Thermodynamics Test

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Thermodynamics Test - 78

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Weekly Quiz Competition

Question 1
1 / -0

A solution of $$500\ ml$$ of $$2\ M-KOH$$ is added to $$500\ ml$$ of $$2\ M-HCl$$ and the mixture is well shaken. The rise in temperature $$T_{1}$$ is noted. The experiment is again performed using $$250\ ml$$ of each solution and rise in temperature $$T_{2}$$ is again noted. Which of the following is correct?

A
$$T_{1}=T_{2}$$

B
$$T_{1}$$ is $$2$$ times as larger as $$T_{2}$$

C
$$T_{2}$$ is twice larger as $$T_{1}$$

D
$$T_{1}$$ is $$1.5$$ times as larger as $$T_{2}$$
Question 2
1 / -0

The standard heat of combustion of propane is $$-2220.1\ kJ/mol$$. The standard heat of vaporization of liquid water is $$44\ kJ/mol$$. What is the $$\triangle H^{o}$$ of the reaction :
$$C_{3} H_{8} (g)+ 5O_{2} (g) \rightarrow 3CO_{2} (g) + 4H_{2} O (g)$$?

A
$$-2220.1\ kJ$$

B
$$-2044.1\ kJ$$

C
$$-2396.1\ kJ$$

D
$$-2176.1\ kJ$$

Solution
Question 3
1 / -0

For a specific work, on an average a person requires $$5616\ kJ$$ of energy. How many kilogram of glucose must be consumed if all the require energy has to be derive from glucose only? $$\Delta H$$ for combustion of glucose is $$-2808\ kJ\ mol^{-1}$$

A
$$0.720\ kg$$

B
$$0.36\ kg$$

C
$$0.18\ kg$$

D
$$1.0\ kg$$

Solution
Question 4
1 / -0

The value of $$\triangle H_{sol}$$ of anhydrous copper $$(II)$$ sulfate is $$-66.11\ kJ.$$ Dissolution of $$1$$ mole of blue vitriol (Copper $$(II)$$ sulphate pentahydrate) is followed by absorption of $$11.5\ kJ$$ of heat. The enthalpy of dehydration of blue vitriol is:

A
$$-77.61\ kJ$$

B
$$+77.61\ kJ$$

C
$$-54.61\ kJ$$

D
$$+54.61\ kJ$$

Solution
Question 5
1 / -0

The data below refers to gas phase reaction at constant pressure at $$25^{o}C.$$
$$CH_{3}- CH_{3} \Rightarrow CH_{3}- CH_{2}+ H; \triangle H_{1} = +420\ kJ\ mol^{-1}$$
$$CH_{3}- CH_{2} \rightarrow CH_{2} = CH_{2}+ H; \triangle H_{2}+ 168\ kJ\ mol^{-1}$$
From these data, the enthalpy change $$\triangle H$$ for the reaction : $$2CH_{3} - CH_{2} \rightarrow CH_{3}- CH_{3}+ CH_{2} = CH_{2}$$ is

A
$$+250\ kJ$$

B
$$+588\ kJ$$

C
$$-252\ kJ$$

D
$$-588\ kJ$$

Solution
Question 6
1 / -0

Geological condition are sometimes so extreme that quantities neglected in normal laboratory experiments take on an overriding importance. For example, consider the formation of diamond under geophysically typical conditions. The density of graphite is $$2.4\ g/cm^{3}$$ and that of diamond is $$3.6\ g/cm^{3}$$ at a certain temperature and $$500\ kbar$$. By how much does $$\Delta U_{trans}$$ differes from $$\Delta H_{trans}$$ for the graphite to diamond transition?

A
$$83.33\ kJ/mol$$

B
$$0.83\ kJ/mol$$

C
$$8.33\times 10^{7}\ kJ/mol$$

D
$$83.33\ J/mol$$

Solution
Question 7
1 / -0

The standard enthalpies of formation of $$H_{2}O (l), Li^{+}(aq)$$ and $$OH^{-} (aq)$$ are $$-285.8, -278.5$$ and $$-228.9\ kJ/mol$$, respectively. The standard enthalpy change for the reaction is:

$$2Li(s)+ 2H_{2}O (l) \rightarrow 2Li^{+} (aq) + 2OH^{-} (aq)+ H_{2} (g)$$

A
$$+443.2\ k J$$

B
$$-443.2\ kJ$$

C
$$-221.6 \ kJ$$

D
$$+221.6\ kJ$$
Question 8
1 / -0

A quantity that cannot be directly measured is:

A
heat of formation of $$H_{2}O(l)$$

B
heat of formation of $$CH_{4}(g)$$

C
latent heat of fusion of ice

D
heat of combustion of ethyl alcohol
Question 9
1 / -0

Enthalpy of neutralization of oxalic acid is $$-25.4\ kcal/mol$$ using strong base, $$NaOH$$. Enthalpy change for the process:
$$H_{2}C_{2}O_{4}(aq)\rightarrow 2H^{+}(aq)+C_{2}O_{4}^{2-}(aq)$$ is about

A
$$2.0\ kcal$$

B
$$-11.7\ kcal$$

C
$$1.0\ kcal$$

D
$$4.0\ kcal$$

Solution
Question 10
1 / -0

For a spontaneous process:

A
enthalpy change of the system must be negative

B
entropy change of the system must be positive

C
entropy change of the surrounding must be positive

D
entropy change of the system plus surrounding must be positive

Solution

For a spontaneous process the randomness of the molecules in the system increases so the entropy change of the system and surroundings must be positive.
Hence option B is correct.