Q.1
All reactions with chemical dissociation are ... [ MP PMT 1990]
  • a) reversible
  • b) reversible and endothermic
  • c) exothermic
  • d) reversible or irreversible and endothermic or exothermic
Q.2
When water is added to quick lime, the reaction is .....[ MP PMT 1995]
  • a) explosive
  • b) endothermic
  • c) exothermic
  • d) photochemical
Q.3
Identify the intensive quantity from the following ... [ IIT 1993]
  • a) Enthalpy and temperature
  • b) Volume and temperature
  • c) Enthalpy and Volume
  • d) Temperature and refractive index
Q.4
In reversible isothermal process, the change in internal energy is ... [ MP PMT 1993]
  • a) zero
  • b) positive
  • c) negative
  • d) none of the above
Q.5
What is the free energy change , ΔG, when 1.0 mole of water at 100°C and 1atm pressure is converted into steam at 100°C and 1atm pressure? [ MP PMT 1998]
  • a) 540 cal
  • b) -9800 cal
  • c) +9800 cal
  • d) 0 cal
Q.6
For a spontaneous chemical process, the free energy change is ... [ BHU 1981]
  • a) Positive
  • b) Negative
  • c) Either positive or negative
  • d) Zero
Q.7
Measuring Zeta potential is useful in determining which property of colloidal solution? [ NEET 2020]
  • a) Stability of the colloidal particles
  • b) Size of the colloidal particles
  • c) Viscosity
  • d) Solubility
Q.8
For the reaction, 2Cl(g) → Cl2(g), the correct option is : ... [NEET 2020]
  • a) ΔrH <0 and ΔrS > 0
  • b) ΔrH < 0 and ΔrS < 0
  • c) ΔrH > 0 and ΔrS > 0
  • d) ΔrH > 0 and ΔrS < 0
Q.9
Under isothermal condition, a gas at 300 K expands from 0.1 L to 0.25 L against a constant external pressure of 2 bar. The work done by the gas is ... [NEET 2019] (Given that 1 L bar = 100 J)
  • a) –30 J
  • b) 5 kJ
  • c) 25 J
  • d) 30 J
Q.10
For an ideal solution, the correct option is : ... [NEET 2019]
  • a) Δmix S = 0 at constant T and P
  • b) Δmix V ≠ 0 at constant T and P
  • c) Δmix H = 0 at constant T and P
  • d) Δmix G = 0 at constant T and P
Q.11
n which case change in entropy is negative? [NEET 2019]
  • a) Evaporation of water
  • b) Expansion of a gas at constant temperature
  • c) Sublimation of solid to gas
  • d) 2H(g) → H2(g)
Q.12
Hydrolysis of sucrose is given by the following reaction. Sucrose + H2 O ⇋ Glucose + Fructose If the equilibrium constant (KC) is 2 × 1013 at 300 K, the value of ΔrGθ at the same temperature will be : .... [NEET 2020]
  • a) 8.314 J mol-11K-1 × 300 K × ln(3 × 1013)
  • b) –8.314 J mol-11K-1 ×300K × ln(4 × 1013)
  • c) –8.314 J mol-11K-1 × 300 K × ln(2 × 1013)
  • d) 8.314 J mol-11K-1 × 300 K × ln(2 × 1013)
Q.13
The bond dissociation energies of X2, Y2 and XY are in the ratio of 1 : 0·5 :ΔH for the formation of XY is – 200 kJ mol-The bond dissociation energy of X2 will be
  • a) 800 kJ mol-1
  • b) 100 kJ mol-1
  • c) 200 kJ mol-1
  • d) 400 kJ mol-1
Q.14
The standard molar heat of formation of ethane, CO2 and water(l) are respectively -21.1 , -94.1 and -68.3 kcal. The standard molar heat of combustion of ethane will be ... [ IIT 1986]
  • a) -372 kcal
  • b) 162 kcal
  • c) -240 kcal
  • d) 183. kcal
Q.15
Heat of neutralisation of strong acid by a strong base is a constant value because .. [ KCET 1984]
  • a) salt formed does not hydrolyse
  • b) only H+ and OH- ion react in every case
  • c) the strong base and strong acid react completely
