Consider the following reactions The products [A] and [B], respectively are: [2025]

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Q.
Consider the following reactions

$K_{2} {Cr}_{2} O_{7} \to_{- H_{2} O}^{KOH} [A] \to_{- H_{2} O}^{H_{2} {SO}_{4}} [B] + K_{2} {SO}_{4}$

The products [A] and [B], respectively are: [2025]

1 $K_{2} {CrO}_{4} and K_{2} {Cr}_{2} O_{7}$

2 $K_{2} {CrO}_{4} and CrO$

3 $K_{2} {CrO}_{4} and {Cr}_{2} O_{3}$

4 $K_{2} Cr {(OH)}_{6} and {Cr}_{2} O_{3}$

Ans.
(1)

Chromate $({CrO}_{4}^{2 -})$ and dichromate $({Cr}_{2} O_{7}^{2 -})$ are inter-convertible into each other depending upon the pH of the solution. In acidic medium, ${Cr}_{2} O_{7}^{2 -}$ is more stable and in basic medium, ${CrO}_{4}^{2 -}$ is more stable.

$K_{2} {Cr}_{2} O_{7} \to_{- H_{2} O}^{KOH} \underset{[A]}{K_{2} {CrO}_{4}} \to_{- H_{2} O}^{H_{2} {SO}_{4}} \underset{[B]}{K_{2} {Cr}_{2} O_{7}} + K_{2} {SO}_{4}$

Solution

Q.
Consider the following reactions

$K_{2} {Cr}_{2} O_{7} \to_{- H_{2} O}^{KOH} [A] \to_{- H_{2} O}^{H_{2} {SO}_{4}} [B] + K_{2} {SO}_{4}$

The products [A] and [B], respectively are: [2025]

1 $K_{2} {CrO}_{4} and K_{2} {Cr}_{2} O_{7}$

2 $K_{2} {CrO}_{4} and CrO$

3 $K_{2} {CrO}_{4} and {Cr}_{2} O_{3}$

4 $K_{2} Cr {(OH)}_{6} and {Cr}_{2} O_{3}$

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Solution

Q. Consider the following reactions K2Cr2O7→-H2OKOH[A]→-H2OH2SO4[B]+K2SO4 The products [A] and [B], respectively are: [2025]

1 K2CrO4 and K2Cr2O7

2 K2CrO4 and CrO

3 K2CrO4 and Cr2O3

4 K2Cr(OH)6 and Cr2O3

Ans. (1) Chromate (CrO42-) and dichromate (Cr2O72-) are inter-convertible into each other depending upon the pH of the solution. In acidic medium, Cr2O72- is more stable and in basic medium, CrO42- is more stable. K2Cr2O7→-H2OKOHK2CrO4[A]→-H2OH2SO4K2Cr2O7[B]+K2SO4

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Q.
Consider the following reactions

$K_{2} {Cr}_{2} O_{7} \to_{- H_{2} O}^{KOH} [A] \to_{- H_{2} O}^{H_{2} {SO}_{4}} [B] + K_{2} {SO}_{4}$

The products [A] and [B], respectively are: [2025]

1 $K_{2} {CrO}_{4} and K_{2} {Cr}_{2} O_{7}$

2 $K_{2} {CrO}_{4} and CrO$

3 $K_{2} {CrO}_{4} and {Cr}_{2} O_{3}$

4 $K_{2} Cr {(OH)}_{6} and {Cr}_{2} O_{3}$