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NEET2017ChemistryIonic EquilibriumActual

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

Options

  1. ANa ₂ CO ₃+ NaOH
  2. BNaHCO ₃+ Na ₂ CO ₃
  3. CNaHCO ₃+ NaOH
  4. DNaOH + NaCl

Correct answer

C. NaHCO ₃+ NaOH

Step-by-step solution

NaHCO ₃ is a sodium salt of weak acid, while NaOH is a strong base so, they react and cannot exist together in solution. NaHCO ₃+ NaOH Na ₂ CO ₃+ H ₂ O

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