Question

A yellow colored powdery non-metal reacts with oxygen to form a gas ‘X’. When ‘X’ is dissolved in

water, it forms a compound ‘Y’. (1+1+1)

(i) What is X and Y?

(ii) How will you test the nature (acidic / basic) of the gas X?

(iii) Write the chemical equation for the formation of product ‘Y’ from


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Answer 1

ANSWER

Elements 'X' is iron. Iron fillings burn vigorously when sprinkled on the flame. These react with sulphur to form ferrous sulphide which is a black colored compound.

Fe+S→FeS

Iron reacts with dil HCl to form ferrous chloride and hydrogen gas.

Fe+2HCl→FeCl

2

+H

2

Iron reacts with steam to form Fe

3

O

4

and hydrogen gas

3Fe+4H

2

O→Fe

3

O

4

+4H

2

So X is iron, Y is FeS and Z is Fe

3

O

4