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P-Block Elements Test - 1

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

    Green house gas(es)is /are

    Solution

    Certain molecules absorb strongly in the infrared region and its presence in the atmosphere decreases the loss of heat from the earth by radiation. This global warming is called green house effect. Gases causing such effect are CO2 and freons (CF2Cl2)

     

  • Question 2
    1 / -0

    Phosphine is obtained, when

    Solution

    Red P does not react with alkali.

  • Question 3
    1 / -0

    Which of the following statements is (are) true?

    Solution

    CaC2 + N2 → CaCN2 + C
    Calcium cyanamide

    2C + O2 → 2CO; 2CO + O2→ 2CO2;

    C + O2 → CO2

     

  • Question 4
    1 / -0

    B(OH)3 is a / an

    Solution

    Boric acid is a Lewis acid with basicity equal to one 

    B(OH)3 + H2O ⇌ [B(OH)4]- + H+
    (Boric acid)

     

  • Question 5
    1 / -0

    On reaction with hypochlorite anion, Ammonia can form

    Solution

    2NH3 + OCl- → NH2.NH2 + H2O + Cl-

  • Question 6
    1 / -0

    Which of the following substances are not soluble in hot caustic soda,containing an excess of concentrated solution of bromine in water?

    Solution

    Cr(OH)3 and Al(OH)3 are soluble in hot caustic soda containing an excess of concentrated solution of water, while Mn(OH)3and Fe(OH)3 are insoluble in the same solution.

     

  • Question 7
    1 / -0

    Which of the following are sub – oxides ?

    Solution

    Both C3O2 , N2O are sub - oxides.

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