10a) What is the oxidation number of chromium in CrO3? 0 +2 +3 +4 +6 10b) What i

Question

10a) What is the oxidation number of chromium in CrO3?

0

+2

+3

+4

+6

10b) What is the oxidation number of hydrogen in H2?

0

+1

+2

-1

-2

10c) What is the oxidation number of sulfer in the sulfite ion, SO32- ?

0

+2

+4

+6

+8

10d) Combining aqueous solutions of which of the following pairs of compounds would cause a precipitate to form?

Li3PO4 and NH4NO3

NaI and KBr

K2SO4 and CrCl3

NiBr2 and AgNO3

10e) Which of the following, when reacted together, would produce a gas as one of the products of the reaction?

A. NaS and HCl

B. Li2CO3 and HCl

C. Na2S and NaOH

D. Ca(HCO3)2 and NaOH

E. Both A and B

Explanation / Answer

1) CrO3

oxidation state of Cr is x + 3*(-2) = 0

oxidation state is +6

2) H2

oxidation state of H is 0

3) NiBr2 (aq) + AgNO3 (aq)-----> AgBr (s) + NiNO3 (aq)

4) Li2CO3 (aq) + HCl (aq) -------> LiCl (aq) + CO2 (g) + H2O (aq)

    Na2S (aq) + HCl (aq) -------> NaCl (aq) + H2S (g)

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