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The correct descending order of the heat...

The correct descending order of the heat liberated (in kJ) during the neutralisation of the acids `CH_(3)COOH ` (W) , HF (X) , HCOOH (Y) and HCN (Z) under identical conditions `K_(a) " of " CH_(3)COOH = 1.8 xx 10^(-5) , ` HCOOH = ` 1.8 xx 10^(-4) , HCN = 4.9 xx 10^(-10) and HF = 3.2 xx 10^(-4)` is

A

` Y gt X gt Z gt W`

B

`X gt Y gt W gt Z `

C

`W gt X gt Y gt Z`

D

`A gt W gt Y gt X`

Text Solution

Verified by Experts

The correct Answer is:
B
From the `K_(a)` values, strength of acids is in the order :
`HF gt HCOOH gt CH_(3)COOH gt HCN `
Stronger the acid, higher is the heat liberated during the neutralisation as lesser energy is used for ionisation.
` :. ` The correct order of heat liberated is
`X gt Y gt W gt Z` .
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