MCQ
What happen when methane react with conc.$HNO_3$ at high temperature ?
- ✓Nitromethane is formed
- BNitromethane is formed
- C$CO_2$ and $H_2O$ are formed
- D$CO$ and $H_2O$ are formed
$CH _4+ HNO _3 \underset{400^{\circ} C }{\stackrel{\Delta}{\longrightarrow}} \underset{\text { (Nitromethane) }}{ CH _3 NO _2}+ H _2 O$
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${C_{10}}{H_{22}} \xrightarrow{900\,K} {C_4}{H_8} + {C_6}{H_{14}}$
Assertion $(A):$ The ionic radii of $O ^{2-}$ and $Mg ^{2+}$ are same.
Reason $( R )$ : Both $O ^{2-}$ and $Mg ^{2+}$ are isoelectronic species.
In the light of the above statements, choose the correct answer from the options given below


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$D$-Erythrose and its isomers are listed as $P , Q , R$, and $S$ in Column-$I$. Choose the correct relationship of $P , Q , R$, and $S$ with D-erythrose from Column $II$.
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