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Q.

Assertion(A): H2Se is less acidic than H2Te
Reason(R): H—S bond has more bond enthalpy than H-Te bond.

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a

A is a false but R is true

b

A is true but R is false

c

Both A and R a true but are is not the correct explanation of A

d

Both A and R are true are is the correct explanation of A

answer is A.

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Detailed Solution

  • H2S is less acidic than H2Te. acidity depends on H-S and H-Te bond dissociation energy higher the bond dissociation energy. Less will be acidity. 
  • On moving down the group the size of the atom increases and ionization enthalpy decreases.
  •  This helps to dissociate the bond easily. That's why H2Te is more acidic than H2S.
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Assertion(A): H2Se is less acidic than H2TeReason(R): H—S bond has more bond enthalpy than H-Te bond.