1(i)
A non-metal which reacts with concentrated sulphuric acid to form two gases which turn lime water milky is ............... .
- (a)Sulphur
- (b)Carbon
- (c)Oxygen
- (d)Nitrogen
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Carbon
Reason — Carbon (a non-metal) reacts with hot concentrated sulphuric acid to form two gases — carbon dioxide (CO2) and sulphur dioxide (SO2). Both these gases turn lime water milky.
C + 2H2SO4 [conc.] ⟶ CO2 + 2H2O + 2SO2