8)2 1, 3 2 20 Predict the formula of the ionic compound that forms from magnesiu

Question

8)2 1, 3 2 20 Predict the formula of the ionic compound that forms from magnesium and fluorine. 21. Which of the following are combustion reactions? 4) CHOI() +0, (g) CO2 (g) + H2O (1) A) 1 and 4 B) 1, 2, 3, and 4 C) 1, 3 and 4 D) 2. 3 and 4 E) 3 and 4 22. Based on the equations below, which metal is the most active? PhNoub (aq) + Ni (s) Nino, ) (aq) + Pb (s) Plooh (aq) + Ag (s) No reaction ano,)2 (aq) + Ag (s) No reaction A) Ni B) Ag C) Cu E)N 23. Combining aqueous solutions of Bal, and Na,SO, produces a precipitate of Baso. Which on s) islare spectator ions in the reaction? A) Ba only B) Na" ony D) Na" and 1 so," and I' 24 The F+F bond angle in the NF, molecule is slightly less than- A) 90 B)109.5 C) 120 D)180 25(2 Points) The Lewis structure of carbon monoxide is given below. The hybridizations of the carbon and oxygen atoms in carbon monoxide areandrespectively:Co:

Explanation / Answer

20. formula = MgF2

answer: E

21) answer: A . 1 and 4

22) among all , Ni reduction potential is less.so that it easily participates inoxidation.

answer: A

23) answer: D (spectator ions means, which do not participate in reaction)

24.) answer: B , (electronic geometry of NF3 is tetragedra, molecule shape is pyramidal.)

answer: D

25.)

Hyb = no of sigma bonds + no of lone pairs on central atom

   C = 1+1 = 2 = SP

   O = 1+1 = 2 = SP

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