  • d) the strong base and strong acid react in aqueous solution
Q.16
The decreasing order of calorific values is .. [ NCERT 1983]
  • a) C2H2 < C4H10 < C3H8 < C2H4
  • b) C2H2 < C2H4 < C3H8 < C4H10
  • c) C2H4 < C3H8< C4H10 < C2H2
  • d) C3H8 < C2H4 < C4H10< C2H2
Q.17
Enthalpy of neutralisation of HCl with NaOH is x. The heat evolved when 500ml of 2N HCl are mixed with 250ml of 4N NaOH will be... [ AFMC 2002]
  • a) 500 x
  • b) 100x
  • c) x
  • d) 10x
Q.18
The heat of combustion of rhombic and monoclinic sulphur are respectively 70960 and 71030 calories. What will be the heat of conversion or rhombic sulphur to monoclinic? [ MP PMT 1988]
  • a) 70960 calories
  • b) 71030 calories
  • c) -70 calories
  • d) +70 calories
Q.19
One mole of an ideal gas is allowed to expand reversibly and adiabatically from a temperature of 27°C. If the work done during the process is 3kJ, the final temperature will be equal to ... [ KCET 2000] (Cv=20J/K)
  • a) 450 K
  • b) 100 K
  • c) 26.85 K
  • d) 295 K
Q.20
For which reaction from the following, ΔS will be maximum? [ AIIMS 1983]
  • a) Ca(s) + ½O2(g) → CaO(s)
  • b) CaCO3(s) → CaO(s) + CO2(g)
  • c) C + O2(g) → CO2(g)
  • d) N2(g) + O2 → 2NO(g)
Q.21
The process of evaporation of a liquid is accompanied by ... [ NCERT 1983]
  • a) decrease in entropy
  • b) decrease in entropy
  • c) no change in free energy
  • d) increase in entropy
Q.22
Under the same conditions how many ml of 1M KOH and 0.5M H2SO4 solutions, respectively, when mixed to form a total volume of 100 ml. produce the highest rise in temperature? [ IIT 1993]
  • a) 67, 33
  • b) 33, 67
  • c) 40, 60
  • d) 50, 50
Q.23
ΔHcombustion of a compound is .. [ Pb.PMT 1985]
  • a) positive
  • b) negative
  • c) zero
  • d) positive or negative
Q.24
The difference between heat of reaction at constant pressure and constant volume for the reaction 2C6H6 + 15 O2 → 12CO2(g) + 6H2O(l) at 25°C in kJ is ..[IIT 1991]
  • a) -7.43
  • b) +3.72
  • c) -3.72
  • d) 7.43
Q.25
The free energy change for a reversible reaction at equilibrium is [ Pb. CET 1991]
  • a) zero
  • b) small positive
  • c) small negative
  • d) large positive
Q.26
Calculate the free energy change for the following reaction at 300K2CuO(s) → Cu2O(s) + ½O2(g)Given ΔH=145.6 kJ/molΔS=116 JK-1mol-1
  • a) 110.8 kJ/mol
  • b) 21.5 kJ/mol
  • c) 55.4 kJ/mol
  • d) 145.6 kJ/mol
Q.27
Which has maximum calorific value? [ AFMC 1988]
  • a) Fat
  • b) Protein
  • c) carbohydrate
  • d) Amino acid
Q.28
Heat of neutralisation for the reactionNaOH + HCl → NaCl + H2O is 57.1 kJ/mol. What will be the heat released when 0.25 mole of NaOH reacts with 0.25 mole of HCl? ... [ CPMT 1990]
  • a) 22.5 kJ/mol
  • b) 57.1 kJ/mol
  • c) 14.3 kJ/mol
  • d) 28.6 kJ/mol
Q.29
Which of the following statement is correct about heat of combustion? .. [ Bihar CEE 1992]
  • a) It may be exothermic in some cases and endothermic in other cases
  • b) It is applicable to gaseous substances only
  • c) it is always an exothermic reaction
  • d) Its value does not change with temperature
Q.30
Heat of transfer is the heat evolved or absorbed when a substance is converted from ... [ KCET 1984]
  • a) solid to liquid
  • b) solid to vapour
  • c) liquid to vapour
  • d) one allotropic form to another allotropic form
0 h : 0 m : 1 s