Read the following and answer any four questions from (i) to (v).

An element is a pure substance made up of same kind of atoms. At present, nearly 118 elements are known but all of them do not occur free in nature, some of them have been synthesized by artificial methods. Based on their properties, they are mainly classified as metals and non-metals. Metals are those elements which lose electrons and form positive ions i.e., they are electropositive in nature. They are generally hard, good conductors of heat and electricity, malleable, ductile and have striking luster. They have a significant role to play in our daily life.

(i) Metals which are of vital importance to the national Défense, energy and industry sector are called strategic metals. Which of the following is a strategic metal?

(a) Titanium.

(b) Zirconium.

(c) Manganese.

(d) All of these.

(ii) Which metal is the best conductor of electricity?

(a) Silver.

(b) Platinum.

(c) Nickel.

(d) Iron.

(iii) Which of the following metals is not a coinage metal?

(a) Copper.

(b) Silver.

(c) Iron.

(d) Gold.

(iv) Which of the following are the most malleable metals?

1. Sodium.
2. Gold.

III. Potassium.

1. Silver.

(a) (I) and (IV)

(b) (II) and (III)

(c) (III) and (IV)

(d) (II) and (IV)

(v) Identify the correct statement(s).

1. The wires that carry current in our homes have a coating of PVC or a rubber like material.
2. School bells are made of metals.

III. Metals do not conduct electricity.

1. Metals which produce a sound on striking a hard surface are said to be non-sonorous.

(a) (I) and (III)

(b) (I) and (II)

(c) (III) and (IV)

(d) Only (II)