Question

Can we say :There are two chemist's in my neighbourhood?

Answer 1

Those are Singular Nouns.

20 chemists

6 Bakers

Regular Singular Nouns form a plural by adding an "...s" or "...es" at the end. Using an apostrophe ... "Chemist's" makes it possessive.. but sting singular. To make a plural possessive the apostrophe goes at the end, after the "...s' "

Chemists'

Answer 2

the poster above is right. The bank, library or chemist are a type of business, so are singular. We say 'the butcher's / the baker's / the candlestick maker's' as shorthand for 'the butcher's / baker's / candlestick maker's shop'

Answer 3

you should read this article for you to understand the rules in using apostrophe in your sentences

http://www.slideshare.net/stephlowe91/ielts-grammar-training-rules-in-using-apostrophe