METALS AND NON METALS

The ability of metals to be drawn into thin wires is known as

• (a) ductility

• (b) malleability

• (c) sonority

• (d) conductivity

Aluminium is used for making cooking utensils. Which of the following properties of aluminium are

responsible for the same?

(i) Good thermal conductivity

(ii) Good electrical conductivity

(iii) Ductility

(iv) High melting point

• (a) (i) and (ii)

• (b) (i) and (iii)

• (c) (ii) and (iii)

• (d) (i) and (iv)

Due to its semiconductor properties the non-metal used in computer, T.V. etc. is

• (a) Carbon

• (b) Silicon

• (c) Bromine

• (d) Fluorine

What happens when calcium is treated with water?

(i) It does not react with water.

(ii) It reacts violently with water.

(iii) It reacts less violently with water.

(iv) Bubbles of hydrogen gas formed stick to the surface of calcium.

• (a) (i) and (iv)

• (b) (ii) and (iii)

• (c) (i) and (ii)

• (d) (iii) and (iv)

Generally metals react with acids to give salt and hydrogen gas. Which of the following acids does not

give hydrogen gas on reacting with metals (except Mn and Mg)?

• 
  

  $\left(a\right)\ H_{2^{ }}SO_4$

• (b) HCl

• (c) $HNO_3$

• (d) All of these

Which of the following metals are obtained by electrolysis of their chlorides in molten state?

(i) Na

(ii) Ca

(iii) Fe

(iv) Cu

• (a) (i) and (iv)

• (b) (iii) and (iv)

• (c) (i) and (iii)

• (d) (i) and (ii)

An alloy reacted with dilute hydrochloric acid to produce a gas which ‘pops’ a lighted splint. The

residue reacted with dilute nitric acid to form a blue solution. Which one of the following pairs of

metals is present in the alloy?

• (a) Copper and lead

• (b) Lead and magnesium

• (c) Copper and magnesium

• (d) Lead and zinc

Which of the following metals exist in their native state in nature?

(i) Cu

(ii) Au

(iii) Zn

(iv) Ag

• (a) (i) and (ii)

• (b) (ii) and (iii)

• (c) (ii) and (iv)

• (d) (iii) and (iv)

Metals are refined by using different methods. Which of the following metals are refined by electrolytic

refining?

(i) Au

(ii) Cu

(iii) Na

(iv) K

• (a) (i) and (ii)

• (b) (i) and (iii)

• (c) (ii) and (iii)

• (d) (iii)and (iv)

An element A is soft and can be cut with a knife. This is very reactive to air and cannot be kept in open.

It reacts vigorously with water. Identify the element from the following:

• (a) Mg

• (b) Na

• (c) P

• (d) Ca