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BITSAT 2014
Exam
BITSAT
Year
2014
Subject
Chemistry
Chapter
Thermodynamics (C)

BITSAT 2014 · Chemistry · Thermodynamics (C)

The heats of neutralisation of CH_ 3 COOH , HCOOH, HCN and H_ 2 S...

The heats of neutralisation of CH3COOH\mathrm{CH}_{3} \mathrm{COOH}, HCOOH,HCN\mathrm{HCOOH}, \mathrm{HCN} and H2S\mathrm{H}_{2} \mathrm{ S} are -13.2,-13.4,-2.9 and −3.8kCal-3.8 \mathrm{kCal} per equivalent respectively. Arrange the acids in increasing order of acidic strength.

Options

  1. AHCOOH>CH3COOH>H2S>HCN\mathrm{HCOOH} > \mathrm{CH}_{3} \mathrm{COOH} > \mathrm{H}_{2} \mathrm{ S} > \mathrm{HCN}
  2. BCH3COOH>HCOOH>H2S>HCN\mathrm{CH}_{3} \mathrm{COOH} > \mathrm{HCOOH} > \mathrm{H}_{2} \mathrm{ S} > \mathrm{HCN}
  3. CH2S>HCOOH>CH3COOH>HCN\mathrm{H}_{2} \mathrm{ S} > \mathrm{HCOOH} > \mathrm{CH}_{3} \mathrm{COOH} > \mathrm{HCN}
  4. DHCOOH>H2S>CH3COOH>HCN\mathrm{HCOOH} > \mathrm{H}_{2} \mathrm{ S} > \mathrm{CH}_{3} \mathrm{COOH} > \mathrm{HCN}

Correct answer

A. HCOOH>CH3COOH>H2S>HCN\mathrm{HCOOH} > \mathrm{CH}_{3} \mathrm{COOH} > \mathrm{H}_{2} \mathrm{ S} > \mathrm{HCN}

Step-by-step solution

The greater the (negative value) of heat of neutralisation, the more is the strength of the acid. Hence, HCOOH\mathrm{HCOOH}>CH3COOH\mathrm{CH}_{3} \mathrm{COOH}>H2S\mathrm{H}_{2} \mathrm{ S}>HCN\mathrm{HCN}
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