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Atoms and Molecules Science - Atoms and Molecules

CBSE - STD 9 - Science (CBSE - English Medium). 438 questions in this chapter.

Question types

Atoms and Molecules question types

438 questions across 14 question groups — pick any mix to generate a Science paper with step-by-step answer keys.

438
Questions
14
Question groups
5
Question types
Sample Questions

Atoms and Molecules questions

One sample from each question group in this chapter. Select any group above to see the full set with answer keys.

Q 1M.C.Q. [1 M]1 Mark
The anion of an element has:
  • ✓
    More electrons than the normal atom.
  • B
    Less electrons than the normal atom.
  • C
    More protons than the normal atom.
  • D
    Same number of electrons as normal atom.

Answer: A.

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Q 2M.C.Q. [1 M]1 Mark
In hydrogen peroxide $ (H_2O_2),$ the proportion of hydrogen and oxygen by mass is:
  • A
    $1 : 8$
  • B
    $1 : 16$
  • C
    $8 : 1$
  • ✓
    $16 : 1$

Answer: D.

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Q 4M.C.Q. [1 M]1 Mark
The Latin language name of an element is natrium. The English name of this element is:
  • ✓
    Sodium.
  • B
    Potassium.
  • C
    Magnesium.
  • D
    Sulphur.

Answer: A.

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Q 5M.C.Q. [1 M]1 Mark
The atoms of which of the following pair of elements are most likely to exist in free state?
  • A
    Hydrogen and helium.
  • B
    Argon and carbon.
  • C
    Neon and nitrogen.
  • ✓
    Helium and neon.

Answer: D.

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Q 7M.C.Q-[Che-1M]1 Mark
Which of the following pair of elements represents a mole ratio of 1 : 1?
  1. 10g of calcium and 12g of magnesium.
  2. 12g of magnesium and 6g of carbon.
  3. 12g of carbon and 20g of calcium.
  4. 20g of sodium and 20g of calcium.
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Q 10M.C.Q-[Che-1M]1 Mark
Which of the following correctly represents 360g water?
  1. 2 moles of H2O.
  2. 20 moles 0f water.
  3. 6.022 × 1023 molecules of water.
  4. 1.2044 × 1025 molecules of water.
  1. (i)
  2. (i) and (iv)
  3. (ii) and (iii)
  4. (ii) and (iv)
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Q 11true or false1 Mark
State whether the following statements are true or false: A sodium ion has positive charge because it has more protons than a neutral atom.
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Q 12true or false1 Mark
State whether the following statements are true or false: A chloride ion has negative charge because it has more electrons than a neutral atom.
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Q 20Fill in the blank1 Mark
Fill in the following blanks with suitable words: In a chemical reaction, the sum of the masses of the reactants and the products remains unchanged. This is called _________.
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Q 45Que-Ans (Each of 3 Mark )3 Marks
Show by means of calculations that $5$ moles of $\mathrm{CO}_2$ and $5$ moles of $\mathrm{H}_2 \mathrm{O}$ do not have the same mass. How much is the difference in their masses?
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Q 50Answer the questions.[Che-3M]3 Marks
When 5g of calcium is burnt in 2g of oxygen, then 7g of calcium oxide is produced. What mass of calcium oxide will be produced when 5g of calcium is burnt in 20g of oxygen? Which law of chemical combination will govern your answer?
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Q 57Que-Ans (Each of 5 Mark )5 Marks
In an experiment, $4.90g$ of copper oxide was obtained form $3.92g$ of copper. In another experiment, $4.55g$ of copper oxide gave, on reduction, $3.64g$ of copper. Show with the help of calculations that these figures verify the law of constant proportions.
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