Question

A student placed a clean iron nail in blue coloured copper sulphate solution for a considerable time. He observes that (1) iron nail gets green coating
(2) iron nail gets brown coating
(3) iron nail gets no coating
(4) iron nail gets blue coating

Answer 1

Answer:

(2) Iron nail get Brown coating..

this coating is of metal, copper over it

Answer 2

A student placed a clean iron nail in blue coloured copper sulphate solution for a considerable time. He observes that iron nail gets no coating .

Explanation:

• The addition of carbon disulfide to a mix containing iron filings and sulfur powder leads to the creation of a light yellow solution when the sulfur powder dissolves in carbon disulfide with gentle stirring.
• Since iron fillings are insoluble, they stick to the basement. These can be isolated by filtration.
• When the solution is permitted to evaporate, the solid sulfur powder is achieved.
• Therefore option 3) iron nail gets no coating is the correct answer.