LIVING SCIENCE CHEMISTRY 9>Chapter 3 - Atoms and Molecules>Practice Questions>Q 12

MEDIUM

9th CBSE

IMPORTANT

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Write down the name of the compound represented by the formula $({NH}_{4})_{2} {SO}_{4}$ . (Ammonium sulphate/ Ammonium carbonate)

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Important Questions on Atoms and Molecules

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9th CBSE

IMPORTANT

LIVING SCIENCE CHEMISTRY 9>Chapter 3 - Atoms and Molecules>Practice Questions>Q 13

How many atoms are present in

H_{2} S

molecule?

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9th CBSE

IMPORTANT

LIVING SCIENCE CHEMISTRY 9>Chapter 3 - Atoms and Molecules>Practice Questions>Q 13

How many atoms are present in

{PO}_{4}^{3 -}

ion?

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9th CBSE

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LIVING SCIENCE CHEMISTRY 9>Chapter 3 - Atoms and Molecules>Practice Questions>Q 14

Define empirical formula and molecular formula. How are they related?

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9th CBSE

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LIVING SCIENCE CHEMISTRY 9>Chapter 3 - Atoms and Molecules>Practice Questions>Q 15

What is the significance of molecular formula?

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9th CBSE

IMPORTANT

LIVING SCIENCE CHEMISTRY 9>Chapter 3 - Atoms and Molecules>Practice Questions>Q 16

The following data are obtained when nitrogen and oxygen react together to form different oxides:

Mass of nitrogen	Mass of oxygen
a. $14 g$	$16 g$
b. $14 g$	$32 g$
c. $28 g$	$80 g$

Which law of chemical combination is obeyed by the above experimental data? Give the statement of the law.

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9th CBSE

IMPORTANT

LIVING SCIENCE CHEMISTRY 9>Chapter 3 - Atoms and Molecules>Practice Questions>Q 1

State and explain the law of constant proportions by giving an example.

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9th CBSE

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LIVING SCIENCE CHEMISTRY 9>Chapter 3 - Atoms and Molecules>Practice Questions>Q 2

Write the two postulates of Dalton's atomic theory that are modified on the basis of modern knowledge of the nature of matter.

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9th CBSE

IMPORTANT

LIVING SCIENCE CHEMISTRY 9>Chapter 3 - Atoms and Molecules>Practice Questions>Q 3

What are the drawbacks of Dalton's atomic theory?