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STD 12 - p -Block elements - ll — NEET STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceNEETSTD 12 - p -Block elements - ll4 Marks
MCQ
Which is the correct thermal stablity order for $\mathrm{H}_{2} \mathrm{E}(\mathrm{E}=\mathrm{O}, \mathrm{S}, \mathrm{Se}, \text { Te and Po) } ?$
  • A
    $\mathrm{H}_{2} \mathrm{S} < \mathrm{H}_{2} \mathrm{O} < \mathrm{H}_{2} \mathrm{Se} < \mathrm{H}_{2} \mathrm{Te} < \mathrm{H}_{2} \mathrm{Po}$
  • ✓
    $\mathrm{H}_{2} \mathrm{O} < \mathrm{H}_{2} \mathrm{S} < \mathrm{H}_{2} \mathrm{Se} < \mathrm{H}_{2} \mathrm{Te} < \mathrm{H}_{2} \mathrm{Po}$
  • C
    $\mathrm{H}_{2} \mathrm{Po} < \mathrm{H}_{2} Te  < \mathrm{H}_{2} \mathrm{Se} < \mathrm{H}_{2} \mathrm{S} < \mathrm{H}_{2} \mathrm{O}$
  • D
    $\mathrm{H}_{2} \mathrm{Se} < \mathrm{H}_{2} \mathrm{Te} < \mathrm{H}_{2} \mathrm{Po} < \mathrm{H}_{2} \mathrm{O} < \mathrm{H}_{2} \mathrm{S}$
✓

Answer

Correct option: B.
$\mathrm{H}_{2} \mathrm{O} < \mathrm{H}_{2} \mathrm{S} < \mathrm{H}_{2} \mathrm{Se} < \mathrm{H}_{2} \mathrm{Te} < \mathrm{H}_{2} \mathrm{Po}$
b
$(A)$ $Pb _3 O _4$ is insoluble in water or do not react with water.

$(B)$ $2 KO _2+2 H _2 O \rightarrow 2 KOH + H _2 O _2+ O _{2( g )} \uparrow$

$(C)$ $Na _2 O _2+2 H _2 O \rightarrow 2 NaOH + H _2 O _2$

$(D)$ $Li _2 O _2+2 H _2 O \rightarrow 2 LiOH + H _2 O _2$

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