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

______ is responsible for Global warming.

(a)

Carbon di oxide

(b)

methane

(c)

chlorofluoro carbons

(d)

all the above

Rusting of iron is a _________ change.

(a)

physical

(b)

chemical

(c)

physical and chemical

(d)

neutral

The chemical reactions carried out by the passage of electricity is called.

(a)

Rusting

(b)

Thermolysis

(c)

Electrolysis

(d)

Photolysis

Enzymes and yeasts are called

(a)

catalysts

(b)

bio catalysts

(c)

chemical catalysts

(d)

physical catalysts

The brown colour of a cut apple is due to

(a)

rusting

(b)

rancidity

(c)

browning

(d)

fermentation