1. Which of the following conditions holds good for an adiabatic process?
- 1) dq=α
- 2) dq>0
- 3) dq<0
- 4) dq=0
Answer: 4)
2. Which of the following properties is not a function of state?
- 1) Enthalpy
- 2) Internal energy
- 3) Concentration
- 4) Entropy
Answer: 3)
Explanation:
3. A gas expands from 10 litres to 20 litres against a constant external pressure of 10 atm.The pressure-volume work done by the system is
- 1) -10 lit atm
- 2) 10 lit atm
- 3) -100 lit atm
- 4) 100 lit atm
Answer: 3)
Explanation:
4. The enthalpy of a system is defined by the relation
- 1) PV + E - H
- 2) E = H + PV
- 3) H = E - PV
- 4) H = E+PV
Answer: 4)
Explanation:
5. ΔH = ΔE is true for the reaction
- 1) All of these
- 2) 2HI⇋ H2 +I2
- 3) 2NO⇋ N2+O2
- 4) H2 +Cl2 ⇋ 2HCl
Answer: 1)
Explanation:
6. By convention, the standard heat of formation of all elements is assumed to be
- 1) infinity
- 2) positive
- 3) negative
- 4) Zero
Answer: 4)
7. The heat of neutralisation of an acid with a base is 13.7 kcal. Which of the following is true?
- 1) A is strong and B is also strong
- 2) A is weak and B is strong
- 3) A is strong and B is weak
- 4) A is weak and B is also weak
Answer: 1)
Explanation:
8. The energy required to dissociate 6 g of gaseous hydrogen into free gaseous atoms is 3.12 kcal at 25 deg C. The bond energy of H-H bond will be
- 1) 10.04 kcal
- 2) 1.04 kcal
- 3) 1.56 kcal
- 4) 3.12 kcal
Answer: 2)
Explanation:
9. The heat of combustion of ethane is -337.0 kcal at 25 deg C. The heat of reaction when 3 g of ethane is burnt completely is
- 1) +33.7 kcal
- 2) -33.7 kcal
- 3) +3.37 kcal
- 4) -3.37 kcal
Answer: 2)
Explanation:
10. The heats of formation of CO(g) and CO2(g) are -26.4 kcal and -94.0 kcal respectively. The heat of combustion of carbon monoxide according to Hess’s law will be
- 1) -120.4 kcal
- 2) -67.6 kcal
- 3) +94.0 kcal
- 4) +26.4 kcal
Answer: 2)
Explanation:
11. A machine that can do work by using heat which flows out spontaneously from a high temperature to low temperature sink is called
- 1) Carnot machine
- 2) cyclic machine
- 3) heat machine
- 4) heat engine
Answer: 4)
12. Which of the following is true for a cyclic process?
- 1) ΔE =0
- 2) ΔE = q-w
- 3) q=w
- 4) all of these
Answer: 4)
13. The efficiency of an irreversible Carnot cycle is always_____ that of a reversible one operating between the same two temperatures
- 1) Less than
- 2) Greater than
- 3) Equal to
- 4) None of these
Answer: 1)
14. The Clausius Clapeyron equation helps to calculate
- 1) Vapour pressure at one temperature, if at another temperature is given
- 2) Boiling point or freezing point
- 3) Latent heat of vaporisation
- 4) all of the above
Answer: 4)
15. The equation for van’t Hoff isotherm is
- 1) ΔG = 2.303RT2log Kp
- 2) - ΔG = 2.303RT2log Kp
- 3) ΔG = 2.303RTlog Kp
- 4) - ΔG = 2.303RTlog Kp
Answer: 4)
