Determine the name for CoCl_2 middot 6H_2O. a) Cobalt chloride hydrate b) Cobalt

Question

Determine the name for CoCl_2 middot 6H_2O. a) Cobalt chloride hydrate b) Cobalt (I) chloride heptahydrate c) Cobalt chloride heptahydrate d) Cobalt (II) chloride hexahydrate e) Cobalt chloride Which of the following is the best reducing agent? Ni^2+ (aq) + 2 e^- rightarrow Ni (s) E degree = -0.23 V Zn^2+(aq) + 2 e^rightarrow zn (s) E degree = -0.76 V Ag^+ (aq) + e^- rightarrow Ag (s) E degree = 0.80 V a) Ni^2+ b) Ni c) Zn d) Ag e) Zn^2+ For a galvanic cell that uses the following two half-reactions, Cr_2O_7(aq) + 14 H^+(aq) + 6 e^- rightarrow 2 Cr^3+ (aq) + 7 H_2O(l) Pb(s) rightarrow Pb^2+(aq) + 2 e^- How many moles of Pb(s) are oxidized by three moles of Cr_2O^2-_7? a) 3 b) 6 c) 9 d) 18 Place the following in order of increasing radius. S^2- K^1+ F^I- a) S^2-

Explanation / Answer

Q1.

CoCl2 --> Cobal + Chloride so,

6H2O --< 6, hexa, H2O, hydrate

then

Cobalt (II) Chloride + hexahydrate

the answer is D

Q2.

best reducing agent is the one that oxidizes the best, form the list, must be the lowest potential

therefore, choose Zinc

Zn(s)

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