In the chromyl chloride test,the oxidation st | vedclass

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(D) The chromyl chloride test is used for the detection of chloride ions $(Cl^-)$. In this test,a chloride salt is heated with potassium dichromate $(

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Remains constant

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(D) The chromyl chloride test is used for the detection of chloride ions $(Cl^-)$. In this test,a chloride salt is heated with potassium dichromate $(K_2Cr_2O_7)$ and concentrated sulfuric acid $(H_2SO_4)$. The reaction produces chromyl chloride $(CrO_2Cl_2)$ vapors. The chemical equation is: $K_2Cr_2O_7 + 4NaCl + 6H_2SO_4 \rightarrow 2KHSO_4 + 4NaHSO_4 + 2CrO_2Cl_2 + 3H_2O$. In $K_2Cr_2O_7$,the oxidation state of $Cr$ is $+6$. In the product $CrO_2Cl_2$,the oxidation state of $Cr$ is calculated as: $x + 2(-2) + 2(-1) = 0$,which gives $x - 4 - 2 = 0$,so $x = +6$. Since the oxidation state of $Cr$ is $+6$ in both the reactant $(K_2Cr_2O_7)$ and the product $(CrO_2Cl_2)$,it remains constant.

In the chromyl chloride test,the oxidation state of $Cr$ changes from:

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