Chemical Effects Of Electric Current Questions

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Chemical Effects Of Electric Current Questions

List of chemical effects of electric current Questions

Question NoQuestionsClass
1Find the total flux due to charge ( q )
associated with the given
hemispherical surface
A ( cdot(a) frac{q}{2 varepsilon_{0}},(b) 0,(c) frac{q}{varepsilon_{0}},(d) 0,(e) 0 )
В ( cdot(a) 0,(b) frac{q}{2 varepsilon_{0}},(c) 0,(d) frac{q}{varepsilon_{0}},(e) 0 )
c. ( (a) frac{q}{2 varepsilon_{0}},(b) frac{q}{varepsilon_{0}},(c) 0,(d) frac{q}{varepsilon_{0}},(e) 0 )
D. ( (a) 0,(b) frac{q}{2 varepsilon_{0}},(c) 0,(d) frac{q}{varepsilon_{0}},(e) frac{q}{varepsilon_{0}} )
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2Which of the following is true during electroplating?
A. The metal gets transferred from one electrode to another
B. The metal gets deposited from positive terminal of a battery to negative terminal of the battery.
c. An equal amount of metal gets dissolved in the solution of the electrolyte
D. All of the above
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3Galvanized iron sheets are coated with:
A. ( C )
в. ( C u )
( c cdot Z n )
D. ( N i )
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4Which of the following is added to make the copper sulphate solution more conducting?
A. Hydrochloric acid
B. Sulphuric acid
c. Nitric acid
D. Carbonic acid
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5Non electrolyte solution is of a chemical compound which :
A. Contain ions
B. conducts electricity
c. Does not conduct electricity
D. None of the above
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6Assertion: Metal ions must be present in a solution used for electroplating a particular metal.

Reason: Electroplating occurs only on
anode.
A. Both Assertion and Reason are true and Reason is the correct explanation of Assertion
B. Both Assertion and Reason are true but Reason is not the correct explanation of Assertion
c. Assertion is true but Reason is false
D. Assertion is false but Reason is true
E. Both Assertion and Reason are false

