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Lesson: Tests for Transition Metals

Worksheet • 5 Questions

Q1:

When dissolved in water, the chloride of a first-row transition metal X reacts with dilute ammonia to form a pale green solid and with concentrated ammonia to form a blue solution. What is the identity of the element X ?

  • A N i
  • B C r
  • C C u
  • D F e
  • E C o

Q2:

When dissolved in water, which of the following transition metal chlorides does not react with sodium carbonate to produce a blue or green precipitate?

  • A C o C l 2
  • B C r C l 3
  • C N i C l 2
  • D F e C l 2
  • E C u C l 2

Q3:

When a reagent X is added to a strongly basic solution of chromium(III) nitrate, a yellow solution is produced.

What color is the original solution?

  • AGreen
  • BPink
  • CViolet
  • DOrange
  • EYellow

Which species produces the yellow color of the final solution?

  • A C r O 4 2
  • B H C r O 2 2
  • C H C r O 4
  • D C r O 2 7 2
  • E C r O 2 5 2

Which of the following is a possible molecular formula for the reagent X ?

  • A H O 2 2
  • B K M n O 4
  • C H S O 2 4
  • D N H 3
  • E Z n

What is the oxidation state of chromium in the final yellow solution?

Q4:

At pH 3, a dilute aqueous solution of iron(III) chloride is yellow in color.

Which species is mostly responsible for the color of this solution?

  • A [ F e ( H O ) O H ] 2 5 2 +
  • B [ F e C l ] 4
  • C [ F e ( H O ) ] 2 6 2 +
  • D [ F e ( H O ) C l ] 2 4 2 +
  • E [ F e ( H O ) ( O H ) ] 2 4 2 +

What change is observed if concentrated acid is added to this solution?

  • AA lilac solution is produced.
  • BA green solid precipitates.
  • CA green solution is produced.
  • DA lilac solid precipitates.
  • EAn orange solid precipitates.

If added to this solution, which of the following reagents would not react to form a solid material?

  • ASodium thiocyanate
  • BSodium sulfate
  • CAmmonia
  • DSodium carbonate
  • ESodium hydroxide

As the pH of the solution increases, what happens to the geometry of the transition metal complex and the frequency of the light absorbed?

  • AThe geometry of the complex is unchanged and lower-frequency light is absorbed.
  • BThe complex changes from tetrahedral to octahedral and lower-frequency light is absorbed.
  • CThe geometry of the complex is unchanged and higher-frequency light is absorbed.
  • DThe complex changes from octahedral to tetrahedral and higher-frequency light is absorbed.
  • EThe complex changes from octahedral to tetrahedral and lower-frequency light is absorbed.

Q5:

When a complex of vanadium reacts with zinc under acidic aqueous conditions, the color of the solution changes from blue to purple.

What is the structure of the original complex?

  • A [ V O ( H O ) ] 2 5 2 +
  • B [ V O ( H O ) ] 2 2 4 +
  • C [ V ( H O ) ] 2 6 2 +
  • D [ V O ( H O ) ] 2 2 4 2 +
  • E [ V ( H O ) ] 2 6 3 +

What is the oxidation state of vanadium in the final complex?

If the original vanadium complex is instead oxidized, what is the color of the resulting solution?

  • AYellow
  • BColorless
  • CBlue
  • DGreen
  • EPurple
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