A white compound P was dissolved in the water and electricity was passed through it resulting in the formation of gas Q.

Hi, I have a question and I hope anyone could answer it:

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

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