Can Homogeneous Mixture Have Variable Composition Justify Giving Example

(a) Can a homogeneous mixture have a variable composition ? Justify giving an example. (b) … sulphur powder heated to red hot…

Answers:

(a) Homogenous mixtures are the mixtures with uniform composition throughout like sugar solution or another. 

(b) (i) Fe + H2SO4(aq) → FeSO4 + H2

      (ii) FeS + H2SO4(aq)  →  FeSO+ H

Detailed Answer:

(a) No. Homogenous mixtures are the mixtures with uniform composition throughout like
sugar solution or another.

(b) (i) Results in the formation of ferrous sulphate and evolution of hydrogen.
Fe + H2SO4(aq) →  FeSO4 + H2
(ii) Results in the formation of iron sulphide which reacts with sulphure acid to form ferrous sulphate and release of hydrogen disulphide gas.
Fe + S → FeS
FeS + H2SO4 → FeSO4 + H2