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Hydrogen Test - 7

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Hydrogen Test - 7
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  • Question 1
    1 / -0

    Only one element of ________ forms hydride.

    Solution

    Only Chromium (Cr)  who belongs to group 6 forms hydride.

    Elements of group 7, 8, 9 of d – block do not form hydrides at all. This inability of metal, of group 7, 8, 9 of periodic table to form hydrides is referred to as hydride gap of d – block.

  • Question 2
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    Which of the following equations depict the oxidising nature of H2O2?

    Solution

    I- gets oxidize to I2 in presence H2O2 which itself get reduce to H2O.

  • Question 3
    1 / -0

    Which of the following equation depicts reducing nature of H2O2?

    Solution

    I​​​​​​2 gets reduce to I​​​​​​- while H2O2​​​ get oxidize to O​​​​​​2

  • Question 4
    1 / -0

    H2O2behaves as a bleaching agent because:

    Solution

    Because it can undergo bond dissociation randomly in presence of light. It dissociates and generates free radicals which is very reactive and acts like bleaching agent.

  • Question 5
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    Which of the following statements are not true for hydrogen?

    Solution

    H+ cannot exist freely due to its small size.

  • Question 6
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    Dihydrogen can be prepared on commercial scale by different methods. In its preparation by the action of steam on hydrocarbons, a mixture of CO and H2 gas is formed. It is known as ____________.

    Solution

    Water gas is a combustion fuel containing carbon monoxide (CO) and hydrogen gas (H2). Water gas is made by passing steam over heated hydrocarbons.

    The water-gas shift reaction can be used to reduce carbon dioxide levels and enrich hydrogen content, making water gas.

  • Question 7
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    Which of the following statement(s) is/are correct in the case of heavy water?

    Solution

    Heavy water is used in certain types of nuclear reactors, where it acts as a neutron moderator to slow down neutrons so that they are more likely to react with the fissile uranium-235 than with uranium-238, which captures neutrons without fissioning.

  • Question 8
    1 / -0

    Which of the following statements about hydrogen are correct?

    Solution

    Hydrogen has three naturally occurring isotopes: protium, deuterium and tritium. Each isotope has different chemical properties.

    Protium is the most prevalent hydrogen isotope, with an abundance of 99.98%. It consists of one proton and one electron. It is typically not found in its monoatomic form, but bonded with itself (H2) or other elements.

  • Question 9
    1 / -0

    Some of the properties of water are described below. Which of them is/are not correct?

    Solution

    When water freezes, water molecules form a crystalline structure maintained by hydrogen bonding. Solid water, or ice, is less dense than liquid water. Ice is less dense than water because the orientation of hydrogen bonds causes molecules to push farther apart, which lowers the density.

  • Question 10
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    Hardness of water may be temporary or permanent. Permanent hardness is due to the presence of

    Solution

    Permanent hardness in water is hardness due to the presence of the chlorides, nitrates and sulphates of calcium and magnesium, which will not be precipitated by boiling.Water can be softened using washing soda or an ion-exchange resin.

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