Question

1. (a) State four important properties of
metals.
(b) Write the symbols of following metals :
viy magnesium (ii) potassium
(iii) iron
(iv) lead
(v) silver
(vi) sodium
2. (a) State four important properties of
non-metals.​

Answer 1

Answer:

a). hard

bretal into thin sheet

malleable .

m.p and boiling points are high

b). Mg, k , Fe , pb, Ag , Na , respectively

b). generally form covelent bonds

m.p. and b.p. are low .

Answer 2

Explanation

1)(a)

Physical properties

• Metal are ductile and malleable.
• Metal are sonorous
• They are hard substance
• They are shinny in appearance

Chemical properties

• metals when reacts with acid gives salt of the corresponding metal and H2 gas is released

Metal + Acid ---> salt +H2

• metals when reacts with oxygen gives metal oxide , basic in Nature

Metal + Oxygen----> Metal oxide (basic)

• metal when reacts with Carbonates gives metallic salt and CO2 release

Metal + Carbonate ---->metallic salt + CO2

• Metal when reacts with water gives metal oxide and hydrogen gas and further gives metal hydroxide

Metal + water --->Metal oxide + H2

metal oxide + water -----> metal hydroxide

(b)

Magnesium (Mg)

Potassium (k)

Iron (Fe)

Lead (Pb)

Silver (Ag)

Sodium (Na)

(2) Non metal properties

• Brittleness Non-metals are brittle in nature.

• Physical state Most of the non-metals are soft (if solid).

• Lustre Non-metals do not have lustre, i.e. shining surface.

• Electrical and thermal conductivity Non-metals are generally poor conductors of heat and electricity.

• Melting and boiling points Generally, non-metals have low melting and boiling points.