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(a) You have the following substances : ...

(a) You have the following substances :
`NH_(3), O_(2), Pt and H_(2)O`. Write equations for the preparation of
`N_(2)O` from these substances.
(b) Considering the fact that `N_(2)` makes up about 79% of the atmosphere,
why don't animals use the more abundant
`N_(2)` instead of `O_(2)` for biological reactions.

Text Solution

Verified by Experts

(a) `{:(4NH_(3)(g)+5O_(2)(g)underset(1100 K)overset(Pt)(rarr)4NO (g) + 6 H_(2)O(l),,,2NO (g)+O_(2)(g) rarr 2NO_(2)(g)),(3NO_(2)(g)+H_(2)O(l) rarr 2HNO_(3)(aq)+NO(g),,,NH_(3)(g)+HNO_(3)(aq) rarr NH_(4)NO_(3) (aq)),(NH_(4)NO_(3)(aq)underset("at room temperature")overset("Vacuum evaporation")rarr NH_(4)NO_(3)(s),,,NH_(4)NO_(3)(s)overset(523 K)rarr N_(2)O(g) + 2H_(2)O (l)):}`
(b) Animals need large amount of energy to move around and maintain the body temperature. Therefore, to obtain the required energy, it is much easier for them to break weaker double bond (493.4 kJ `mol^(-)`)of `O_(2)` than breaking the much stronger triple bond (941.4 kJ `mol^(-)`) of `N_(2)`.
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Explore conceptually related problems

A certain element is a metalloid that forms an acidic oxide, E_2 O_5 . Indentify the element. (b) N_2 makes up about 79 % of the atmosphere, why do not animals use the more abundant N_2 instead of O_2 for the biological processes ?

The gases H_(2),N_(2) , O_(2) and NH_(3) will diffuse in the order :

In the preparation of P_(4)O_(6) , a mixture of N_(2) and O_(2) is used rather than pure O_(2) , why ?

The main products formed by the reaction of N_(2)O_(5) and H_(2)O_(2) are

underline(N)O+H_(2)O to No reaction

underline(N_(2))O_(3)+H_(2)O to HNO_(2)

underline(N_(2))O+H_(2)O to No reaction

Knowledge Check

  • The gases H_(2),N_(2) , O_(2) and NH_(3) will diffuse in the order :

    A
    `H_(2) gt N_(2) gt O_(2) gt NH_(3)`
    B
    `NH_(3) gt O_(2) gt N_(2) gt H_(2)`
    C
    `H_(2) gt N_(2) gt NH_(3) gt O_(2)`
    D
    `H_(2) gt NH_(3) gt N_(2) gt O_(2)`

  • In the preparation of H_(2)O_(2) by auto oxidation method the starting substance is

    A
    2-ethyl anthra quinone
    B
    2-ethyl anthra quinol
    C
    p-benzo quinone
    D
    N-methyl aniline

  • The main products formed by the reaction of N_(2)O_(5) and H_(2)O_(2) are

    A
    only `HNO_(3)`
    B
    `HNO_(3) + O_(3)`
    C
    `HNO_(3) +HNO_(4)`
    D
    `HNO_(3) + HNO_(2)`