Class 9

ATOMS AND MOLECULES question bank (Science)

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Q1.

When $3.00 \,g$ of carbon is burnt in $8.00 \,g$ of oxygen,$11.00 \,g$ of carbon dioxide is produced. What mass of carbon dioxide will be formed when $3.00 \,g$ of carbon is burnt in $50.00 \,g$ of oxygen? Which law of chemical combination will govern your answer?

(A)

$11.00 \,g$ of $CO_2$,Law of Constant Proportions

(B)

$11.00 \,g$ of $CO_2$,Law of Conservation of Mass

(C)

$183.33 \,g$ of $CO_2$,Law of Multiple Proportions

(D)

$53.00 \,g$ of $CO_2$,Law of Constant Proportions

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Q2.

Calculate the number of molecules of sulphur $(S_8)$ present in $16 \, g$ of solid sulphur.

(A)

$5.59 \times 10^{23}$

(B)

$0.376 \times 10^{23}$

(C)

$37.6 \times 10^{23}$

(D)

$3.76 \times 10^{23}$

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