A white compound P was dissolved in the water and electricity was passed through it resulting in the formation of gas Q. This gas was then passed through a slurry of another white compound R. The product obtained from this reaction is commonly used a germicide. P, Q and R respectively, are
(A) NaCI, CI2, Ca(OH)2
(B) Na2SO4, SO2, AI (OH)3
(C) NaHCO3, CO2, Na2CO3
(D) AICI3, CI2, AI(OH)3
