What are half cell reactions? Explain.  from Chemistry Redox R

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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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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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155.

What are half cell reactions? Explain. 


An electrons cell is made up of two half cells in each of which a half-reaction takes place. The half reaction taking place in each half cell is known as half cell reaction. A half cell reaction in which electrons are released or oxidation occurs is called oxidation half cell reaction and the one in which electrons are accepted or reduction occurs is called reduction half-cell reaction, e.g. in Daniell cell, two half reactions taking place are:

(i) Oxidation half cell reaction (Anode reaction):

       
(ii) Reduction half cell reaction (Cathode reaction):

          

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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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157.

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

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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 ?

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160. Consider the following reactions which produce electricity in a galvanic cell:
left parenthesis straight i right parenthesis space 2 Fe to the power of 2 plus end exponent space plus space Cl subscript 2 left parenthesis straight g right parenthesis space space rightwards arrow space space space 2 Fe to the power of 3 plus end exponent space plus space 2 Cl to the power of minus
left parenthesis ii right parenthesis space Cd left parenthesis straight s right parenthesis space plus space straight I subscript 2 space space space rightwards arrow space space space space Cd to the power of 2 plus end exponent space plus space 2 straight I to the power of minus
left parenthesis iii right parenthesis space 2 Cr left parenthesis straight s right parenthesis space plus space 3 Cu to the power of 2 plus end exponent space rightwards arrow space space 3 Cu left parenthesis straight s right parenthesis space plus space 2 Cr to the power of 3 plus end exponent
Write the anode and cathode reactions for galvanic cell. Specify the nature of anodes and cathodes. Write the cell in the usual notation.
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