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Free download in PDF Chemical Technology General Knowledge Objective Type Questions & Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams. These short solved questions or quizzes are provided by Gkseries.
(21)
Select the correct statement
[A]
Electrolysis cell uses exothermic reactions to produce electrical energy
[B]
In the electrolysis cell the positive current flows from the positive electrode to the negative electrode outside the cell
[C]
Electrolysis cell uses electrical energy to produce endothermic chemical changes
[D]
In the electrolysis cell the positive current flows from the negative electrode to the positive electrode inside the cell
Answer: Electrolysis cell uses electrical energy to produce endothermic chemical changes
(22)
The flow of current is actually flow of
[A]
?-particles
[B]
?-particles
[C]
? -praticles
[D]
mesons
(23)
The degree of ionisation does not depend upon
[A]
nature of solvent
[B]
nature of solute
[C]
temperature
[D]
current strength
(24)
When the same quantity of electricity is passed through different solutions the amounts of different substances produced are proportional to
[A]
their atomic weight
[B]
their molecular weight
[C]
their equivalent weight
[D]
the square of their equivalent weight
Answer: their equivalent weight
(25)
The quantity of electricity required to deposit one gram equivalent of any substance is
[A]
one coulomb
[B]
one faraday
[C]
one ampere
[D]
one microfaraday
(26)
The percentage by volume of argon in the air is about
[A]
2.97%
[B]
0.94%
[C]
0.01%
[D]
0.00%
(27)
Nitrogen gas is used
[A]
as protective atmosphere to prevent oxidation in metal working and food preservation
[B]
for welding
[C]
for cutting of metals
[D]
as refrigerant
Answer: as protective atmosphere to prevent oxidation in metal working and food preservation
(28)
High purity oxygen is used for
[A]
welding
[B]
cutting of metals
[C]
medicinal purposes
[D]
all of the above
(29)
The liquefaction of gases in general is favoured at
[A]
low temperature and low pressure
[B]
low temperature and high pressure
[C]
high temperature and high pressure
[D]
high temperature and low pressure
Answer: low temperature and high pressure
(30)
The raw materials for the manufacature of calcium carbide are
[A]
limestone and coke
[B]
limestone and slaked lime
[C]
limestone and sand
[D]
limestone and caustic soda
Answer: limestone and coke
31
Acetylene is manufactured by
[A]
reacting calcium carbide with liquid water
[B]
Sachsse process
[C]
Wulff process
[D]
all of these ansers
Answer: all of these ansers
32
Which of the following reactions is an exothermic reaction?
[A]
CaO(s) + 3C(s) ?CaC2 + CO(g)
[B]
CaCO3(s) ? CaO(s) + CO2(g)
[C]
CaC2(s) + H2O(I) ? Ca(OH)2 + C2H2(g)
[D]
C(s) + CO2(g) ?2CO(g)
Answer: CaC2(s) + H2O(I) ? Ca(OH)2 + C2H2(g)
33
Which of the following reactions is an endothermic reaction?
[A]
C(s) + O2(g) ?CO2(g)
[B]
2C(s) + O2(g) ?2CO(g)
[C]
C(s) + H2O(I) ?CO(g) + H2(g)
[D]
CO(g) + 3H2(g) ?CH4(g) + H2O(g)
Answer: C(s) + H2O(I) ?CO(g) + H2(g)
34
The producer gas is mainly used in
[A]
petroleum refinery
[B]
fertilizer industry
[C]
steel industry
[D]
pharmaceutical industry
35
The producer gas is composed of
[A]
CO and CO2
[B]
CH4 and CO2
[C]
CH4 and C2H4
[D]
CO N2 and H2
36
Coke oven gas is composed of
[A]
CH4 CO2 and H2O
[B]
CO CH4 and N2
[C]
CO2 CO AND H2
[D]
H CO and CH2
37
The constituents of water gas are
[A]
CO and H2O
[B]
CO2 and N2
[C]
CO and H2
[D]
CO and N2
38
Producer gas is obtained by
[A]
thermal cracking of naphtha
[B]
passing steam and air through red hot coke
[C]
passing air through red hot coke
[D]
passing steam through red hot coke
Answer: passing air through red hot coke
39
Which one of the following reactions is not an exothermic
[A]
Absorption of sulphur troixide by 98.5% sulphuric acid
[B]
Oxidation of sulphur trioxide
[C]
Oxidation of sulphur to sulphur dioxide
[D]
Thermal dissociation of iron pyrites
Answer: Thermal dissociation of iron pyrites
40
The most efficient agent for the absorption of SO3 is
[A]
80% H2SO4
[B]
98.5% H2SO4
[C]
90% H2SO4
[D]
20% oleum
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