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p-Block Elements Test - 17

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p-Block Elements Test - 17
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Weekly Quiz Competition
  • Question 1
    1 / -0

    Which compound of nitrogen is formed when CaCN2 reacts with hot water?

    Solution

    CaCN2 + 3H2O → CaCO3 + 2NH3

     

  • Question 2
    1 / -0

    Which of the following hydrides has the highest proton affinity?

    Solution

    Ammonia is the most basic among the given hydrides and has the highest proton affinity because of the small size and the high electronegativity of the nitrogen atom.

     

  • Question 3
    1 / -0

    Which of the following methods are correct for the production of nitrogen (I) oxide?

    A. Thermal decomposition of ammonium nitrate
    B. Decomposition of N2O4
    C. Interaction of hydroxyl amine and nitrous acid

    Solution

    Thermal decomposition of ammonium nitrate and interaction of hydroxyl amine and nitrous acid, both the cases give rise to nitrogen (I) oxide as follows:

    NH4NO3 (aq) → N2O (g) + 2H2O (l)
    HNO2 + NH2OH → N2O + 2H2O

     

  • Question 4
    1 / -0

    Which of the following statements is incorrect about white phosphorus?

    Solution

    White phosphorus exists as molecules made up of four atoms in a tetrahedral structure. The tetrahedral arrangement results in ring strain and instability. The molecule is described as consisting of six single P-P bonds.

     

  • Question 5
    1 / -0

    Which of the following products is given by calcium phosphide, when it gets hydrolysed?

    Solution

    Ca3P2 + 6H2O → 3Ca(OH)2 + 2PH3

     

  • Question 6
    1 / -0

    Which of the following oxoacids of phosphorus is in +4 oxidation state?

    Solution

    In hypophosphoric acid (H4P2O6), the oxidation state of P is +4.

     

  • Question 7
    1 / -0

    Which among the following trihalides of nitrogen is the least basic?

    Solution

    The electron-withdrawing inductive effect of halogen decreases the electron density on nitrogen, and lowers the basic strength. Since fluorine is the most electronegative, NF3 is the least basic.

     

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