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11th Chemistry first revision 2023

One word answer:

1. b) oxygen.
2. C) 4.42×10-18 J.
3. d) Be and Al.
4. b) CaNcn.
5. a) W= ◇u
6. c) both
7. C) ca(CN)
8. a) Both assertion and reason are true and reason is the correct explanation of assertion.
9. b) 3 4 2 1.
10. c) benzene.
11. c) steam distilation.
12. c) square pyramidal, sp3d2
13. c) d2 k33/k1
14. d) ethanol + water.
15. c) pent – 1 – ene.

Part: II

16. One mole:
    • One mole is the amount of substances of a system, which contains as many elementary particles are there are atoms in 2g of carbon-12-isotope.
17. Effective Nuclear charge:
    • The net nuclear charge is experienced by valence shell electrons of the outermost electrons, it is called net nuclear charege.
18. Compressibility factor:
    • Compressibility factor: PV/nRT.
19. Diffusion:
    • When two non reaction gases are allowed go mix. The product of gas which involves movement of a gas through another gas is called diffusion.
    • Effusion:
      • Effusion is an another process which gas escapes from a container through a small hole.
20. Principle:
    • No two electrons in an atom can have the same sets of values of all four quantum numbers.
      • Explanation:
    • Helium atom has two electrons. The four quantum number of one electron is n=1 l=1 m=0 s= +1/2 and other is n=1 l=1 m=0 s=-1/2.
      • Hence they have no same quantum number.