1) Some fruits like mango, lemon, raw grapes, orange, etc., have a sour taste due to the presence of: a) Acetic acid b) Citric acid c) Lactic acid d) Oxalic acid 2) Substances that are sour in taste are usually a) Acidic b) Basic c) Neutral d) None 3) Which of the following is a natural indicator? a) Phenolphthalen b) Sodium c) Turmeric d) Calcium 4) Dilute acid does not produce carbon dioxide on being treated with: a) Lime b) Marble c) Limestone d) Baking soda 5) Identify the products of the following reaction: a) Calcium hydrogencarbonate and chlorine gas b) Calcium chloride and water c) Calcium oxide, carbon dioxide and water d) Calcium chloride, carbon dioxide and water 6) When hydrogen chloride gas is prepared 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 Cl– ions from the evolved gas 7) Tomato is a natural source of which acid? a) Acetic acid b) Citric acid c) Tartaric acid d) Oxalic acid 8) Alkalis are a) bases, which are soluble in water b) acids, which are soluble in water c) acids, which are insoluble in water d) bases, which are insoluble in water 9) Sodium hydroxide is a a) weak base b) weak acid c) strong base d) strong acid 10) At what temperature is gypsum heated to form Plaster of Paris? a) 90°C b) 100°C c) 110°C d) 120°C 11) Copper sulphate crystals when heated strongly, lose their water of crystallization to give anhydrous copper sulphate accompanied by a change in color from: a) Blue to green b) Blue to sky blue c) Blue to white d) Blue to grey 12) In the following reaction, identify the salt formed → NH4OH (aq) + H2SO4 (aq) → _____ + 2H2O (l) a) NH4NO3 b) (NH4)2SO4 c) (NH4)3PO4 d) (NH4)2S 13) The acid produced naturally in our stomach is: a) Tartaric Acid b) Citric Acid c) Salt d) Hydrochloric Acid 14) When the soil is too basic, plants do not grow well in it. To improve its quality what must be added to the soil? a) Organic matter b) Quick lime c) Slaked lime d) Calamine Solution 15) Products of a neutralisation reactionb are always a) Salt and water b) Salt and a base c) An acid and a base d) An acid and a salt

ACIDS, BASES AND SALTS ( CLASS 10)

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