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151. In Ostwald’s process for the manufacture of nitric acid, the first step involves the oxidation of ammonia gas by oxygen gas to give nitric oxide gas and steam. What is the maximum weight of nitric oxide that can be obtained starting only with 10.0 g of ammonia and 20.0 g of oxygen?

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152. Define electrochemical cell. What are the main requirements of an electro- chemical cell?

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Long Answer Type

153.

Discuss in brief the working of an electrochemical cell.

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154. Explain the function of salt bridge in an electrochemical cell.

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Short Answer Type

155.

What are half cell reactions? Explain.

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156.

Write down the half reaction and net reaction for the Daniell cell.
$right enclose Zn left parenthesis straight s right parenthesis end enclose space Zn to the power of 2 plus end exponent left parenthesis aq right parenthesis vertical line vertical line space space Cu to the power of 2 plus end exponent left parenthesis aq right parenthesis space left parenthesis 1 space straight M right parenthesis space Cu left parenthesis straight s right parenthesis.$

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Long Answer Type

157.
Give the points of difference between a redox reaction occurring in a beaker and in a cell ?

Redox reaction in a beaker(Direct redox reaction)	Redox reaction in an electrochemical cell (Indirect redox reaction)
1. Oxidation and reduction take place in the same vessel.	1. Oxidation and reduction take place in different vessels called half cells.
2. The transference of electrons occurs directly in the solution.	2. The transference of electrons takes place through connecting wires.
3. Energy is released in the form of heat.	3. Most of the energy is released in the form of electrical energy.
4. The cations accept the electrons at the surface of the cathode and metal formed gets deposited at the cathode.	4. The cations accept the electrons in solution and metal formed settles down as a precipitate.
5. Reaction quickly proceeds to completion.	5. The reaction does not proceed to completion.