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1
JEE Main 2022 (Online) 26th July Evening Shift
MCQ (Single Correct Answer)
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-1
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The products obtained from a reaction of hydrogen peroxide and acidified potassium permanganate are :
A
$$\mathrm{Mn}^{4+}, \mathrm{H}_{2} \mathrm{O}$$ only
B
$$\mathrm{Mn}^{2+}, \mathrm{H}_{2} \mathrm{O}$$ only
C
$$\mathrm{Mn}^{4+}, \mathrm{H}_{2} \mathrm{O}, \mathrm{O}_{2}$$ only
D
$$\mathrm{Mn}^{2+}, \mathrm{H}_{2} \mathrm{O}, \mathrm{O}_{2}$$ only
2
JEE Main 2022 (Online) 26th July Morning Shift
MCQ (Single Correct Answer)
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-1
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Which of the following can be used to prevent the decomposition of $$\mathrm{H}_{2} \mathrm{O}_{2}$$ ?

A
Urea
B
Formaldehyde
C
Formic acid
D
Ethanol
3
JEE Main 2022 (Online) 25th July Evening Shift
MCQ (Single Correct Answer)
+4
-1
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High purity (> 99.95%) dihydrogen is obtained by :

A
reaction of zinc with aqueous alkali.
B
electrolysis of acidified water using platinum electrodes.
C
electrolysis of warm aqueous barium hydroxide solution between nickel electrodes.
D
reaction of zinc with dilute acid.
4
JEE Main 2022 (Online) 25th July Morning Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
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The reaction of $$\mathrm{H}_{2} \mathrm{O}_{2}$$ with potassium permanganate in acidic medium leads to the formation of mainly :

A
Mn2+
B
Mn4+
C
Mn3+
D
Mn6+
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