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Which of the following mixtures can act ...

Which of the following mixtures can act as buffer?

A

`H_2CO_3 +KOH (2.5 : 1 `molar ratio)

B

`H_2 CO_3 +KOH (2:3` molar ratio)

C

`NH_4 OH+ HNO_3 ( 6: 4` molar ratio)

D

`NH_4 OH+ HNO_3 (3: 5 ` molar ratio )

Text Solution

Verified by Experts

The correct Answer is:
A, B, C
` H_2CO_3 +KOH ` react in 1 : 2 ratio for complete neutralization
` therefore a,b ` are buffer due to incomplete neutralization `NH_4OH+ HNO_3` react in 1 : 1 ratio for complete neutralization
in d, acid in excess ` therefore ` not a buffer
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