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NEET2019Paper 2019Chemistry
Q.

Which is the correct thermal stability order for H­2 E (E = O, S, Se, Te and Po)? 

  1. A

    H2 S < H2 O < H2 Se < H2 Te < H2 Po 

  2. B

    H2 O < H2 S < H2 Se < H2 Te < H2 Po 

  3. C

    H2 Po < H2 Te < H2 Se < H2 S < H2 O 

  4. D

    H2 Se < H2 Te < H2 Po < H2 O < H2 S

Solution

On going down the group thermal stability

order for H2E decreases because H–E bond

energy decreases

Order of stability would be:-

H2Po < H2Te < H2Se < H2S < H2O

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