Older MCQs might not have the typical A, B, C,
D
choices. They
have choices 1, 2, 3, and a combination of them is the answer. Below is the key that maps such
combinations to the answer.
A
1, 2 and 3 are correct
B
1 and 2 only are correct
C
2 and 3 only are correct
D
1 only is correct
Define a hydrated substance as a substance that is chemically combined with water and an anhydrous substance as a substance containing no water
Describe the use of a flame test to identify the cations: (a) lithium, ( Li^+ ) (b) sodium, ( Na^+ ) (c) potassium, ( K^+ ) (d) calcium, ( Ca^{2+} ) (e) barium, ( Ba^{2+} ) (f) copper(II), ( Cu^{2+} )
Describe how changing the conditions can change the direction of a reversible reaction for: (a) the effect of heat on hydrated compounds (b) the addition of water to anhydrous compounds limited to copper(II) sulfate and cobalt(II) chloride
