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Chemical Technology General Knowledge Quiz | Chemical Technology General Knowledge Short Questions & Answers

Questions
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
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43 Washing soda is
A Na2CO3.10H2O
B Na2CO3
C Na2CO3.H2O
D Na2CO3.2H2O

Answer: Na2CO3.10H2O
44 Soda ash is also called
A sodium carbonate
B sodium hydroxide
C sodium bicarbonate
D sodium oxide

Answer: sodium carbonate
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

Answer: 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

Answer: 60 - 70 ?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

Answer: abnode
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

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