Pb CET 1991]
-
0%
a) When the change is reversible one
-
40%
b) When change is irreversible one
-
40%
c) When the change is an isothermal one
-
20%
d) always irrespective of the manner in which the change is brought about
Q.28.
For the reactionN2 + 3H2 ⇌ 2NH3, ΔH=? .. [ CBSE PMT 1991]
-
25%
a) ΔE + 2RT
-
50%
b) ΔE - 2RT
-
0%
c) ΔE + RT
-
25%
d) ΔE - RT
Q.29.
An exothermic reaction is one in which the reacting substances.. [ CPMT 1974]
-
20%
a) Have more energy than the product
-
20%
b) Have less energy than the products
-
20%
c) Have the same energy as the products
-
40%
d) are at a higher temperature than the products.
Q.30.
The heat absorbed in a reaction at constant temperature and volume is equal to ..[ Pb. CET 1991]
-
40%
a) ΔU of the reaction
-
20%
b) ΔHof the reaction
-
40%
c) -ΔU of the reaction
-
0%
d) -ΔH of the reaction