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JEE Advanced levelSingle correct optionDifficulty 3 of 3pb220

Which pair correctly gives the main products of (I) tin with hot concentrated $HNO X_{3}$ and (II) lead with dilute $HNO X_{3}$ ?

AI: hydrated $SnO X_{2}$ and $NO$ ; II: $PbO X_{2}$ and $H X_{2}$
BI: $Sn (NO X_{3}) X_{2}$ and $H X_{2}$ ; II: $PbO X_{2}$ and $NO X_{2}$
CI: $Sn (NO X_{3}) X_{4}$ and $NO X_{2}$ ; II: $Pb (NO X_{3}) X_{4}$ and $NO$
DI: hydrated $SnO X_{2}$ and $NO X_{2}$ ; II: $Pb (NO X_{3}) X_{2}$ and $NO$

Answer: D

Hot concentrated nitric acid oxidises tin to the +4 state, which hydrolyses to hydrated

SnO X_{2}

(metastannic acid) with

NO X_{2}

evolved. Lead is oxidised only to the stable +2 state by dilute acid:

3 Pb + 8 HNO X_{3} 3 Pb (NO X_{3}) X_{2} + 2 NO + 4 H X_{2} O

.

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