What is the meaning of 'Herculean $task^{\prime}$?

1.Which of the following words is misspelt?

2.He is intent ¾ getting a good degree in Chemistry.

3.'Their is three mistake in this $sentence^{\prime} How many mistakes are there in this$ sentence?

4.What time ¾ news on television?

5.She ¾ her parents and got married.

6.Which one is the correct spelling?

7.¾ should pay more taxes.

8.I don't have any intention of ––– Politics.

9.The plural form of '$index^{\prime} is$ –––.

10.Electric wires should always be well –– with non-conductive material.

11.I explained him everything lest he ––– misunderstand me.

12.My brother specializes ––– Physics.