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Metals and Non-metals Test - 7

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Metals and Non-metals Test - 7
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  • Question 1
    1 / -0

    Ayush is putting H2SO4 in the test tube containing water whereas Piyush is putting water in the lest tube containing H2SO4. Which of the two is likely to face danger?

    Solution

    Piyush is likely to face danger. Addition of water to concentrated sulphuric acid is an exothermic reaction and can lead to explosions. Water should not be poured into a container containing an acid.

  • Question 2
    1 / -0

    Before keeping any eatables in the jar, Riya always keeps anhydrous CaCl2 in the bottle to:

    Solution

    Anhydrous calcium chloride is used to absorb moisture or as a packaging aid to ensure dryness.

  • Question 3
    1 / -0

    Which element is stored in water and which element is stored in kerosene?

    Solution

    Phosphorus and sodium are highly reactive at room temperature. Phosphorus is stored under water. Sodium reacts with water, hence it is stored under kerosene.

  • Question 4
    1 / -0

    Metal which is liquid at room temperature is:

    Solution

    Mercury is a liquid at room temperature. Lead, sodium and silver are solids.

  • Question 5
    1 / -0

    What are the main impurities present with bauxite ore?

    Solution

    Bauxite usually contains silica (SiO2), iron oxides and titanium oxide (TiO2) as impurities.

  • Question 6
    1 / -0

    Dried fruit plastic bags sold in the market are filled with:

    Solution

    Nitrogen prevents oxidation of dried fruits. It is used to prevent rancidity.

  • Question 7
    1 / -0

    Name the metal which is the best conductor of electricity.

    Solution

    Silver has the highest thermal conductivity amongst the elements. Although it is the best conductor, copper and gold are used more often in electrical applications because copper is less expensive and gold has a much higher corrosion resistance.

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