Solve below rebus puzzle?

For this puzzle, you might have to find logic in something illogical. But hey, it's fun and a healthy little break from your strenuous puzzle-solving sessions.

Can you decipher the meaning in the following cluster of letters?

ITIT,NCENTCENT

The centre of the third figure is empty. What digit should fit inside?

You’ll find me on Mercury, Earth, Mars, Jupiter, Saturn, and Uranus. But never Neptune, or Venus. What am I?

Can you find the largest Three-digit number whose sum is 14 and whose square is less than 5,00,000?

If,

A + B = C
D - C = A
E - B = C

Based on the above equations, find out the answer for:

D + F = ?

What has many keys but can’t open a single lock?

In the picture, you can see a chess board. On the top left position, the K marks a knight. Now, can you move the knight in a manner that after 63 moves, the knight has been placed at all the squares exactly once excluding the starting square?

In a university, a professor gave a set of three problems to the three brilliant students of his class. See the image for the questions.

What is 3/7 chicken, 2/3 cat and 2/4 goat?