Rajesh Singh, Indu Gupta and, Sikha Sharma Solutions for Chapter: Metals and Non-Metals, Exercise 2: Long Answer Type Questions

Explain the following: 

NaCl is not a conductor of electricity in solid state whereas it does conduct electricity in aqueous solution as well as in molten state. 

Explain the following:   

Iron articles are galvanised.

Explain the following: 

Metals like Na, K, Ca and Mg are never found in their free state in nature.

Given below are the steps for extraction of copper from its ore. Write the reaction involved.

(i) Roasting of copper (I) sulphide.

(ii) Reduction of copper (I) oxide with copper (I) sulphide.

(iii) Electrolytic refining.

Draw a neat and well labelled diagram for electrolytic refining of copper.

Of the three metals $\mathrm{X}, \mathrm{Y}$ and $\mathrm{Z} , \mathrm{X}$ reacts with cold water, $\mathrm{Y}$ with hot water and $\mathrm{Z}$ with steam only. Identify $\mathrm{X} , \mathrm{Y}$ and $\mathrm{Z}$ and also arrange them in order of increasing reactivity.

An element $\mathrm{A}$ burns with golden flame in air. It reacts with another element $\mathrm{B}$, atomic number $17$ to give a product $\mathrm{C}$. An aqueous solution of product $\mathrm{C}$ on electrolysis gives a compound $\mathrm{D}$ and liberates hydrogen. Identify $\mathrm{A} , \mathrm{B} , \mathrm{C}$ and $\mathrm{D}$. Also write down the equations for the reactions involved.

Two ores $\mathrm{A}$ and $\mathrm{B}$ were taken. On heating, ore $\mathrm{A}$ gives ${\mathrm{CO}}_2$ whereas, ore $\mathrm{B}$ gives ${\mathrm{SO}}_2$. What steps will you take to convert them into metals?