1.

The correct descending order of the heat liberated(in kJ) during the neutralisation of the acids CH_3COOH (W), HF (X), HCOOH(Y) and HCN (Z) under identical conditions is (Given K of CH_3COOH=1.8xx10^(-5) , HCOOH = 1.8xx10^(-4) , HCN =4.9xx10^(-10) and HF=3.2xx10^(-4) )

Answer»

`Y gt X gt Z gt W`
`X gt Y gt W gt Z`
`W gt X gt Y gt Z`
`Z gt W gt Y gt X`

Solution :From the `K_a` values, strength of acids is in the order: HF `gt` HCOOH `gt` `CH_3COOH` `gt` HCN
Stronger the ACID, higher is the heat liberated during the neutralisation as lesser energy is used for ionisation.
`therefore`The CORRECT order of heat liberated is
`X gt Y gt W gt Z`


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