Colours of chemical substances

Here is the list of colours of some chemical substances

Chemical substance Colour
Compounds of group I and II white
Iron(II)compounds pale green/light green
Iron (III) compounds reddish-brown
Copper (II) compounds blue (except the next)
Copper (II) oxide black
Copper (I) oxide red
Anhydrous copper(II) sulphate white
Copper(II) carbonate green
Lead (II) oxide brown/reddish-brown when hot, yellow when cold.
Zinc oxide white when cold, yellow when hot
Lead(II) chloride white
Lead (II) iodide yellow
Metals shiny silver(except the next)
Gold shiny yellow
Copper brown /reddish-brown
Sulphur yellow
Fluorine yellow
Chlorine greenish-yellow
Bromine red
Bromine vapour reddish-brown
Bromine solution orange
Iodine black
Iodine vapour purple
Iodine solution dark brown
Nitrogen dioxide brown/reddish-brown

You can study all the topics by clicking here
More specific topics related to this part are:
Questions
  1. A white solid compound, X, upon heating, decomposed to a reddish-brown gas, Y, and a colorless gas, Z that relights a glowing splint. When a solution of compound X was mixed with a solution of sodium chloride, a white precipitate, W, was formed. This precipitate was soluble in hot water.
    1. Identify the cation and anion present in compound X, and write the balanced chemical equation for the decomposition reaction.
    2. Write the chemical reaction between a solution of X and sodium chloride.
    3. What was the name of the gas Y.
  2. A white solid compound, X, upon heating, decomposed to produce a reddish-brown solid Y, and a colorless gas, W. The reddish-brown solid Y, when allowed to cool it turned yellow. When gas W was passed through limewater, a clear limewater turned milky.
    (a) Identify compound X, and write the balanced chemical equation for the decomposition reaction.
    (b) What precaution was taken to ensure that limewater remains clear before the test?
    (c) Identify the name of the gas W.
    (d) Write the balanced chemical equation for the reaction that occured when the gas W was tested.

    3. Please visit other topics by clicking here