Question 1

Just look at pic please it has the question and answers

Question 2

$\qquad\qquad\huge\underline{{\sf Answer}}$

Let's balance the given equation ~

$\qquad \sf  \dashrightarrow \:S_8 + O_2 \rightarrow SO_3$

$\textsf{Step 1 - balance Sulphur (S) on both sides}$

$\textsf{[ By multiplying}$
$\sf{SO_3}$
$\textsf{by 8 on product side ]}$

$\qquad \sf  \dashrightarrow \:S_8 + O_2 \rightarrow 8 \: SO_3$

$\textsf{Step 2 - balance Oxygen (O) on both sides}$

$\textsf{[ By multiplying}$
$\sf{O_2}$
$\textsf{by 12 on reactant side ]}$

$\qquad \sf  \dashrightarrow \:S_8 +12 \: O_2 \rightarrow 8 \: SO_3$

So, we can infer that the Correct choice is D

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