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Pure And Impure Matter Test - 6

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Pure And Impure Matter Test - 6
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Weekly Quiz Competition
  • Question 1
    1 / -0
    In a mixture of phenol (80%) and water (20%), water is a
    Solution
    A solute is a substance that is dissolved in another substance. Thus in a mixture of phenol (80%) and water (20%), water is a solute.
  • Question 2
    1 / -0
    Which one of the following is not a compound?
    Solution
    Black lead is also known as graphite and it is a form of carbon in which the carbon atoms form layers. Whereas, all other options are examples of compounds.
    Red lead is Pb3O4, silicon dioxide is also known as silica, and calcium hydroxide is known as slaked lime.
  • Question 3
    1 / -0
    Rust is
    Solution
    Rust is a mixture of Fe2O3 and Fe(OH)2.
  • Question 4
    1 / -0
    Which of the following is not a metalloid?
    Solution
    Au is a symbol of gold which is a metal not a metalloid.
  • Question 5
    1 / -0
    Which of the following is a heterogeneous mixture?
    Solution
    When sulphur is mixed with water, it forms a colloid which is a heterogeneous mixture.
  • Question 6
    1 / -0
    Which of the following is an element?
    Solution
    Air is a mixture, water is a compound, amalgam is an alloy and iodine vapours is an element.
  • Question 7
    1 / -0
    The chemical symbol 'W' stands for
    Solution
    The chemical symbol 'W' stands for tungsten.
  • Question 8
    1 / -0
    Dry ice is
    Solution
    Dry ice is the solid form of carbon dioxide.
  • Question 9
    1 / -0
    The formula for lime water is
    Solution
    The formula for lime water is Ca(OH)2.
  • Question 10
    1 / -0
    In which of the following cases is cooking very slow?
    Solution
    Cooking in an open vessel is slower as compared to cooking in a pressure cooker and, cooking at higher altitudes is slower than at sea level. This is because an increase in the surrounding pressure increases the boiling point of the substance and a higher cooking temper is set up in the cooking vessel.
  • Question 11
    1 / -0
    How can mixture of NH3 and H2 be separated?
    Solution
    Mixture of NH3 and H2 can be separated by preferential liquefaction.
  • Question 12
    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 13
    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 14
    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 15
    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 16
    1 / -0
    Gypsum is
    Solution
    Gypsum is a soft sulfate mineral composed of calcium sulfate dihydrate, with the chemical formula CaSO4. 2H2O.
  • Question 17
    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 18
    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 19
    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 20
    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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