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Is Matter Around Us Pure Test - 13

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Is Matter Around Us Pure Test - 13
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Weekly Quiz Competition
  • Question 1
    1 / -0

    Which of the following substances contains only one kind of atoms?

    Solution

    Diamond is an element containing only atoms of carbon.

    The correct answer is D.

    Why alternative A is wrong:

    Urea is a chemical compound containing atoms of carbon, hydrogen, oxygen, and nitrogen.

    Why alternative B is wrong:

    Chalk is a compound containing atoms of calcium, oxygen, and carbon.

    Why alternative C is wrong:

    Glucose is a chemical compound containing atoms of carbon, hydrogen, and oxygen.

  • Question 2
    1 / -0

    In order to separate a mixture in good yield by crystallization, the solution must be

    Solution

    Supersaturated solutions form crystals easily.

    The correct answer is B.

    Why alternative A is wrong:

    Slightly saturated solution will not yield significant amount of crystals. It will only form crystalline powder.

    Why alternative C is wrong:

    There is no such solution which can be termed as vaporized solution.

    Why alternative D is wrong:

    Frozen solution is a solid itself. It will not give any further crystals.

  • Question 3
    1 / -0

    Use the following information to answer the next question.

    Richard was studying the change of states of matter at different temperatures. While experimenting with dry ice, he noticed that dry ice changed its state directly from solid to vapour. He wrongly noted down the phenomenon as boiling of solid in his observation book.

    The correct word or phrase that describes the above phenomenon is

    Solution

    Dry ice or solid carbon dioxide, when heated, directly sublimates to vapour from solid. The process is called sublimation.

    The correct answer is B.

  • Question 4
    1 / -0

    A substance that cannot be broken down into other simpler substances by ordinary chemical processes is known as

    Solution

    An element cannot be further broken down into other substances.

    Hence, the correct answer is option A.

     

  • Question 5
    1 / -0

    Use the following information to answer the next question.

    Solutions are _____i_____ mixtures of two or more substances whose distribution throughout the mixture is ____ii______.

    Which alternative completes the given statement?

    Solution

    A solution is a homogeneous mixture containing two or more substances. The particles are evenly distributed in the solution.

    The correct answer is A.

  • Question 6
    1 / -0

    Compounds are substances made up of two or more elements combined in specific proportions. The elements that are present in sugar are

    Solution

    Sugar is a complex compound made up of carbon, hydrogen, and oxygen.

    The correct answer is D.

  • Question 7
    1 / -0

    Use the following information to answer the next question.

    An element is a substance that is made up of only one kind of atoms. It cannot be split into two or more simpler substances by chemical means.

    Which of the following substances is made up of only one kind of atoms?

    Solution

    Copper is a metal made up of only one kind of atoms, i.e., copper atoms.

    The correct answer is D.

    Why alternative A is wrong:

    Water is a compound having a molecular formula as H2O. Hence, water contains hydrogen and oxygen.

    Why alternative B is wrong:

    Sugar is a compound containing carbon, hydrogen and oxygen.

    Why alternative C is wrong:

    Chalk is made up of calcium carbonate which contains calcium, carbon and oxygen.

  • Question 8
    1 / -0

    A compound is a pure substance that can be broken down into two or more different elements by chemical means. Which of the following substances contains different kind of elements?

    Solution

    Ammonia is a compound containing two elements, nitrogen and hydrogen.

    The correct answer is D.

    Why alternative A is wrong:

    Oxygen is an element containing only oxygen atoms.

    Why alternative B is wrong:

    Graphite is an element containing only atoms of carbon.

    Why alternative C is wrong:

    Hydrogen is an element containing only atoms of hydrogen.

  • Question 9
    1 / -0

    Use the following information to answer the next question.

    Element

    Compound

    Titanium

    Chalk

    Mercury

    Sugar

    Methane

    Ammonia

    Which substance is listed incorrectly in the given table?

    Solution

    A compound is a substance formed by the combination of two or more elements. The molecular formula of methane is CH4. Methane is a compound containing one carbon atom and four hydrogen atoms. Hence, it is listed incorrectly in the given table.

    The correct answer is C.

    Why alternative A is wrong:

    Chalk is a chemical compound containing calcium, carbon, and oxygen.

    Why alternative B is wrong:

    Sugar is a chemical compound made up of 12 carbon atoms, 22 hydrogen atoms, and 11 oxygen atoms.

    Why alternative D is wrong:

    Titanium is an element.

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