Q.1
Heat of combustion of acetylene is ... [ EAMCET 1994]
  • a) +228 kJ
  • b) -228 kJ
  • c) +100 kJ
  • 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]
  • a) 0.5x kcal
  • b) x kcal
  • c) 2x kcal
  • 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]
  • a) Increase and tends towards maximum value
  • b) decreases and tends to zero
  • c) remains constant
  • 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]
  • a) G=H + TS
  • b) G=H - TS
  • c) G - TS=H
  • d) S=H - G
Q.5
ΔS° will be highest for reaction ... [ AIIMS 1994]
  • a) Ca(s) + ½O2(g) → CaO(s)
  • b) CaCO3(s) → CaO(s) + CO2(g)
  • c) C + O2 → CO2(g)
  • 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]
  • a) 13.7 kcal
  • b) 57 kJ
  • c) 5.7 ×104 J
  • d) All of the above
Q.7
The total entropy for a system and its surrounding increases, if the process is ...[ MP PMT]
  • a) reversible
  • b) irreversible
  • c) exothermic
  • d) endothermic
Q.8
A chemical reaction will be spontaneous if it is accompanied by a decrease of ... [CBSE PMT 1994]
  • a) entropy of the system
  • b) enthalpy of the system
  • c) internal energy of the system
  • 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]
  • a) +, - , +
  • b) -, +, -
  • c) -, +, +
  • d) +, +, -
Q.10
Which of the following is true for the reactionH2O(l) ⇌ H2O (g) at 100°C and 1atmosphere? [ KCET 1991]
  • a) ΔS=0
  • b) ΔH=0
  • c) ΔH=ΔE
  • d) ΔH=T ΔS
Q.11
For a system in equilibrium, ΔG=0, under conditions of constant... [ KCET 1991]
  • a) temperature and pressure
  • b) temperature and volume
  • c) energy and volume
  • d) pressure and volume
Q.12
Enthalpy for the reaction C + O2→ CO2 is ... [ DPMT 1987]
  • a) positive
  • b) negative
  • c) zero
  • d) none
Q.13
At a given temperature, the energy of activation of two reactions is same if ...[ IIT 1993]
  • a) the specific rate constant for the two reactions is same
  • b) the temperature coefficient for the specific rate constant for the two reactions is same
  • c) ΔH from the two reactions is the same but not zero
  • d) ΔH for the two reaction is zero
Q.14
Enthalpy of a compound is equal to its... [ CMC Vellore 1991]
  • a) heat of combustion
  • b) Heat of formation
  • c) heat of reaction
  • d) heat of solution
Q.15
Identify the state function among the following ... [ IIT 1993]
  • a) q
  • b) q-w
  • c) q/w
  • 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)
  • b) 74
  • c) 37
  • a) 14.8
  • d) 370
Q.17
During isothermal expansion of an ideal gas, its... [ CBSE PMT 1994]
  • a) internal energy increases
  • b) enthalpy decreases
  • c) enthalpy remains unaffected
  • 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]
  • a) it has a large -ve value for entropy change
  • b) it has a large +ve value for enthalpy change
  • c) it has a large +ve value for enthalpy change
  • 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]
  • a) less than ΔH
  • b) zero
  • c) more than ΔH
  • 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]
  • a) 390 kcal
  • b) 780.9 kcal
  • c) 390.45 kcal
  • d) 780 kcal
Q.21
Which one of the following bonds has the highest average bond energy (kcal/mol)? [ CPMT 1992]
  • a) S=O
  • b) C=C
  • c) C Ξ N
  • d) N Ξ N
Q.22
Foe the spontaneity of a reaction which statement is true? [ KCET 1988]
  • a) ΔG=+ve ; ΔH=+ve
  • b) ΔH=+ve; ΔS=-ve
  • c) ΔG=-ve; ΔS=-ve
  • d) ΔH=-ve; ΔS=+ve
Q.23
The amount of heat measured for a reaction in bomb calorimeter is ... [ AIIMS 1991]
  • a) ΔG
  • b) ΔH
  • c) ΔE
  • 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]
  • a) 723 kJ
  • b) 964 kJ
  • c) 482 kJ
  • d) 241 kJ
Q.25
A well stoppered thermos flask contains some ice cubes. This is an examples of a ... [ AIIMS 1974]
  • a) closed system
  • b) open system
  • c) isolated system
  • d) non-thermodynamics system
Q.26
In which of the following neutralization reaction, the heat of neutralization will be highest? [ MP PMT 1991]
  • a) NH4OH and H2SO4
  • b) HCl and NaOH
  • c) CH3COOH and KOH
  • 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]
  • a) When the change is reversible one
  • b) When change is irreversible one
  • c) When the change is an isothermal one
  • d) always irrespective of the manner in which the change is brought about
Q.28
For the reactionN2 + 3H2 ⇌ 2NH3, ΔH=? .. [ CBSE PMT 1991]
  • a) ΔE + 2RT
  • b) ΔE - 2RT
  • c) ΔE + RT
  • d) ΔE - RT
Q.29
An exothermic reaction is one in which the reacting substances.. [ CPMT 1974]
  • a) Have more energy than the product
  • b) Have less energy than the products
  • c) Have the same energy as the products
  • 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]
  • a) ΔU of the reaction
  • b) ΔHof the reaction
  • c) -ΔU of the reaction
  • d) -ΔH of the reaction
0 h : 0 m : 1 s