1.

Both `CO_2 and SO_2`A. turns lime water milky, however on passing excess of the gas, the solution becomes clearB. are colourlessC. support the combustion of a burning magnesium ribbon.D. turns acidified `K_2Cr_2O_7` solution green.

Answer» Correct Answer - A::B::C
Both `SO_2` and `CO_2` turns lime water milky.
`Ca(OH)_2(aq)+CO_2(g)to CaCO_3(s)+H_2O(l)`
`Ca(OH)_2(aq)+SO_2(g)to CaSO_3(s)+H_2O(l)`
On passing excess of the gas, the solutions become clear.
`CaCO_3(s)+CO_2(g)+H_2O(l)toCa(HCO_3)_2(aq)`
`CaSO_3(s)+SO_2(g)+H_2O(l)toCa(HSO_3)_2(aq)`
Both `CO_2` and `SO_2` are colourless gas
Both `CO_2` and `SO_2` support the combustion of burning magnesium
`CO_2(g)+2Mg(s)to2MgO(s)+C(s)`
`SO_2(g)+2Mg(s)to2MgO(s)+S(s)`
Only `SO_2` turns `K_2Cr_2O_7//H^(+)` solution green.


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