Question

Choose the most appropriate answer from ( SO2 , SiO2 , Al2O3 , CO , MgO , Na2O )(a) A covalent oxide of a metalloid. (b) An oxide which when dissolved us water form acid . (c) A basic oxide (d) An amphoteric oxide

Answer 1

Answer:

A) SiO2 b) SO2 c) MgO, Na2O d) Al2O3

Explanation:

We analyze the given compounds as follows :

SO2 — SO2 is a covalent oxide. When SO2 is dissolved in water it forms an acidic solution of Sulphuric acid.

SiO2 — this is a covalent Oxide and is an Oxide of the metalloid Si.

Al2O3 — This is an ionic oxide which is amphoteric in nature. That is it has both acidic and basic properties.

CO — This is a covalent oxide.

MgO — This is a basic Oxide.

Na2O — This is a basic oxide

From this we can now answer the question as follows :

1) A covalent Oxide of a metalloid — SiO2

2) An Oxide which when dissolved in water forms an acid — SO2

3) A basic Oxide — MgO, Na2O

4) An amphoteric oxide — Al2O3

Answer 2

a)

sillicon is a metalloid . the covalent oxide is SiO2

b)acidic oxide gives acid + water - SO2

SO2  + H2O ⇒ H2O3

c)basic oxide gives base with water - Na2O

Na2O + H2O ⇒ 2NaOH

d)An  amphoteric oxide  - shows acid and basic property - Al2O3

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