In the Chess Board picture below white army is arranged. You need to add a black army on the board such that no piece is under any threat.
Note: Army comprised of 1 king, 1 queen, 2 rooks, 2 bishops, 2 knights, and 8 pawns.

What does below chemistry rebus means?

No matter how little or how much you use me, you change me every month. What am I?

Identify the hidden meaning behind this picture?

If you go to the movies and you're paying, is it cheaper to take one friend to the movies twice, or two friends to the movies at the same time?

The following sentence is false. The preceding sentence is true.
Are these two sentences true or false?

I am a type of word that is spelt incorrectly or used differently, on purpose for humour. What am I?
Hint 1: You can find me in a joke.
Hint 2: I am a play on words.

A California farmer owns a beautiful pear tree. He supplies the fruit to a nearby grocery store. The store owner calls the farmer to see how much fruit is available for him to buy. The farmer knows the main trunk has 24 branches. Each branch has exactly 12 boughs and each bough has exactly 6 twigs. Since each twig bears one piece of fruit, how many plums will the farmer be able to deliver?

What is the largest amount of money that you can possess in change and still if someone asks you for a dollar, you won't be able to give?

I live in a bowl. I can swim. I have a tail. I also have fins and big eyes. What am I?