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Which one of the following is an amphoteric oxide?

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asked Mar 31, 2018 in Chemistry by paayal (26,720 points) ● 4 ● 6 ● 46

Which one of the following is an amphoteric oxide?

(a) ZnO 

(b) Na2O

(c) SO2 

(d) B2O3 .

1 Answer

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answered Mar 31, 2018 by sanjaydas (61,430 points) ● 5 ● 7 ● 7
selected Apr 1, 2018 by Vikash Kumar
 
Best answer

(a) : ZnO is an amphoteric oxide and dissolves readily in acids forming corresponding zinc salts and alkalies forming zincates.
ZnO + H2SO4 → ZnSO4 + H2O
zinc sulphate
ZnO + 2NaOH → Na2 ZnO2 + H2O
sodium zincate

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