Class 9

ATOMS AND MOLECULES question bank (Science)

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Q1.

Hydrogen and oxygen combine in the ratio of $1:8$ by mass to form water. What mass of oxygen gas would be required to react completely with $3 \,g$ of hydrogen gas (in $,g$)?

(A)
$18$
(B)
$24$
(C)
$9$
(D)
$36$
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Q2.

Which postulate of Dalton's atomic theory is the result of the law of conservation of mass?

(A)
Atoms are indivisible particles,which cannot be created or destroyed in a chemical reaction.
(B)
All atoms of a given element have identical properties,including identical mass.
(C)
Atoms combine in the ratio of small whole numbers to form compounds.
(D)
The relative number and kinds of atoms are constant in a given compound.
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