QA Analysis

Question 1

What salts are white?

Answer 1

Salts containing Na, K, Ca, Mg, Al, Zn, NH4. They dissolve to form a colourless solution

Question 2

What are the colours of CuSO4 and Cu(NO3)2?

Answer 2

Blue when hydrated and solution is blue

Question 3

What are the colours of CuCl2 and CuCO3?

Answer 3

Green and forms blue solution for the chloride (carbonate is insoluble)

Question 4

What are the colours for Fe (II) salts?

Answer 4

Green, dissolves to form green solution

Question 5

What are the colours for Fe (III) salts?

Answer 5

Brown, dissolves to form yellow solution

Question 6

What are the colours for PbO?

Answer 6

Brown when hot and yellow when cold

Question 7

What are the colours for CuO?

Answer 7

Black when solid (insoluble)

Question 8

What are the colours for ZnO?

Answer 8

Yellow when hot and white when cold

Question 9

What are the colours for PbCl2 and PbI2 respectively?

Answer 9

White for the chloride and yellow for the iodide

Question 10

Why is Zinc (II) Hydroxide and Copper (II) Hydroxide soluble in excess ammonia?

Answer 10

They form complex ions

Question 11

What colour is gaseous Francium?

Answer 11

Pale yellow

Question 12

What colour is Chloride?

Answer 12

Yellow-green when gaseous, Pale yellow in concentrated aqueous solution

Question 13

What colour is Bromide?

Answer 13

Reddish brown when in the gaseous and liquid state, and Orange in concentrated aqueous solution (yellow when dilute)

Question 14

What colour is Iodide?

Answer 14

Dark purple in gaseous state, Shiny black in solid state and pale yellow in water (brown when concentrated, turns blue-black due to triiodide ion)