1.

An amorphous solid (X) burns in air to form a gas ( Y) which turns lime water milky. This gas decolourises aqueous solution of acidified KMnO_(4). Gas (Y) reacts with oxygen to give another gas (Z) which is responsible for acid rain. X, Y and Z are

Answer»

X-C, Y-CO, Z-`CO_2`
X-S, Y-`SO_2` , Z-`SO_3`
X-P , Y-`P_2O_3` ,Z - `P_2O_5`
X-S , Y-`SO_3` ,Z-`H_2SO_4`

Solution :`{:(S,+O_2,toSO_2),("(X)",,"(Y)"):}`
`{:(SO_2+,Ca(OH)_2to , CaSO_3 darr , + H_2O),("(Y)",,"white ppt.",):}`
`{:(2KMnO_4+,5SO_2+,2H_2OtoK_2SO_4+,2MnSO_4 +,2H_2SO_4),("Purple","(Y)",,"colourless",):}`
`{:(2SO_2+,O_2to,2SO_3),("(Y)",,"(Z)"):}`
`underset"(Z)"(SO_3) + H_2O to H_2SO_4` (responsible for ACID RAIN )


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