Question

1 Which among the following is not a physical change?
(a) Melting of solids into liquids
(b) Vaporisation of liquids into gases
(c) Liquefaction of gases into liquids
(d) Decay of matter
2 Which among the following in nota chemical change?
(a) Melting of ice
(b) carbon cycle
(c) Dehydration of substances
(d) fermentation of substances
3. The process of formation of metallic compounds due to chemical reaction between metals and atmospheric gases is known as
(a) corrosion
(b)galvanization
(c) electroplating
(d) none of these
4.The corrosion of iron is called
(a) rusting
(b) oxidation
(c) reduction
(d) none of these
5. The substances undergoing a chemical reaction are called
(a) reactants
(b) products
(c) oxidising agents
(d) reducing agents
6. In which of the following reactions, a substance is broken down into two or more substances?
(a) Combination reactions
(b) Decomposition reactions
(c) Displacement actions
(d) Double displacement reactions
7. In the reaction Zn+Cuso4 --> ZnSo4 + Cu
(a) zinc is undergoing reduction
(b) copper sulphate is undergoing oxidation
(c) zinc is undergoing oxidation
(d) all the above are correct​

Answer 1

1. d) decay of matter

2. a) melting of ice

3. a) corrosion

4. a) rusting

5. a) reactants

6. b) decomposition reaction

7. c) zinc is undergoing oxidation