Which of the following statements is/are correct for 80 g of oxygen?

Q.

Read the following and select one the correct answer.

Statement I: Boron always forms covalent bond

Statement II: The small size of $B^{3+}$ favours formation of covalent bond

Q. The following question consist of two statements. Mark the answer as follows.
(A) If both statements are CORRECT, and Statement II is the CORRECT explanation of Statement I.
(B) If both statements are CORRECT, and Statement II is CORRECT the CORRECT explanation of Statement I.
(C) If Statement I is CORRECT, but Statement II is INCORRECT.
(D) If Statement I is INCORRECT, but Statement II is CORRECT.

Statement I: Molarity and molality for very dilute aqueous solution is approximately equal.
Statement II: For all aqueous solutions, total mass of solvent is approximately equal to total volume of solution.

Q.

Read the following and select one the correct answer.

Statement I: $P{b}^{4+}$ compounds are stronger oxidizing agents than $S{n}^{2+}$ compounds

Statement II: The higher oxidation states for the group 14 elements are more stable for the heavier members of the group due to inert pair effect.

Q. Consider the following structure (I), (II), (III) and (IV).

Which of the following statements is not correct?