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Pure And Impure Matter Test - 4

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Pure And Impure Matter Test - 4
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Weekly Quiz Competition
  • Question 1
    1 / -0

    How can mixture of NH3 and H2 be separated?

    Solution

    Mixture of NH3 and H2 can be separated by preferential liquefaction.

     

  • Question 2
    1 / -0

    Which of the following can be separated by solvent extraction?

    Solution

    The method of solvent extraction is used for separating the components of a liquid that have different wetting properties in the same liquid.
    Mixture of sulphur and sand can be separated by solvent extraction method.

    On adding the CS2 to the mixture only sulphur dissolves and the sand can be separated out by filtration.

     

  • Question 3
    1 / -0

    Nitrogen and oxygen form three oxides:

    In oxide I, 1.00 gm nitrogen combines with 0.57 gm oxygen.
    In oxide II, 2.00 gm nitrogen combines with 2.24 gm oxygen.
    In oxide III, 3.00 gm nitrogen combines with 5.11 gm oxygen.
    These results are in accordance with the law of

    Solution

    Three oxides of nitrogen and oxygen are the result in accordance with the law of of multiple proportions. It states that, if two elements form more than one compound between them, then the ratios of the masses of the second element which combine with a fixed mass of the first element will be ratios of small whole numbers.

     

  • Question 4
    1 / -0

    A compound of nitrogen and oxygen on analysis showed that it contained 28 g of nitrogen to every 32 g of oxygen. Which one of the following formulae correctly represents the compound?

    Solution

    If a compound of nitrogen and oxygen on analysis showed that it contained 28 g of nitrogen to every 32 g of oxygen. It forms a compound with formulae N2O2.

     

  • Question 5
    1 / -0

    If an organic compound has C10H20 as its molecular formula, its empirical formula is

    Solution

    The empirical formula is the simplest formula for a compound. A molecular formula is the same as or a multiple of the empirical formula, and is based on the actual number of atoms of each type in the compound. For example, if the molecular formula of a compound is C10H20 , its empirical formula would be CH2.

     

  • Question 6
    1 / -0

    Gypsum is

    Solution

    Gypsum is a soft sulfate mineral composed of calcium sulfate dihydrate, with the chemical formula CaSO4. 2H2O.

     

  • Question 7
    1 / -0

    Red lead is

    Solution

    Lead (II,IV) oxide, also called minium, red lead or triplumbic tetroxide, is a bright red or orange crystalline or amorphous pigment.

     

  • Question 8
    1 / -0

    The phosphate of a metal has the formula: MHPO4. The formula of its chloride will be

    Solution

    The phosphate of a metal has the formula: MHPO4. The formula of its chloride will be MCl2.

     

  • Question 9
    1 / -0

    Which of the following is the formula of a compound in which a monovalent positive radical combines with chromate radical?

    Solution

    The formula of a compound in which a monovalent positive radical combines with chromate radical is X2CrO4.

     

  • Question 10
    1 / -0

    What is the formula of calcium dihydrogen phosphate?

    Solution

    The formula of calcium dihydrogen phosphate is Ca(H2PO4)2.

     

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