Of the bonds C-C, C=C, and C=C, the C=C bond is A) strongest/shortest B) stronge
ID: 536516 • Letter: O
Question
Of the bonds C-C, C=C, and C=C, the C=C bond is A) strongest/shortest B) strongest/longest C) weakest/longest D) weakest/shortest E) intermediate in both strength and length Write the symbols of top 20 elements in order. Identify each statement as true or false: (a) Cations are larger than their corresponding neutral atoms, (b) Li^+ is smaller than Li. (c) Cl- is bigger than I^-. Based on their positions in the periodic table, predict which atom of the following pairs will have the smaller first ionization energy: (a) Cl, Ar: (b) Be, Ca: Arrange the following oxides in order of increasing acidity. CO_2, CaO, Al_2 O_3, SO_3, SiO_2, P_2 O_5.Explanation / Answer
6. (a) Strongest and shortest
(7)
1. H = Hyderogen
2. He = Helium
3. Li = Litihium
4. Be = Beryllium
5. B = Boron
6. C = Carbon
7. N = Nitrogen
8. O = Oxygen
9. F = Fluorine
10. Ne = Neon
11. Na = Sodium
12. Mg = Magnesium
13. Al = Aluminium
14. Si = Silicon
15. P = Phosphorous
16. S = Sulphur
17. Cl = Chlorine
18. Ar = Argon
19. K = Potassium
20. Ca = Calcium
8)
(a) False
(b) True
(c) False
Reason: Cations are smaller than neutral atoms due to having less number of electrons.
Size of ions of same charge will increase in a gorup.
9)
(a) Cl
(b) Ca
Reason: Ionisation energy increases in a period but decreases in a group.
10)
CaO < Al2O3 < CO2 < SiO2 < SO3 < P2O5
Reason:
Acidic nature of oxides increases across a period and decreases down a group.
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