In which of the following reactions, no...

In which of the following reactions, no change in gaseous volume occurs when measured at similar T and P?

Combination of `N_(2)` and `O_(2)` to give NO

Combination of `N_(2)` and `H_(2)` to form `NH_(3)`

Combustion of carbon to give `CO_(2)`

Combustion of carbon monoxide

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The correct Answer is:

A, C

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In which of the following reaction there is no change in valency

`2H_(2)O_(2) to 2H_(2)O+O_(2)`

`CaCO_(3) to CaO+CO_(2)`

`2H_(2)O to 2H_(2)+O_(2)`

`2HgO to 2Hg+O_(2)`

`Cu+ ZnSO_4 rarr CuSO_4 + Zn darr `

`Cu+ 2AgNO_3 rarr Cu(NO_3)_2 + 2Ag darr`

`Cu+FeSO_4 rarrr CuSO_4 + Fe darr`

`3Ag + AuCl_3 rarr 3AgCl + Au darr`

`BaO+O_(3)rarr BaO_(2)+O_(2)`

`PbS+4O_(3)rarr PbSO_(4)+4O_(2)`

`H_(2)O_(2)+O_(3)rarr H_(2)O+2O_(2)`

`2Hg+O_(3)rarr Hg_(2)O+O_(2)`