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Atoms and Molecules Science - Atoms and Molecules

Bihar Board (BSEB) - STD 9 - Science (BSEB - English Medium). 218 questions in this chapter.

Question types

Atoms and Molecules question types

218 questions across 7 question groups — pick any mix to generate a Science paper with step-by-step answer keys.

218
Questions
7
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 6true 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 7true 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 10Fill 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 23Que-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 30Que-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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