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Mark the appropriate choice to fill up the blanks in the given paragraph.
A solution which maintains constant pH when small amounts of acid or base are added is known as a `ul((i))`. A mixture of acetic acid and sodium acetate acts as `ul((ii))` with a pH around `ul((iii))` and a mixture of ammonium chloride and ammonium hydroxide acts as `ul((iv))` with a pH around `ul((v))`

A

`{:((i),(ii),(iii),(iv),(v),),("buffer capacity","basic buffer",9.25,"acidic buffer",4.75,):}`

B

`{:((i),(ii),(iii),(iv),(v),),("buffer solution","acidic buffer",9.25,"basic buffer",4.75,):}`

C

`{:((i),(ii),(iii),(iv),(v),),("buffer solution","basic buffer",4.75,"acidic buffer",9.25,):}`

D

`{:((i),(ii),(iii),(iv),(v),),("buffer solution","acidic buffer",4.75,"basic buffer",9.25,):}`

Text Solution

Verified by Experts

The correct Answer is:
D
Acidic buffer has a pH of around 4.75 and basic buffer has a pH around 9.25.
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Asseration : A solution containing a mixture of acetic acid and sodium acetate maintains a constant value of ph on addition of small amounts of acid or alkali. Reason : A solution containing a mixture of acetic acid and sodium acetate acts as a buffer solution around ph 4.75.

Assertion : Buffer solutions are those which resist change in pH value on the addition of a small amount of acid or a base to it. Reason: Mixture of NH_4OH and NH_4 Cl acts as basic buffer.

Assertion (A ) : A buffer solution has a capacity to resist the change in pH value on addition is small amount of acid or base to it. Reason (R ) : An aqueous solution of ammonium acetate can act as a buffer.

Name the acid and base from which the following salts have been formed : (i) Sodium acetate (ii) Ammonium chloride (iii) Calcium nitrate (iv) Sodium carbonate.

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