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
Describe tests using aqueous sodium hydroxide and aqueous ammonia to identify the aqueous cations: (a) aluminium, Al^3+ (b) ammonium, NH4^+ (c) calcium, Ca^2+ (d) chromium(III), Cr^3+ (e) copper(II), Cu^2+ (f) iron(II), Fe^2+ (g) iron(III), Fe^3+ (h) zinc, Zn^2+
Deduce the formula of an ionic compound from the charges on the ions
Describe and explain in terms of structure and bonding the properties of ionic compounds: (a) high melting points and boiling points (b) good electrical conductivity when aqueous or molten and poor when solid
