What does below chemistry rebus means?

Guess the hidden movie name?

If,

6 / 7 = 2
3 / 9 = 7
8 / 2 = 6

Then

4 / 5 = ?

A little girl goes to the store and buys one dozen eggs. As she is going home, all but three break. How many eggs are left unbroken?

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

A mile-long train is moving at sixty miles an hour when it reaches a mile-long tunnel. How long does it take the entire train to pass through the tunnel?

Wednesday, Steve and Pam go to a restaurant to eat lunch. After eating lunch, they pay the bill. But Steve and Pam do not pay the bill. So…who does?

If "P" means "-", "Q" means "/", "R" means "+", and "S" means "*" then find the value of the following:

21 Q 7 R 9 S 10 P 13

Irene killed hundreds of people mercilessly and yet the police were not able to put her behind the bars. Why?

Two batsman each on 94 runs. Seven runs needed to win in last 3 balls. Both make 100*. How?