In dichromate ion, the measure of `Cr - O - Cr` angle is -

Which of the following statement (s) is /are correct? (I) In acidic solution dichromate ions are converted to chromate ions . (II) An acidified solution of K_(2)Cr_(2)O_(7) liberates iodine from iodides. (III) Potassium dichromate is used as a titrant for Fe^(2+) ions. (IV) Ammonium dichromate on heating undergo exothermic decomposition to give Cr_(2)O_(3) . Choose the correct option .

In the following figure the Cr-O-Cr bond angle is X^@ . What is the exact value of X^@ ?

In the dichromate anion (Cr_2O_7^(2-))

In the dichromate anion (Cr_2O_7^(2-))

Assertion (A): Potassium dichromate is preferred to Na_(2)Cr_(2)O_(7) for use in volumetric analysis (titrations) Reason (R): Na_(2)Cr_(2)O_(7) is hygroscopic whilst the K_(2)Cr_(2)O_(7) is not Which of the following is correct ?

Draw the structure of Cr_2O_7^(2-) ion.

What is the oxidation state of (i) Cr in dichromate ion (ii) Mn is manganate ion, (iii) Cr in CrO_5

The dichromate ion is in cquilibrium with chromate ion in aqucous Solution as: Cr_(2)O_(7)^(2-) (aq) + H_(2)O hArr 2 CrO_(4)^(2-)(aq) + 2H^(+)(aq) The oxonion has