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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 ?

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Short Answer Type

158. How will you represent an electrochemical cell with the help of cell notation or cell diagram?

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159.
What do you mean by redox couple ?

A redox couple may be defined as a combination of the oxidised and reduce forms of the same substance taking part in an oxidation or reduction half reactions. A redox couple is usually represented by separating the oxidised form and the reduced form of a vertical line which represents the interface (solid/solution). For example, in a galvanic cell, the two redox couples are represented as Zn²⁺/Zn and Cu²⁺/Cu. In both cases, oxidised form is put before the reduced form.

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