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

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 the basic material to manufacture urea.

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Ammonia

Electrolysis of Brine solution gives ______ gases.

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Chlorine and hydrogen

______ is the enzyme responsible for browning of vegetables, fruits.

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Polyphenol oxidase or tyrosinase.

Formation of slaked lime from quicklime is a endothermic reaction.

(a) True

(b) False

CFC is a pollutant.

(a) True

(b) False

Light energy may come out due to chemical reactions.

(a) True

(b) False

On heating, calcium carbonate gives calcium oxide and oxygen. Is it exothermic reaction or endothermic reaction?

What is the role of a catalyst in a chemical reaction?

Why photosynthesis is a chemical reaction?

Discuss acid rain occurs due to emission of smoke from vehicles and industries?

Is rusting good for Iron materials? Explain.

Do all the fruits and vegetables undergo browning? Explain.

Explain how food items are spoiled by chemical reactions?