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The p-Block Elements Test - 4

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The p-Block Elements Test - 4
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  • Question 1
    1 / -0

    Ammonia act as a Lewis base because nitrogen has

    Solution

    Lewis base is a substance which can donate lone pair of electrons. NH3 has one lone pair of electrons on the nitrogen atom therefore can act as Lewis base.

  • Question 2
    1 / -0

    Which allotrope of phosphorous is most stable?

    Solution

    Black Phosphorus is most stable isotope of phosphorus because it is highly polymerized form of phosphorous.

  • Question 3
    1 / -0

    At what temperature white phosphorous changes to red phosphorous?

    Solution

    White phosphorus when heated to 573 K in an inert atmosphere for several days red Phosphorus is obtained.

  • Question 4
    1 / -0

    What is the spontaneous ignition temperature of white phosphorous?

    Solution

    The spontaneous ignition temperature of white phosphorus is 35oC. it id due to angular strain in the P4 molecules where the angles are only 60o.

  • Question 5
    1 / -0

    Elements of which group are known as ore forming elements?

    Solution

    A maximum number of ores contain group 16 elements (O, S etc). They are known as "chalcogens"  which was derived from the Greek word chalcos , meaning "ore formers," since they all are be found in copper ores.

  • Question 6
    1 / -0

    Most metal oxides are

    Solution

    In general, metal oxides are basic and ionic in nature.

  • Question 7
    1 / -0

    The thermal stability of hydrides of group 16 elements decreases in the order

    Solution

    As we move down the group bond length increases and bond enthalpy for the dissociation of H-E bond decreases. Due to decrease in enthalpy the thermal stability of hydrides decreases down the group.

  • Question 8
    1 / -0

    Formula of oleum is

    Solution

    Oleum is pyrosulphuric acid (H2S2O7)

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