Non$-$metals are generally non$-$conductors of electricity. The non$-$metal whose one of the forms can be used to make electrodes in electrolysis experiments is:
- AIodine.
- ✓Carbon.
- CSilicon.
- DPhosphorus.
Answer: B.
View full solution →Question types
Chemical effects of electric current question types
82 questions across 7 question groups — pick any mix to generate a Science paper with step-by-step answer keys.
82
Questions
7
Question groups
5
Question types
01
MCQ
20 Q→02Fill In The Blanks.
6 Q→03Question Answer (1 Marks)
19 Q→04Question Answer (2 Marks)
17 Q→05Question Answer (3 Marks)
14 Q→06Question Answer (5 Marks)
4 Q→07true or false
2 Q→Sample Questions
Chemical effects of electric current questions
One sample from each question group in this chapter. Select any group above to see the full set with answer keys.
Which of the following metals are produced by the electrolysis of their molten compounds?
$(A).$ Copper.
$(B).$ Silver.
$(C).$ Aluminium.
$(D).$ Sodium.
$(A).$ Copper.
$(B).$ Silver.
$(C).$ Aluminium.
$(D).$ Sodium.
- A$A$ and $B$
- B$B$ and $C$
- ✓$C$ and $D$
- DOnly $D$
Answer: C.
View full solution →The process of purification of an impure metal is like:
- ✓Electroplating a metal on the same type of metal.
- BElectroplating a metal on another type of metal.
- CProducing a chemical compound by electrolysis.
- DDecomposing a chemical compound by electrolysis.
Answer: A.
View full solution →Which of the following types of energy can be used to decompose water into its elements?
- AHeat energy.
- BLight energy.
- CChemical energy.
- ✓Electrical energy.
Answer: D.
View full solution →The decomposition produced by passing current through a conducting liquid is called:
- ADialysis.
- BHydrolysis.
- ✓Electrolysis.
- DElectroplating.
Answer: C.
View full solution →Fill in the following blanks with suitable words:
When electric current is passed through acidified water, then ______________ and ______________ are formed.
When electric current is passed through acidified water, then ______________ and ______________ are formed.
Fill in the following blanks with suitable words:
LED glows even when a ______________ electric current passes through it.
LED glows even when a ______________ electric current passes through it.
Fill in the following blanks with suitable words:
The passage of an electric current through a conducting solution causes ______________ effect.
The passage of an electric current through a conducting solution causes ______________ effect.
Fill in the following blanks with suitable words:
The process of depositing a layer of any desired metal on another metal by means of electricity is called ______________.
The process of depositing a layer of any desired metal on another metal by means of electricity is called ______________.
Fill in the following blanks with suitable words:Most liquids that conduct electricity are solutions of ______________, _____________ and ______________.
Name two metals which are purified by using the chemical effect of current (or electrolysis).
Name two metals which are usually electroplated on cheaper metals for making jewelry (or ornaments).
Name one chemical compound which is produced by using the chemical effect of electric current.
What should be done to decompose water into hydrogen and oxygen?
Name one compound which is decomposed into hydrogen and oxygen by using the chemical effect of electric current.
Give one example of the chemical effect of electric current.
Which properties of chromium metal make it suitable for electroplating it on car bumpers, bath taps and bicycle handlebars, etc., made of iron?
Which of the two is a better conductor of electricity: drinking water (tap water) or sea water? Give reason for your answer.
Name the process in which a coating of one metal can be deposited on the surface of another metal by using current from a battery.
Name the most common application of the chemical effect of electric current.
What is meant by electroplating? What is the purpose of electroplating?
A beaker contains an acidified copper sulphate solution. A copper plate and a carbon rod are kept in this copper sulphate solution. The copper plate is connected to the positive terminal of a battery whereas the carbon rod is connected to the negative terminal of the battery. What will you observe when an electric current is passed through this set-up for a considerable time?
In case of a fire, before the firemen use the water hoses to throw water to douse fire, they shut off the electricity supply for the area. Explain why this is done.
When the free ends of a conductivity tester (made by using a battery connected to a wire wound around a compass) are dipped into a solution, the magnetic needle shows deflection. Can you give the reason for this deflection.
Why does a brand new bicycle have shining handlebar and wheel rims? What will happen if these are accidently scratched?
Name three liquids which when tested in the manner shown in figure given alongside may cause the magnetic needle of compass to deflect.
With the help of a labelled diagram, describe briefly how an iron key can be electroplated with copper.
Give a list of five objects around you which are electroplated.
A strip of impure copper metal is given to you. Describe briefly how you will purify it by using the chemical effect of electric current. Draw a labelled diagram of the experimental set up used for this purpose.
State whether the following statements are true or false:
Rainwater is a non-conductor of electricity.
Rainwater is a non-conductor of electricity.
State whether the following statements are true or false:
A piece of fresh potato does not conduct electricity at all.
A piece of fresh potato does not conduct electricity at all.
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