redox reactions

Question 1

what is the oxidising agent to oxidise Iron (II) to Iron (III)

Answer 1

H+/MnO4

Question 2

what is the reducing agent to reduce Iron (III) to (II)

Answer 2

excess potassium iodide - potassium ions are spectator ion

Question 3

what is the oxidising agent to oxidise Chromium (III) ion to CrO4 2-

Answer 3

hot alkaline hydrogen peroxide.

Question 4

what is the colour of CrO4 2-

Answer 4

bright yellow

Question 5

what is the reducing agent to reduce Cr2O7 2- to Cr3+

Answer 5

zinc (if in excess than will be reduced to Cr 2+)

Question 6

what is the reducing agent used to reduce Copper(II) to Copper (I)

Answer 6

excess KI (k+ ions are spectator)

Question 7

what is the reagent that causes a disproportionation reaction with copper (I)

Answer 7

hot dilute H2SO4

Question 8

what colour are Fe 2+ ions

Answer 8

pale green

Question 9

what colour are MnO4 - ions

Answer 9

purple

Question 10

what colour are Fe3+ ions

Answer 10

yellow

Question 11

what colour are Mn 2+ ions

Answer 11

pale pink

Question 12

what colour are I - ions

Answer 12

colourless

Question 13

what colour are Cr 3+ ions

Answer 13

violet

Question 14

what colour are CrO4 2- ions

Answer 14

bright yellow

Question 15

what colour are Cr2O7 2- ions

Answer 15

orange

Question 16

what colour are Cr 2+ ions

Answer 16

pale blue

Question 17

what colour precipitate is CuI

Answer 17

white

Question 18

what colour is Cu2O

Answer 18

black solid

Question 19

what colour is CuSO4

Answer 19

pale blue

Question 20

what colour is Cu

Answer 20

orange