Burning of paper is a______ change.

(a)

Physical

(b)

chemical

(c)

physical & chemical

(d)

neutral

______ metal undergoes rusting.

(a)

tin

(b)

sodium

(c)

copper

(d)

iron

Brine is a concentrated solution of ______.

(a)

Sodium sulphate

(b)

sodium chloride

(c)

calcium chloride

(d)

sodium bromide

Which of the following factor induces electrolysis?

(a)

Heat

(b)

light

(c)

electricity

(d)

catalysis

Dissolved gases like sulphur dioxide, nitrogen oxides in rain water causes______

(a)

Acid rain

(b)

base rain

(c)

heavy rain

(d)

neutral rain