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Chemistry Test - 23

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Chemistry Test - 23
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Weekly Quiz Competition
  • Question 1
    3 / -1

    In which of the following properties is hydrogen different from halogens?

    Solution

    Electronic configuration of halogens is ns2np5, while hydrogen has half-filled valence shell, i.e. ns1.

    Hydrogen and halogens both have a high ionisation energy.

    Hydrogen can exhibit -1 oxidation state like the halogens.

    Hydrogen as well as halogens occur as diatomic molecules.

  • Question 2
    3 / -1

    Which of the following covalent bonds has the highest ionic character?

    Solution

    Among the given options, the difference in electronegativity between the H and O is the highest. So, this bond will have the highest ionic character.

  • Question 3
    3 / -1

    Directions: The question consists of two statements: Assertion and Reason. While answering the question, you are required to choose any one of the following four responses.

    Assertion: Benzyl bromide, when kept in acetone-water, produces benzyl alcohol.

    Reason: The reaction follows SN2 mechanism.

    Solution

  • Question 4
    3 / -1

    The unwanted impurities like sand, rocky material, lime stone, mica etc present in an ore called

    Solution

    In mining, gangue is the commercially worthless material that surrounds, or is closely mixed with, a wanted mineral in an ore deposit. The separation of mineral from gangue is known as mineral processing.

  • Question 5
    3 / -1

    Allene (C3H4) contains

    Solution

    An allene is a compound in which one carbon atom has double bonds with each of its two adjacent carbon centres. It contains two double bonds and four single bonds.

  • Question 6
    3 / -1

    Which of the following is the correct order of decreasing SN2 reactivity?

    Solution

    Rate of SN2 reaction is based on the steric hindrance and the electron density at the carbon attached to halogen.

    It follows the order: RCH2X > R2CHX > R3CX

  • Question 7
    3 / -1

    Which of the following is an example of man made ecosystem?

    Solution

    Aquarium is an example of man made ecosystem.

  • Question 8
    3 / -1

    Wurtz reaction involves the reduction of alkyl halide with

    Solution

    Wurtz reaction involves the reduction of alkyl halide with sodium in ether.

  • Question 9
    3 / -1

    Which of the following reacts with phenol to give salicylaldehyde after hydrolysis?

    Solution

  • Question 10
    3 / -1

    Clemmensen reduction of a ketone is carried out in the presence of

    Solution

    Clemmensen reduction is the reduction of carbonyl groups of aldehydes and ketones to methylene groups with amalgamated zinc and concentrated HCl.

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