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Free download in PDF Chemical Technology General Knowledge Short 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.
41
Grignard reagent is
[A]
ethyl magnesium chloride
[B]
ethyl chloride
[C]
sodium sulphate
[D]
sodium cabonate
Answer: ethyl magnesium chloride
42
Potassium carbonate is not prepared by the Solvy process because
[A]
potassium bicarbonate is unstable
[B]
potassium bicarbonate is soluble is water
[C]
potassium bicarbonate is soluble in ammonium chloride and potassium chloride solutions
[D]
potassium bicarbonate does not decompose on heating
Answer: potassium bicarbonate is soluble in ammonium chloride and potassium chloride solutions
43
Washing soda is
[A]
Na2CO3.10H2O
[B]
Na2CO3
[C]
Na2CO3.H2O
[D]
Na2CO3.2H2O
44
Soda ash is also called
[A]
sodium carbonate
[B]
sodium hydroxide
[C]
sodium bicarbonate
[D]
sodium oxide
45
During the electrolysis of sodium chloride the anodic reaction is
[A]
oxidation of sodium ions
[B]
reduction of sodium ions
[C]
oxidation of chloride ions
[D]
reduction of chloride ions
Answer: oxidation of chloride ions
46
In a reduction process
[A]
oxidation number decreases
[B]
number of electrons decreases
[C]
oxygen content decreases
[D]
number of ions decreases
Answer: number of electrons decreases
47
In an oxidation process
[A]
oxidation number decreases
[B]
number of electrons decreases
[C]
oxygen content decreases
[D]
number of ions decreases
Answer: number of electrons decreases
48
Graphite is
[A]
an allotropic form of carbon
[B]
used as moderator in nuclear reactors
[C]
an electrical conductor
[D]
all of the above
49
Acids are substances that yield H+ in acqueous solutions while bases yield OH?ions. In a neutral solution
[A]
there are no H+
[B]
there are no OH?
[C]
H+ and OH- are present in very small but equal concentration
[D]
[H+] + [OH-] = 1
Answer: H+ and OH- are present in very small but equal concentration
50
The principal raw material for the production of chlorine gas by mercury electrolytic cell is
[A]
saturated NaCI solution only
[B]
saturated NaCI solution with solid NaCI make-up
[C]
solid NaCI only
[D]
90-92% NaCI solution
Answer: saturated NaCI solution with solid NaCI make-up
51
Mercury electrolytic cells are operated at a temperature of
[A]
60 - 70 ?C
[B]
130 - 140 ?C
[C]
200 - 215 ?C
[D]
100 - 110 ?C
52
When a saturated sodium chloride solution is electrolysed using graphic anode and steel cathode the products are
[A]
sodium metal and chlorine
[B]
hydrogen and oxygen
[C]
hydrogen chlorine and sodium hydroxide solution
[D]
hydrogen chlogrine and soda ash
Answer: hydrogen chlorine and sodium hydroxide solution
53
Mercury electrolytic cell produces
[A]
10-12% NaOH solution
[B]
50-70% NaOH solution
[C]
97-98.5% NaOH solution
[D]
20-25% NaOH solution
Answer: 50-70% NaOH solution
54
Diaphragm electrolytie cell produces
[A]
70% NaOH solution
[B]
60% NaOH solution
[C]
98.5% NaOH solution
[D]
10-12% NaOH solution
Answer: 10-12% NaOH solution
55
In a fuel cell
[A]
electrical energy is converted into chemical energy
[B]
chemical energy is converted into electrical energy
[C]
electrical energy is converted into mechanical energy
[D]
mechanical energy is converted into electrical energy
Answer: chemical energy is converted into electrical energy
56
In electrolysis oxidation takes place at
[A]
abnode
[B]
cathode
[C]
both the electrodes
[D]
none of the electrodes
57
A redox reaction is
[A]
proton transfer reaction
[B]
a reaction in gas phase
[C]
electron transfer reaction
[D]
ion combination reaction
Answer: electron transfer reaction
58
The quantity of an ion discharged druing electrolysis is not directly proportional to
[A]
time
[B]
current
[C]
resistance
[D]
chemical equivalent of the ion
Answer: chemical equivalent of the ion
59
Electrolytes when dissolved in water dissociate into their constituentions. The degree of dissociation of an electrolyte increases with
[A]
increasing concentration of the electrolyte
[B]
decreasing concentration of the electrolyte
[C]
decreasing temperature
[D]
none of the above
Answer: decreasing concentration of the electrolyte
60
Select the wrong statement
[A]
Voltaic cell uses exothermic chemical reactions to produce electrical energy
[B]
In the voltaic cell the positive current flows from the positive electrode to the negative electrode outside the cell
[C]
A voltaic cell can become an electrolysis cell by use of an external voltage greater than the voltaic cell voltage and imposed in the opposite directions
[D]
Voltaic cell uses electrical energy to produce endothermic chemical changes
Answer: Voltaic cell uses electrical energy to produce endothermic chemical changes