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Question

342 gm of 20% by mass of Ba(OH)2 solution (sp.gr.0.57) is reacted with 1200 mL of 2 M HNO3.If the final density is same as pure water than molarity of the ion in resulting solution by nature of the above solution is identified, is :

A
0.25
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B
0.5 M
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C
0.888 M
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D
none of these
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Solution

The correct option is D 0.888 M
No. of moles of Ba(OH)2=20×342100×171
=0.4 mole
or moles of OH=0.4×2
No. of moles of HNO3=1.2×2=2.4 mole
Hence, the final solution is acidic due to presence of excess H+
[H+]=(2.40.8)×10001200+3420.57=0.888M

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