Ionic Equilibrium(11th And 12th > Chemistry ) Questions and answers for exam Preparation

11th And 12th > Chemistry

IONIC EQUILIBRIUM MCQs

Total Questions : 30 | Page 1 of 3 pages

Question 1.

Which of the following is the strongest acid ?

$H_{2} S O_{3}$
$H_{2} S O_{4}$
$H C l O_{4}$
$H_{3} P O_{4}$

Discuss Question

Answer: Option C. ->

H C l O_{4}

:
C

It is a $H C l O_{4}$

Question 2.

Which of the following is the strongest conjugate base

$C l^{-}$
$C H_{3} C O O^{-}$
$S O_{4}^{2 -}$
$N O_{2}^{-}$

Discuss Question

Answer: Option B. ->

C H_{3} C O O^{-}

:
B

Because it is conjugate base of weak acid.

$C H_{3} C O O H ⇌ C H_{3} C O O^{-} + H^{+}$

Question 3.

$N a O H$ is a strong base because

It gives $O H^{-}$ ion.
It can be oxidised
It can be easily ionised
It provides $H_{3} O^{+}$ ions.

Discuss Question

Answer: Option A. -> It gives

O H^{-}

ion.
:
A

$N a O H$ completely dissociates to give $N a^{+}$ and $O H^{-}$ ions in water. Hence it is considered as a Strong base.

Question 4.

Review the equilibrium and choose the correct statement

$H C l O_{4} + H_{2} O ⇌ H_{3} O^{+} + C l O_{4}^{-}$

$H C l O_{4}$ is the conjugate acid of $H_{2} O$
$H_{3} O^{+}$ is the conjugate base of $H_{2} O$
$H_{2} O$ is the conjugate acid of $H_{3} O^{+}$
$C l O_{4}^{-}$ is the conjugate base of $H C l O_{4}$

Discuss Question

Answer: Option D. ->

C l O_{4}^{-}

is the conjugate base of

H C l O_{4}

:
D

$H C l O_{4} + H_{2} O ⇌ H_{3} O^{+} + C l O_{4}^{-}$

Here $H C l O_{4}$ and $C l O_{4}^{-}$ constitute conjugate acid and base pair.

Question 5.

Lewis acid

necessarily has H atoms.
Is a electron pair donor
Is always a proton donor
Is a electron pair acceptor

Discuss Question

Answer: Option D. -> Is a electron pair acceptor
:
D

Lewis acids accept electron pairs

Question 6.

A white substance having alkaline nature in solution is

$N a N O_{3}$
$N H_{4} C l$
$N a_{2} C O_{3}$
$F e_{2} O_{3}$

Discuss Question

Answer: Option C. ->

N a_{2} C O_{3}

:
C

$N a_{2} C O_{3} + 2 H_{2} O ⇌ 2 N a O H + H_{2} C O_{3}$

Question 7.

Ammonium hydroxide is a weak base because

It has low vapour pressure
It is only slightly ionized
It is not a hydroxide of any metal
It has low density

Discuss Question

Answer: Option B. -> It is only slightly ionized
:
B

It is a weak electrolyte since slightly ionized.

Question 8.

Equal volumes of 10% $\frac{v}{v}$ of HCl is mixed with 10% $\frac{v}{v}$ NaOH solution. If density pure NaOH is 1.5 times that of pure HCl then the resultant solution be

Basic
Neutral
Acidic
Can't be predicted

Discuss Question

Answer: Option A. -> Basic
:
A

HCl = d

NaOH = 1.5 d

HCl in 10 ml of it = $\frac{10 d}{36.5}$

NaOH in 10 ml of it = $\frac{10 \times 1.5 d}{40}$ = $\frac{15 d}{40}$

NaOH> HCl

Question 9.

Which of the following is not a Lewis acid

$C O$
$S i C l_{4}$
$S O_{3}$
$Z n^{2 +}$

Discuss Question

Answer: Option A. ->

C O

:
A

CO doesn't have a vacant d-orbital.

Question 10.

If $α$ is the degree of ionization, $C$ the concentration of a weak electrolyte and $K_{a}$ the acid ionization constant, then the correct relationship between $α$ , C and $K_{a}$ is