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Important Questions

Mole Concept

Telangana Open School (TOSS) · Class 12 · Chemistry

Most important questions from Mole Concept for Telangana Open School (TOSS) Class 12 Chemistry board exam 2026. MCQs, short answer, and long answer questions with marks.

51 questions30 flashcards4 concepts

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51 Questions·
multiple choicemultiple correcttrue false

Sample Questions

1multiple choice
1 marks

Which of the following is the correct symbol for kilo?

Show answer

k

The symbol for the prefix 'kilo' is 'k'. For example, km for kilometer.

2multiple choice
1 marks

How many molecules are present in 1 mole of oxygen gas (O₂)?

Show answer

6.022 × 10²³

One mole of any substance contains Avogadro's number of particles, so 1 mole of O₂ has 6.022 × 10²³ molecules.

3multiple choice
1 marks

The atomic mass unit (amu) is defined as 1/12th the mass of which atom?

Show answer

Carbon-12

By international agreement, 1 amu is defined as 1/12th the mass of one carbon-12 atom.

4multiple choice
1 marks

What is the relative atomic mass of oxygen?

Show answer

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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Frequently Asked Questions

What are the important topics in Mole Concept for Telangana Open School (TOSS) Class 12 Chemistry?
Mole Concept covers several key topics that are frequently asked in Telangana Open School (TOSS) Class 12 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
How to score full marks in Mole Concept — Telangana Open School (TOSS) Class 12 Chemistry?
Understand the core concepts first, then work through the 51 practice questions available for this chapter. Revise formulas and definitions regularly, and use flashcards for quick recall before the exam.
How many important questions are there in Mole Concept?
There are 51 practice questions available for Mole Concept. These cover multiple question types including MCQs, short answer, and long answer questions.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

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