Denigrade is to Devalue as Upgrade is to.......?

Exculpate is to Acquit as Precise is to........

Hear is to deaf as speak is to............

Choose the correct alternative for the given relation.

Chromite : Chromium : : llmenite : ?

Auger is related to Carpenter in the same way as Awl is related to.......

Choose the correct alternative for the word belongs to the same group.

Sitar : Guitar : Tanpura