Which of the following is known as artificial silk? 

Read the following questions carefully and answer them. 

Polythene is polymer of

Starch in potatoes reacts with _____, turning to a blue colour. 

.______ is least reactive element belonging to group 17.

In the nucleus of Helium,

NaHCO3 is chemical formula for ___________.

In chemistry, soap is a salt of a ............

__________________ is a drug or substance that makes you feel relaxed and makes your body work and react more slowly.