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Question

Equal volumes of 0.1 M AgNO3 and 0.2 M NaCl are mixed. The concentration of NO−3 ions in the mixture will be:

A
0.1 M
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B
0.05 M
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C
0.20 M
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D
0.15 M
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Solution

The correct option is B 0.05 M
Let the volume of both, AgNO3 and NaCl be V L.
Molarity=number of molesvolume of the solution in L
Number of moles of AgNO3=0.1 V
Moles of Ag+=moles of NO3=0.1 V
So, molarity of NO3=total moles of NO3total volume of the solution in L=0.1V2V=0.05 M

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