Single Choice

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:

A$$+3, 0$$ and $$+6$$
Correct Answer
B$$+3, 0$$ and $$+4$$
C$$+3, +4$$ and $$+6$$
D$$+3, +2$$ and $$+4$$

Solution

The Oxidation states of $$Cr$$ let be $$x$$ in

1: $$[Cr(H_2O)_6]Cl_3$$
$$x+6\times 0+3\times(-1)=0$$
$$x=+3$$

2.$$ [Cr(C_6H_6)_2]$$
$$x+2\times 0=0$$
$$x=0$$

3. $$K_2[Cr(CN)_2(O)_2(O_2)(NH_3)]$$
$$2\times (+1)+x+2\times (-1)+(-2)\times2-2+0=0$$
$$x=+6$$

Therefore option B is correct.

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

Which of the following compounds is metallic and ferromagnetic?

d - block and f - block Elements

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:

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:

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