Verbal Reasoning - Mental Ability Questions

From the given alternatives, select the word which CANNOT be formed using the letters of the given word.

Reapproachement

Rearrange the jumbled letters to make a meaningful word and then select the one which is different.

A series is given with one term missing. Select the correct alternative from the given ones that will complete the series.
DE, GI, KN, ?

A series is given with one term missing. Select the correct alternative from the given ones that will complete the series.

PIG, TMK, XQO, ?, FYW

A series is given with one term missing. Select the correct alternative from the given ones that will complete the series.

KNJ, NQM, QTP, TWS, ?

A series is given with one term missing. Choose the correct alternative from the given ones that will complete the series.

BC, JK, RS, ?

A series is given with one term missing. Select the correct alternative from the given ones that will complete the series.

ADG, ILO, QTW, ?

A series is given with one term missing. Choose the correct alternative from the given ones that will complete the series.

OP, ST, XY, DE, ?