Redox Reaction · Chemistry · WB JEE
MCQ (Single Correct Answer)
1
What is the four-electron reduced form of $\mathrm{O}_2$ ?
WB JEE 2025
2
How many electrons are needed to reduce $\mathrm{N}_2$ to $\mathrm{NH}_3 ?$
WB JEE 2025
3
The equivalent weight of $$\mathrm{Na}_2 \mathrm{S}_2 \mathrm{O}_3(\mathrm{Gram}$$ molecular weight $$=\mathrm{M})$$ in the given reaction is
$$\mathrm{I}_2+2 \mathrm{Na}_2 \mathrm{~S}_2 \mathrm{O}_3=2 \mathrm{NaI}+\mathrm{Na}_2 \mathrm{~S}_4 \mathrm{O}_6$$
WB JEE 2024
4
The equivalent weight of KIO$$_3$$ in the given reaction is (M = molecular mass):
$$\mathrm{2Cr{(OH)_3} + 4O{H^ - } + KI{O_3} \to 2CrO_4^{2 - } + 5{H_2}O + KI}$$
WB JEE 2023
5
Oxidation states of Cr in K2Cr2O7 and CrO5 are respectively
WB JEE 2022
6
A given amount of Fe2+ is oxidised by x mol of $$MnO_4^ - $$ in acidic medium. The number of moles of $$C{r_2}O_7^{2 - }$$ required to oxidise the same amount of Fe2+ in acidic medium is
WB JEE 2021
7
0.126 g of an acid is needed to completely neutralise 20 mL 0.1 (N) NaOH solution. The equivalent weight of the acid is
WB JEE 2017
8
You are supplied with 500 mL each of 2N HCl and 5N HCl. What is the maximum volume of 3M HCl that you can prepare using only these two solutions?
WB JEE 2017
9
What will be the normality of the salt solution obtained by neutralising x mL y (N) HCl with y mL x(N) NaOH, and finally adding (x + y) mL distilled water
WB JEE 2017