Final Exam, Page 5 of 18 Dec 7, 2017 16. Using the incomplete equation below, id

Question

Final Exam, Page 5 of 18 Dec 7, 2017 16. Using the incomplete equation below, identify the net ionic equation that contains the correct precipitate. Ba(NO3)2(aq) + NayCO3(aq) BaCO,(?) + 2 NaNo, (2) A. Ba2+ (aq) +CO32-(aq)--Baco,(s) B. Na+ (aq) + NO3" (aq) NaNO3(s) C. Ba2+(aq) +NO (aq) +Na (ag)+CO, (a)Baco(s) +Na (ag)+ NO(aq) D. Ba2+(aq) + NO3_ (aq) + Na+(aq) + co,2-(aa) Ba2+(aq) + CO'-(aq) + NaNO,(s) 17. Identify the major ionic species present in an aqueous solution of K,so A. K2, SO,2 C. K+, S+, 042 D. K+so 18. The oxidation aumber of N in KNO, is A. +1 B. +3 C. +5 D.-1 19. In the following redox reaction which element is oxidized and which is reduced? A. H is oxidized and N is reduced B. N is oxidized and O is reduced C. Cl is oxidized and O is reduced D. N is oxidized and Cl is reduced E. Cl is oxidized and N is reduced 20. Which of the followin g represents a metal displacement reaction? A. 2 NaNs(s) 2Na(s) +3N2(g) B. Fe0a(6)+2A(s) 2 Fe(s) +Alg0(s) 16.

Explanation / Answer

16. option A. in case of option C and D, there are spectator ions and in B, the equation is not blanced. but in A, the proper ionic equation is given for precipitation.

17. D.

K2SO4 will dissociates to form 2K+ ions and SO42-

18. C

K = +1 state and O = -2 state.

so, +1 +x -2*3 = 0

or, x = +5

19. D

oxidation number of N ( NH3 is -3) increases (N2 is 0), so, N oxidized

and oxidation number of Cl (in ClO-...oxidation number is +1 ) decrease to -2 ( in CaCl2), so, Cl reduced

20. option B

option A is the decomposition not displacement reaction

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