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AIIMS 2017
Exam
AIIMS
Year
2017
Subject
Chemistry
Chapter
Ionic Equilibrium

AIIMS 2017 · Chemistry · Ionic Equilibrium

ZnO is white when cold and yellow when heated. It is due to the...

ZnO\mathrm{ZnO} is white when cold and yellow when heated. It is due to the development of

Options

  1. ANa2CO3+NaOH\mathrm{Na}_2 \mathrm{CO}_3+\mathrm{NaOH}
  2. BNaHCO3+Na2CO3\mathrm{NaHCO}_3+\mathrm{Na}_2 \mathrm{CO}_3
  3. CNaHCO3+NaOH\mathrm{NaHCO}_3+\mathrm{NaOH}
  4. DNaOH+NaCl\mathrm{NaOH}+\mathrm{NaCl}

Correct answer

C. NaHCO3+NaOH\mathrm{NaHCO}_3+\mathrm{NaOH}

Step-by-step solution

NaHCO3\mathrm{NaHCO}_3 is a sodium salt of weak acid, while NaOH\mathrm{NaOH} is a strong base so, they react and cannot exist together in solution. NaHCO3+NaOH⟶Na2CO3+H2O\mathrm{NaHCO}_3+\mathrm{NaOH} \longrightarrow \mathrm{Na}_2 \mathrm{CO}_3+\mathrm{H}_2 \mathrm{O}
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