Single Choice

In acidic medium, $$H_2O_2$$ changes $$Cr_2O_7^{- 2}$$ to $$CrO_5$$ which has two ($$-O- O-$$) bonds oxidation state of $$Cr$$ in $$CrO_5$$ is:

A5
B3
C6
Correct Answer
D-10

Solution

In acidic medium, $$H_2O_2$$ changes $$Cr_2O_7^{- 2}$$ to $$CrO_5$$ which has two ($$-O- O-$$) bonds.

$$K_2Cr_2O_7 + H_2SO_4 + 4H_2O_2 \rightarrow 2CrO_5 + K_2SO_4 + 5H_2O $$.


The oxidation state of $$Cr$$ in $$CrO_5$$ is +6.
Let $$X$$ be the oxidation state of $$Cr$$ in $$CrO_5$$.
$$X+(-2)+2(-2)=0$$
$$X=+6$$.

Hence, the correct option is $$C$$.

SIMILAR QUESTIONS

d - block and f - block Elements

Which of the following is an amphoteric oxide?

d - block and f - block Elements

Which of the following compound is blue?

d - block and f - block Elements

Which of the following oxides are basic in nature ?

d - block and f - block Elements

Zinc oxide is normally white but turns yellow on heating and becomes white again on cooling because of:

d - block and f - block Elements

The Oxidation states of $$Cr$$ in $$[Cr(H_2O)_6]Cl_3, [Cr(C_6H_6)_2]$$, and $$K_2[Cr(CN)_2(O)_2(O_2)(NH_3]$$ respectively are:

d - block and f - block Elements

Which of the following compounds is metallic and ferromagnetic?

d - block and f - block Elements

Name the oxometal anions of the first series of the transition metals in which the metal exhibits the oxidation state equal to its group number.

d - block and f - block Elements

$$Cr - C$$ bond in the compound $$[Cr(CO)_6]$$ shows $$\pi$$ - character due to :

d - block and f - block Elements

Passivity of iron is due to formation of:

d - block and f - block Elements

Fe is made passive by:

Contact Details