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JEE Mains · Chemistry · STD 11 - 1. Some basic concept of chemistry

\(20.0 \,mL\) विलयन जिसमें \(0.2 \,g\) अशुद्ध \(H _{2} O _{2}\) उपस्थित है, अम्लीय विलयन में \(0.316 \,g KMnO _{4}\) के साथ पूर्ण रूप से क्रिया करता है तो \(H _{2} O _{2}\) की शु द्धता (% में) है \(\left( H _{2} O _{2}\right.\) का अणुभार \(=34 ; KMnO _{4}\) का अणुभार = \(158\))

  1. A \(90\)
  2. B \(95\)
  3. C \(85\)
  4. D \(80\)
Verified Solution

Answer & Solution

Correct Answer

(C) \(85\)

Step-by-step Solution

Detailed explanation

\(Eq\) of \(H _{2} O _{2}= Eq\) of \(KMnO _{4}\) \(x \times 2=\frac{0.316}{158} \times 5\) \(x=5 \times 10^{-3} mol\) \(m _{ H _{2} O _{2}}=5 \times 10^{-3} \times 34=0.17 gm\) \(\% H _{2} O _{2}=\frac{0.17}{0.2} \times 100=85\)
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