Last seen: Sep 10, 2021
A is copper sulphate pentahydrate, CuSO4.5H2O B is water, H2O C is anhydrous copper sulphate, CuSO4 D is water, H2O
(a) No solution will turn blue litmus to red. (b) Solution Q (sodium hydroxide) will turn red litmus blue.
(a) A salt is a compound formed from an acid by the replacement of the hydrogen in the acid by a metal. Example: Sodium chloride – NaCl; It is obtai...
(a) Plaster of paris is calcium sulphate hemihydrate. Its chemical formula is: CaSO4.1/2H2O. (b) It is prepared by heating gypsum to a temperature o...
(a) Bleaching powder is Calcium oxychloride (CaOCl2). It is prepared by passing chlorine gas over dry slaked lime. Ca(OH)2 + Cl2 → CaCl2 + H2O (b)...
(a) Production of washing soda: Washing soda is produced from sodium chloride (or common salt) in the following three steps: (i) A cold and conce...
(a) When a concentrated solution of sodium chloride is electrolysed, it decomposes to form sodium hydroxide, chlorine and hydrogen. 2NaCl(aq) + 2H2O...
(a) Bleaching powder. (b) Gypsum. (c) It sets into a hard mass in about 30 mins. (d) Chlorine is used for sterilising drinking water supply beca...
(a) Sodium hydroxide: (i) It is used for making soaps and detergents. (ii) It is used in the manufacture of paper. (b) Chlorine: (i) It is use...
(a) Baking powder is a mixture of baking soda and tartaric acid. When baking powder mixes with water, then sodium hydrogen carbonate reacts with tarta...
(a) Gypsum is calcium sulphate dihydrate, CaSO4.2H2O. When gypsum is heated to a temperature of 100°C, it loses 3/4th of its water of crystallisation ...
(a) Sodium carbonate. (b) Bleaching powder. (c) Sodium carbonate. (d) Bleaching powder. (e) It sets into a hard mass on mixing with proper...
Working: A soda-acid type fire extinguisher contains a solution of sodium hydrogen carbonate and sulphuric acid in separate containers in separate c...
(a) Calcium oxychloride. (b) CaOCl2 (c) Calcium hydroxide and chlorine. (d) It is used for disinfecting drinking water supply.
(a) Sodium hydrogen carbonate and tartaric acid. (b) Baking powder is a mixture of baking soda and tartaric acid whereas baking soda is only sodium ...
(a) On strong heating, blue copper sulphate crystals turn white. CuSO4.5H2O + Heat → CuSO4 + 5H2O (b) When water is added to anhydrous copper sulp...
(a) If heating is not controlled while preparing POP, then all the water of crystallisation of gypsum is eliminated and it turns into a dead burnt pla...
(a) Baking soda. (b) When a solution of sodium hydrogen carbonate is heated, then it decomposes to give sodium carbonate with the evolution of carbo...
(a) The water molecules which form part of the structure of a crystal are called water of crystallization. Example: CuSO4.5H2O (b) The blue copper...
When a cold and concentrated solution of sodium chloride reacts with ammonia and carbon dioxide, sodium hydrogen carbonate and ammonium chloride are f...