LIVING SCIENCE CHEMISTRY 9>Chapter 3 - Atoms and Molecules>EXERCISES>Q B

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9th CBSE

IMPORTANT

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The mass of one Avogadro's number of molecules is termed as molar mass.

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Important Questions on Atoms and Molecules

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9th CBSE

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LIVING SCIENCE CHEMISTRY 9>Chapter 3 - Atoms and Molecules>EXERCISES>Q B

The relative atomic mass of an element is equal to the mass number of one of its atoms.

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LIVING SCIENCE CHEMISTRY 9>Chapter 3 - Atoms and Molecules>EXERCISES>Q C

The valency of an element with atomic number 2 is_____.

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LIVING SCIENCE CHEMISTRY 9>Chapter 3 - Atoms and Molecules>EXERCISES>Q C

The number of atoms present in one molecule of a compound is called _____.

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LIVING SCIENCE CHEMISTRY 9>Chapter 3 - Atoms and Molecules>EXERCISES>Q C

The percentage by mass of hydrogen in

C_{7} H_{16}

is _____.

(16.0 % / 83.9 %)

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LIVING SCIENCE CHEMISTRY 9>Chapter 3 - Atoms and Molecules>EXERCISES>Q C

The number of atoms in

4.25

g

of

{NH}_{3}

is _____

\times 10^{23}

.

(6.022, 7.022, 9.022)

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LIVING SCIENCE CHEMISTRY 9>Chapter 3 - Atoms and Molecules>EXERCISES>Q C

The mass of one hydrogen atom is _____.

$A : 1.67 \times 10^{- 24} g B : 1.67 \times 10^{- 14} g C : 1.67 \times 10^{- 34} g$

(Enter your correct answer as $A, B or C$ )

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LIVING SCIENCE CHEMISTRY 9>Chapter 3 - Atoms and Molecules>EXERCISES>Q C

One mole of ${CO}_{2}$ contains _____ $\times 10^{23}$ atoms of carbon. $(5.02, 6.02, 7.02)$

(Write the answer upto two decimal places.)

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9th CBSE

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LIVING SCIENCE CHEMISTRY 9>Chapter 3 - Atoms and Molecules>EXERCISES>Q C

The mass of a single molecule of water is _____

\times 10^{- 23} g

.

(1.89, 3.69, 2.99)