Question

Specify whether the following material can be used as a replacement to electric switch.

Rubber, Water, Plastic Pin, Safety Pin, Lemon, Wood, Wool, Cotton, Glass Bangle, Iron Nail,

Metal Key, Plastic Scale
​Please fast
no explanation needed direct answers

Answer 1

Answer:

An iron nail is kept in each of the following liquids. In which case would it lose its shine and appear dull?

(a) Mustard oil

(b) Soft drink

(c) Coconut oil

(d) Kerosene

Solution:

(b) An iron nail kept in soft drink would lose its shine and appear dull became soft drink contains carbonic acid which reacts with iron nail, so it gives dull appearance.

Iron nail has no reaction with mustard oil, coconut oil and kerosene, so does not lose its shine, when kept in these solutions.