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Science Preparation for Engineering Entrance
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Directions: The following question is based on the paragraph given below.


Chemical reactions involve interaction of atoms and molecules. A large number of atoms / molecules (approximately 6.023 ×1023) are present in a few grams of any chemical compound varying with their atomic /molecular masses. To handle such large numbers conveniently, the mole concept was introduced.
This concept has implications in diverse areas such as analytical chemistry, biochemistry, electrochemistry and radiochemistry. The following example illustrates a typical case, involving chemical/electrochemical reaction, which requires a clear understanding of the mole concept. A 4.0 molar aqueous solution NaCl is prepared and 500 mL of this solution is electrolysed. This leads to the evolution of chlorine gas at one of the electrodes (atomic mass : Na = 23, Hg = 200;1 Faraday = 96500 coulombs).


The total number of moles of chlorine gas evolved is

 
0.5
1.0
2.0
3.0

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Gaurav Singh

Question is having wrong value of NaCl concentration. In question it is given [NaCl]=4.0M while in solution it is given, [NaCl]=0.4M