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JEE Main 202229 JulyMorning Shift

Exam: JEE Main
Year: 2022
Date: 29 July
Shift: Morning Shift
Subject: Chemistry
Chapter: Hydrogen

JEE Main 2022 · 29 July · Morning Shift · Chemistry · Hydrogen

The reaction of zinc with excess of aqueous alkali, evolves...

The reaction of zinc with excess of aqueous alkali, evolves hydrogen gas and gives

Options

AZn{ $\left(OH\right)}_{2}$
B $ZnO$
C ${\left[Zn{\left(OH\right)}_{4}\right]}^{2 -}$
D ${\left[{ZnO}_{2}\right]}^{2 -}$

Correct answer

D. ${\left[{ZnO}_{2}\right]}^{2 -}$

Step-by-step solution

$Zn + 2NaOH \to {Na}_{2}{ZnO}_{2} + {H}_{2} ↑$
In the above reaction, Zinc reacts with Sodium Hydroxide, gives Sodium Zincate with evolving of hydrogen. Here Zn does not react as an acid in the reaction above since the reaction is not an acid-base one, but rather oxidation-reduction
${ZnO}_{2}^{2 -}$ is anhydrous form of ${\left[Zn{\left(OH\right)}_{4}\right]}^{2 -}$

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