Chemistry in Everyday Life

Non-ionic detergents have groups at one end of the alkyl chain showing H-bonding include monoesters of polyhydric alcohols or polyethens derived from ethylene oxide. It is used as liquid dishwashing detergent. It remove grease and oil by micelle formation.

Both, assertion and reason are correct and given reason in the correct explanation of the assertion.

The chemicals which are used to protect food from microbes action i.e. which arrest the process of fermentation, acidification and any other decomposition of food are known as food preservatives. Table salt, sugar, vegetable oil, vinegar, sodium benzoate $\left(\mathrm{C}_6 \mathrm{H}_5 \mathrm{COONa}\right)$, sodium metabisulphite $\left(\mathrm{Na}_2 \mathrm{S}_2 \mathrm{O}_5\right)$, vitamin E. etc. are the common example of food preservatives.