Mole Concept — Important Questions
Telangana Open School (TOSS) · Class 12 · Chemistry
51 important questions from Mole Concept for Telangana Open School (TOSS) Class 12 Chemistry, with answers. Written for the board exams 2027.
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Important Questions from Mole Concept
Which of the following is the correct symbol for kilo?
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k
The symbol for the prefix 'kilo' is 'k'. For example, km for kilometer.
How many molecules are present in 1 mole of oxygen gas (O₂)?
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6.022 × 10²³
One mole of any substance contains Avogadro's number of particles, so 1 mole of O₂ has 6.022 × 10²³ molecules.
The atomic mass unit (amu) is defined as 1/12th the mass of which atom?
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Carbon-12
By international agreement, 1 amu is defined as 1/12th the mass of one carbon-12 atom.
What is the relative atomic mass of oxygen?
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16
The relative atomic mass of oxygen is 16, meaning it is 16 times heavier than 1/12th the mass of a carbon-12 atom.
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