Electrochemistry Test

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Electrochemistry Test - 32

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Weekly Quiz Competition

Question 1
1 / -0

A metal is released in the electrolysis of a salt. It gets deposited on the :

A
sides of the container

B
half of positive terminal and half of negative terminal

C
negative terminal

D
positive terminal

Solution

The metal which is released in the electrolysis is of simple salt, so it would generally be deposited on the cathode.

For example, suppose we take sodium chloride (NaCl) then on breaking this into simpler form we get,

$$NaCl\rightarrow Na^++Cl^-$$

This can be said that as Na acquires positive charge, it shall move to negative electrode (or negative terminal) i.e. cathode.

Hence , option C is correct .
Question 2
1 / -0

For reducing one mole of $$Cr_{2} O_{7}^{2-}$$ to $$Cr^{3+}$$, the charge required is:

A
$$3\times 96500\ coulomb$$

B
$$6\times 96500\ coulomb$$

C
$$0.3\ Faradays$$

D
$$0.6\ Faradays$$

Solution

$$Cr_{2}O_{7}^{2-} + 14H^{+} + 6e^{-} \rightarrow 2Cr^{3+} + 7 H_{2} O$$
For reducing one mole of $$Cr_{2}O_{7}^{2-}$$, charge required $$= 6\times 96500\ coulomb$$.
Question 3
1 / -0

The internal resistance of a lead acid battery can be reduced by

A
Using strips of wood or celluloid as separators between electrodes

B
Using grids of hard lead-antinomy alloy

C
Using a specific manner of assembly of electrodes with wood or celluloid separators in between

D
Both option A and B
Question 4
1 / -0

The charge required for the reduction of $$1\ mol$$ of $${MnO_{4}}^{-}$$ to $$MnO_{2}$$ is:

A
$$1\ F$$

B
$$3\ F$$

C
$$5\ F$$

D
$$6\ F$$

Solution

$$MnO_{4}^{-} + 4H^{+} + 3e^- \rightarrow MnO_{2} + 2H_{2} O$$

Oxidation number of Mn in $${MnO_4}^-$$ = +7
Oxidation number of Mn in $$MnO_2$$ = +4

So, $$3\ F$$ of charge will be required to reduce $$1\ mole$$ of $$MnO_{4}^{-}$$.

Hence, option B is correct.
Question 5
1 / -0

The process of lead action in a simple voltaic cell

A
Catalyses the process of electrolysis

B
Increases the efficiency of the cell

C
Decreases the efficiency of the cell

D
Increases the charge carriers

Solution

The process of lead action in a simple voltaic cell is a chemical action that occurs while the current is flowing and causes hydrogen bubbles to form on the surface of anode. The action is called polarization.
Some hydrogen bubbles rise to the surface of the electrolyte and escape into the air and some remain on the surface of the anode. If enough bubbles remain around the anode, the bubbles form a barrier that increases internal resistance.
When the internal resistance of the cell increases, the output current is decreased and the voltage of the cell also decreases.
Hence it decreases the efficiency of the cell.
Question 6
1 / -0

The $$ZnCl$$ used in a dry cell is which helps to maintain the moistness of paste contained in the cell between anode and cathode is

A
Highly hydroscopic

B
Weak hydroscopic

C
Strongly hydrophobic

D
Weak hydrophobic

Solution

The Zinc used in dry cell is which helps to maintain the moistness of paste contained in the cell between anode and cathode is highly hygroscopic
Question 7
1 / -0

The standard reduction potential for $$Mg^{2+}/Mg$$ is $$-2.37V$$ and for $$Cu^{2+}/Cu$$ is $$0.337$$. The $$E^o_{cell}$$ for the following reaction is $$Mg+Cu^{2+}\rightarrow Mg^{2+}+Cu$$

A
$$+2.03V$$

B
$$-2.03V$$

C
$$-2.7V$$

D
$$+2.7V$$

Solution

$$E^o_{cell}=E^o_{cathode}-E^o_{anode}$$
$$=E^o_{(Cu^{2+}/Cu)}-E^o_{(Mg^{2+}/Mg)}=0.337-(-2.37)V$$
$$=2.7V$$
Question 8
1 / -0

Electrolytes which allow large current to pass through them are known as :

A
weak electrolytes

B
strong electrolytes

C
non-electrolytes

D
none of the above

Solution

Electrolytes which allow large current to pass through them are known as strong electrolytes.
Question 9
1 / -0

_____________ ionizes in a fused or in aqueous solution state and furnish positive ions other than $$H^+$$ and negative ions other than $$OH^-$$.

A
Mineral acids

B
Bases

C
Ionic salts

D
Compounds

Solution

Ionic salts ionizes in a fused or in aqueous solution state and furnish positive ions other than $$H^+$$ and negative ions other than $$OH^−$$.
For example, aq NaCl ionises to form $$\displaystyle Na^+$$ ions and chloride $$\displaystyle Cl^-$$ ions.
$$\displaystyle NaCl \rightleftharpoons Na^+ + Cl^- $$
Question 10
1 / -0

______ ionizes in fused or in aqueous solution state and furnish ions in solution.

A
Mineral acids

B
Bases

C
Ionic salts

D
Compounds

Solution

Bases ionizes in fused or in aqueous solution state and furnish ions in solution.

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Electrochemistry Test - 32

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Electrochemistry Test - 32

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Question 1

sides of the container

half of positive terminal and half of negative terminal

negative terminal

positive terminal

Solution

Question 2

$$3\times 96500\ coulomb$$

$$6\times 96500\ coulomb$$

$$0.3\ Faradays$$

$$0.6\ Faradays$$

Solution

Question 3

Using strips of wood or celluloid as separators between electrodes

Using grids of hard lead-antinomy alloy

Using a specific manner of assembly of electrodes with wood or celluloid separators in between

Both option A and B

Question 4

$$1\ F$$

$$3\ F$$

$$5\ F$$

$$6\ F$$

Solution

Question 5

Catalyses the process of electrolysis

Increases the efficiency of the cell

Decreases the efficiency of the cell

Increases the charge carriers

Solution

Question 6

Highly hydroscopic

Weak hydroscopic

Strongly hydrophobic

Weak hydrophobic

Solution

Question 7

$$+2.03V$$

$$-2.03V$$

$$-2.7V$$

$$+2.7V$$

Solution

Question 8

weak electrolytes

strong electrolytes

non-electrolytes

none of the above

Solution

Question 9

Mineral acids

Bases

Ionic salts

Compounds

Solution

Question 10

Mineral acids

Bases

Ionic salts

Compounds

Solution

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