Verbal Reasoning - Mental Ability Questions

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

Grandfather

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

SUN, TWQ, UYT, VAW, ?

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

BDE, HJK, NPQ, ?

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

FN, KL, PJ, ?, ZF

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

RMT, PKR, NIP, ?, JEL

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

VXK, QSF, LNA, GIV, ?

In the following series, one letter is missing as shown by the ?. Select the missing letter from the given options.

N, L, J, H, ?

In a certain code language, '+' represents 'x', '-' represents '+', 'x' represents '÷' and '÷' represents '-'. What is the answer to the following question?
72 x 9 - 14 + 2 = ?