Some oxidation reactions of methane are ...

Some oxidation reactions of methane are given below. Which of them is/are controlled oxidation reactions?

`CH_4 (g) +2O_2(g) to CO_2 (g) + 2H_2O (l)`

`CH_4(g) + O_2 (g) to C (s) + 2H_2O(l)`

`CH_4(g) + O_2(g) overset(Mo_2O_3)to HCHO + H_2O`

`2CH_4(g) + O_2 overset"Cu/523 K/100 atm"to 2CH_3OH`

Text Solution

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The correct Answer is:

C, D

Reaction (c ) and (d) in which `CH_4` does not undergo complete combustion to give `CO_2` and `H_2O` or incomplete combustion to C and `H_2O` are controlled oxidation reactions.

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Which of the following reaction is oxidation- reduction?

`H^(o+)+OH^(ɵ)toH_(2)O`

`(1)/(2)H_(2)+(1)/(2)Cl_(2)toHCl`

`CaCO_(3)toCaO+CO_(2)`

(a) and (c)

Which of the following reactions involves oxidation-reaction?

`H_(2)+Br_(2) rarr 2HBr`

`HBr+AgNO_(3) rarr AgBr+HNO_(3)`

`NaBr+HCl rarr NaCl+HBr`

`2NaOH+H_(2)SO_(4) rarr NaSO_(4)+2H_(2)O`

Which is the intramolecular oxidation-reduction reaction?

`2KClO_(3) rarr 2KCl+3O_(2)`

`(NH_(4))_(2)Cr_(2)O_(7) rarr N_(2)+CrO_(3)+4H_(2)O`

`PCl_(5) rarr PCl_(3)+Cl_(2)`

All of the above