Hypo is chemically:

(a) Na2S2O3.2H2O

(b) Na2S2O3.3H2O

(c) Na2S2O3.4H2O

(d) Na2S2O3.5H2O

Concept Videos :-

#3 | NaOH (Caustic Soda)
#4 | Na2CO3 (Sodium Carbonate), Gypsum & POP

Concept Questions :-

Some Important Compounds of Na
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