Which one of the following stain is used for staining of

The science of colours.

Find out the appropriate word.

DISPENSE

Find the word with the appropriate similar meaning of the word in Italic from the options given:

Malicious

SERENE

An ornament fastened to clothing with a hinged pin

A) dismal          B) Appellant           C) Plaintiff          D) Vile

Choose the word opposite in meaning to the given word.

Liberate

Select the option that can be used as a one-word substitute for the given group of words.

One who is not concerned with right or wrong