Question

Calcium oxide, magnesium oxide,zinc oxide, sodium oxide. Identify the odd one out and justify.

Answer 1

answer : zinc oxide , ZnO

explanation : we know, generally metal oxides are basic in nature and non- metal oxides are acidic in nature. but oxides of some metals like, Al, Zn and Sn are amphoteric in nature.

for instance,

ZnO can react with acid ; ZnO + 2HCl ⇔ZnCl2 + H2O

and ZnO also can react with base ; ZnO + 2NaOH ⇔Na2ZnO2 + H2O

so, ZnO is amphoteric while CaO , MgO and Na2O are basic in nature.

hence, Zinc oxide , ZnO is odd one .

Answer 2

Answer:

Aqueous solution of which of the following has pH more more than 7 *

1 point

Potassium bromide

Common salt

Hydrochloric acid

Calcium hydroxide