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Working of Salt Bridge

What is the p...

Question

What is the purpose of the salt bridge?

Maintains the electric neutrality in internal circuit.

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It transfers the electrons from negative rod to positive rod.

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Cools down the cell by injecting ions into electrolytes.

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It transfers the protons from negative rod to positive rod.

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It transfers the protons from negative rod to positive rod.

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Solution

The correct option is A Maintains the electric neutrality in internal circuit.
The purpose of a salt bridge is not to move electrons from the electrolyte, rather maintain charge balance because the electrons are moving from one-half cell to the other.

The electrons flow from the negative electrode to positive electrode. The oxidation reaction that occurs at the anode generates electrons and positively charged ions. The electrons move through the wire leaving the unbalanced positive charge in the vessel. In order to maintain neutrality, the negatively charged ions in the salt bridge will migrate into the anodic half cell. A similar (but reversed) situation is found in the other cell, where Cu2+ ions are being consumed, and therefore electroneutrality is maintained by the migration of K+ ions from the salt bridge into this half cell.

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Similar questions

Q. A neutral rubber rod and a neutral piece of fur have equal amounts of negative and positive charge. When the fur is rubbed against the rod, a transfer of electrons occurs. The transfer of electrons and mass transfer respectively takes place from

Select the correct alternative:

(a) when a glass rod is rubbed with the dry silk cloth, the charge acquired by the silk cloth is :

(i) positive

(ii) negative

(iii) both positive and negative

(iv) none of the above.

(b) When an ebonite rod is rubbed with fur,the rod acquires:

(i) positive charge

(ii) negative charge

(iii) no charge

(iv) none of the above.

(i) attraction

(ii) no effect

(iii) repulsion

(iv) none of the above.

(d) Charging a conductor by bringing another charged conductor close to it without touching is called :

(i) induction (ii) conduction

(iii) convection (iv) radiation.

(e) The factor responsible for charging a conductor is :

(i) transfer of protons

(ii) transfer of neutrons

(iii) transfer of electrons

(iv) transfer of protons and electrons.

(f) Two objects when rubbed together get charged.The charges on them are:

(i) equal and opposite

(ii) equal and similar

(iii) unequal and similar

(iv) unequal and opposite

(g) When a glass rod is rubbed with silk,the glass rod and the silk get charged because:

(i) electrons are transferred from the silk to the glass rod

(ii) electrons are transferred from the glass rod to the silk.

(iii) protons are transferred from the silk to the glass rod.

(iv) protons are transferred from the glass rod to the silk.

(h) The conductor of electricity is :

(i) wood (ii) glass

(iii) ebonite (iv) human body

(i) A gold leaf electroscope is to be charged positively by conduction.For this:

(i) a positively charged rod is held close to near the disc of electroscope.

(ii) a positively charged rod is placed in contact with the disc of electroscope.

(iii) a negatively charged rod is held close to near the disc of electroscope.

(iv) a negatively charged rod is touched with the disc of electroscope.

(j) A glass rod rubbed with silk is touched with the disc of negatively charged gold leaf electroscope.The divergence of leaves will:

(i) decrease

(ii) increase

(iii) remain unchanged

(iv) first decreases and then increases.

(k) The rod in gold leaf electroscope is made up of:

(i) wood (ii) brass

(iii) glass (iv) ebonite

(l) Lighting conductor is made up of :

(i) copper (ii) glass

(iii) ebonite (iv) wood

How can we say that charge acquired by glass rod is positive while for ebonite rod it is negative?

Q. A neutral metal sphere is touched by a negatively charged metal rod. During the process, electrons are transferred from the ______ to the ______ and the sphere acquires a ______ charge.

Question 2

When a glass rod is rubbed with a piece of silk cloth the rod :
a) both glass rod and the cloth both acquire positive charge.
b) glass rod becomes positively charged while the cloth has a negative charge.
c) both glass rod and the cloth both acquire negative charge.
d)glass rod becomes negatively charged while the cloth has a positive charge.

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