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NTA Abhyas 2020
Exam
NTA Abhyas
Year
2020
Subject
Chemistry
Chapter
Redox Reactions

NTA Abhyas 2020 · Chemistry · Redox Reactions

In acidiic medium Zn reduces nitrate ion to NH _ 4 ^ + ion...

In acidiic medium Zn reduces nitrate ion to NH4+{NH}_{4}^{+} ion according to the reaction

\text{Zn}\text{+}{\text{NO}_{3}^{−} \to {\text{Zn}^{\text{2+}} \text{+}{\text{NH}_{4}^{+} \text{+}{H}_{2} \text{O} (unbalanced)

How many moles of HCl are required to reduce half a mole of NaNO3{NaNO}_{3} completely? Assume the availability of sufficient Zn.

Options

  1. A5
  2. B4
  3. C3
  4. D2

Correct answer

A. 5

Step-by-step solution

∴4Zn+NO3−+10H+⟶4Zn2++NH4++3H2O∴ 4Zn + {NO}_{3}^{-} + 10H^{+} ⟶ 4{Zn}^{2 +} + {NH}_{4}^{+} + 3{H}_{2}O(Net equation)
Here H+H^{+} will be obtained from HCl\text{HCl}
∵1∵ 1mole of NO3−{NO}_{3}^{-} (0r NaNO3){NaNO}_{3} ) is reduced by
=10 moles of HCl
∴12∴ \dfrac{1}{2} mole of NO3−{NO}_{3}^{-} will be reduced by
= 10×1210 \times \dfrac{1}{2} moles of HCl
= 5 moles of HCl
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