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Which of the following statement(s) is (...

Which of the following statement(s) is (are) correct. When a mixture of `NaCl` and `K_2Cr_2O_2` is gently warmed with conc. `H_2SO_4`

A

A deep red vapours is evolved

B

The vapours when passed into NaOH solution gives a yellow solution of `Na_2CrO_4`

C

Chlorine gas is evolved

D

Chromyl chloride is formed

Text Solution

Verified by Experts

The correct Answer is:
A, B, C, D
`K_2Cr_2O_7 +Cl^(-) rarr underset("(Red)")(CrO_2Cl_2) uarr`
`CrO_2Cl_2 + NaOH rarr underset("(Yellow Solution)")(Na_2CrO_4) overset(Pb^(+2))rarr underset("(Yellow ppt)")(PbCrO_4uarr)`
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K_2Cr_2O_7 acts as a good oxidizing agent in acidic medium underset("Orange")(Cr_(2)O_(7)^(2-)) + 14H^(+) + 6e^(-) rarr underset("Green")(2Cr^(3+)) + 7H_2O In alkaline solution, orange colour of Cr_(2)O_(7)^(2-) chages to yellow colour due to formation of Cr_2O_(4)^(2-) and again yellow colour changes to orange colour on changing the solution to acidic medium underset("Orange")(Cr_2O_7^(2-))+2OH^(_) rarrunderset("Yellow")(Cr_2O_7^(2-))+H_2O underset("Yellow")(2CrO_(4)^(2_-)) + 2H^(+) rarr underset("Orange")(Cr_(2)O_(7)^(2-) + H_(2)O) Cr_(4)^(2-) and Cr_(2)O_(7)^(2-) exist in equilibrium at pH =4 and are interconvertible by altering the pH of the solution. When heated with H_2SO_4 and metal chloride K_2Cr_2O_7 gives vapour of chromyl chloride (CrO_2Cl_2) . Chromyl chloride (CrO_2Cl_2) when passed into aqueous NaOH solution, yellow colour solution of CrO_(4)^(2-) is obtained. This on reaction with lead acetate gives yellow ppt. PbCrO_4 . When H_2O_2 is added to an acidified solution of dichromate ion, a complicated reaction occurs. The products obtained depend on the pH and concentration of dichromate. Cr_2O_7^(2-)+2H^(+) + 4H_(2)O_(2) rarr 2Cr(O_2)+5H_2O A deep blue-violet coloured peroxo compound, CrO(O_2)_2, ' called chromic peroxide is formed. This decomposes rapidly in aqueous solution into Cr^(3+) and xygen. Which of the following statements is wrong when a mixture of NaCI and K_2Cr_2O_2 is gently walmed with conc. H_2SO_4 ?

Which substance chars when warmed with conc. H_2SO_4 ?

Which of the following reaction takes place when a mixture of concentrated HNO_3 and H_2SO_4 reacts on benzene at 300 K.

Anisole with HNO_3 and conc H_2SO_4 gives

Which of the following statements is/are true A) Na_(2) r_(2), O_(7) is more soluble in water than K_(2)CR_(2)O_(7) B) K_(2)Cr_(2)O_(7) is used as a primary standard in volumetric analysis C) Both Na_(2)Cr_(2)O_(7) and K_(2) Cr_(2)O_(7) are strong oxidizing agents D) The chromates and dichromates are interconvertible in aqueous solutions

Calculate the oxidation number of 'Cr' in K_2Cr_2O_2 .

The compound which gives carbon with conc. H_(2)SO_(4)

Which of the following alcohols will not be easily oxidised by K_2Cr_2O_7 in dil. H_2SO_4 ?

Mark the compound which gives carbon with conc. H_(2)SO_(4) :

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