Can you place six X (crosses) in below board without making three in a row in any way ?

Solve the following series:
AZ, GT, MN, __, YB

It is deaf, Dumb and Blind!!!

Still, always tells the truth. What is it?

What does below chemistry rebus means?

If we change the South-East direction into North and North-East into West and all others similarly.
Can you find out which direction will be in the place of South-West direction?

Name a key which is hardest to turn.

At my favorite fruit stand,
an orange costs 18,
a pineapple costs 27,
and a grape costs 15.
Using the same logic, can you tell how much a mango costs?

There is an English word that can be used up to four times in a row without modifying the spelling and form a valid grammatical sentence.

Do you know what word is that?

The following "Brain Bat" means Slow Down.
S
L
O
W

Using the same logic, can you tell us what does the following Brain Bat means ?
E
V
I
G

When you say goodbye, I am what you need to tie.
I come as a couple and go wherever you run.
Who am I?