What does below chemistry rebus means?

Can you find out a way through which you can make five squares out of the given figure by moving just six match sticks?

Can you figure out the logic I used to decide the order of the following words:
gun, shoe, spree, door, hive, kicks, heaven, gate, line, den

Find The Next Number In The Sequence

30 10 15 13 0 16 -15 ?

Two in a corner, one in a room, zero in a house, but one in a shelter. What is it?

What number should come in place of the question mark below?

Make a sentence consisting of three words that have the whole alphabet.

Which wheel of car does not rotate when you turn your car right?

How is a fly different from a mosquito?

A new Engineering building containing 100 offices had just been completed. John was hired to paint the numbers 1 to 100 on the doors. How many times will John have to paint the number nine (9)?