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Q.1., , (1), , (2), , (3), , (4), , (B) Choose and write the correct option:, A chemical reaction involves , (a) Only breaking of bonds., , (b) Only formation of bonds., , (c) Both breaking and formation of bonds., (d) None of these., , A balanced chemical equation always obeys, , (a) Law of conservation of Mass, (b) Law of thermal equilibrium, (c) Law of conservation of energy, (d) All of the above, , Oily food kept out for few days gives a bad taste, and a bad smell because of ., , (a) Corrosion (b) Displacement, (c) Heating (d) Rancidity, The sign ¥ indicates., , (a) Release of gas c) Formation of precipitate, , (b) Dissolution of gas d) Lowering of temperature

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(5), , (6), , (7), , (8), , (9), , (10), , What is rust?, , (a) Sodium oxide (b) Iron oxide, , (c) Copper oxide (d) Silver oxide, , Because of the formation of which of the following,, lime water turns milky when carbon dioxide is, passed through it?, , (a) Calcium Carbonate, , (b) Calcium bicarbonate, , (c) Calcium hydroxide, , (d) Sodium Carbonate, , Which of the following is formed when Sodium, hydroxide reacts with hydrochloric acid?, , (a) Calcium Chloride, , (b) Hydrogen Chloride, , (c) Sodium hydroxide, , (d) Sodium Chloride, ____________ is a physical change., (a) Ice changes into water, , (b) Milk is set into curd, , (c) Ripening of fruit, , (d) Respiration process, , When sulphuric acid is poured over zinc, which, of the following gas is formed?, , (a) Sulphur dioxide (b) Hydrogen, , (c) Oxygen (d) Zinc dioxide, Heating of sugar is called a___ _.. reaction., (a) Combination reaction, , (b) Displacement reaction, , (c) Double displacement reaction, (d) Decomposition reaction