Equilibrium Test

Result

Equilibrium Test - 68

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Weekly Quiz Competition

Question 1
1 / -0

The dissociation constant of an acid HA is $$1 \times 10 ^ { - 5 }$$. The pH of 0.1 molar solution of the acid will be approximately:

A
3

B
5

C
1

D
6

Solution
Question 2
1 / -0

The percentage of pyridine $$\left( { C }_{ 5 }{ H }_{ 5 }N \right) $$ that forms pyridinium ion $$\left( { C }_{ 5 }{ H }_{ 5 }{ N }^{ + }H \right) $$ in a 0.10 m aqueous pyridine solution $$\left( K_{ b } \ for\ { C }_{ 5 }{ H }_{ 5 }N=1.7\times { 10 }^{ -9 } \right) $$ is:

A
0.0060%

B
0.013%

C
0.77%

D
1.6%
Question 3
1 / -0

Densities of diamond and graphite are 3.5 and 2.3 gm/mL

$$C(diamond)\rightleftharpoons C(graphite);{ \triangle }_{ r }H=-1.9KJ/mol$$

Favourable condtitions for the formation of graphite are :

A
high pressure and low temperature

B
low pressure and high temperature

C
high pressure and high temperature

D
low pressure and low temperature

Solution
Question 4
1 / -0

In the reaction, $$2SO_{ 2 }(g)\rightleftharpoons 2SO +O_2$$, an inert gas introduced at constant temperature and volume. The dissociation of $$SO$$ is:

A
increased

B
decreased

C
unaffected

D
affected which cannot be predicted
Question 5
1 / -0

A weak acid react with strong base, ionisation constant of weak acid is $${ 10 }^{ -4 }$$. Find out equilibrium constant for this reaction.

A
$${ 10 }^{ -10 }$$

B
$${ 10 }^{ 10 }$$

C
$${ 10 }^{ -9}$$

D
$${ 10 }^{ 9}$$

Solution
Question 6
1 / -0

For the reaction: $$ \cfrac {1}{2} N_{2(g)} + \cfrac {1}{2} O_{2(g)} \leftrightharpoons NO_{2(g)} $$
If pressure is increased by reducing the volume of the container, then:

A
Total pressure at equilibrium will not change

B
Concentration of all component at equilibrium will change

C
Concentration of all component at equilibrium will remain same

D
Equilibrium will shift in forward direction

Solution
Question 7
1 / -0

At $$25^oC,$$ $$K_b$$ for $$BOH=1.0\times10^{-12}.$$ The concentration of hydroxyl ions in 0.01 M aqueous solution of the base would be:

A
$$1.0\times10^{-6}M$$

B
$$1 \times10^{-7}M$$

C
$$1.0\times10^{-5}M$$

D
$$2.0\times10^{-6}M$$
Question 8
1 / -0

Consider the following equilibrium.
Liquid $$\rightleftharpoons$$ Vapour
Which of the following relation is correct?

A
$$\dfrac{d ln P}{dT}=\dfrac{\Delta Hv}{RT^2}$$

B
$$\dfrac{d ln G}{dT^2}=\dfrac{\Delta Hv}{RT^2}$$

C
$$\dfrac{d ln P}{dT}=\dfrac{-\Delta Hv}{RT}$$

D
$$\dfrac{d ln P}{dT^2}=\dfrac{-\Delta Hv}{T^2}$$
Question 9
1 / -0

In the reaction: $$CO\left( g \right) +{ H }_{ 2 }O\left( g \right) \leftrightharpoons { CO }_{ 2 }\left( g \right) +{ H }_{ 2 }\left( g \right) +x\ kJ$$, the equilibrium will shift in the forward direction if:

A
temperature is increased

B
pressure is increased

C
temperature is decreased

D
pressure is decreased
Question 10
1 / -0

The self ionisation constant of $$\mathrm { NH } _ { 3 }$$ at $$50 ^ { \circ } \mathrm { C }$$ is given by $$\mathrm { K } _ { \mathrm { NH } _ { 3 } } = \left[ \mathrm { NH } _ { 4 } ^ { + } \right] \left[ \mathrm { NH } _ { 2 } ^ { - } \right] = 10 ^ { - 30 }$$. How many $$N H _ { 2 } ^ { - }$$ ions are present per $$\mathrm { cm } ^ { 3 }$$ of pure liquid $$\mathrm { NH } _ { 3 }$$?

A
$$6 \times 10 ^ { 6 }$$

B
$$6 \times 10 ^ { 5 }$$

C
$$6 \times 10 ^ { - 5 }$$

D
$$6 \times 10 ^ { - 6 }$$

Solution