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Chemistry Test - 6

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Chemistry Test - 6
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Weekly Quiz Competition
  • Question 1
    1 / -0

    Estimation of calcium and magnesium is done by which of the following?

    Solution

    To estimate the calcium content in the given solution, a known volume of it is titrated with standard EDTA solution. In the presence of magnesium, calcium can be titrated with EDTA by using Patton and Reeder's indicator at pH values between 12 and 14. The indicator combines with calcium ions forming a red coloured complex.

    Near the end point, when free calcium ions are exhausted in the solution, further addition of EDTA dissociates Ca-In complex, consumes the calcium ions and releases free indicator, which is blue in colour. Therefore, the colour change is wine red to blue.

  • Question 2
    1 / -0

    Calcium cyanamide reacts with steam to form ammonia and

    Solution

    Calcium cyanamide reacts with steam to form ammonia and calcium carbonate CaCN2+3H2O→ CaCO3++2NH3

  • Question 3
    1 / -0

    Which of the following elements is not an ore of magnesium?

    Solution

    Magnesite = MgCO3

    Dolomite = CaMg(CO3)2

    Gypsum = CaSO4·2H2O

    Carnallite = KMgCl3·6(H2O)

     

  • Question 4
    1 / -0

    What are the products of the decomposition of limestone?

    Solution

    Calcium carbonate is strongly heated until it undergoes thermal decomposition to form calcium oxide and carbon dioxide.

  • Question 5
    1 / -0

    Which of the following alkaline earth metals will give grassy green colour in flame?

    Solution

    Barium gives grassy green colour in flame.

  • Question 6
    1 / -0

    Which of the following inter-halogen compounds cannot be formed?

    Solution

    Chlorine is only a slightly stronger oxidising agent than bromine. Therefore, chlorine cannot oxidise bromine to +7 oxidation state. So, BrCl7 cannot be formed.

  • Question 7
    1 / -0

    In silicon dioxide,

    Solution

  • Question 8
    1 / -0

    The halogen with the highest value of ionisation energy is

    Solution

    Fluorine has highest value of electro negativity. Hence it has highest ionization energy.

  • Question 9
    1 / -0

    Which of the following compounds burns to form an oxide, which is gaseous at room temperature?

    Solution

    Sulphur burns with a blue flame concomitant with formation of sulphur dioxide, which is gaseous at room temperature.

  • Question 10
    1 / -0

    When lead nitrate is heated, it gives

    Solution

    Lead nitrate when heated will decompose forming lead oxide, nitrogen oxide, and oxygen.

    Equation:

    2Pb(NO3)2 will give 2PbO + 4NO2 + O2

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