JEE Main 2023 — Chemistry Physical Chemistry

2023integermedium

See the following chemical reaction:

${\mathrm{Cr}}_{2}{O}_{7}^{2-}+{\mathrm{XH}}^{+}+6{\mathrm{Fe}}^{2+}\rightarrow {\mathrm{YCr}}^{3+}+6{\mathrm{Fe}}^{3+}+{\mathrm{ZH}}_{2}O$

The sum of X, Y and Z is

Official previous-year question

Held on 13 Apr 2023 · Verified 6 Jul 2026.

Did you get this right?

Solution

The given equation can be balanced using ion-electron method as shown below.

${\mathrm{Fe}}^{2+}\rightarrow {\mathrm{Fe}}^{3+}+{e}^{-}$ -oxidation Half reaction

$6{e}^{-}+14{H}^{+}+{\mathrm{Cr}}_{2}{O}_{7}^{2-}\rightarrow 2{\mathrm{Cr}}^{3+}+7{H}_{2}O$ -Reduction Half reaction

The overall reaction is

$6{\mathrm{Fe}}^{2+}+14{H}^{+}+{\mathrm{Cr}}_{2}{O}_{7}^{2-}\rightarrow 6{\mathrm{Fe}}^{3+}+2{\mathrm{Cr}}^{3+}+7{H}_{2}O$

The values $X=14,Y=2\mathrm{and}Z=7$

$(X+Y+Z)=14+2+7$

$=23$

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JEE Main Physical Chemistry in other years

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JEE Main 2023 — Chemistry Physical Chemistry

2023integermedium

See the following chemical reaction:

${\mathrm{Cr}}_{2}{O}_{7}^{2-}+{\mathrm{XH}}^{+}+6{\mathrm{Fe}}^{2+}\rightarrow {\mathrm{YCr}}^{3+}+6{\mathrm{Fe}}^{3+}+{\mathrm{ZH}}_{2}O$

The sum of X, Y and Z is

Official previous-year question

Held on 13 Apr 2023 · Verified 6 Jul 2026.

Did you get this right?

Solution

The given equation can be balanced using ion-electron method as shown below.

${\mathrm{Fe}}^{2+}\rightarrow {\mathrm{Fe}}^{3+}+{e}^{-}$ -oxidation Half reaction

$6{e}^{-}+14{H}^{+}+{\mathrm{Cr}}_{2}{O}_{7}^{2-}\rightarrow 2{\mathrm{Cr}}^{3+}+7{H}_{2}O$ -Reduction Half reaction

The overall reaction is

$6{\mathrm{Fe}}^{2+}+14{H}^{+}+{\mathrm{Cr}}_{2}{O}_{7}^{2-}\rightarrow 6{\mathrm{Fe}}^{3+}+2{\mathrm{Cr}}^{3+}+7{H}_{2}O$

The values $X=14,Y=2\mathrm{and}Z=7$

$(X+Y+Z)=14+2+7$

$=23$

Your note

JEE Main Physical Chemistry in other years

Keep practicing Physical Chemistry

Work through every JEE Main Physical Chemistry PYQ, year by year.

Browse all Chemistry topics

JEE Main 2023 — Chemistry Physical Chemistry

Did you get this right?

Solution

Your note

JEE Main Physical Chemistry in other years

More JEE Main Physical Chemistry questions

Other Chemistry topics for JEE Main

Organic Chemistry

Inorganic Chemistry

Keep practicing Physical Chemistry

JEE Main 2023 — Chemistry Physical Chemistry

Did you get this right?

Solution

Your note

JEE Main Physical Chemistry in other years

More JEE Main Physical Chemistry questions

Other Chemistry topics for JEE Main

Organic Chemistry

Inorganic Chemistry

Keep practicing Physical Chemistry