What is the longest word in the dictionary?

Christina has four daughters, and each of her daughters has a brother. How many children does Christina have?

The below mentioned letters have been placed in a order using a logic.

DEAD, BALL, FEAR, SHOP

Can you find the logic?

Find The Missing Number In the Sequence.
6 25 64 ? 32 1

Until it is measured, not known. Yet how you miss it when it has gone. What is it?

What has no start, end, or centre?

Can you make numbers like 24, using numbers 3,3,7 & 7 with any arithmetic operator?

There is one thing that goes round the house and also inside the house but never even share a brief touch. What is it?

I am eight letters long - "12345678"
My 1234 is an atmospheric condition.
My 34567 supports a plant.
My 4567 is too appropriate.
My 45 is a friendly thank-you.
My 678 is a man's name.

What word am I?

You are provided with a grid (as shown in the picture). Can you fill the squares with numbers 1-8 in a manner that none of the two consecutive numbers are placed next to each other in any direction (vertically, horizontally or diagonally?)