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Metals and Non-metals Test - 1

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Metals and Non-metals Test - 1
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  • Question 1
    1 / -0

    Which of the following methods is not a method to prevent rusting of iron articles?

    Solution

    Applying a coating of copper on iron articles does not prevent them from rusting. Copper is a metal which also undergoes corrosion. Therefore, it cannot prevent the rusting of iron articles.

  • Question 2
    1 / -0

    Al is used in the manufacture of cooking utensils and boilers because of its

    Solution

    In order to answer this question, the student should know the properties of various metals. Aluminium has high thermal conductivity. Hence, it is used in the manufacture of cooking utensils and boilers.

    The correct answer is C.

    Why alternative A is wrong:

    Ductility is the property by which metals can be drawn into wires. This does not account for the suitability of Al for its usage in the manufacture of cooking utensils and boilers. Hence, this alternative is incorrect.

    Why alternative B is wrong:

    Malleability is the property by which a metal can be beaten into thin sheets. This does not account for the suitability of Al for its usage in the manufacture of cooking utensils and boilers. Hence, this alternative is incorrect.

    Why alternative D is wrong:

    Electrical conductivity is the ability of a metal to conduct electricity. It is not taken into account while making cooking utensils and boilers. Hence, this alternative is incorrect.

  • Question 3
    1 / -0

    Which element is used in the treatment of anaemia?

    Solution

    Anaemia occurs because of the deficiency of red blood cells (RBCs) in the blood. Iron is a very important constituent of the RBCs and its deficiency in the body reduces the number of RBCs present in the blood. This causes anaemia. Hence, iron tablets are used in the treatment of anaemia.

    The correct answer is A.

    Why alternative B is wrong:

    Calcium is required for the development of bones in the human body. Its deficiency can lead to osteoporosis.

    Why alternative C is wrong:

    Zinc is used to activate many enzymes in the human body.

    Why alternative D is wrong:

    Phosphorus is an important constituent of the DNA and RNA. It is required for the bones.

  • Question 4
    1 / -0

    Since sodium is a highly flammable and corrosive metal, it is stored in

    Solution

    Sodium metal is highly water reactive and explosive in nature. Hence, it is kept in an inert solvent such as kerosene.

    The correct answer is A.

    Why alternatives B, C and D are wrong:

    Sodium is a very water reactive and flammable solid. It reacts vigorously with water, steam, and acids to release explosive hydrogen. It may ignite spontaneously in moist air or oxygen.

  • Question 5
    1 / -0

    Which of the following non-metallic substances has the highest melting point?

    Solution

    The melting and boiling points of non-metals are quite low. However, diamond, an allotropic form of carbon, is the only non-metallic substance that has a very high melting point. The melting point of a diamond is more than 3500°C.

  • Question 6
    1 / -0

    Why is small amount of carbon added to iron?

    Solution

    Iron is a widely used metal, but pure iron is a little soft. The strength of iron can be improved by adding a small amount of carbon to it. Thus, carbon is added to iron in very small quantity (about 0.05%) to improve its strength.

    Why alternative A is wrong:

    On adding small amount of carbon, the cost of iron is not reduced.

    Why alternative C is wrong:

    The malleability of iron is not increased by adding carbon. Pure iron is more malleable than steel.

    Why alternative D is wrong:

    On adding carbon to iron, steel is formed which can also undergo rusting.

  • Question 7
    1 / -0

    Which of the following properties is not a general property of metals?

    Solution

    Metals are usually hard. However, there are a few exceptions such as metals like sodium are potassium, which are soft and can be cut with a knife. On the other hand, mercury is the only metal, which is found in the liquid state at room temperature.

  • Question 8
    1 / -0

    Which of the following metals is neither malleable nor ductile?

    Solution

    Sodium is a very soft and flammable metal. It is neither malleable nor ductile. Sodium is a very reactive metal. Hence, it is stored under kerosene.

  • Question 9
    1 / -0

    Which of the following statements is correct?

    Solution

    The process of depositing a layer of zinc over iron articles is called galvanization. Iron pipes are coated with zinc to prevent rusting.

  • Question 10
    1 / -0

    Which of the following compositions is correct composition of thermite?

    Solution

    Thermit is mixture of 3 parts of Fe2O3 and 1 part of Al powder.

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