Thermodynamics Test

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Thermodynamics Test - 74

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Weekly Quiz Competition

Question 1
1 / -0

One mole of a monoatomic gas is heated at a constant pressure of $$1atm$$ from $$0K$$ to $$100K$$. If the gas constant $$R=8.32J{mol}^{-1}{K}^{-1}$$, the change in the internal energy of the gas is approximately

A
$$2.3J$$

B
$$46J$$

C
$$8.67\times{10}^{3}J$$

D
$$1.25\times{10}^{3}J$$

Solution
Question 2
1 / -0

Ethyl chloride $$(C_{2}H_{5}Cl)$$ is prepared by:-

$$C_{2}H_{4(g)}+HCl_{(g)}\rightarrow C_{2}H_{5}Cl_{(g)};\ \ \Delta H=-72.3 kJ$$ if 98 g of $$C_{2}H_{4}$$ and 109.5 g $$HCl$$ are used at 300 K, then find $$\Delta E$$.

A
-64.8 kJ

B
-190 kJ

C
209.4 kJ

D
-209.4 kJ

Solution
Question 3
1 / -0

A gas is compressed at a constant pressure of 50 $$N/m^{ 2 }$$ from a volume of $$10m^{ 3 }$$ to a volume of $$4m^{ 3 }$$. Energy of 100 J is then added to the gas by heating. Its internal energy is

A
increased by 400 J

B
increased by 200 J

C
increased by 100 J

D
decreased by 400 J

Solution
Question 4
1 / -0

The enthaply change on freezing of $$1\ mol$$ of water at $$10^ {o}C$$ to ice at $$-10^ {o}C$$ is:

A
$$6.56\ kJ\ mol^ {-1}$$

B
$$5.81\ kJ\ mol^ {-1}$$

C
$$6.00\ kJ\ mol^ {-1}$$

D
$$5.64\ kJ\ mol^ {-1}$$
Question 5
1 / -0

Which relationship is incorrect? (for reversible isothermal process)

A
$$\Delta H=\Delta U+\Delta n_{g}$$ RT(for reaction)

B
$$\Delta G= T \Delta S$$

C
$$\Delta G^{\circ}=-2.303$$ RT log K

D
W= +2.303 nRT log $$\frac{V_{1}}{V_{2}}$$

Solution
Question 6
1 / -0

The internal energy of an ideal gas increases when it

A
Expands

B
Is compressed

C
Is first expanded and then compressed

D
None of these

Solution
Question 7
1 / -0

The amount of heat required to raise the temperature of 1 mole diatomic gas by $$1^0C$$ a constant pressure is 60 cal. The amount of heat which goes as internal energy of the gas is nearly

A
60 cal

B
30 cal

C
42.6 cal

D
49.8 cal

Solution
Question 8
1 / -0

A reaction is spontaneous at low temperature but non-spontaneous at high temperature. Which of the following is true for the reaction?

A
$$\triangle H > 0,\triangle S > 0$$

B
$$\triangle H < 0,\triangle S > 0$$

C
$$\triangle H > 0,\triangle S=0$$

D
$$\triangle H < 0,\triangle S < 0$$

E
$$\triangle H = 0,\triangle S < 0$$

Solution
Question 9
1 / -0

Energy required to dissociate, 16 g oxygen gas into free atom is x kJ. The heat of atomisation of oxygen is :-

A
x/2

B
2x

C
x

D
16
Question 10
1 / -0

In a thermodynamic process, pressure of a fixed mass of a gas is changed in such a manner that the gas molecules gives out 20 J of heat and 10 J of work is done on the gas. If the initial internal energy of the gas was 40 J, then the final internal energy will be

A
$$30 J$$

B
$$20 J$$

C
$$60 J$$

D
$$40 J$$

Solution