Can you solve the tricky chess rebus puzzle below by ciphering the hidden meaning?

When I get multiplied by any number, the sum of the figures in the product is always me. What am I?

Forwards I am heavy, backward I am not. What am I?

Why is a river so rich ?

How can one talk without saying a single word?

Three people are in a room. Ronni looks at the Nile. The Nile looks at Senthil. Ronni is married but Senthil is not married. At any point, is a married person looking at an unmarried person? Yes, No or Cannot be determined.

Can you fill the blank with the correct number?

6 30 870 756030 _____

Which letter of the alphabet has the most water?

If nine thousand, nine hundred nine dollars is written as $9,909,
how should twelve thousand, twelve hundred twelve dollars be written?

What's the next in the series?

H, Be, F, S, Mn, Kr, In, Gd, Tl, ?