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BITSAT2014ChemistryThermodynamics (C)Actual

The heats of neutralisation of CH ₃ 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.

Options

  1. AHCOOH > CH ₃ COOH > H ₂ ~S > HCN
  2. BCH ₃ COOH > HCOOH > H ₂ ~S > HCN
  3. CH ₂ ~S > HCOOH > CH ₃ COOH > HCN
  4. DHCOOH > H ₂ ~S > CH ₃ COOH > HCN

Correct answer

A. HCOOH > CH ₃ COOH > H ₂ ~S > HCN

Step-by-step solution

The greater the (negative value) of heat of neutralisation, the more is the strength of the acid. Hence, HCOOH > CH ₃ COOH > H ₂ ~S > HCN

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