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p -Block elements - ll — Chemistry STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 ScienceChemistryp -Block elements - ll1 Mark
MCQ
Nitrogen dioxide cannot be prepared by heating
  • ✓
    $KNO_3$
  • B
    $AgNO_3$
  • C
    $Pb(NO_3)_2$
  • D
    $Cu(NO_3)_2$
✓

Answer

Correct option: A.
$KNO_3$
a
Nitrogen dioxide cannot be obtained by heating $KNO _3$. The decomposition reactions are as follows:

A) $4 KNO _3 \rightarrow 2 K _2 O +2 N _2+5 O _2$

B) $2 Pb \left( NO _3\right)_2 \rightarrow 2 PbO +4 NO _2+ O _2$

C) $2 Cu \left( NO _3\right)_2 \rightarrow 2 CuO +4 NO _2+ O _2$

D) $2 AgNO _3 \rightarrow 2 Ag + O _2+2 NO _2$

Except $KNO _3$, we see that all others give $NO _2$.

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