What does below chemistry rebus means?

What is the word or phrase below?
R | E | A | D

What does the below rebus puzzle mean?

I am a word that begins with the letter “i.” If you add the letter “a” to me, I become a new word with a different meaning, but that sounds exactly the same. What word am I?

Can you complete the sequence?

192, 021, 222, 324, 252, 627, 2__, 9__?

I have no doors but I have keys, I have no rooms but I have space, you can enter but you can’t leave! What am I?

What does this rebus mean?

O
N
C
E
TIME

Christina, Allison and Lena are 3 daughters of John a well-known Mathematician, When I asked John the age of their daughters. He replied "The current age of her daughters is prime. Also, the difference between their ages is also prime."

How old are the daughters?

In the below-given picture of a pretty girl, there is something wrong. Can you find out what it is?

Akbar called Birbal and asked him to draw a line on the floor. He asked Birbal to make that line smaller without erasing it. Birbal smiled and did it before Akbar could blink his eyes.

How did he managed to do it?