Which implement is used to break hard pan in

Select the Venn diagram that best represents the relationship between the following classes: Oxygen, Hydrogen and Gases.

In a certain code language.

"book pen mouse computer" is coded as "er gh iu ev"

"keypad pen book bottle" is coded as "gh ty iu kl"

Select the correct combination of mathematical signs to sequentially replace the * signs and to balance the given equation.

17 * 4 * 6 * 2 * 4 = 9

What could be the code of "Purpose" in the given language?

Select the figure that will come next in the following figure-series. 

Statements:

I.  Some doctors are engineers.

II.  All engineers are lawyers.

Conclusions:

What should come in place of '?' in the given series?

-12, +24, -48, +96, ?, +384

Which of the following letter-clusters will replace the question mark (?) in the given series?

ZG, BD, CX, EO, FC, ?