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JEE · NEET Previous Year Question

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

Topic: NEET PYQ

Answer: D. Full step-by-step solution below.

  1. ASe < Te < Po < O < S
  2. BS < O < Se < Te < Po
  3. CO < S < Se < Te < Po
  4. DPo < Te < Se < S < O

Correct answer: D

Solution

(d) In oxygen family down the group thermal stability decreses
order of thermal stability
O > S > Se > T > Po]
This is because M–H bond dissociation energy decreases down the group with the increase in the size of central atom

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