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MHT CET Medical202621 April 2026Morning ShiftChemistryClassification of Elements and Periodicity in PropertiesActual

The hydride with lowest acid strength among the following is

Options

  1. AH ₂ Se
  2. BH ₂ Te
  3. CH ₂ O
  4. DH ₂ S

Correct answer

C. H ₂ O

Step-by-step solution

The given compounds are hydrides of Group 16 elements. As we move down the group, the atomic size of the central atom increases. This causes the bond length of the E-H bond (where E is the Group 16 element) to increase and the bond dissociation enthalpy to decrease. Consequently, the tendency to release an H^+ ion increases down the group, leading to an increase in acidic strength. The order of acidic strength of Group 16 hydrides is H₂O Therefore, H₂O has the lowest acid strength. Answer: H ₂ O

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