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In acidiic medium Zn reduces nitrate ion to N H 4 + ion according to the reaction Zn   +   NO 3 − → Zn 2+   +   NH 4 +   +   H 2 O     (unbalanced) How many moles of HCl are required to reduce half a mole of N a N O 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

∴ 4 Z n + N O 3 - + 10 H + ⟶ 4 Z n 2 + + N H 4 + + 3 H 2 O (Net equation) Here H + will be obtained from HCl ∵ 1 mole of N O 3 - (0r N a N O 3 ) is reduced by =10 moles of HCl ∴ 1 2 mole of N O 3 - will be reduced by = 10 × 1 2 moles of HCl = 5 moles of HCl

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