Genius! Can you solve this match stick puzzle?

Can You Solve This? 6div2(1+2)=

In the same diagram given above, what is the minimum number of extra match sticks needed so that by adding them at suitable places, five squares can be formed ?

A gas is evolved when Dil. Sulphuric Acid reacts with Zinc granules. It gives a pop sound when lit match stick is introduced near it. Identify the gas?

Directions : In the following questions, four alternatives are given for the Idiom/Phrase printed in bold in the sentence. Choose the alternative which best expresses the meaning of the Idiom/ Phrase. You have been trying to solve this puzzle for a long time, be careful so that you avoid barking up the wrong tree