Which of the following statements about rare gases are correct?
คำตอบ
(A)
Their outermost shells are fully filled
3
Which of the following properties is characteristic of the halogens?
คำตอบ
(A)
Ability to accept electrons readily
4
In which of the following atoms is the ionic radius larger than the atomic radius? [11 Na, 12Mg,13AI,17CI]
คำตอบ
(B)
Chlorine
5
A transition metal would be expected to
คำตอบ
(A)
from oxides with different formulae
6
Which of the following properties of atoms generally increases down a group in the periodic table?
คำตอบ
(C)
Ionic radius
7
Which of the following statements about sodium is not true?
คำตอบ
(B)
Na is smaller in size than Na+
8
If the difference between the electronegativities of two elements is large, the type of bond that can be formed between them is
คำตอบ
(C)
ionic
9
Which of the following compounds has hydrogen bonds between its molecules?
คำตอบ
(A)
HF
10
Which of the following species does not contain a co-ordinate bond?
คำตอบ
(A)
AI2CI6
11
14.8 g of a salt (z)dissolved in 250 cm3 of distilled water gives a concentration of 0.80 mol dm-3. Calculate the molar mass of the salt (z).
คำตอบ
(D)
74.0 g mol-1
12
How many atoms are there in one mole of hydrogen gas? [Avogadro's constant = 6.02 x 1023mol-1]
คำตอบ
(C)
1.2 x10 24
13
What is the IUPAC name of the compound represented by the molecular formula NaCIO4?
คำตอบ
(D)
Sodium tetraoxochlorate(VII)
14
When air is successively passed through sodium hydroxide solution, alkaline pyrogallol and then concentrated tetraoxosulphate (VI) acid, its remaining components are
คำตอบ
(D)
nitrogen and noble gases
15
Which of the following gases is light than air?
คำตอบ
(D)
NH3
16
Which of the following statements is true of the molecules of a gas under ideal conditions? The molecules
คำตอบ
(A)
move at random
17
In which of the following compound (s) will heat be absorbed on adding water?
l. KNO\(_3\) II. Concentrated H\(_2\)SO\(_4\) III. NH\(_4\)CI
คำตอบ
(C)
l and lll only
18
Consider the reaction represented by the equation: Ca(OH)2(aq) + CO 2(g) → CaCO3(s) + H 2O(l)
in the reaction above, CO 2 acts as
คำตอบ
(A)
an acidic oxide
19
Which of the following compounds is a basic salt?
คำตอบ
(D)
Zn(OH)CI
20
What process is illustrated below? S(s) ⇌H2O⇌ S (aq)
คำตอบ
(C)
Formation of saturated solution of a solid
21
A solution of a salt X reacts with AgNO3 solution to give white precipitate which dissolves in excess aqueous ammonia. X contains
คำตอบ
(A)
CI-
22
Consider the reaction represented by the following equation: N2(g) + 3H2(g) ⇌ 2NH3(g); ∆H = - 92kJmol1. Finely divided iron is used as catalyst in the reaction in order to
คำตอบ
(C)
shorten the time for attainment of equilibrium
23
Which of these cell notations is the correct representation of a Daniell cell?
คำตอบ
(A)
Zn(s) / Zn2+(aq) // Cu2+(aq)/Cu(s)
24
What is the oxidation number of chromium in K2CrO4?
คำตอบ
(D)
+6
25
What product is formed at the cathode during the electrolysis of concentrated sodium chloride solution using carbon electrodes?
คำตอบ
(B)
Hydrogen
26
Which of the following substances is suitable solvent for perfumes?
คำตอบ
(B)
Ethanol
27
The complete hydrogenation of C 6
H 6 in the presence of nicked catalyst at 200oC gives
คำตอบ
(C)
C 6H 12
28
Which of the following pairs of substances can be distinguished by use of NaHCO3 solution?
คำตอบ
(B)
CH 3CH2OH and CH3COOH
29
Alkenes undergo the following reactions except
คำตอบ
(D)
substitution
30
Hydrocarbons which react with ammoniacal copper (l) chloride solution conform to the general molecular formula
คำตอบ
(D)
CnH2n-2
31
Consider the reaction below: Vegetable oil \(\frac{H2;NI catalyst}{High temperature}\) product. The reaction is applied in the manufacture of?
คำตอบ
(B)
margarine
32
Which of the following compounds reacts readily with sodium to liberate hydrogen?
คำตอบ
(B)
CH3COOH
33
Glucose reduces Fehling's solution on warming to
คำตอบ
(A)
copper (l) oxide
34
from the following ores is iron extracted? I. Haematite ll. Bauxite III. Magnetite IV. Cassiterite
คำตอบ
(B)
l and lll only
35
Which of the following methods can be used to separate a mixture of two miscible liquids with different boiling points?
