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Oxidation state of Cr in chromyl chloride or CrO5

This type of question, asked 6 times: 8 Apr 2023, 15 Apr 2023, 29 Jan 2024, 31 Jan 2024, 21 Jan 2026 S1, 21 Jan 2026 S2. All 6 questions below, oldest first.

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  1. Question 1

    8 Apr 2023

    43
    In chromyl chloride, the number of d-electrons present on chromium is same as in (Given at no. of Ti : 22, V : 23, Cr:24, Mn : 25, Fe : 26)

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  2. Question 2

    15 Apr 2023

    54
    In Chromyl chloride, the oxidation state of chromium is (+)____

  3. Question 3

    29 Jan 2024

    33
    In chromyl chloride test for confirmation of Cl−Cl^{-} ion, a yellow solution is obtained. Acidification of the solution and addition of amyl alcohol and 10%10\% H2O2H_{2}O_{2} turns organic layer blue indicating formation of chromium pentoxide. The oxidation state of chromium in that is

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  4. Question 4

    31 Jan 2024

    146
    In the reaction of potassium dichromate, potassium chloride and sulfuric acid (conc.), the oxidation state of the chromium in the product is (+)( + )____.

  5. Question 5

    21 Jan 2026 S1

    50
    Consider the following reactions:
    NaCl+K2Cr2O7+H2SO4→ A+KHSO4+NaHSO4+H2OA+NaOH→B+NaCl+H2OB+H2SO4+H2O2→C+Na2SO4+H2O\begin{gathered}NaCl + K_{2}{Cr}_{2}O_{7} + H_{2}{SO}_{4} \rightarrow \text{ }A + {KHSO}_{4} + {NaHSO}_{4} + H_{2}O \\ A + NaOH \rightarrow B + NaCl + H_{2}O \\ B + H_{2}{SO}_{4} + H_{2}O_{2} \rightarrow C + {Na}_{2}{SO}_{4} + H_{2}O\end{gathered}
    In the product ' C ', ' X ' is the number of O22−O_{2}^{2 -} units, ' Y ' is the total number oxygen atoms present and ' ZZ ' is the oxidation state of Cr . The value of X+Y+ZX + Y + Z is ____.

  6. Question 6

    21 Jan 2026 S2

    45
    On heating a mixture of common salt and K2Cr2O7K_{2}Cr_{2}O_{7} in equal amount along with concentrated H2SO4H_{2}SO_{4} in a test tube, a gas is evolved. Formula of the gas evolved and oxidation state of the central metal atom in the gas respectively are :

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