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Is Matter Around Us Pure Test - 26

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Is Matter Around Us Pure Test - 26
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  • Question 1
    1 / -0
    Benzene and water can be separated by
    Solution
    Benzene and water are immiscible liquids. They can be separated by a separating funnel where the heavier liquid (water) will form a lower layer and lighter liquid (Benzene) will form the upper layer.
  • Question 2
    1 / -0
    Two miscible liquids having different boiling points can be separated by:
    Solution
    Two miscible liquids having different boiling points can be separated by fractional distillation.
    A mixture of two miscible liquids can be separated by the process of fractional distillation. The separation of two liquids by fractional distillation depends on the difference in their boiling points. Fractional distillation is carried out by using a fractionating column.
    Hence, option C is correct.
  • Question 3
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     The properties of compounds are very ..............from the properties of the elements that form them
    Solution
    The properties of compounds are different from those of the elements of which they are made. Thus, water is made from hydrogen and oxygen. Hydrogen is combustible and oxygen supports combustion whereas water extinguishes certain types of fires.

  • Question 4
    1 / -0

    Directions For Questions

    Take small amounts of salt and add them to large amounts of water. $$X$$ is formed. The substance present in small amounts is called $$Y$$ whereas the substance present in large amounts is called $$Z$$ and the salt solution formed is called $$A$$. The solution in which more of the solute can be dissolved at a given temperature is called the $$B$$ solution. The solution which cannot be dissolved any more of the solute at a given temperature is $$C$$ solution.

    ...view full instructions

    What is $$Y$$?
    Solution
    When salt is added to water, it becomes a solution which is known as a salt solution in which solute is salt & solvent is water.
    $$Y \longrightarrow$$ Solute.
  • Question 5
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    Soil is ________________ of solids.
    Solution
    A handful of soil is a heterogeneous mixture of solids as it not uniform in composition throughout.
  • Question 6
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    A homogeneous mixture of two liquids having a small difference (less than $$25^{o}C$$) in boiling points can be separated by using:
    Solution
    A homogeneous mixture of liquid components that have boiling point differences less than $$25^{O}C$$ can be separated by using the fractional distillation method. 

    For example, the mixture of crude oil is separated by using fractional distillation.
  • Question 7
    1 / -0
    Separation of liquid $$N_2$$ from liquid $$O_2$$ is done by fractional ________:
    Solution
    Fractional distillation  is the separation of a mixture into its component parts or fractions such as in separating chemical compounds by their boiling point by heating them to a temperature at which one or more fractions of the compound will vaporize. It is used in air separation producing liquid oxygen and liquid nitrogen.
  • Question 8
    1 / -0
    Method used for separating dyes in ink is called __________.
    Solution
    Chromatography is a method of separating out materials from a mixture. Ink is a mixture of several dyes and therefore we can separate those colors from one another using chromatography. When ink is exposed to certain solvents the colors dissolve and can be seperated out. When we expose a piece of paper with ink on it to a solvent, the ink spreads across the paper when the ink dissolves.
  • Question 9
    1 / -0
    Which among the following is a solid-solid homogenous mixture? 
    Solution
    Air: homogeneous mixtures of different gases
    Dough: a heterogeneous mixture of flour and water
    Sugar water: solid-liquid homogeneous mixture

    Hence, none of these is a solid-solid homogeneous mixture.
  • Question 10
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    Honey is the example of :
    Solution
    A mixture is a material system made up of two or more different substances which are mixed but are not combined chemically. A mixture refers to the physical combination of two or more substances on which the identities are retained and are mixed. Honey is a mixture.
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