How many methyl groups are present in butylated hydroxytoluene?

Consider the following statements:
Statement-$I$: Shaving soaps contain glycerol to prevent rapid drying.
Statement-$II$: Laundry soaps contain sodium rosinate or sodium silicate as fillers,not sodium carbonate.
Correct answer is:

Potassium metabisulphite is a(an)

When soap is dissolved in hard water,its cleaning ability decreases. This is due to the formation of:

Which cleansing agent gets precipitated in hard water?

Match List-$I$ with List-$II$ :

List-$I$ (Chemical)	List-$II$ (Used as)
$(a)$. Sucralose	$(i)$. Synthetic detergent
$(b)$. Glyceryl ester of stearic acid	$(ii)$. Artificial sweetener
$(c)$. Sodium benzoate	$(iii)$. Antiseptic
$(d)$. Bithionol	$(iv)$. Food preservative

Choose the correct match: