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ACIDS, BASES AND, SALTS, , , , Their defi, , pH scale (Definition relating to logarithm not required), importance of pH in everyday life; preparation and, yses of Sodium Hydroxide, Bleaching powder, Baking soda, Washing soda and Plaster of Paris., , STAND ALONE MCQs, , Q. 1, An aqueous solution ‘A’ turns phenolphthalein, solution pink, On addition of an aqueous solution, B’ to ‘A, the pink colour disappears. The following, statement is true for solution ‘A and ‘B’., [Outside Delhi 2020], (A) Ais strongly basic and B is a weak base., (B) Ais strongly acidic and B is a weak acid., (©) Ahas pH greater than 7 and B has pH less than 7., (D) Ahas pH less than 7 and B has pH greater than 7., Ans. Option (C) is correct., Q.2. Identify the basic salt from the following salts:, (A) Na,CO, (B) NH,Cl, (©) NaNO, (D) KCl, [Board SQP 2020], , , , Ans. Option (A) is correct., , | Explanation: Na,CO; is a basic salt. 1, Q.3. Which one of the following can be used as an acid—, base indicator by a visually impaired student?, (A) Litmus (B) Turmeric, (C) Vanillaessence _ (D) Petunia leaves, Ans. Option (C) is correct., , ., , , , , Q. 4. Which of the eiewin is acidic i, , in nature?, (A) Lime j ‘, (©) Lime water, , , , nitions In terms of furnishing of H' and OH ions, general properties, examples and uses, concept of, , , , , , , Term-|, , a, , , , , , (1 mark each), , Explanation: Lime juice is acidic in nature as, the juice is obtained from lime, a citrus fruit., This contains citric acid, and is therefore sour, in taste., , Q.5. During the preparation of hydrogen chloride gas, , on a humid day, the gas is usually passed through, the guard tube containing calcium chloride. The, role of calcium chloride taken in the guard tube, is to, , (A) absorb the evolved gas., , (B) moisten the gas., , (C) absorb moisture from the gas., , (D) absorb CI ions from the evolved gas., , Ans. Option (C) is correct., , Explanation: The role of calcium chloride taken, , in the guard tube is to absorb moisture from, , the gas. This is because calcium chloride is used, as a drying agent which absorbs moisture from, the hydrogen chloride (HCl) gas., , Q.6.Which of the following are present in a dilute, , aqueous solution of hydrochloric a, (A) H,O* + Cr (B) H,O, (€) Cl + On (D) Unioni, , , , Ans. Option (A) is correct., , , , , if an, e?, , /11/11 09:49