1
JEE Main 2023 (Online) 13th April Evening Shift
Numerical
+4
-1
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See the following chemical reaction:

$$\mathrm{Cr}_{2} \mathrm{O}_{7}^{2-}+\mathrm{XH}^{+}+6 \mathrm{~F}_{e}^{2+} \rightarrow \mathrm{YCr}^{3+}+6 \mathrm{~F}_{e}^{3+}+\mathrm{Z} \mathrm{H}_{2} \mathrm{O}$$

The sum of $$\mathrm{X}, \mathrm{Y}$$ and $$\mathrm{Z}$$ is ___________

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2
JEE Main 2023 (Online) 10th April Evening Shift
Numerical
+4
-1
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In alkaline medium, the reduction of permanganate anion involves a gain of __________ electrons.

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3
JEE Main 2023 (Online) 8th April Evening Shift
Numerical
+4
-1
Change Language

The sum of oxidation state of the metals in $$\mathrm{Fe}(\mathrm{CO})_{5}, \mathrm{VO}^{2+}$$ and $$\mathrm{WO}_{3}$$ is ___________.

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4
JEE Main 2023 (Online) 6th April Morning Shift
Numerical
+4
-1
Change Language

In ammonium - phosphomolybdate, the oxidation state of Mo is + ___________

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