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1

### JEE Main 2021 (Online) 27th August Evening Shift

Numerical
The number of optical isomers possible for [Cr(C2O4)3]3$$-$$ is ____________.

## Explanation

The number of optical isomers for [Cr(C2O4)3]3$$-$$ is two. 2

### JEE Main 2021 (Online) 27th August Morning Shift

Numerical
1 mol of an octahedral metal complex with formula MCl3 . 2L on reaction with excess of AgNO3 gives 1 mol of AgCl. The denticity of Ligand L is ____________. (Integer answer)

## Explanation

MCl3 . 2L octahedral

$$\mathop {MC{l_3}.2L}\limits_{1\,mole} \buildrel {Ex.\,AgN{O_3}} \over \longrightarrow$$ 1 mole of AgCl

Its means that one Cl$$-$$ ion present in ionization sphere.

$$\therefore$$ formula = [MCl2L2]Cl

For octahedral complex coordination no. is 6

$$\therefore$$ L act as bidentate ligand
3

### JEE Main 2021 (Online) 27th July Evening Shift

Numerical
3 moles of metal complex with formula Co(en)2Cl3 gives 3 moles of silver chloride on treatment with excess of silver nitrate. The secondary valency of Co in the complex is ___________.

(Round off to the nearest integer)

## Explanation

$$3\left[ {Co{{(en)}_2}C{l_2}} \right]Cl + \mathop {AgN{o_3}}\limits_{(excess)} \to \mathop {3AgCl}\limits_{(white\,ppt.)}$$

Secondary valency of Co = 6

(C. N.)
4

### JEE Main 2021 (Online) 27th July Morning Shift

Numerical
The number of geometrical isomers possible in triamminetrinitrocobalt (III) is X and in trioxalatochromate (III) is Y. Then the value of X + Y is _______________.

## Explanation

Triamminetrinitrocobalt (III) $$\to$$ [Co(NO2)3(NH3)3]

trioxalatochromate (III) ion $$\to$$ [Cr(C2O4)3]3$$-$$[Co(NO2)3(NH3)3] X + Y = 2 + 0 = 2.0

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