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JEE Main 2017 · 9 Apr · Shift 1, Chemistry question 35

What quantity (in mL) of a 45% acid solution of a mono-protic strong acid must be mixed with a 20% solution of the same acid to produce 800 mL of a 29.875% acid solution ?

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Answer and worked solution

Official answer: C

0.45x+0.20(800−x)=0.29875×800=2390.45x+0.20(800-x)=0.29875\times800=239, so 0.25x=790.25x=79 and x=316x=316 mL.

Topics:Concentration terms
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