7. Which of these has the strongest dispersion (Londoll) a. Brz b. Clh C. 12 d.

Question

7. Which of these has the strongest dispersion (Londoll) a. Brz b. Clh C. 12 d. F2 8. What is the oxidation number of P in the POs3 anion? a. +3 b. +5 9. How many atoms are in 1.0 moles of water? a. 3 b. 6.02 x 102 c. 1.204 x 1024 d. 1.806 x 1024 10. Which is a good set of quantum numbers highest energy electron in potassium? ms Choice 0 0 1/2 0 11. What is the electronic configuration of phosphorous? 12. Which transition in the hydrogen atom will emit light with the shortest wavelength? a, n=2n-1 b, n=3n=1 d, n-4n-3 13. Which bond is the longest? a. HCl b. HF c. HI d. HBr 14. Which compound is not soluble in water? a. KI b. NH4CI c. BaS04 d. AgNO

Explanation / Answer

7. (c) I2 due high molecular weight

8. (b) + 5

PO43-

x + 4 ( - 2 ) = - 3

x - 8 = - 3

x = + 5

9. (d) 1.806 * 1024 atoms Because each molecule of water (H2O) has 3 atoms.

then, 1 mol of water has 3 * 6.02 * 1023

10.

(A) Highest electron in K is 4s1

so, n = 4 , l = 0 for s, ml = 0 , ms = + 1/2

11.

P (z = 15) E.C 1s2 2s2 2p6 3s2 3p3

12.

(b) n = 3 to n = 1

13.

(c) HI

14.

(c) BaSO4

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