Acids, Bases and Salts Chapter 2 Class 10 Science PYQs


Practice PYQ of Acids, Bases and Salts Chapter 2 Class 10 Science with handpicked important questions from previous years question paper with solutions.


    Q1:

    Write balanced chemical equation for the reaction that occurs when: (i) blue coloured copper sulphate crystals are heated and (ii) Sodium hydrogen carbonate is heated during cooking.

    CBSE [2023]

    Easy

    Q2:

    A compound 'X' which is prepared from gypsum has the property of hardening when mixed with proper quantity of water. Identify 'X' and write its chemical formula.

    CBSE [2023]

    Easy

    Q3:

    In the experimental setup given below, it is observed that on passing the gas produced in the reaction in the solution 'X' the solution 'X' first turns milky and then colourless.

    Important question of Class 10

    The option that justifies the above stated observation is that 'X' is aqueous calcium hydroxide and

    (a) It turns milky due to carbon dioxide gas liberated in the reaction and after sometime it becomes colourless due to formation of calcium carbonate. (b) It turns milky due to formation of calcium carbonate and on passing excess carbon dioxide it becomes colourless due to formation of calcium hydrogen carbonate which is soluble in water. (c) It turns milky due to passing of carbon dioxide through it. It turns colourless as on further passing carbon dioxide, sodium hydrogen carbonate is formed which is soluble in water. (d) the carbon dioxide liberated during the reaction turns lime water milky due to formation of calcium hydrogen carbonate and after some time it turns colourless due to formation of calcium carbonate which is soluble in water.

    CBSE [2023]

    Easy

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