The heats of neutralisation of CH3 COOH , HCOOH , HCN and H 2 S are - 13.2, - 13.4, - 2.9 and - 3.8 kCal per equivalent respectively. Arrange the acids in increasing order of acidic strength.

Question

The heats of neutralisation of CH3 COOH , HCOOH , HCN and H 2 S are - 13.2, - 13.4, - 2.9 and - 3.8 kCal per equivalent respectively. Arrange the acids in increasing order of acidic strength. (A) HCOOH > CH 3 COOH > H 2 S > HCN (B) CH 3 COOH > HCOOH > H 2 S > HCN (C) H 2 S > HCOOH > CH 3 COOH > HCN (D) HCOOH > H 2 S > CH 3 COOH > HCN

Tardigrade Admin · Accepted Answer

The greater the (negative value) of heat of neutralisation, the more is the strength of the acid. Hence, HCOOH > CH3COOH > H2S > HCN

Q. The heats of neutralisation of $C H_{3} COO H, H COO H, H CN$ and $H_{2} S$ are - $13.2, - 13.4, - 2.9$ and - $3.8 k C a l$ per equivalent respectively. Arrange the acids in increasing order of acidic strength.

$H COO H > C H_{3} COO H > H_{2} S > H CN$

$C H_{3} COO H > H COO H > H_{2} S > H CN$

$H_{2} S > H COO H > C H_{3} COO H > H CN$

$H COO H > H_{2} S > C H_{3} COO H > H CN$

The greater the (negative value) of heat of neutralisation, the more is the strength of the acid. Hence,
$H COO H > C H_{3} COO H > H_{2} S > H CN$

Q. The heats of neutralisation of CH3​COOH,HCOOH,HCN and H2​S are - 13.2,−13.4,−2.9 and - 3.8kCal per equivalent respectively. Arrange the acids in increasing order of acidic strength.

HCOOH>CH3​COOH>H2​S>HCN

CH3​COOH>HCOOH>H2​S>HCN

H2​S>HCOOH>CH3​COOH>HCN

HCOOH>H2​S>CH3​COOH>HCN