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Online Tests
ECAT Chemistry Chapter 14 Group IIIA & IVA Elements Online Test MCQs With Answers
Question # 1
Which of the following salt is used as purgative
Choose an answer
CaSO
4
MgSO
4
BeSO
4
NaCl
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Question # 2
______ is used in breathing equipments for mountaineers and in space craft
Choose an answer
Li
2
O
BeO
N
2
KO
2
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Question # 3
Phosphorus pentoxide finds use as
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An oxidizing agent
A reducing agent
A bleaching agent
A dehydrating agent
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Question # 4
Electron affinity of sulphur is
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More than O and Se
More than O but less than Se
Less than O but more than Se
Equal to O and Se
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Question # 5
Which of the following is the hardest metal among following
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Li
Na
Rb
K
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Question # 6
Silicon atom is hybridized:
Choose an answer
sp
sp
2
sp
3
dsp
2
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Question # 7
Which of the following compound is industrially prepared by the electrolysis of solution of NaCl
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Na
2
CO
3
NaHCO3
NaOH
NaOCl
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Question # 8
Borax is hydrated:
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Penta
Deca
Hepta
Octa
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Question # 9
All the elements of oxygen family are
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Non metals
Metalloids
Radioactive
Polymorphic
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Question # 10
Sulphuric acid has great affinity for water because
Choose an answer
It hydrolyses the acid
It decomposes the acid
Acid forms hydrates with water
Acid decomposes water
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Question # 11
Which one of the following is not an alkali metal
Choose an answer
Francium
Caesium
Rubidium
Radium
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Question # 12
Phosphine is not obtained by the reaction when
Choose an answer
White P is heated with NaOH
Red P is heated with NaOH
Ca
2
P
2
reacts with water
PH
4
l is boiled with water
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Question # 13
Which is not the form of silica?
Choose an answer
Amethyst quatz
Rose quatz
Smoky
None of these
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Question # 14
Basicity of orthoposphoric acid is
Choose an answer
2
3
4
5
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Question # 15
Which is used to remove air bubbles form metals?
Choose an answer
B
Be
Mg
Al
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Question # 16
The chemical formula of magnesite is
Choose an answer
MgCl
2
Mg(HCO
3
)
2
MgCO
3
None of these
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Question # 17
Crystalline form of sulphur stable at room temperature is
Choose an answer
Rhombic sulphur
Monoclinic sulphur
Plastic sulphur
Prismatic sulphur
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Question # 18
As a fixing agent in photography, sodium thisoulphate is used for
Choose an answer
Dissolving out unreacted silver bromide
Converting silver
Reducing solubility of AgBr
Preventing overdeveloping and fogging
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Question # 19
Which of the element is not alkali metal
Choose an answer
Lithium
Rubidium
Francium
Magnesium
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Question # 20
Red P can be obtained form white P by
Choose an answer
Heating it with a catalyst in an inert atmosphere
Distilling it in an inert atmosphere
Dissolving it in CS
2
and crysllizing
Melting it ad pouring the liquid into water
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Question # 21
Which of the following element is most reactive
Choose an answer
Li
Na
K
Cs
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Question # 22
When ammonia is heated with cupric oxide, a molecule of ammonia will
Choose an answer
Gain 3 electrons
Lose 3 electrons
Gain 2 electrons
Lose 2 electrons
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Question # 23
Marble is chemically
Choose an answer
CaCl
2
CaCO
3
Na
2
CO
3
NaHCO
3
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Question # 24
The chemical formula of Epson salt is
Choose an answer
MgSO
4
MgCl
2
MgSO
4
. 7H
2
O
MgCl
2
. 7H
2
O
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Question # 25
Which one of the following elements occurs free in nature?
Choose an answer
N
P
As
Sb
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Question # 26
The maximum number of electrons in the outermost shall of s-black elements is
Choose an answer
One
Two
Three
Four
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Question # 27
Ozone is not
Choose an answer
An allotrope
A powerful oxidizing agent
Paramagnetic
A bent molecule
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Question # 28
Chemical composition of colemnite is:
Choose an answer
Ca
2
B
6
O
11
.5H
2
O
CaB
4
O
7
.4 H
2
O
Na
2
B
7
O
7
. 4 H
2
O
CaNaB
5
O
9
.8H
2
O
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Question # 29
Which oxide of nitrogen is obtained on heating ammonium nitrate at 250
° C?
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Nitric oxide
Nitrous oxide
Nitrogen dioxide
Dinitrogen tetraoxide
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Question # 30
Francium is an element at the bottom of Group I in the Periodic Table. Which one of the following predication is likely to be correct?
Choose an answer
It will react with water to liberate oxygen
Its hydroxide will be a strong alkali in water
Its carbonate will decompose on heating to give carbon dioxide
Its nitrate on heating will give nitrogen dioxide and oxygen
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Question # 31
The formula of lime stone is
Choose an answer
CaCl
2
MgCO
3
Na
2
CO
3
CaCO
3
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