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Acids Bases And Salts Test - 3

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Acids Bases And Salts Test - 3
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  • Question 1
    1 / -0

    Which one of the following is not a bleaching agent?

    Solution

    Chlorine, sulphur dioxide and sodium hypochlorite can be used as bleaching agents, but carbon dioxide cannot be used as a bleaching agent.

     

  • Question 2
    1 / -0

    Gypsum is

    Solution

    Gypsum is a soft sulphate mineral composed of calcium sulphate dihydrate. It has chemical formula CaSO4•2H2O.

     

  • Question 3
    1 / -0

    An aqueous solution of a sodium salt was electrolysed by using graphite electrodes in an electrolytic cell. A gas 'X' was evolved at the anode. When 'X' was allowed to mix with hydrogen sulphide gas contained in a jar, a yellow coloured solid was deposited on the walls of the gas jar. Which one of the following gases is 'X'?

    Solution

    Electrolysis of aqueous NaCl results in the formation of hydrogen gas at the cathode and chlorine gas at the anode.
    At the anode, chloride (Cl−) is oxidised to chlorine gas (X).

    The reaction at the anode is:
    2Cl−(g) → Cl2(g) + 2e−

    At the cathode, water is reduced to hydroxide and hydrogen gas.
    The reaction at the cathode is:

    2H2O(l) + 2e− → H2(g) + 2OH−
    When a gas jar of hydrogen sulphide is inverted over a gas jar of chlorine (X), a yellow precipitate of sulphur and hydrogen chloride gas will be formed.

    H2S(g) + Cl2(g) → 2HCl(g) + S(s)

     

  • Question 4
    1 / -0

    Permanent hardness of water can be removed by adding

    Solution

    Calcium and magnesium ions present in hard water react with sodium carbonate to produce soluble and harmless sodium salts.

     

  • Question 5
    1 / -0

    Which one of the following pairs of compounds cannot co-exist in water?

    Solution

    NaHCO3 is an amphoteric compound and can react with both acids and bases.

    It reacts with NaOH to form a neutral salt and water.

    NaHCO3(aq) + NaOH(aq) → Na2CO3(aq) + H2O(l)

     

  • Question 6
    1 / -0

    Sodium bicarbonate is also known as

    Solution

    Sodium bicarbonate (sodium hydrogen carbonate) is a chemical compound with formula NaHCO3. It is a salt composed of sodium ions and bicarbonate ions. It is also known as baking soda.

     

  • Question 7
    1 / -0

    Which of the following is not a salt?

    Solution

    H3PO4 is not a salt, it is an acid. It has three acidic protons (attached to oxygen) and is therefore tribasic. Its salts are called phosphates.

     

  • Question 8
    1 / -0

    Which of the following is used for disinfecting drinking water?

    Solution

    Bleaching powder is a chemical compound with formula CaClO2 (Calcium hypochlorite). It is widely used for water treatment. It is used for disinfection of water in the treatment process.

    It is a mixture of two salts present in fixed proportions are CaCl2 and Ca(OCl)2,both of which share a common cation ie Ca2+.
    Thus bleaching powder is Ca(OCl)Cl or CaOCl2.

    H2O + CaOCl2 → Ca(OH)2 + Cl2

    The chlorine released by the bleaching powder kills pathogens (disease causing bacteria).

     

  • Question 9
    1 / -0

    Which of the following is not a use of sodium hydrogen carbonate?

    Solution

    Sodium hydrogen carbonate is not used in glass industry. Glass production is the most common use of sodium carbonate.

     

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