The periodic table is an arrangement of elements according to their?
Відповідь
(B)
Atomic number
2
A solid with higher melting and boiling points is likely to be?
Відповідь
(C)
An Electrovalent compound
3
Which of the following metals reacts slowly with cold water?
Відповідь
(C)
Calcium
4
which of the following elements has the highest ionization energy?
Відповідь
(C)
Flourine
5
The bleaching action of chlorine is through the process?
Відповідь
(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 ]
Відповідь
(A)
0.54g
7
Calcium and magnesium belong to the group of the periodic table because both?
Відповідь
(D)
have same number of valence electrons
8
Which of the substances is non-polar?
Відповідь
(A)
Bromine
9
Which of the following pairs of components have the same molecular mass?
[ H = 1.0, C = 12.0, O = 16.0 ]
Відповідь
(C)
Carbon (ii) Oxide and Ethene
10
When an equilibrium is established between dissolved and undissolved solutes, the solution is said to be?
Відповідь
(A)
Saturated
11
How many moles of carbon(iv)oxide contains 16.0g of oxygen?
[ C = 12.0, O = 16.0 ]
Відповідь
(D)
0.50 mol
12
Stoichiometry is based on the law?
Відповідь
(D)
conservation of mass
13
What is the percentage by mass of H in CH\(_3\)COOH ?
Відповідь
(C)
6.7%
14
Which of the following compounds has coordinate bonds in its structure?
Відповідь
(A)
Al\(_2\)Cl\(_6\)
15
The name of the compound CH\(_3\)C(CH\(_3\))\(_2\)CH\(_2\)CH\(_2\)CH\(_3\)
Відповідь
(D)
2,2 - dimethyl pentane
16
The properties of a good primary standard solution include the following except?
Відповідь
(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 ]
Відповідь
(A)
0.05
18
Vinegar is an aqueous solution of?
Відповідь
(C)
ethanoic acid
19
which of the following solutions containing one mole per dm\(^3\) of the compound would have the lowest PH?
Відповідь
(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?
Відповідь
(A)
carbon(iv)oxide
21
The most suitable indicator for the reaction between NaOH and HCOOH is?
Відповідь
(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)?
Відповідь
(C)
1.5
23
which of the following pairs of substances has the highest heat of neutralization?
Відповідь
(A)
strong acid and strong base
24
When quicklime dissolves in water?
Відповідь
(B)
heat is evolved
25
If the value of ΔH is positive for a reaction, it means that the reaction is?
Відповідь
(B)
endothermic
26
Which of the following compounds is formed by the oxidation of ethanol?
Відповідь
(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?
Відповідь
(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 ]
Відповідь
(B)
C\(_6\)H\(_{12}\)O
29
When excess chlorine is mixed with ethane at room temperature, the product formed is?
Відповідь
(A)
1,2-dichloroethane
30
which of the following reagents could be used to distinguish between propan-1-ol and propan-2-ol
Відповідь
(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?
Відповідь
(D)
heat of reaction
32
consider the following reaction equation: 2NH\(_3 \) .+ 3Cl\(_2\) → N2 + 6HCl.
NH\(_3\) is acting as?
Відповідь
(A)
a reducing agent
33
The oxidation of chromium in Cr\(_2\)O\(_7)\(-2\) ?
Відповідь
(C)
+6
34
The process by which alkanoic acid reacts reversibly with alkanols is known as?
Відповідь
(B)
esterification
35
If the oxidation potential of Mg and Al are +2.37 volts and + 1.66 volts respectively, then the Mg would?
Відповідь
(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
Відповідь
(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?
Відповідь
(D)
partial pressure
38
Biotechnology is applied in the?
Відповідь
(A)
treatment of sewage
39
which of the following organic compounds has the lowest boiling point?
Відповідь
(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?
Відповідь
(B)
ethene and ethane
41
Which of the following substances can be classified as heavy chemicals?
Відповідь
(B)
H\(_2\)SO\(_4\)
42
in Boyle's law?
Відповідь
(D)
T is constant, V varies inversely with P
43
Which of the following apparatus is NOT used in volumetric analysis?
Відповідь
(C)
Desiccator
44
One of the deductions from Rutherford's alpha particle scattering experiment is that?
Відповідь
(C)
nuclei of atoms are positively charged
45
The atoms of \(^{64}_{29}\)Cu and \(^{65}_{30}\)Zn have the same number of?
