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EDU.VISTA INSTITUTE, Quality Before Quantity, , CLASS 10 - SCIENCE, Chemical Reaction & Equation P-1, Time Allowed: 1 hour, 1., , Maximum Marks: 40, , What happens when a piece of, , [3], , i. Zinc metal is added to copper sulphate solution?, ii. Aluminium metal is added to dilute hydrochloric acid?, iii. Silver metal is added to copper sulphate solution? Also, write the balanced chemical, equation if the reaction occurs., 2., , Write a balanced chemical equation for each of the following reactions and also classify them. [3], i. Lead acetate solution is treated with dilute hydrochloric acid to form lead chloride and, acetic acid solution., ii. A piece of sodium metal is added to absolute ethanol to form sodium ethoxide and, hydrogen gas., iii. Hydrogen sulphide gas reacts with oxygen gas to form solid sulphur and liquid water., , 3., , Seema bought a packet of chips and opened it. Suddenly her friend Shanu came. She started, , [3], , playing and forgot to eat the chips. On the next day, when she ate the chips, she felt the taste, was not good and her health fell down. She told her mother to take her to a doctor. The doctor, told them this is because of eating rancid chips. He gave medicines, by which Seema became, well within a few days. Read the above passage and answer the following questions., i. Why do chips remain fresh for a longer time in a sealed packet?, ii. Why did chips of an open packet become rancid?, iii. What value do you infer from this passage?, 4., , Balance the following chemical equations., (i) HN O3, , + Ca(OH )2 → Ca(N O3 )2 + H2 O, , (ii) N aCl + AgN O3, (iii) BaCl2, 5., , [3], , → AgCl + N aN O3, , + H2 S O4 → BaS O4 + HCl, , Write the balanced chemical equations with state symbols for the following reactions., , [3], , i. Solutions of barium chloride and sodium sulphate in water react to give insoluble barium, sulphate and solution of sodium chloride., ii. Sodium hydroxide solution (in water) reacts with hydrochloric acid solution (in water) to, produce sodium chloride solution and water., 6., , Write balanced equation for the following reactions and identify the type of reaction., , [5], , i. Potassium bromide (aq) + Barium iodide (aq) → Potassium iodide (aq) + Barium bromide, (aq), ii. Magnesium (s) + Hydrochloric acid (aq) → Magnesium Chloride (aq) + Hydrogen (g), iii. Zinc carbonate (s) → Zinc oxide (s) + Carbon dioxide (g), , 1/2

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iv. Hydrogen (g) + Chlorine (g) → Hydrogen chloride (g), 7., , Write the balanced chemical equations for the following reactions:, , [5], , (i) Calcium hydroxide + Carbon dioxide → Calcium carbonate + Water, (ii) Zinc + Silver nitrate → Zinc nitrate + Silver, (iii) Aluminum + Copper chloride → Aluminium chloride +Copper, (iv) Barium chloride + Potassium sulphate → Barium sulphate + potassium chloride, (v) Lead acetate + Dil. Hydrochloric acid → Lead chloride + Acetic acid, 8., , Write the formula and then balance the following equations., , [5], , a. Chlorine + Sodium hydroxide → Sodium chloride + Sodium chlorate + water, b. Iron sulphate + Hydrochloric acid → Iron chloride + Hydrogen sulphide, c. Calcium + Water → Calcium hydroxide + Hydrogen, d. Zinc carbonate → Zinc oxide + Carbon dioxide, e. Sodium nitrate + Sulphuric acid (conc.) → Sodium Sulphate + Nitric acid, 9., , Convert the following word equations to balanced chemical equations., , [5], , (1) Hydrogen gas combines with nitrogen to from ammonia., (2) Hydrogen sulphide gas burns in air to give water and sulphur dioxide., (3) Barium chloride reacts with aluminium sulphate to give aluminium chloride and a, precipitate of barium sulphate., (4) Potassium metal reacts with water to give potassium hydroxide and hydrogen gas., (5) Hydrogen sulphide gas reacts with oxygen gas to form solid sulphur and liquid water., 10., , Write the formula and then balance the following equations., , [5], , a. Butane (C4H10) + Oxygen → Carbon dioxide + Water, b. Magnesium + Silver nitrate → Magnesium nitrate + Silver, c. Lime water + Carbon dioxide → Calcium carbonate + Water, d. Sodium + Water → Sodium hydroxide + Hydrogen, e. Calcium carbonate + Water + Carbon dioxide → Calcium bicarbonate, , 2/2