1
WB JEE 2026
MCQ (Single Correct Answer)
+1
-0.25
A compound $(\mathrm{X})$ when treated with $\mathrm{CuSO}_4$ solution yields a brown precipitate．On adding hypo solution the precipitate turns white．The compound $(\mathrm{X})$ is
2
WB JEE 2026
MCQ (Single Correct Answer)
+2
-0.5
A $5.0 \mathrm{~cm}^3$ solution of $\mathrm{H}_2 \mathrm{O}_2$ liberates 1.27 g of iodine from an acidified KI solution. The percentage strength of $\mathrm{H}_2 \mathrm{O}_2$ is close to
3
WB JEE 2025
MCQ (Single Correct Answer)
+1
-0.25
What is the four-electron reduced form of $\mathrm{O}_2$ ?
4
WB JEE 2025
MCQ (Single Correct Answer)
+1
-0.25
How many electrons are needed to reduce $\mathrm{N}_2$ to $\mathrm{NH}_3 ?$
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