chapter qa

Question 1

Calcium

Answer 1

White precipitate form, insoluble in excess naoh
Ammonia: no precipitate form

Question 2

ZInc

Answer 2

Addition of hydroxide
white preciptate form, soluble in excess to form colourless solution

ammonia: white precipitate form, soluble in excess to form colourless solution

Question 3

Aluminium

Answer 3

Addition of hydroxide
white preciptate form, soluble in excess to form colourless solution

Ammonia
White precipitate, insoluble in excess

Question 4

Copper

Answer 4

Light blue precipitate, insoluble in excess.

Ammonia:
Light blue precipitate, soluble in excess to form dark blue solution

Question 5

Iron (II)

Answer 5

Green precipitate, insoluble in excess

Green precipitate, insoluble in excess

Question 6

Iron (III)

Answer 6

Reddish brown precipitate, insoluble in excess

Reddish-brown precipitate, insoluble in excess

Question 7

NH4+

Answer 7

No visible reaction, but warming will release ammonia gas which turn red moist litmus paper blue