Ionic Equlibrium Test

Result

Ionic Equlibrium Test - 7

Score
-
out of -
Rank
-
out of -

TIME Taken - -

SHARING IS CARING

If our Website helped you a little, then kindly spread our voice using Social Networks. Spread our word to your readers, friends, teachers, students & all those close ones who deserve to know what you know now.

Weekly Quiz Competition

Question 1
4 / -1

The conjugate acid of NH₂^- is

A
NH₃

B
NH₂OH

C
NH₄⁺

D
N₂H₄

Solution

Conjugate acid of a base is formed by adding H⁺ to it
NH₂^- + H⁺ → NH₃
Question 2
4 / -1

Out of the following, amphiprotic species are
I : HPO₃^2-
II OH^-
III H₂PO₄^-
IV HCO₃^-

A
I, III, IV

B
I and III

C
III and IV

D
All

Solution

Amphiprotic : can accept and Release H⁺
Only H₂PO^–₄ & HCO^–₃
Question 3
4 / -1

pH of an aqueous solution of NaCl at 85°C should be

A
7

B
> 7

C
< 7

D
0

Solution

NaCl Solution : pH is the, pH of water.

pH at 25°C <7
Question 4
4 / -1

1 c.c. of 0.1N HCl is added to 99 CC solution of NaCl. The pH of the resulting solution will be

A
7

B
3

C
4

D
1

Solution

Volume of resulting solution = 100 ml
Question 5
4 / -1

10 ml of is mixed with 40 ml of . The pH of the resulting solution is

A
1

B
2

C
2.3

D
none of these

Solution

[H⁺] = 10^–2
pH = 2.
Question 6
4 / -1

If pK_b for fluoride ion at 25°C is 10.83, the ionisation constant of hydrofluoric acid in water at this temperature is :

A
1.74 × 10^-5

B
3.52 × 10^-3

C
6.75 × 10^-4

D
5.38 × 10^-2

Solution

H+ H⁺ + F^–
pK_w = pK_a + pKb
[For conjugate Acid-Base]
⇒ pK_a = 14 – 10.87 = 3.17
K_a = 6.76 × 10^–4
Question 7
4 / -1

The pH of an aqueous solution of 1.0 M solution of a weak monoprotic acid which is 1% ionised is:

A
1

B
2

C
3

D
11

Solution

Concentration of solution =C=1M
Dissociation is α=0.01
After dissociation, the concentration of H⁺ ions will be Cα=1×0.01=10⁻²
pH=−log[H⁺]=−log(10⁻²) = +2
Question 8
4 / -1

If K₁ & K₂ be first and second ionisation constant of H₃PO₄ and K₁ >> K₂ which is incorrect.

A

B

C

D

Solution
Question 9
4 / -1

The degree of hydrolysis of a salt of weak acid and weak base in it's 0.1 M solution is found to be 50%. If the molarity of the solution is 0.2 M, the percentage hydrolysis of the salt should be

A
100%

B
50%

C
25%

D
none of these

Solution

% Hydrolysis does notdepend on the conc. in case of “Weak acid + weak base : Salt”
Question 10
4 / -1

What is the percentage hydrolysis of NaCN in N/80 solution when the dissociation constant for HCN is 1.3 × 10^-9 and K_w = 1.0 × 10^-14

A
2.48

B
5.26

C
8.2

D
9.6

Solution

Weak acid + Strong base : Salt