(1) Snake’s venom is not a poisonous chemical.

(2) Dyes for rock painting has been used since ancient time

(3) Chemistry doesn’t include the study of substances.

(4) Nylon is not a synthetic fibre.

(5) Nuclear energy can never be an alternative source of energy.

(3) Write the full forms of the following: (a) TNT (b) LPG

(4) Write one example for each of the following: (a) Fungicide (b) Weedicide

(1) Write the name of the chemical which are found in chillies and lemons?

(2) Explain the role of chemistry in ancient India.

(5) Explain the importance of chemistry in industry.

(2) John Dalton was born in ________.

(3) The full form of TNT is ________.

(1) L.P.G is used for ________.

(4) Radioactivity was discovered by _______.

(1) What is science?

(4) Write any one example of a fertiliser.

(5) Write the definition of an insecticide.

(3) What do you mean by alchemy?

(2) What is chemistry?

(3) Write the full forms of the following: (a) TNT (b) LPG

(4) Write one example for each of the following: (a) Fungicide (b) Weedicide

(1) Write the name of the chemical which are found in chillies and lemons?

(2) Explain the role of chemistry in ancient India.

(5) Explain the importance of chemistry in industry.

(1) Name the scientists who discovered the following: (a) Polythene (b) Hydrogen (c) Aspirin

(2) Write the composition of- (a) Talcum powder (b) Cement (c) Toothpaste

(3) Write any three disadvantages of chemistry.

(4) Write short notes on- (a) Iron Pillar of Delhi (b) RDX (c) Dmitri Mendeleev

(5) What is the contribution of chemistry in the following fields? (a) Clothing (b) Cosmetics (c) Medicines (d) Food preservation (e) Comforts and pleasure

Fertiliser

Insecticide

Metalachlor

BHC

Benzene hexa chloride