In the following reactions, ZnO is respectively acting as a/an :

(a)     ZnO + Na2O  →  Na2ZnO2

(b)      ZnO + CO2   →  ZnCO3

  • Option 1)

    acid and acid

     

  • Option 2)

    acid and base

     

  • Option 3)

    base and acid

     

  • Option 4)

    base and base

     

 

Answers (1)

As learned in concept

Oxidation -

It is defined as the addition of oxygen / electronegative element to a substance or removal of hydrogen / electropositive element from a substance.

- wherein

e.g. 2H_{2}S(g) + O_{2}(g)\rightarrow 2S(s)+2H_{2}O(l)

 

 

Reduction -

Removal of Oxygen / electronegative element from a substance of addition of hydrogen / electropositive element to substance.

- wherein

e.g.2HgO\overset{\bigtriangleup }{\rightarrow}2Hg(l) + O_{2}(g)

 

 Zno is an amphoteric oxide i.e it can act both as an acid as well as a base in the given reactions.

In the given reaction:

ZnO+Na_{2}O\rightarrow NaZnO_{2}

We have

ZnO+Na_{2}O\rightarrow \overset{+1}{Na_{2}}(ZnO_{2})^{-}

Clearlt Zn accepts a pair of electrons, thus acting as lewis base.

So answer is acid and base


Option 1)

acid and acid

 

This is incorrect option

Option 2)

acid and base

 

THis is a correct option

Option 3)

base and acid

 

This is incorrect option

Option 4)

base and base

 

This is incorrect option

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