Tag: chemical effects of electric current

Questions Related to chemical effects of electric current

Which of the following is free of salts?

physics chemical effects of electric current does liquid conduct electricity? liquids conduct electricity do liquids conduct electricity?

  1. Distilled water

  2. Sea water

  3. Tap water

  4. All of the above

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Correct Option: A
Explanation:

Distilled water is free of salts.

Which of the following is used to detect the current?

physics chemical effects of electric current does liquid conduct electricity? liquids conduct electricity do liquids conduct electricity?

  1. Tester

  2. LED

  3. Compass needle

  4. All of the above

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Correct Option: D
Explanation:

Tester, LED and compass needle, all of them are used to detect electric current.

Electric circuit provides a complete path for :

physics chemical effects of electric current does liquid conduct electricity? liquids conduct electricity do liquids conduct electricity?

  1. solution to flow

  2. metal to flow

  3. neutron to flow

  4. current to flow

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Correct Option: D
Explanation:

Electric circuit provides a complete path for current to flow.

Small amounts of mineral salts present naturally in water are :

physics chemical effects of electric current does liquid conduct electricity? liquids conduct electricity do liquids conduct electricity?

  1. harmful for human health

  2. not at all useful for humans

  3. beneficial for human health

  4. none of the above

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Correct Option: C
Explanation:

Small amounts of mineral salts present naturally in water are beneficial for human health.

Water obtained from which of the following sources is a good conductor of electricity?

physics chemical effects of electric current does liquid conduct electricity? liquids conduct electricity do liquids conduct electricity?

  1. Tap

  2. Ponds

  3. Wells

  4. All of the above

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Correct Option: D
Explanation:

The water that we get from sources such as taps, hand pumps, wells and ponds is not pure. It may contain several salts dissolved in it. Small amounts of mineral salts are naturally present in it. This water is thus a good conductor of electricity.

Which of the following is a good conductor of electricity?

physics chemical effects of electric current does liquid conduct electricity? liquids conduct electricity do liquids conduct electricity?

  1. Sugar solution

  2. Oil

  3. Distilled water

  4. Tap water

Show answer
Correct Option: D
Explanation:

The water that we get from sources such as taps, hand pumps, wells and ponds is not pure. It may contain several salts dissolved in it. Small amounts of mineral salts are naturally present in it. This water is thus a good conductor of electricity.

If $Zn/Zn^{+2}$ electrode is diluted 100 times then the change in electromotive force will be :-

chemistry chemical effects of electric current applications of electrolysis electroplating extraction of metals by electrolysis

  1. increases of 59 mV

  2. decreases of 59 mV

  3. increases of 29.5 mV

  4. decreases of 29.5 mV

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Correct Option: A

The process of depositing thin layer of a metal over an another metal with a help of electric current is called :

chemistry chemical effects of electric current applications of electrolysis electroplating extraction of metals by electrolysis

  1. electrorefining

  2. electroplating

  3. thermoplating

  4. none of the above

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Correct Option: B
Explanation:

Electroplating is the process of plating one metal onto another, for decorative purposes or to prevent corrosion of a metal. 

The electrical process of coating an inexpensive conductor with a metal is called electroplating.

chemistry chemical effects of electric current applications of electrolysis electroplating extraction of metals by electrolysis

  1. True

  2. False

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Correct Option: A
Explanation:
Electroplating is a process that uses electric current to deposit/reduce dissolved metal cations so that they form a thin coherent metal coating on an electrode.

It is used to coat a relatively mundane metal, such as copper, with a thin layer of another, more precious metal, such as gold or silver. 

Hence, option $\text{A}$ is correct.

Chromium plating is done to make the object scratch proof and appear shiny.

chemistry chemical effects of electric current applications of electrolysis electroplating extraction of metals by electrolysis

  1. True

  2. False

Show answer
Correct Option: A
Explanation:

Chromium plating is a technique of electroplating in which a thin layer of chromium is coated onto a metal object. The layer is decorative (shiny), provide corrosion resistance, ease cleaning procedures, and increase surface hardness (scratch resistance).


Hence, option A is correct.