Lakhmir Singh and Manjit Kaur Solutions for Chapter: Materials: Metals and Non-Metals, Exercise 5: Questions Based on High Order Thinking Skills (HOTS)

Which of the following reactions will not occur? Why not? 

(a)$\underset{\left(\mathrm{solution}\right)}{\mathrm{Zinc} \mathrm{sulphate}}+\mathrm{Copper}\to \underset{\left(\mathrm{solution}\right)}{\mathrm{Copper} \mathrm{sulphate}}+\mathrm{Zinc}$

(b) $\underset{\left(\mathrm{solution}\right)}{\mathrm{Copper} \mathrm{sulphate}}+\mathrm{Iron}\to \underset{\left(\mathrm{solution}\right)}{\mathrm{Iron} \mathrm{sulphate}}+\mathrm{Copper}$

One day Reeta went to a jeweller's shop with her mother. Her mother gave an old gold jewellery to goldsmith to polish. Next day when they brought the jewellery back, they found that there was a slight loss in its weight. Can you suggest a reason for the loss in weight? 

An element burns in air to form an oxide. The aqueous solution of this oxide turns blue litmus paper red. State whether the element is a metal or a non-metal. Name one such element. 

An element burns in air to form an oxide. The aqueous solution of this oxide turns turmeric paper red. State whether the element is a metal or non-metal. Name one such element. 

The metal $\mathrm{X}$ reacts with dilute hydrochloric acid to form a gas $\mathrm{Y}$. The metal $\mathrm{X}$ also reacts with sodium hydroxide solution (on heating) to form the same gas $\mathrm{Y}$. When a lighted matchstick is applied, this gas burns by producing a 'pop' sound. 
(a) Name two metals which could behave like $\mathrm{X}$. 
(b) Name the gas $\mathrm{Y}$.