Equilibrium Test

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Equilibrium Test - 65

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Weekly Quiz Competition

Question 1
1 / -0

For the reaction $$PCl_{5}(g) \longrightarrow PCl_{3}(g)+Cl_{2}(g)$$

The forward reaction at constant tempearture is favoured by ___________________.

A
introducing an inert gas at constant volume

B
introducing chlorine gas at constant volume

C
introducing an inert gas at constant pressure

D
introducing $$PCl_5$$ at constant volume

Solution
Question 2
1 / -0

The total number of different kind of buffer obtained during the titration of $${ H }_{ 3 }{ PO }_{ 4 }$$ with NaOH are:-

A
3

B
1

C
2

D
0

Solution
Question 3
1 / -0

Select the correct acid-base equilibrium.

A
$$\mathrm { HNO } _ { 3 } + \mathrm { HF } \rightleftharpoons \mathrm { H } _ { 2 } \mathrm { NO } _ { 3 } ^ { + } + \mathrm { F } ^ { - }$$

B
$$\mathrm { HNO } _ { 3 } + \mathrm { HF } \rightleftharpoons \mathrm { H } _ { 2 } \mathrm { F } ^ { + } + \mathrm { NO } _ { 3 } ^ { - }$$

C
$$\mathrm { CH } _ { 3 } \mathrm { COOH } + \mathrm { NH } _ { 3 } \rightleftharpoons \mathrm { CH } _ { 3 } \mathrm { COOH } _ { 2 } ^ { + } + \mathrm { NH } _ { 2 } ^ { + }$$

D
$$\mathrm { HF } + \mathrm { H } _ { 2 } \mathrm { O } \rightleftharpoons \mathrm { H } _ { 2 } \mathrm { F } ^ { + } + \mathrm { OH } ^ { - }$$

Solution
Question 4
1 / -0

$$HCOOH$$ and $$CH_3COOH$$ solutions have equal $$pH$$. If $$\cfrac{K_1}{K_2}$$ (ratio of ionisation constants of acids) is 4, their molar concentration ratio will be:

A
2

B
0.5

C
4

D
0.25
Question 5
1 / -0

At $$90 ^ { \circ } C ,$$ pure water has $$\left[ \mathrm { H } _ { 3 } \mathrm { O } ^ { + } \right] = 10 ^ { - 6 } \mathrm { mol }$$ litre $$^ { - 1 } .$$ The value of $$K _ { w }$$ at $$90 ^ { \circ } \mathrm { C }$$ is:

A
$$10 ^ { - 6 }$$

B
$$10 ^ { - 12 }$$

C
$$10 ^ { - 14 }$$

D
$$10 ^ { - 8 }$$

Solution
Question 6
1 / -0

Which of the following salt solution will act as a buffer?

A
$${CH}_{3} {COONH}_{4}({aq.})
$$

B
$$
{NH}_{4} {Cl}({aq} .)
$$

C
$$
{CH}_{3} {COONa}({aq} .)
$$

D
$$ NaCl ({aq.}) $$
Question 7
1 / -0

What will be the effect on the equilibrium constant on increasing temperature, if the reaction neither absorbs heat nor releases heat?

A
Equilibrium constant will remain constant.

B
Equilibrium constant will decrease.

C
Equilibrium constant will increase.

D
Can not be predicted.

Solution
Question 8
1 / -0

Hydrogen ion concentration of an aqueous solution is $$1 \times 10^{-4}M$$. The solution is diluted with equal volume of water. Hydroxyl ion concentration of the resultant solution in terms of mol $$dm^{-3}$$ is __________.

A
$$1 \times 10^{-8}$$

B
$$1 \times 10^{-6}$$

C
$$2 \times 10^{-10}$$

D
$$0.5 \times 10^{-10}$$

Solution

$$\text{Concentration of aqueous solution=} 10^{−4}M$$
$$\text{If we add equal volume, let say V of water. The final volume of solution will be 2V. The new concentration is}$$
$$⇒M_1V_1=M_2V_2$$

$$⇒10^{−4}M×V=M_2×2V$$

$$⇒M_2=5×10−5M ⟶ \text{New concentration of }[H^+] .$$

$$pH=−log[H^+]=−log[5×10^{−5}]$$

$$⇒pH=4.3$$

$$⇒pOH=14−pH=9.69$$

$$⇒−log[OH^-]=9.69$$

$$⇒[OH^-]=10^{−9.69}=2×10^{−10}$$

$$\text{Thus the concentration of }[OH^-] \ is\ 2×10^{−10}M .$$
Question 9
1 / -0

The dissociation constants for acetic acid and HCN at $$25^{0}$$C are $$1 . 5 \times 10^{-5}$$ and $$4 . 5 \times 10 ^{-10} $$, respectively. The equilibrium constant for the equilibrium $$CN^{-} + CH_{3}COOH \leftrightharpoons HCN + CH_{3}COO^{-}$$ would be :

A
$$3\times10^{4}$$

B
$$3\times10^{5}$$

C
$$3\times10^{-5}$$

D
$$3\times10^{-4}$$

Solution
Question 10
1 / -0

$$N_{2} + 3 H_{2} \leftrightharpoons 2NH_{3} $$ $$\quad \Delta H= - 21 . 9 Kcal $$

The favourable conditions for given equilibrium are:

A
Low temperature , low pressure and catalyst

B
Low temperature , high pressure and catalyst

C
high temperature , low pressure and catalyst

D
high temperature , high pressure and catalyst

Solution