Give two uses of:

(a) Silicon

(b) Antimony

(c) Tungsten

(d) Germanium

Fill in the blanks:

(a) The most ductile metal is …………… .

(b) A metal stored in kerosene oil is …………… .

(c) Tungsten metal is a good conductor of …………… .

(d) …………… is a soft metal.

(e) …………… is the hardest compound known to us.

(f) A non-metal used to purify water is …………… .

(g) A metal that gives dazzling effect to crackers when they explode is …………… .

(h) A chemical compound that makes up the striking heads of match sticks is …………… .

Write True or False for the following statements:

(a) Silver is used to make electric cables.

(b) Iodine acts as an antiseptic in the form of tincture of iodine.

(c) Sodium can be cut with a knife.

(d) Antimony is a metal.

(e) Sand is an oxide of silicon.

The noble gas used in advertising signboards is:

1. Helium
2. Neon
3. Argon
4. Krypton