Copper metal will react with concentrated trioxonitrate (V) acid to give?
Trả lời
(D)
Cu(NO3)2 + 2NO2 + 2H2O
2
Which of the following separation is routinely applied in the petroleum industry
Trả lời
(E)
Fractional distillation
3
Starch undergoes complete hydrolysis to produce
Trả lời
(D)
glucose
4
Which of the following solids has a network structure?
Trả lời
(A)
Diamond
5
Trioxosulphate (lV) acid is not stored for a long period because it
Trả lời
(C)
is unstable and eaily decomposed
6
Alkanes are used mainly
Trả lời
(B)
as domestic and industrial fuels
7
Which of the following pairs illustrates isotopy?
Trả lời
(D)
Hydrogen and deuterium
8
Carbon is often deposited in the exhaust-pipe of cars because of the?
Trả lời
(C)
incomplete combustion of petrol
9
What does X atand for in the following expression? X = Log(10)(H+)
Trả lời
(D)
Degree of acidity (pH)
10
Sulphur burns in air to form
Trả lời
(A)
an acidic oxide
11
In which of the following changes is ∆S negative ?
Trả lời
(A)
H2O(l) → H2O(s)
12
Chlorine is is used in water treatment as
Trả lời
(A)
a germicide
13
Which of the following pieces of deposited if a current of 10A was passed through a solution of copper(ll) salt for 965 seconds? (1F = 96500 C)
Trả lời
(C)
0.05 mole
14
Some precious stones such as ruby and sapphire consist of aluminum oxide coloured by traces of the oxides of
Trả lời
(C)
transition metals
15
Consider the reaction represented by the following equation CaCI2(aq) + H 2C2O 4(aq) ⇌ CaC 2O4(s) + 2HCI(aq). Which of the following would dissolve the precipitate of CaC 2O4 formed?
Trả lời
(D)
Adding concentrated hydrochloric acid
16
The following gases decolorize bromine water except
Trả lời
(A)
C2H6
17
What volume of distilled water should be added to 400cm3 of 2.0 mole dm-3 \(H_{2}SO_{4}\) to obtain 0.20 mole dm-3 of solution>
Trả lời
(D)
3,600cm-3
18
Which of the following indicates the correct increasing order of oxidizing power of the halogens?
Trả lời
(B)
l < Br < CI < F
19
Which of the following substances is a peroxide?
Trả lời
(A)
Na2O2
20
The component of air that removed when air is bubbled into alkaline pyrogallol solution is
Trả lời
(B)
oxgyen
21
Which of the following will not affect the degree of hardness in a sample of temporarily hard water?
Trả lời
(D)
Filtration
22
Examples of polymers include the following except
Trả lời
(E)
glass
23
When the trioxonitrate (IV) salt of an alkali metal Y is heated, the formula of the residue is
Trả lời
(B)
YNO2
24
Which of the following compounds of tin is a strong reducing agent?
Trả lời
(D)
SnH4
25
In which of the following pairs are both substances deliquescent?
Trả lời
(C)
CaCI2 and NaOH
26
Producer gas is a mixture of
Trả lời
(D)
nitrogen and carbon (ll) oxide
27
An alkene may be converted to an alkane by
Trả lời
(D)
hydrogenation
28
Which of the following gases are diatomic except
Trả lời
(B)
helium
29
Which of the following is correct about the electrons in the 1s orbital? They
Trả lời
(C)
are closest to the nucleus
30
The product of the reaction between ethanol and excess acidified K\(_2\)Cr\(_2\)O\(_7\) is
