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13 Dec 2019

Which of the following isoelectronic ions is smallest?

S2–; Cl–; K+; Ca2+; Sc3+

A. S2–

B. Ca2+

C. Cl–

D. K+

E. Sc3+

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Keith Leannon
Keith LeannonLv2
17 Dec 2019

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Related questions

A. Given the two reactions H2S⇌HS−+H+, K1 = 9.22×10−8, and HS−⇌S2−+H+, K2 = 1.09×10−19, what is the equilibrium constant Kfinal for the following reaction? S2−+2H+⇌H2S Enter your answer numerically.

B.

Given the two reactions

PbCl2⇌Pb2++2Cl−, K3 = 1.76×10−10, and

AgCl⇌Ag++Cl−, K4 = 1.23×10−4,

what is the equilibrium constant Kfinal for the following reaction?

PbCl2+2Ag+⇌2AgCl+Pb2+

Express your answer numerically.

Part A. Given the two reactions:

H2S⇌HS−+H+, K1 = 9.52×10−8,

HS−⇌S2−+H+, K2 = 1.18×10−19, what is the equilibrium constant Kfinal for the following reaction? S2−+2H+⇌H2S

Enter your answer numerically.

Part B. Given the two reactions:

PbCl2⇌Pb2++2Cl−, K3 = 1.87×10−10

AgCl⇌Ag++Cl−, K4 = 1.22×10−4

what is the equilibrium constant Kfinal for the following reaction? PbCl2+2Ag+⇌2AgCl+Pb2+

Express your answer numerically.

Part A)

Given the two reactions

H2S⇌HS−+H+, K1 = 9.46×10−8, and

HS−⇌S2−+H+, K2 = 1.24×10−19,

what is the equilibrium constant Kfinal for the following reaction? S2−+2H+⇌H2S

Part B)

Given the two reactions

PbCl2⇌Pb2++2Cl−, K3 = 1.79×10−10, and

AgCl⇌Ag++Cl−, K4 = 1.19×10−4,

what is the equilibrium constant Kfinal for the following reaction?

PbCl2+2Ag+⇌2AgCl+Pb2+

Express your answer numerically.

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