Official NCERT Book for Class 10 Science: Chapter 05 Periodic Classification of Elements
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Multiple Choice Questions
1. (b) 2. (c) 3. (a) 4. (b)
5. (c) 6. (b) 7. (c) 8. (c)
9. (b) 10. (b) 11. (d) 12. (d)
13. (c) 14. (c) 15. (b) 16. (d)
17. (b) 18. (b) 19. (c) 20. (c)
21. (a) 22. (b) 23. (b) 24. (c)
25. (b) 26. (a)
Short Answer Questions
27. The arrangement of these elements is known as Do&&bereiner triad. Example, Lithium, Sodium and Potassium
28. (a) (i) F and Cl (ii) Na and K.
(b) Newland’s law of octaves
29. (a) No, because all these elements do not have similar properties although the atomic mass of silicon is average of atomic masses of sodium (Na) and chlorine (Cl). (b) Yes, because they have similar properties and the mass of magnesium (Mg) is roughly the average of the atomic mass of Be and Ca.
30. Hint— Elements with similar properties can be grouped together.
31. Hint— Hydrogen resembles alkali metals as well as halogens
32. GeCl4, GaCl3
33. Element Group No. Valency
A Group-13 3
B Group-14 4
C Group-2 2
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