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7A cell constructed by coupling a standard copper electrode and a standard magnesium electrode has emf
of 2.7 volts. If the standard reduction
potential of the copper electrode is +0.34 volt, that of magnesium
electrode is:
A . +3.04 volts
B. -3.04 volts
c. +2.36 volts
D. -2.36 volts
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8Fill in the blanks
(a) Most liquids that conduct electricity are solutions of
and
(b) The passage of an electric current through a solution causes
effects.
(c) If you pass current through copper sulphate solution, copper gets
deposited on the plate connected to the terminal of the battery.
(d) The process of depositing a layer of any desired metal on another material
by means of electricity is called
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9The metal oxide rectifier used for
electrolytic process is placed along with the transformer:
A. Inside the oil
B. Outside the transformer but near to it
c. outside the transformer but far from it
D. Half immersed in the oi
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10True or False
Cathode rays can cast shadow of
opaque objects placed in their path.
8
11The standard hydrogen electrode
potential is zero, because
A. There is no potential difference between the electrode and the solution
B. Hydrogen ions acquire electrons from a platinum electrode
C. It has been measured accurately
D. It has been defined that way
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12When current is passed through calculated water, the Hydrogen and
Oxygen separates. The hydrogen gets accumulated on the negative electrode. Why does it not deposit on positive electrode?
A. Hydrogen is positive charge
B. Hydrogen is negatively charged
c. That is because, it is the characteristic of acidulated
water
D. None of the above
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13When the same amount of electricity is passed through solution of silver nitrate and copper sulfate, 0.4 g copper is deposited. The amount of silver deposited is:
A. ( 1.36 mathrm{g} )
в. 2.78
c. ( 5.1 mathrm{g} )
D. 5.48
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14In case of a fire, before the fireman use
the water hoses, they shut off the main
electrical supply for the area. Explain why they do this.
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15Assertion: Zinc is coated on the iron to
prevent corrosion in a process called galvanization. Reason: Zinc is a stronger reducing agent than iron and is more easily oxidized than iron.
A. Both Assertion and Reason are true and Reason is the correct explanation of Assertion
B. Both Assertion and Reason are true but Reason is not the correct explanation of Assertion
c. Assertion is true but Reason is false
D. Assertion is false but Reason is true
E. Both Assertion and Reason are false
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16One of the most common applications
of chemical effect of electric current is
A. electroplating
B. chemical etching
c. electric shielding
D. none of these
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17Explain why during electroplating, the article to be plated is always made the
cathode?
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18Plating a metal or an article with another metal is known as:
A. electroplating
B. electrorefining
c. extraction of metals
D. None of the above
8
19An electric current can produce
A. heating effect only.
B. chemical effect only.
C . magnetic effect only.
D. chemical, heating, and magnetic effects.
8
20In charging a battery of motor car, which of the following effect of electric current is used?
A. heating
B. magnetic
c. chemical
D. induction
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21A tester is used to check the conduction
of electricity through two liquids, labeled ( A ) and ( B ). It is found that the
bulb of the tester glows brightly for
liquid ( boldsymbol{A} ) while it glows very dimly for liquid ( B ). You would conclude that:
A. liquid ( A ) is a better conductor than liquid ( B )
B. liquid ( B ) is a better conductor than liquid ( A )
c. both liquids are equally conducting
D. conducting properties of liquid cannot be compared in this manner
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22The process of depositing a thin layer of desired metal on another metal by means of electricity is called:
A. electrolysis
B. dialysiss
c. electroplating
D. displacement
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23Tin cans used for storing food, are made by electroplating tin onto:
A . iron
B. gold
c. silver
D. copper
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24What will be happened an electric current is passed through a conducting solution?
A. heating solution
B. some chemical reactions
c. cooling
D. increase resistance
8
25Which plating is done on bicycle handle bars and wheel rims?
A. Iron plating
B. Gold plating
c. silver plating
D. Chromium plating
8
26Explain electroplating with suitable example.8
27The process of depositing a thin layer of desired metal over another metal by passing an electric current through some electrolyte is called:
A. electric shielding
B. electric polishing
c. electric coating
D. electroplating
8
28Compute the heat generating while transferring 96000 coulomb of charge in one hour through a potential difference of 50 V.8
29Why do jewellery makers electroplate gold or silver on metals?
A. To protect it from corrosion.
B. To prevent spoilage of jewellery
c. To make it shine.
D. To reduce cost.
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30Write short note on chrome plating?8
31Electroplating can done by
A. copper
B. Silver
c. Chromium
D. All of these
8
32Three iron pieces ( A, B, C ) are taken. ( B ) is coated with zinc and the coating is
worn away partially. ( C ) is coated with tin
and the coating is worn away partially. Explain the rate at which ( boldsymbol{A}, boldsymbol{B}, boldsymbol{C} )
undergo rusting on exposure to air. Give
reason.
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33Metal used in electroplating is:
This question has multiple correct options
A. Zinc
B. Iron
c. gold
D. None of these
8
34Which of the following uses chromium plating?
A. Car parts
B. Bath taps
C. Kitchen gas burners
D. All of the above
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35In electrolytic refining of any metal impure metal is taken as anode.
A. True
B. False
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36A coating of zinc is deposited on iron to protect it from
A . rain
B. corrosion
c. sun
D. none of these
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37Electroplating is a very useful process widely used in industry for coating metal objects with a thin layer of :
A. metals
B. non-metals
c. alloy
D. salts
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38Chromium plating is done on many articles so that they
A. Have shiny appearance
B. Do not corrode
c. Resist Scratches
D. All of these
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39Explain the term :Electroplating.8
40Assertion:Chromium plating is done on many objects like car parts, wheel rims and bath taps. Reason:The chromed layer can be decorative, provide corrosion resistance, ease cleaning procedures, or increase surface hardness.
A. Assertion is correct and Reason is incorrect
B. Assertion is incorrect and Reason is correct
c. Both Assertion and Reason is correct and Reason is the correct explanation of Assertion
D. Both Assertion and Reason is correct but Reason is not the correct explanation of Assertion
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41Tin cans, used for storing food are made by electroplating:
A. chrome onto tin
B. iron onto tin
c. tin onto iron
D. chrome onto iron
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42The process that you see is used for
purification of copper. A thin plate of
pure copper and a thick rod of impure
copper are used as electrodes. Copper
from impure rod is sought to be
transferred to the thin copper plate.
Which electrode should be attached to
the positive terminal of battery and
why?
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43When electric current is passed through a conducting solution, there is a change of colour of the solution. This indicates
A. the chemical effect of current
B. the heating effect of current.
c. the magnetic effect of current
D. the lightning effect of current
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44Which of the following feature makes chromium suitable for electroplating?
A. Shiny appearance
B. Does not corrode
c. Resistance to scratch
D. All of the above
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45Draw the diagram showing electroplating of a brass article silver and label the following:
a. Anode.
b. Electrolyte
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46Electroplating does not help
A. fine finish to the surface
B. shining appearance
C. metals to become hard
D. protect metals against corrosion
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47Why are objects electroplated?
A. To protect it from corrosion.
B. To prevent spoilage of objects.
C. To make it appear shining.
D. All of the above
8
48When ( 1 F ) of electricity is passed
through acidulated water, ( O_{2} ) evolved is:
A ( cdot 11.2 d m^{3} )
B. ( 5.6 d m^{3} )
c. ( 1.0 d m^{3} )
D. ( 22.4 d m^{3} )
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49A child staying in a coastal region tests
the drinking water and also the seawater with his tester. He finds that
the compass needle deflects more in the case of seawater. Can you explain the reason?
8
50Is it safe for the electrician to carry out
electrical repairs outdoors during heavy downpour? Explain.
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51Consider the following statements about electroplating:
I. Electroplating is the coating of metal objects with a thin layer of a different
metal.
II. Electroplating makes objects look more attractive and protects them from corrosion and rusting.
III. Electroplating forms and envelops around the object to protect them from magnetism. Which of the above statements is true?
A. Only statement I
c. Statements land II
D. Statements II and III
E. All of the above statements
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52Which of the following reasons can be attributed to prevention of rusting by zinc coating?
A. zinc acts as cathode
B. Zinc acts as anode
c. Iron acts as anode
D. Both (a) and (c)
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53Boojhos uncle has set up an electroplating factory near his village. He should dispose off the waste of the factory
A. in the nearby river
B. in the nearby pond
c. in the nearby cornfield
D. according to the disposal guidelines of the local authority
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54Why is a layer of zinc coated on iron?
A. To protect it from corrosion
B. To reduce on cost
c. To make it appear shining
D. All of the above
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55An electroplating factory should dispose-off their waste:
A. in the nearby river
B. in the nearby garbage
c. in the nearby field
D. according to guidelines of local authority
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56plating is done on
objects such as car parts, bath taps, kitchen gas burners, bicycle handlebars, wheel rims because of its
shiny appearance
A. Chromium
B. Nickel
c. carbon
D. None of these
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