Which is the correct thermal stability order for H _2 E (E = O, S, Se, Te and Po)?

NEET 2019 Chemistry question

Which is the correct thermal stability order for (E = O, S, Se, Te and Po)?

(1)
(2)
(3)Correct
(4)

Answer: (3)

Solution

On moving down group 16 the size of E increases and the E-H bond becomes longer and weaker (bond enthalpy decreases), so the thermal stability of the hydrides decreases down the group: $H_2O > H_2S > H_2Se >

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Question ID VK-092430