KEAM 2016 Physics and Chemistry Paper

Question : 77 of 120

Marks: +1, -0

The correct descending order of the heat liberated (in kJ ) during the neutralisation of the acids (CH3COOH(W),HF(X),HCOOH(Y) and HCN(Z) under identical conditions (Ka of CH3COOH=1.8×10−5,HCOOH=1.8×10−4 , HCN=4.9×10−10 and HF=3.2×10−4) is