chemical properties of metals

1. Aluminium is used for making cooking uten¬sils. Which of the following properties of alu¬minium 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)

The most abundant metal in the earth’s crust is

• (a) Iron

• (b) Aluminium

• (c) Calcium

• (d) Sodium

3. The poorest conductor of heat among metals is

• (a)iron

• (b) Mercury

• (c) Calcium

• (d) Sodium

Al2O3 + 2NaOH → …… + H2O

• (a) Al(OH)3

• b) Na2O

• (c) NaAlO2

• d) AlNaO2

Which of the following is the correct arrange-ment of the given metals in ascending order of their reactivity?

Zinc, Iron, Magnesium, Sodium

• (a) Iron< Zinc < Magnesium <Sodium

• (b) Sodium > Magnesium > Iron > Zinc

• (c) Sodium > Zinc > Magnesium > Iron

• (d) Sodium < Magnesium > Zinc > Iron

Which of the following oxide(s) of iron would be obtained on prolonged reaction of iron with steam?

• (a) FeO

• (b) Fe2O3

• (c) Fe3O4

• (d) Fe2O3 and Fe2O4

Example of an amphoteric oxide is:

• (a) Na2O

• (b) K2O

• (C) Al2O3

• (d) MgO

The atomic number of an element ‘X’ is 12. Which inert gas is nearest to X?

• (a) He

• (b) Ar

• (c) Ne

• (d) Kr

Which one among the following is an acidic oxide?

• (a) Na2O

• (b) CO

• (c) CO2

• (d) Al2O3

The electronic configurations of three ele¬ments X, Y and Z are X — 2, 8; Y — 2, 8, 7 and Z — 2, 8, 2. Which’of the following is correct?

• (a) X is a metal

• (b) Y is a metal

• (c) Z is a non-metal

• (d) Y is a non-metal and Z is a metal