Question

In acidic medium H2O2 changes K2Cr2O7 to CrO5 (deep violet solution in ether) having two peroxy linkage. Oxidation number of Cr in CrO5 is:

Solution

Correct option is

+ 6

 

 it has two peroxy linkage thus, x – 4 (for two peroxy linkage) – 2 (for oxygen) = 0

 

SIMILAR QUESTIONS

Q1

At pH = 4,  exists as:

Q2

Hg­2Cl2 ionises as ……... and cation has ……… unpaired electron (s).

Q3

Transition metals form alloys easily. The reason for this is

Q4

An inorganic compound on strong heating gave a blackish brown powder and two oxides of sulphur. The powder was dissolved in HCl when a yellow solution was obtained which gave a blood red coloured solution with thiocyanide ions. The inorganic compound may be

Q5

The species that undergoes disproprotionation in an alkaline medium are

Q6

In industrial smog, Cu corrodes to

Q7

IE1 of Cu (3d10 4s1) is less than that of Zn (3d10 4s2) because it is easy to remove an electron from a half-filled s-orbital as compared to fully-filled s-orbital. However, in case of IE2, the electron is lost from 3d orbital of Cu and 4s orbital of Zn and loss of electron from 4s orbital is easier as compared to fully-filled 3d orbital.