SATHEE: Redox Reactions And Electrochemistry Ques 93

Redox Reactions And Electrochemistry Ques 93

Question: Aluminium oxide may be electrolysed at 1000°C to furnish aluminium metal (At. Mass = 27 amu; 1 Faraday = 96,500 Coulombs). The cathode reaction is $A l^{3} + 3 e^{-} \to A l^{\circ}$ To prepare 5.12kg of aluminium metal by this method would require [AIEEE 2005]

Options:

A) $5.49 \times 10^{7} C$ of electricity

B) $1.83 \times 10^{7} C$ of electricity

C) $5.49 \times 10^{4} C$ of electricity

D) $5.49 \times 10^{1} C$ of electricity

Show Answer

Answer:

Correct Answer: A

Solution:

27 gm of Al is obtained by passing a current of 3 × 96500 C.

$∵$ 1 gm of Al is obtained by passing a current of $3 \times \frac{96500}{27} C .$ \ 5.12 × 103 gm of Al is obtained by passing a current of $3 \times \frac{96500}{27} \times 5.12 \times 1000$ = 1.83 × 107 C × 3 = 5.49 × 107C.

Redox Reactions And Electrochemistry Ques 93

Question: Aluminium oxide may be electrolysed at 1000°C to furnish aluminium metal (At. Mass = 27 amu; 1 Faraday = 96,500 Coulombs). The cathode reaction is $A l^{3} + 3 e^{-} \to A l^{\circ}$ To prepare 5.12kg of aluminium metal by this method would require [AIEEE 2005]

Options:

Answer:

Solution:

Engineering Preparation

Medical Preparation

NCERT Books & Solutions

Important Resources

Other Resources

Syllabus

Test Platform

Sample Mock Test

Mentorship

NCERT Exercise Video Solution

Redox Reactions And Electrochemistry Ques 93

Question: Aluminium oxide may be electrolysed at 1000°C to furnish aluminium metal (At. Mass = 27 amu; 1 Faraday = 96,500 Coulombs). The cathode reaction is Al3+3e−→Al∘ To prepare 5.12kg of aluminium metal by this method would require [AIEEE 2005]

Options:

Answer:

Solution:

Engineering Preparation

Medical Preparation

NCERT Books & Solutions

Important Resources

Other Resources

Syllabus

Test Platform

Sample Mock Test

Mentorship

NCERT Exercise Video Solution

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Question: Aluminium oxide may be electrolysed at 1000°C to furnish aluminium metal (At. Mass = 27 amu; 1 Faraday = 96,500 Coulombs). The cathode reaction is $A l^{3} + 3 e^{-} \to A l^{\circ}$ To prepare 5.12kg of aluminium metal by this method would require [AIEEE 2005]