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The p-Block Ele...

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  • Question 1
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    Calcium cyanide on treatment with steam under pressure gives $$NH_{3}$$ and

  • Question 2
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    In the Ostwald's process for the manufacture of $$HNO_{3}$$, the catalyst used is

  • Question 3
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    Calcium cyanamide on treatment with steam produce

  • Question 4
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    Point out in which of the following properties oxygen differs from the rest of the members of its family (Group - $$VIA$$).

  • Question 5
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    Directions For Questions

    Phosphourus occurs in nature in the ferm of stable phosphate. (Animal bones also contain calucium p-hosphate (58%) The important minerals are 
    (i) Phosphorite,  $$ Ca_{2}(PO_{4})_{2} $$ (ii) Chloraptite,  $$ Ca_{3}(PO_{4})_{2} CaCl_{2} $$ ,
    (iii)Fluoraptite,  $$ Ca_{3}(PO_{4})_{2} CaF_{2} $$
    These are some deposits of nitrates and phosphates in earth's crust. Nitrates are more soluble in water. Nitrates are difficult to reduce under the laboratory conditions but microbes do ti easily compounds of phosporus and nitrogen are used as fertilizer.

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    Amongs the following which is not member of apatite family

  • Question 6
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    Ammonia gas is not prepared by

  • Question 7
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    Fill in the blanks :
    Potassium nitrate crystals on heating strongly yield potassium nitrite and ________ gas.

  • Question 8
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    Ammonia can be obtained by adding water to?

  • Question 9
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    Which is the most abundant element on the earth's crust among group $$15$$ elements?

  • Question 10
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    Oxygen gas is not produced from the following decomposition reaction :

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