Modern's abc+ of SCIENCE CHEMISTRY FOR Class IX>Chapter 3 - Atoms and Molecules>Revision Exercise>Q 13

MEDIUM

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IMPORTANT

Earn 100

What is the mass of $1$ atom of sulphur?

Important Questions on Atoms and Molecules

EASY

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IMPORTANT

Modern's abc+ of SCIENCE CHEMISTRY FOR Class IX>Chapter 3 - Atoms and Molecules>Revision Exercise>Q 14

Which of the following is a tetra-atomic molecule?

$A) {CH}_{3} OH B) {CH}_{4} C) H_{2} O_{2}$

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

EASY

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IMPORTANT

Modern's abc+ of SCIENCE CHEMISTRY FOR Class IX>Chapter 3 - Atoms and Molecules>Revision Exercise>Q 15

Helium gas consists of single atoms. What mass of helium contains

6.022 \times 10^{23}

atoms?

EASY

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IMPORTANT

Modern's abc+ of SCIENCE CHEMISTRY FOR Class IX>Chapter 3 - Atoms and Molecules>Revision Exercise>Q 16

What is atomic mass unit?

EASY

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IMPORTANT

Modern's abc+ of SCIENCE CHEMISTRY FOR Class IX>Chapter 3 - Atoms and Molecules>Revision Exercise>Q 17

What is a molecule?

EASY

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IMPORTANT

Modern's abc+ of SCIENCE CHEMISTRY FOR Class IX>Chapter 3 - Atoms and Molecules>Revision Exercise>Q 18

What is the ratio by mass of nitrogen and hydrogen in ammonia?

EASY

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IMPORTANT

Modern's abc+ of SCIENCE CHEMISTRY FOR Class IX>Chapter 3 - Atoms and Molecules>Revision Exercise>Q 19

Give two examples of trivalent metal ions.

MEDIUM

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IMPORTANT

Modern's abc+ of SCIENCE CHEMISTRY FOR Class IX>Chapter 3 - Atoms and Molecules>Revision Exercise>Q 20

What is the chemical formula of calcium oxide?

HARD

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IMPORTANT

Modern's abc+ of SCIENCE CHEMISTRY FOR Class IX>Chapter 3 - Atoms and Molecules>Revision Exercise>Q 22

Which of the following has larger mass?

[N = 14, H = 1, C = 12]

(i) a mole of ammonia

({NH}_{3})

(ii) a mole of methane

({CH}_{4})