Which of the following is not a property of trioxonitrate (V) salts?
Risposta
(D)
Production of effervescence with saturated Na2CO3 solution
4
Which of the following methods is suitable for the preparation of an insoluble salt?
Risposta
(B)
Double decomposition
5
What is the function of sulphur (IV) oxide in the reaction represented by the following equation? SO 2(aq) + 2H2S(g) → 3S (s) + 2H 2O (l)
Risposta
(B)
Oxidising agent
6
Which of the following will produce oxygen and hydrogen during its electrolysis using platinum electrode?
Risposta
(C)
Dilute sodium chloride solution
7
What mass of copper would be deposited by a current of 1. 0 ampere passing for 965 seconds through copper (ll) tetraoxosulphate (IV) solution? [Cu = 63.5; 1F = 96500C]
Risposta
(A)
0.318g
8
How many electrons are removed from Cr2- when it is oxidized to CrO42-?
Risposta
(D)
8
9
Substances which absorb water from the atmosphere without dissolving in it are sid to be
Risposta
(B)
hygroscopic
10
Pipe-borne water is usually chlorinated in order to
Risposta
(D)
kill harmful bacteria in the water
11
Which of the following can be added to dissolve the precipitate formed in the reaction represented by the following equation? CaCl2(aq) + H2C2O 4(s) ⇌ CaC 2O2
Risposta
(E)
Aqueous ammonia
12
The spontaneity of a chemical reaction is determined by the change in the
Risposta
(C)
free energy of the system
13
Two metallic ions commonly present in hard water are
Risposta
(C)
Mg2+ and Ca2+
14
Rusting of iron is an example of
Risposta
(D)
redox reaction
15
Aluminium is extracted from
Risposta
(C)
bauxite
16
Metals are said to be malleable because they
Risposta
(C)
can be beaten into sheets
17
A device used in the laboratory for intermittent production of gases without heating is
Risposta
(E)
Kipp's apparatus
18
Which of the following can undergo both addition reactions and substitution reactions?
Risposta
(A)
Benzene
19
The liquid product of the destructive distillation of coal is
Risposta
(C)
ammoniacal liquor
20
Which of the following alkanes has the highest boiling point?
Risposta
(E)
hexane
21
Petrol consists mainly of
Risposta
(C)
hydrocarbons
22
Dehydration of ethanol produces
Risposta
(C)
ethene
23
When alkanols react with sodium, the ga evolved is
Risposta
(A)
hydrogen
24
The products of the reaction between CH3CH 2COOH and CH3OH are H 2
O and
Risposta
(A)
CH 3CH2COOCH3
25
A positive reaction to Fehling's test indicates the presence of
