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Q.

Which of the following has maximum thermal stability?

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a

HF

b

HCl

c

HBr

d

HI

answer is A.

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Detailed Solution

  • Among hydrogen halides, HF is the highly stable. 
  • The stability of the remaining hydrogen halides decreases in the order HBr > HCl > HI. 
  • HI is so unstable that it gets easily decomposed when exposed to heat or light. 
  • The thermal stability of hydrogen halides depends on their bond enthalpy. 
  • Higher the bond enthalpy, higher is the stability.
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