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JIPMER 2004
Exam
JIPMER
Year
2004
Subject
Chemistry
Chapter
s Block Elements

JIPMER 2004 · Chemistry · s Block Elements

Which of the following dissolves in hot conc. NaOH solution?

Which of the following dissolves in hot conc. NaOH solution?

Options

  1. AFe
  2. BZn
  3. CCu
  4. DAg

Correct answer

B. Zn

Step-by-step solution

Zinc is quite reactive metal. It dissolves in excess of hot NaOH to give sodium zincate. Zn+2NaOH⟶Na2ZnO2+H2↑ sodium zincate \mathrm{Zn}+2 \mathrm{NaOH} \longrightarrow \underset{\text{ sodium zincate }}{\mathrm{Na}_2 \mathrm{ZnO}_2+\mathrm{H}_2 \uparrow}
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