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Acids Bases And Salts Test - 1

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Acids Bases And Salts Test - 1
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Weekly Quiz Competition
  • Question 1
    1 / -0

    Which substance is formed on passing chlorine over slaked lime?

    Solution

    Chlorine acts on the slaked lime (Ca(OH)2)and forms bleaching powder (CaOCl2) as per the following reaction:

    Ca(OH)2 + Cl2 → CaOCl2 + H2O

     

  • Question 2
    1 / -0

    Gypsum is added to cement clinker to

    Solution

    Gypsum is hydrated calcium sulphate in chemical form. Gypsum plays a very important role in controlling the rate of hardening of cement. Gypsum is added to control the "setting of cement".

     

  • Question 3
    1 / -0

    Which of the following salts is soluble in water?

    Solution

    FeCl3 is soluble.
    Most metal chlorides are soluble in water (except those of silver, mercury and lead).

     

  • Question 4
    1 / -0

    Which of the following salts possesses water of crystallisation?

    Solution

    Gypsum is calcium sulphate dihydrate and possesses two molecules of water of crystallisation in its structure, i.e. CaSO4.2H2O.

     

  • Question 5
    1 / -0

    Which of the following is basic in nature?

    Solution

    CaO is basic in nature as the oxides of alkali metals (1st group) and alkaline metals (2nd group) are basic oxides.

     

  • Question 6
    1 / -0

    Why does a blue-green colour of the solution appear when copper oxide is added to dilute hydrochloric acid?

    Solution

    When copper oxide is added to dilute hydrochloric acid, the following reaction takes place:
    CuO + 2HCl → CuCl2 + H2O

    CuCl2 is dissolved in water and Cu2+ and Cl- ions make its colour bluish green.

     

  • Question 7
    1 / -0

    Which of the following factors change(s) the value of ionic product of water?

    Solution

    Ionic product of water is affected by the change in temperature. It increases with the increase in temperature. In the range of 273 K and 373 K, it is practically constant at 10-14. At 273 K, it is 10-15; and at 373 K, it is taken to be 10-13.

     

  • Question 8
    1 / -0

    Which of the following is not a mixed salt?

    Solution

    Potash alum is an example of double salt.
    Formula: K2SO4.Al2(SO4)3.24H2O

    An inorganic compound that consists of a fixed proportion of two salts, often sharing either a common cation or common anion.

    Bleaching powder, sodium potassium carbonate and disodium potassium phosphate are examples of mixed salts.

     

  • Question 9
    1 / -0

    Which of the following processes is called chloralkali process?

    Solution

    Chloralkali is an industrial process for the electrolysis of sodium chloride solution. The following reaction takes place in this process:

    2NaCl + 2H2O → 2NaOH + Cl2 + H2

     

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