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Is Matter Around Us Pure Test - 46

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Is Matter Around Us Pure Test - 46
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  • Question 1
    1 / -0
    A solvent may be:
    Solution
    Most common solutes are solid in nature and solvents are liquids. However, solutes may be liquids and gases in some solutions and the solvent may be a gas or a solid.
    For example, in an alloy of steel, the solute and solvent both are solids.
  • Question 2
    1 / -0
    Mark the correct statement:

    (I) Two elements combine in more than a way to give a number of compounds.
    (II) Compounds are heterogeneous.
    (III) It is obtained by a chemical combination of two or more elements in a definite proportion by mass.
    Solution
    Statement-I is correct. For Example- Compounds such as Nitrous oxide ($$N_2O$$), Nitrogen dioxide ($$NO_2$$), and Nitric oxide ($$NO$$) all are produced from two elements Nitrogen ($$N$$) and Oxygen ($$O$$). Based on the given example statement-III is also correct Compounds are homogeneous i.e. their properties are the same throughout. Hence Statement-II is incorrect. 

    (D) I, III are correct.
  • Question 3
    1 / -0
    The component of the solution that is usually present in lesser quantity is called :
    Solution
    The component of the solution, dissolved in the solvent, usually present in lesser quantity is known as solute.
  • Question 4
    1 / -0
    In a sugar solution, which component is a solvent?
    Solution
    The substance in which solute is dissolved is known as a solvent. The solute is present in a smaller amount and, the solvent is present in a larger amount in a solution. In a sugar solution, sugar is present in a small amount and is dissolved in a large amount of water. Hence, water is a solvent in a sugar solution.
    Option A is correct.
  • Question 5
    1 / -0
    A solution in which the solute is a gas will be :
    Solution
    Soda water is a mixture of carbon dioxide in water.  In this solution, carbon dioxide, a gas, is the solute and water is the solvent. 
    Limewater is the common name for the solution of calcium hydroxide in water.
    Milk is not a solution
    Hence option $$A$$ is correct.
  • Question 6
    1 / -0
    Elements react to form new compounds and the composition of new substance in the compound is :
    Solution
    The composition of new substance formed is always fixed. Elements react in constant proportion to form compounds.
  • Question 7
    1 / -0
    In soda water, identify the solvent?
    Solution
    Soda water is a mixture of carbon dioxide in water. In this solution, carbon dioxide is the solute and water is the solvent.
  • Question 8
    1 / -0
    In ammonium chloride water solution, which component is said to be the solvent?
    Solution
    A solution is formed when the solute is dissolved in a solvent. The amount of solute is less compared to the amount of solvent in a solution. In ammonium chloride solution, ammonium chloride is dissolved in water. Hence ammonium chloride is solute and, water is the solvent. So, option A is correct. 
  • Question 9
    1 / -0
    A solution in which both solute and solvent are liquids is:
    Solution
    Ethanol and water both are both liquids at room temperature. 
    Sugar and urea are generally present in solid-state and carbon dioxide is a gas at room temperature.
    So, option $$A$$ is correct.
  • Question 10
    1 / -0
    In an emulsion, dispersion medium is :
    Solution
    In an emulsion, the dispersed medium and dispersed phase both are liquids. Some examples are milk, oil in water etc.
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