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NEET 2019
Exam
NEET
Year
2019
Subject
Chemistry
Chapter
p Block Elements (Group 15, 16, 17 & 18)

NEET 2019 · Chemistry · p Block Elements (Group 15, 16, 17 & 18)

Which is the correct thermal stability order for H _ 2 E(E = O, S,...

Which is the correct thermal stability order for H2E(E=O,S,Se,TeandPo)?{H}_{2}E\left(E = O, S, Se, TeandPo\right) ?

Options

  1. AH2S<H2O<H2Se<H2Te<H2Po{H}_{2}S < {H}_{2}O < {H}_{2}Se < {H}_{2}Te < {H}_{2}Po
  2. BH2O<H2S<H2Se<H2Te<H2Po{H}_{2}O < {H}_{2}S < {H}_{2}Se < {H}_{2}Te < {H}_{2}Po
  3. CH2Po<H2Te<H2Se<H2S<H2O{H}_{2}Po < {H}_{2}Te < {H}_{2}Se < {H}_{2}S < {H}_{2}O
  4. DH2Se<H2Te<H2Po<H2O<H2S{H}_{2}Se < {H}_{2}Te < {H}_{2}Po < {H}_{2}O < {H}_{2}S

Correct answer

C. H2Po<H2Te<H2Se<H2S<H2O{H}_{2}Po < {H}_{2}Te < {H}_{2}Se < {H}_{2}S < {H}_{2}O

Step-by-step solution

Thermal stability of H2E{H}_{2}E decreases with the decrease in bond dissociation enthalpy of (H−E)\left(H - E\right) bond down the group.

H2O>H2S>H2Se>H2Te>H2Po{H}_{2}O > {H}_{2}S > {H}_{2}Se > {H}_{2}Te > {H}_{2}Po

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