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Atoms and Molecules Science - Atoms and Molecules

Maharashtra Board - STD 9 - Science (MSBSHSE - English Medium). 220 questions in this chapter.

Question types

Atoms and Molecules question types

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

220
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 3Fill In The Blanks.1 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 6MCQ1 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 7MCQ1 Mark
In hydrogen peroxide $\ce{(H_2O_2)}$, the proportion of hydrogen and oxygen by mass is:
  • A
    $1 : 8$
  • ✓
    $1 : 16$
  • C
    $8 : 1$
  • D
    $16 : 1$

Answer: B.

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Q 8MCQ1 Mark
The element having atomicity ‘four’ is most likely to be:
  • A
    Argon.
  • B
    Fluorine.
  • ✓
    Phosphorus.
  • D
    Francium.

Answer: C.

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Q 9MCQ1 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 10MCQ1 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 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 23Question Answer (3 Marks)3 Marks
Show by means of calculations that $5$ moles of $CO_2​​​​​​​$​​​​​​​ and 5 moles of $H_2O$ do not have the same mass. How much is the difference in their masses?
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Q 30Question Answer (5 Marks)5 Marks
In an experiment, $4.90\ g$ of copper oxide was obtained form $3.92\ g$ of copper. In another experiment, $4.55\ g$ of copper oxide gave, on reduction, $3.64\ g$ of copper. Show with the help of calculations that these figures verify the law of constant proportions.
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