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p-Block Elements Test - 38

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p-Block Elements Test - 38
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Weekly Quiz Competition
  • Question 1
    1 / -0

    The structure of white phosphorus is:

    Solution

    The structure of white phosphorus is tetrahedral. Phosphorus or s tetraphosphorus (P4​) exists as molecules made up of four atoms in a tetrahedral structure. The molecule is described as consisting of six single P–P bonds.

  • Question 2
    1 / -0

    Each of the following is true for white and red phosphorus except that they:

    Solution

    White phosphorus, yellow phosphorus or simply tetraphosphorus (P4​) exists as molecules made up of four atoms in a tetrahedral structure. As phosphorous molecule is non polar, so it dissolves in non polar solvent like carbon disulfide, CS2​.

  • Question 3
    1 / -0

    Phosphine is prepared by the action of?

    Solution

    Phosphine is prepared by the action of alkali like NaOH in aqueous medium.

    Hence option B is correct.

  • Question 4
    1 / -0

    Fill in the blanks :
    (i)   Ca3​P2​ + 6HCl → 3CaCl2​ + __p__
    (ii)  P4 ​+ 3NaOH + 3H2​O → ___q___+ 3NaH2​PO2​
    (iii) PH4​I + KOH → KI + H2​O + ___r___
    p, q and r respectively are:

    Solution

    p, q and r respectively are PH3​, PH3​, PH3​

    (i)   Ca3​P2 ​+ 6HCl → 3CaCl2 ​+ PH3​

    (ii)  P4​ + 3NaOH + 3H2​O → PH3 ​+ 3NaH2​PO2​

    (iii) PH4​I + KOH → KI + H2​O + PH3​

  • Question 5
    1 / -0

    Holmes signal uses chemical compound

    Solution

    Holmes signal uses calcium carbide and calcium phosphide. The spontaneous combustion of phosphine is technically used in Holmes signals. Containers containing a mixture of calcium carbide and calcium phosphide are pierced and thrown in the sea when the gases burn and serve as a signal.

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