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

CBSE BoardEnglish MediumSTD 12 ScienceChemistryp -Block elements - ll1 Mark
MCQ
Assertion : When a metal is treated with conc. $HNO_3$ it generally yields a nitrate, $NO_2$
and $H_2O$.

Reason : Conc. $HNO_3$ reacts with metal and first produces a metal nitrate and nascent hydrogen. The nascent hydrogen then further reduces $HNO_3$ to $NO_2$.

  • ✓
    If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
  • B
    If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
  • C
    If the Assertion is correct but Reason is incorrect.
  • D
    If both the Assertion and Reason are incorrect.
✓

Answer

Correct option: A.
If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
a
Both assertion and reason are true and reason is the correct explanation of assertion.

$\underset{\text{(metal)}}{\mathop{M}}\,\,+\,\underset{\text{(conc}\text{.)}}{\mathop{HN{{O}_{3}}}}\,\,\to \,\underset{\text{(metal nitrate)}}{\mathop{MN{{O}_{3}}\,}}\,$ $+\,\underset{\text{(nascent hydrogen)}}{\mathop{H}}\,\,+\,2HN{{O}_{3}}\,+\,$ $\underset{\text{(nascent hydrogen)}}{\mathop{2H}}\,\,\to 2N{{O}_{2}}\,+\,2{{H}_{2}}O$

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