What does below chemistry rebus means?

How many pluses should we put between the digits of 987654321 to get a total of 99, and where?

Find the hidden tiger in the given optical illusion ?

John is pretty weird. He likes toffees but hates chocolates. He loves books but never reads. He likes to build his troops in an online game but does not proceed with the war. He likes to go swimming but is afraid of water.

Seeking this behaviour, can you tell whether he likes balloons and parties?

Find the next number in the sequence

5 12 24 36 ?

How do you go from 98 to 720 using just one letter?

Christina is practising her dance steps along with her friends. In a particular sequence, all of them form a row. At that point, Niharika is standing in the 4th position from either end of the row.
Can you find out how many girls are practising together?

In an interview, a boy was asked an unusual question 'How two persons sitting with a table in between them can't see each other?' He was unable to reply. Can you?

A blonde put eyeliner on her head. Why?

I am a seven-letter word but if you remove four of my letters I will have one left. What word am I?