The periodic table is an arrangement of elements according to their?
Trả lời
(B)
Atomic number
2
A solid with higher melting and boiling points is likely to be?
Trả lời
(C)
An Electrovalent compound
3
Which of the following metals reacts slowly with cold water?
Trả lời
(C)
Calcium
4
which of the following elements has the highest ionization energy?
Trả lời
(C)
Flourine
5
The bleaching action of chlorine is through the process?
Trả lời
(D)
Oxidation
6
If 6.5g of magnesium ribbon reacts completely with Hydrochloric acid, how many grams of hydrogen gas would be liberated?
Mg(s) + 2 HCl(aq) --> MgCl 2(aq) + H 2(g)
[ H = 1.0, Mg = 24.0 ]
Trả lời
(A)
0.54g
7
Calcium and magnesium belong to the group of the periodic table because both?
Trả lời
(D)
have same number of valence electrons
8
Which of the substances is non-polar?
Trả lời
(A)
Bromine
9
Which of the following pairs of components have the same molecular mass?
[ H = 1.0, C = 12.0, O = 16.0 ]
Trả lời
(C)
Carbon (ii) Oxide and Ethene
10
When an equilibrium is established between dissolved and undissolved solutes, the solution is said to be?
Trả lời
(A)
Saturated
11
How many moles of carbon(iv)oxide contains 16.0g of oxygen?
[ C = 12.0, O = 16.0 ]
Trả lời
(D)
0.50 mol
12
Stoichiometry is based on the law?
Trả lời
(D)
conservation of mass
13
What is the percentage by mass of H in CH\(_3\)COOH ?
Trả lời
(C)
6.7%
14
Which of the following compounds has coordinate bonds in its structure?
Trả lời
(A)
Al\(_2\)Cl\(_6\)
15
The name of the compound CH\(_3\)C(CH\(_3\))\(_2\)CH\(_2\)CH\(_2\)CH\(_3\)
Trả lời
(D)
2,2 - dimethyl pentane
16
The properties of a good primary standard solution include the following except?
Trả lời
(B)
low molecular mass
17
What is the solubility of a salt X at 25ºC if the saturated solution of the salt contains 0.28g in 100cm\(^3\) of the solution in mol\dm\(^3\)?
[ X = 56.0g ]
Trả lời
(A)
0.05
18
Vinegar is an aqueous solution of?
Trả lời
(C)
ethanoic acid
19
which of the following solutions containing one mole per dm\(^3\) of the compound would have the lowest PH?
Trả lời
(B)
hydrochloric acid
20
A sample of air was bubbled into water. The PH of the water slowly changed from 7 to 6. Which of the following gases in the samples caused the change?
Trả lời
(A)
carbon(iv)oxide
21
The most suitable indicator for the reaction between NaOH and HCOOH is?
Trả lời
(D)
phenolphthalein
22
consider the following reaction equation: 2Al(OH)\(_3\) + 3H\(_2\)SO\(_4\) →Al\(_2\)(SO4)\(_3\)(aq)+6H\(_2\)O. How many moles of tetraoxosulphate(vi)acid is needed to produce 0.5mol of aluminium tetraoxosulphate(vi)?
Trả lời
(C)
1.5
23
which of the following pairs of substances has the highest heat of neutralization?
Trả lời
(A)
strong acid and strong base
24
When quicklime dissolves in water?
Trả lời
(B)
heat is evolved
25
If the value of ΔH is positive for a reaction, it means that the reaction is?
Trả lời
(B)
endothermic
26
Which of the following compounds is formed by the oxidation of ethanol?
Trả lời
(D)
CH\(_3\)CO\(_2\)H
27
What is the characteristic of the gas liberated when dilute hydrochloric acid is added to Iron(ii)sulphide?
Trả lời
(D)
turns lead(ii)ethanoate paper black
28
An organic compound contains 72% carbon, 12% hydrogen and 16% oxygen by mass. What is the empirical formula of the compound?
[ H = 1.0. C = 12.0, O = 16.0 ]
Trả lời
(B)
C\(_6\)H\(_{12}\)O
29
When excess chlorine is mixed with ethane at room temperature, the product formed is?
Trả lời
(A)
1,2-dichloroethane
30
which of the following reagents could be used to distinguish between propan-1-ol and propan-2-ol
Trả lời
(A)
H+ / K2Cr2O7
31
If a catalyst is added to a system, the temperature and the pressure remain constant, there would be no effect on the?
Trả lời
(D)
heat of reaction
32
consider the following reaction equation: 2NH\(_3 \) .+ 3Cl\(_2\) → N2 + 6HCl.
NH\(_3\) is acting as?
Trả lời
(A)
a reducing agent
33
The oxidation of chromium in Cr\(_2\)O\(_7)\(-2\) ?
Trả lời
(C)
+6
34
The process by which alkanoic acid reacts reversibly with alkanols is known as?
Trả lời
(B)
esterification
35
If the oxidation potential of Mg and Al are +2.37 volts and + 1.66 volts respectively, then the Mg would?
Trả lời
(D)
replace Al
36
consider the reaction represented by the following equation: 2SO\(_2\) + O\(_2\) ⇌ 2SO\(_3\)
A decrease in the pressure of the reaction would
Trả lời
(C)
shift the equilibrium position to the left
37
In a mixture of gases which do not react chemically together, the pressure of the individual gas is?
Trả lời
(D)
partial pressure
38
Biotechnology is applied in the?
Trả lời
(A)
treatment of sewage
39
which of the following organic compounds has the lowest boiling point?
Trả lời
(D)
( CH\(_3\) )\(_3\)
40
Consider the following reaction represented by the following equation:
C\(_2\)H\(_2\) \(^{H_2}_{→}\) X \(^{H_2}_{→}\) Y. X and Y respectively are?
Trả lời
(B)
ethene and ethane
41
Which of the following substances can be classified as heavy chemicals?
Trả lời
(B)
H\(_2\)SO\(_4\)
42
in Boyle's law?
Trả lời
(D)
T is constant, V varies inversely with P
43
Which of the following apparatus is NOT used in volumetric analysis?
Trả lời
(C)
Desiccator
44
One of the deductions from Rutherford's alpha particle scattering experiment is that?
Trả lời
(C)
nuclei of atoms are positively charged
45
The atoms of \(^{64}_{29}\)Cu and \(^{65}_{30}\)Zn have the same number of?
