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MCQs on Atoms and Molecules
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MCQs on Atoms and Molecules
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15 Questions

1. 1 u or 1 amu means
2. The atomic mass of sodium is 23. The number of moles in 46g of sodium is ________.
3. An element X is divalent and another element Y is tetravalent. The compound formed by these two elements will be:
4. How many atoms of oxygen are present in 300 grams of CaCO3?
5. Which of the following statements is not true about an atom?
6. Which of the following correctly represents 360g of water? (i) 2 moles of water (ii) 20 moles of water (iii) 6.022 ×> 1023 molecules of water (iv) 1.2044 ×> 1025 molecules of water
7. A change in the physical state can be brought about
8. Which of the following represents a correct chemical formula?
9. Which of the following contains maximum number of molecules?
10. What is the formula mass unit of ZnO?
11. The molecular formula of potassium nitrate is ________.
12. A sample of NH3 molecule irrespective of source contains 82.35% Nitrogen and 17.65% of Hydrogen by mass. This data supports:
13. Which of the following represents the correct relation between Avogadro's number (No), number of particles (N) and moles (n)?
14. 3.42 g of sucrose are dissolved in 18 g of water in a beaker. The numbers of oxygen atoms in the solution are:
15. Molecular mass is defined as the:

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