JEE Mains Previous Year Questions (PYQ)

JEE Main 2023 13th April Evening Shift

See the following chemical reaction:
\( \mathrm{Cr_2O_7^{2-}} + X\mathrm{H^+} + 6\mathrm{F_e^{2+}} \rightarrow Y\mathrm{Cr^{3+}} + 6\mathrm{F_e^{3+}} + Z\mathrm{H_2O} \)
The sum of \( X \), \( Y \) and \( Z \) is __________.

7.

\( \mathrm{H_2O_2} \) acts as a reducing agent in.

8.

‘\( 25 \) volume’ hydrogen peroxide means

9.

See the following chemical reaction:
\( \mathrm{Cr_2O_7^{2-}} + X\mathrm{H^+} + 6\mathrm{F_e^{2+}} \rightarrow Y\mathrm{Cr^{3+}} + 6\mathrm{F_e^{3+}} + Z\mathrm{H_2O} \)
The sum of \( X \), \( Y \) and \( Z \) is __________.

10.

In Chromyl chloride, the oxidation state of chromium is (+) __________.

11.

The number of electrons involved in the reduction permanganate to manganese dioxide in acidic medium is _______.

12.

The standard electrode potential \( (\mathrm{M^{3+}} / \mathrm{M^{2+}}) \) for \( \mathrm{V} \), \( \mathrm{Cr} \), \( \mathrm{Mn} \) and \( \mathrm{Co} \) are \( -0.26 \ \mathrm{V} \), \( -0.41 \ \mathrm{V} \), \( +1.57 \ \mathrm{V} \) and \( +1.97 \ \mathrm{V} \), respectively. The metal ions which can liberate \( \mathrm{H_2} \) from a dilute acid are;

13.

\( \mathrm{KMnO_4} \) is titrated with ferrous ammonium sulphate hexahydrate in presence of dilute \( \mathrm{H_2SO_4} \). Number of water molecules produced for \( 2 \) molecules of \( \mathrm{KMnO_4} \) is _______.

14.

During the reaction of permanganate with thiosulphate, the change in oxidation of manganese occurs by value of \( 3 \). Identify which of the below medium will favour the reaction.

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