Question

Observe the given reaction carefully and fill in the blanks by choosing an appropriate option.
$F{e}_{\left(s\right)}+CuS{O}_4\to FeS{O}_{4\left(aq\right)}+C{u}_{\left(s\right)}$
Before reaction, iron is ___(i)___ in colour and solution is ___(ii)___ in colour. After reaction iron gets ___(iii)___ deposits and the solution becomes ___(iv)___ in colour.

• A. (i) - Grey, (ii) - Colourless, (iii) - Red, (iv) - Blue
• B. (i) - Red, (ii) - Blue, (iii) - Grey, (iv) - Green
• C. (i) - Grey, (ii) - Blue, (iii) - Brown, (iv) - Green
• D. (i) - Red, (ii) - Colourless, (iii) - Grey, (iv) - Green

Answer 1

The correct option is C (i) - Grey, (ii) - Blue, (iii) - Brown, (iv) - Green

In test tube P, iron nails do not rust because boiled water does not contain any oxygen. A thin layer of oil also prevents oxygen from reaching the water in the test tube. In the test tube Q, iron nails do not trust because soda lime absorbs water vapours. In test tube R, iron nails will rust because water and oxygen both are available.