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Atoms and Molecules · Jharkhand Board (JAC) STD 9 (Jharkhand - English Medium). 12 questions.

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12 questions · self-marked practice — reveal the answer and mark yourself.

Question 11 Mark
Fill in the following blanks with suitable words: The particle which is formed by the loss of electrons by an atom is called _________.
Answer
The particle which is formed by the loss of electrons by an atom is called Cation.
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Question 21 Mark
Fill in the following blanks with suitable words: The particle which is formed by the gain of electrons by an atom is called _________.
Answer
The particle which is formed by the gain of electrons by an atom is called Anion.
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Question 31 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 _________.
Answer
In a chemical reaction, the sum of the masses of the reactants and the products remains unchanged. This is called the law of conservation of mass.
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Question 41 Mark
Fill in the following blanks: $0.5$ mole of calcium element has a mass of ____________.
Answer
$0.5$ mole of calcium element has a mass of $20g$.
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Question 51 Mark
Fill in the following blanks: $1$ mole contains __________ atoms, molecules or ions of a substance.
Answer
$1$ mole contains $6 . 0 2 2 \times 1 0 ^ { 2 3 } \text { atoms, molecules or ions of a substance. }$
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Question 61 Mark
Fill in the following blanks: $60g$ of carbon element are ____________ moles of carbon atoms.
Answer
$60g$ of carbon element are 5 moles of carbon atoms.
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Question 71 Mark
Fill in the following blanks with suitable words: In water, the proportion of oxygen and hydrogen is _________ by mass.
Answer
In water, the proportion of oxygen and hydrogen is $8 : 1$ by mass.
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Question 81 Mark
Fill in the following blanks with suitable words: A potassium ion has positive change because it contains less _________ than __________.
Answer
A potassium ion has positive change because it contains less Electrons than protons.
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Question 91 Mark
Fill in the following blanks:
$64g$ of oxygen gas contains _________ Moles of oxygen atoms.
Answer
$64g$ of oxygen gas contains $4$ Moles of oxygen atoms.
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Question 101 Mark
Fill in the following blanks with suitable words: The particle which is formed by the loss or gain of electrons by an atom is called _________.
Answer
The particle which is formed by the loss or gain of electrons by an atom is called lon.
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Question 111 Mark
Fill in the following blanks: A mole represents an ____________ number of particles of a substance.
Answer
A mole represents an Avogadro number of particles of a substance.
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Question 121 Mark
Fill in the following blanks with suitable words: A sulphide ion has negative charge because it contains less ____________ than ____________.
Answer
A sulphide ion has negative charge because it contains less Protons than electrons.
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