[Vocabulary] People with qualification are more likely to find work.

[yi-ing]

Which one is correct? I have difficulty using singular or plural form of a noun.

People with qualification are more likely to find work.
People with qualifications are more likely to find work

 

[emsr2d2]

The second is correct. The first would be grammatical if you added the indefinite article before "qualification".

 

[arjitsharma]

In that case, can I say?
Adam, go buy the sunscreen instead of saying, go buy a sunscreen

 

[emsr2d2]

In that case, can I say (no question mark here) "Adam, go buy the sunscreen" instead of saying (no comma here) "Go buy a sunscreen"?

See my corrections above. It's important to mark out the sentences you are asking us to choose between by enclosing them in quotation marks.

"Adam, go [and] buy the sunscreen" is OK if Adam knows exactly which sunscreen you're talking about. It would probably have been discussed already. If you don't care which one he buys, use "Adam, go [and] buy sunscreen" (no article at all because "sunscreen" here is uncountable).
"Go [and] buy a sunscreen" is incorrect. If you want to use the indefinite article, you need to say "Go [and] buy a bottle/tube/lot of sunscreen".

Note that the "and" which I enclosed in square brackets is required in BrE. I believe it's optional in AmE.