CBSE Class 9 Chemistry Atoms and Molecules (Hard)

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Question 1 of 10

1. Question
Which of the following contains maximum number of molecules?
- \( 19 \mathrm{CO}_{2} \)
- \( 1 \mathrm{~g} \mathrm{~N}_{2} \)
- \( 1 \mathrm{~g} \mathrm{H}_{2} \)
- \( 1 \mathrm{~g} \mathrm{CH}_{4} \)
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Question 2 of 10

2. Question
A sample of NH3 molecule irrespective of source contains 82.35% Nitrogen and 17.65% of Hydrogen by mass. This data supports:
- Law of Conservation of Mass
- Las of Multiple Proportions
- Law of Definite Proportions
- Avogadro’s Law
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Question 3 of 10

3. Question
An element X is divalent and another element Y is tetravalent. The compound formed by these two elements will be:
- XY
- XY2
- X2Y
- XY4
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Question 4 of 10

4. Question
\(
\text { An element } X \text { has valency equal to } 3 \text { . What will be its formula with carbonate ions? }
\)
- \( \mathrm{X}_{2}\left(\mathrm{CO}_{3}\right)_{3} \)
- \( \mathrm{X}_{2} \mathrm{CO}_{3} \)
- \( \mathrm{X} \mathrm{CO}_{3} \)
- \( \mathrm{X}\left(\mathrm{CO}_{3}\right)_{3} \)
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Question 5 of 10

5. Question
Which is not represented by 1 mole of Nitrogen gas?
- \( 6.023 \times 10^{23} \text { atoms of } \mathrm{N}_{2} \)
- \( 6.023 \times 10^{23} \text { molecules of } \mathrm{N}_{2} \)
- \( 12.046 \times 10^{23} \text { atoms of } \mathrm{N}_{2} \)
- \( 28 \mathrm{~g} \text { of } \mathrm{N}_{2} \)
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Question 6 of 10

6. Question
Which of the following has the smallest number of molecules?
- \( 0.1 \text { moles of } \mathrm{CO}_{2} \)
- \( 3.4 \mathrm{~g} \text { of } \mathrm{NH}_{3} \)
- \( 2 \mathrm{~g} \text { of } \mathrm{H}_{2} \text { at STP } \)
- \( 16 \mathrm{~g} \text { of } \mathrm{O}_{2} \text { gas } \)
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Question 7 of 10

7. Question
\(
18 \mathrm{~g} \text { of water is electrolyse The weight of oxygen obtained is: }
\)
- \( 16 \mathrm{~g} \)
- \( 8 \mathrm{~g} \)
- \( 4 \mathrm{~g} \)
- \( 1 \mathrm{~g} \)
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Question 8 of 10

8. Question
The balancing of chemical equations is in accordance with:
- law of constant proportion
- law of conservation of mass
- Law of combining volumes
- Both a and c
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Question 9 of 10

9. Question
Which of the following is a correct statement:
- \( \mathrm{Na}_{2} \mathrm{~S} \text { is sodium sulphide, } \mathrm{Na}_{2} \mathrm{SO}_{3} \text { is sodium sulphite, } \mathrm{Na}_{2} \mathrm{SO}_{4} \text { is sodium sulphate } \)
- \( \mathrm{Na}_{2} \mathrm{~S} \text { is sodium sulphite, } \mathrm{Na}_{2} \mathrm{SO}_{3} \text { is sodium sulphide, } \mathrm{Na}_{2} \mathrm{SO}_{4} \text { is sodium sulphate } \)
- \( \mathrm{Na}_{2} \mathrm{~S} \text { is sodium sulphide, } \mathrm{Na}_{2} \mathrm{SO}_{3} \text { is sodium sulphate, } \mathrm{Na}_{2} \mathrm{SO}_{4} \text { is sodium sulphite } \)
- \( \mathrm{Na}_{2} \mathrm{~S} \text { is sodium sulphite, } \mathrm{Na}_{2} \mathrm{SO}_{3} \text { is sodium sulphite, } \mathrm{Na}_{2} \mathrm{SO}_{4} \text { is sodium sulphide } \)
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Question 10 of 10

10. Question
The formula of Calcium phosphate is:
- \( \mathrm{Ca}_{3}\left(\mathrm{PO}_{4}\right)_{2} \)
- \( \mathrm{CaPO}_{4} \)
- \( \mathrm{Ca}\left(\mathrm{PO}_{4}\right)_{2} \)
- \( \mathrm{Ca}_{2}\left(\mathrm{PO}_{4}\right)_{3} \)
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CBSE Class 9 Chemistry Atoms and Molecules (Hard)

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CBSE Class 9 Chemistry Atoms and Molecules (Hard)

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