Which of the following mixtures can act as a buffer?

N a O H + H C O O N a (1 : 1 m o l a r r a t i o)

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H C O O H + N a O H (2 : 1 m o l a r r a t i o)

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N H_{4} C l + N a O H (2 : 1 m o l a r r a t i o)

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H C O O H + N a O H (1 : 1 m o l a r r a t i o)

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Solution

The correct options are
B $H C O O H + N a O H (2 : 1 m o l a r r a t i o)$
C $N H_{4} C l + N a O H (2 : 1 m o l a r r a t i o)$
An acidic buffer solution consists of solution of a weak acid and its salt with strong base. E.g., $H C O O H + N a O H (2 : 1 m o l a r r a t i o)$ .
A basic buffer solution consists of a mixture of a weak base and its salt with strong acid. E.g., $N H_{4} C l + N a O H (2 : 1 m o l a r r a t i o)$ .
$H C O O H + N a O H (1 : 1 m o l a r r a t i o)$ is a weak acid-strong base salt and $N a O H + H C O O N a (1 : 1 m o l a r r a t i o)$ is a basic solution.

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Which type of reaction is this:

Na + 2H₂O -----------> Na(OH)₂+ H₂

H C l, C H_{3} C O O H a n d H C O O H

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