PIONEER JUNIOR COLLEGE - ASKnLearn

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18 0.267 g of a compound of chromium with general formula CrCl 3 .6H 2 O dissolves in
water to form an aqueous solution. When this solution is treated with excess of
aqueous silver nitrate, 0.144 g of silver chloride is precipitated.
Which of the following represents the structure of the chromium ion present in the
original compound?
A Cr 3+ (aq)
B [Cr(H 2 O) 5 Cl] 2+
C [Cr(H 2 O) 4 Cl 2 ] +
D [Cr(H 2 O) 6 ] 3+
19 In which of the following sets of reagents used does the transition metal compound
behave as a catalyst?
A
B
C
D
ethanal, copper(II) sulphate, sodium potassium tartrate, sodium hydroxide
ethene, sulfuric acid, potassium manganate(VII)
benzene, bromine, iron(III) bromide
phenol, iron(III) chloride
20 Which statement concerning transition metals is correct?
A They are the only metals which form complex compounds.
B They are the only metals with a complete 4s orbital in their atoms.
C They are the only metals which have more than one oxidation state.
D They are the only metals which give coloured ions in an aqueous solution.
21 How many stereoisomers are possible for the compound shown below?
C(CN)CH 3
HO
A 2 B 4 C 8 D 16