#### 11th Standard Chemistry Thermodynamics English Medium Free Online Test One Mark Questions 2020 - 2021

11th Standard

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Chemistry

Time : 00:20:00 Hrs
Total Marks : 20

20 x 1 = 20
1. The amount of heat exchanged with surrounding at constant temperature pressure is given by the quantity

(a)

ΔE

(b)

ΔH

(c)

ΔS

(d)

ΔG

2. In an adiabatic process, which of the following is true?

(a)

q = w

(b)

q = 0

(c)

ΔE = q

(d)

PΔV= 0

3. An ideal gas expands from the volume of 1 x 10-3 m3 to 1 x 10-2 m3 at 300 K against a constant pressure at 1 x 105 Nm-2. The work done is

(a)

- 900 J

(b)

900 kJ

(c)

270 kJ

(d)

-900 kJ

4. The enthalpies of formation of Al2O3 and Cr2Oare -1596 kJ and -1134 kJ, respectively. ΔH for the reaction 2AI + Cr2O3 ⟶ 2Cr + Al2O3 is

(a)

- 1365 kJ

(b)

2730 kJ

(c)

- 2730 kJ

(d)

- 462 kJ

5. If one mole of ammonia and one mole of hydrogen chloride are mixed in a closed container to form ammonium chloride gas, then

(a)

ΔH > ΔU

(b)

ΔH - ΔU = 0

(c)

ΔH + ΔU = 0

(d)

ΔH < ΔU

6. Molar heat of vapourization of a liquid is 4.8 kJ mol-1. If the entropy change is 16 J mol -1 K-1, the boiling point of the liquid is

(a)

323 K

(b)

27° C

(c)

164 K

(d)

0.3 K

7. The values of ΔH and ΔS for a reaction are respectively 30 kJ mol-1 and 100 JK-1 mol-1. Then the temperature above which the reaction will become spontaneous is

(a)

300 K

(b)

30 K

(c)

100 K

(d)

200 C

8. The direct conversion of A $\rightarrow$ B is difficult Hence it is carried out by the following paths shown:
$\Delta$( A$\rightarrow$ C) = 50 e.u
$\Delta$(C$\rightarrow$ D) = 30 e.u
$\Delta$(B$\rightarrow$D) = 20 e.u. where e.u. is entropy unit, then $\Delta$S (A-B) is

(a)

+ 100 e.u.

(b)

+ 60 e.u

(c)

- 100 e.u

(d)

- 60 e.u.

9. ΔUΘ of combustion of methane is -X kJ mol-1. The value ΔHΘ is _____

(a)

ΔUΘ

(b)

>ΔUΘ

(c)

<ΔUΘ

(d)

0

10. A fundamental goal of thermodynamics is the ________

(a)

prediction of spontaneity of the reaction.

(b)

determination of rate of the chemical reaction

(c)

evaluation of the microscopic properties

(d)

both (b) and (c)

11. Which one of the following is an example for closed system?

(a)

Hot water contained in a thermos flask

(b)

A gas contained in a cylinder fitted with a piston

(c)

All living things

(d)

Hot water contained in a open beaker

12. For an isochoric process, _______

(a)

q=0

(b)

dp=0

(c)

dv=0

(d)

ΔU=0

13. Which of the following is not an intensive property?

(a)

Pressure

(b)

Density

(c)

Volume

(d)

Surface tension

14. Assertion (A): Spontaneous process is an irreversible process and may be reversed by some external agency.
Reason (R): Decrease in enthalpy is a contributory factor for spontaneity.

(a)

both A and R are true and R is the correct explanation of A

(b)

both A and R are true and R is not correct explanation of A

(c)

both A and R are false

(d)

A is false but R is true

15. For a cyclic process, the change in internal energy of the system is __________

(a)

always +ve

(b)

equal to zero

(c)

always -ve

(d)

none of the above

16. A thermodynamic state function is a quantity _____________

(a)

used to determine heat changes

(b)

whose value is independent of path

(c)

used to determine pressure volume work

(d)

whose value depends on temperature only

17. Match the List-I and List-II using the correct code given below the list.

 List-I List-II A. Gravitational work 1. QV B. Mechanical work 2. PV C. Electrical work 3. F.x D. Expansion work 4. mgh
(a)
 A B C D 4 3 1 2
(b)
 A B C D 3 4 2 1
(c)
 A B C D 2 4 3 1
(d)
 A B C D 2 4 3 1
18. The standard value of enthalpy of combustion of benzoic acid is ______

(a)

-3227 kJ mol-1

(b)

+3227 kJ mol-1

(c)

-32-27 kJ mol-1

(d)

+32.27 kJ mol-1

19. In which of the following entropy decreases?

(a)

melting of ice

(b)

evaporation of water

(c)

crystallization of sugar

(d)

dissolution of salt

20. Van't Hoff equation is ___________

(a)

$\triangle G^0=-\triangle H^0-T\triangle S^0$

(b)

G - H - TS

(c)

$\triangle G^0$ = -2.303 RT log Keq

(d)

$\triangle S-\triangle H/T$