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Byju's Answer

Standard XII

Chemistry

Arrhenius Acid

Choose the co...

Question

Choose the correct from the following:
(i) Salt of a strong acid and a strong base are neutral with pH value of 7.
(ii) Salt of a strong acid and a weak base are basic with pH value more than 7.
(iii) SaIt of a weak acid and a strong base are acidic with pH value less than 7.

(i) and (ii)

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(ii) and (iii)

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(i)

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(i) and (iii)

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Solution

The correct option is C (i)
1. Salt of a strong acid and a weak base are acidic with pH value less than 7 because acid is strong which retain the pH value less then 7.
2. Salt of a weak acid and strong base are basic with pH value more than 7 because the base is strong hence pH of whole solution will be more than 7.
3. Salt of a strong acid and strong base is neutral because both are strong and cancels strong effects of each other, hence the pH will be 7.

Suggest Corrections

Similar questions

Q. Assertion :The

p H

N H_{4} C l

solution in water is less than

7

and pH of

C H_{3} C C O O N a

solution is more than

7

. Reason:

N H_{4} C l

is a salt of weak base

N H_{4} O H

and strong acid

H C l

whereas

C H_{3} C O O N a

is a salt of a weak acid

C H_{3} C O O H

and strong base

N a O H

Q. Salt hydrolysis describes the interaction of water and cation/anion or both of a salt. The pH of the solution is affected by this interaction. The cations of strong acids do not hydrolyse and therefore the solutions of salts formed by strong acids and strong bases are neutral, i.e. their pH is 7, whereas the solutions of salts formed by strong bases and weak acids are alkaline, i.e. their pH>7. While the solutions of salts formed by strong acids and weak bases are acidic i.e. pH<7.

List-I contains questions related to salt hydrolysis given above and List-II contains their answers

\begin{matrix} List - I (Salt solution) & List - II (pH) (I) 0.1 M K C N & (P) 7 (II) 0.1 M P h N H_{3} C l & (Q) 6.5+ \frac{1}{2} p K_{a} (III) 0.1 M K C l & (R) 7.5 - \frac{1}{2} p K_{b} (IV) 0.1 M C H_{3} C O O N H_{4} (K_{a} = K_{b}) & (S) 7.5 + \frac{1}{2} p K_{a} - \frac{1}{2} p K_{b} (T) 7.5 - \frac{1}{2} p K_{a} - \frac{1}{2} p K_{b} (U) 7.5 - \frac{1}{2} p K_{a} + \frac{1}{2} p K_{b} \end{matrix}

Which of the following options has the correct combination considering Lists-I and List-II?

p H

of a salt of strong base with weak acid

Q. Assertion :The pH of an acetic acid buffer solution cannot be more than 7. Reason: Acidic buffer consists of a weak acid and its salt with a strong base.

Question 05.
Sodium carbonate is a basic salt because it is a salt of
(a) strong acid and strong base
(b) weak acid and weak base
(c) strong acid and weak base
(d) weak acid and strong base

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Choose the correct from the following:(i) Salt of a strong acid and a strong base are neutral with pH value of 7.(ii) Salt of a strong acid and a weak base are basic with pH value more than 7.(iii) SaIt of a weak acid and a strong base are acidic with pH value less than 7.

Choose the correct from the following:
(i) Salt of a strong acid and a strong base are neutral with pH value of 7.
(ii) Salt of a strong acid and a weak base are basic with pH value more than 7.
(iii) SaIt of a weak acid and a strong base are acidic with pH value less than 7.