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Is Matter Around Us Pure Test - 27

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Is Matter Around Us Pure Test - 27
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  • Question 1
    1 / -0
    A homogenous mixture of two solids is :
    Solution
    Brass: A yellowish alloy of copper and zinc, sometimes including small amounts of other metals, but usually $$67 \%$$ copper and $$33 \%$$ zinc.
  • Question 2
    1 / -0
    Which of the following is not a pure substance?
    Solution
    Gold (Au) is found in its pure form in nature. 

    Glucose is a naturally occurring sugar with fixed composition and chemical formula $${ C }_{ 6 }{ H }_{ 12 }{ O }_{ 6 }$$. It is found in its pure form in milk, wheat and many fruits. 

    Water in its pure form is found in nature with chemical formula $$ { H }_{ 2 }O $$. 

    Milk is a heterogeneous mixture of fat (which is a form of ester) and sugar (a form of carbohydrate) and hence is not a pure substance like an element or a compound.

    Hence, option C is correct.
  • Question 3
    1 / -0
    Milk is an 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.

    Milk is an example of mixture.
  • Question 4
    1 / -0
    A homogenous mixture of two gases is :
    Solution
    The air that we breathe is a homogeneous mixture of oxygen, nitrogen, argon, and carbon dioxide, along with other elements in smaller amounts. Because each layer of the Earths atmosphere has a different density, each layer of air is its own homogeneous mixture.
  • Question 5
    1 / -0
    Which of the following are homogeneous mixtures?
    Solution
    A homogeneous mixture is a mixture where the components that make up the mixture are uniformly distributed throughout the mixture. The composition of the mixture is the same throughout. There is only one phase of matter observed in a homogeneous mixture.
    • air
    • sugar water
    • rain water
    • vodka
    • vinegar
    • dishwashing detergent
    • steel
  • Question 6
    1 / -0
    Heterogenous mixture is:
    Solution
    A homogeneous mixture is a mixture where the components that make up the mixture are uniformly distributed throughout the mixture. The composition of the mixture is the same throughout. There is only one phase of matter observed in a homogeneous mixture.
    • air
    • sugar water
    • rain water
    • vodka
    • vinegar
    • dishwashing detergent
    • steel
    A heterogeneous mixture is a mixture where the components of the mixture are not uniform or have localized regions with different properties. Different samples from the mixture are not identical to each other. There are always two or more phases in a heterogeneous mixture, where you can identify a region with properties that are distinct from those of another region, even if they are the same state of matter (.e.g., liquid, solid).
    • cereal in milk
    • vegetable soup
    • pizza
    • blood
    • gravel
    • ice in soda
    • salad dressing
    • mixed nuts
    • bowl of colored candies
    • soil
  • Question 7
    1 / -0
    Of the following substance which is an element, a mixture and a compound? 
    Sea water 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. Seawater is a complex mixture of 96.5 percent water, 2.5 percent salts, and smaller amounts of other substances, including dissolved inorganic and organic materials, particulates, and a few atmospheric gases. 
  • Question 8
    1 / -0
    Among the following, name a mixture which is used as a food ?
    Solution
    In chemistry, 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 in the form of solutions, suspensions, and colloids.

    Note that a mixture:

    • consists of two or more different elements and/or compounds physically intermingled,
    • can be separated into its components by physical means, and
    • often retains many of the properties of its components.
    Milk is a mixture used as food.
  • Question 9
    1 / -0
    Which of the following are related to apple juice ?
    Solution
    Apple juice is a fruit juice made by the maceration and pressing of apples. 
    so its a mixture.
  • Question 10
    1 / -0
    Among the following, bronze is a/an example of :
    Solution
    Bronze is an alloy of primarily copper and tin. It is categorized as a mixture.

    Hence, option B is correct.
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