JEE Main 2020 (Online) 3rd September Evening Slot | JEE Main Year Wise Previous Years Questions - ExamSIDE.Com

1

JEE Main 2020 (Online) 3rd September Evening Slot

MCQ (Single Correct Answer)

+4

-1

Complex A has a composition of H₁₂O₆Cl₃Cr. If the complex on treatment with conc.H₂SO₄ loses 13.5% of its original mass, the correct molecular formula of A is :
[Given: atomic mass of Cr = 52 amu and Cl = 35 amu]

A

[Cr(H₂O)₅Cl]Cl₂.H₂O

B

[Cr(H₂O)₄Cl₂]Cl.2H₂O

C

[Cr(H₂O)₃Cl₃].3H₂O

D

[Cr(H₂O)₆]Cl₃

2

JEE Main 2020 (Online) 3rd September Evening Slot

MCQ (Single Correct Answer)

+4

-1

The d-electron configuration of [Ru(en)₃ ]Cl₂
and [Fe(H₂O)₆]Cl₂ , respectively are :

A

$$t_{2g}^4e_g^2$$ and $$t_{2g}^6e_g^0$$

B

$$t_{2g}^6e_g^0$$ and $$t_{2g}^6e_g^0$$

C

$$t_{2g}^6e_g^0$$ and $$t_{2g}^4e_g^2$$

D

$$t_{2g}^4e_g^2$$ and $$t_{2g}^4e_g^2$$

3

JEE Main 2020 (Online) 3rd September Evening Slot

MCQ (Single Correct Answer)

+4

-1

The incorrect statement is :

A

In manganate and permanganate ions, the p-bonding takes place by overlap of p-orbitals of oxygen and d-orbitals of manganese

B

Manganate ion is green in colour and permanganate ion in purple in colour

C

Manganate and permanganate ions are paramagnetic

D

Manganate and permanganate ions are tetrahedral

4

JEE Main 2020 (Online) 3rd September Evening Slot

MCQ (Single Correct Answer)

+4

-1

The increasing order of the reactivity of the following compound in nucleophilic addition reaction is :

Propanal, Benzaldehyde, Propanone, Butanone

A

Butanone < Propanone < Benzaldehyde < Propanal

B

Benzaldehyde < Butanone < Propanone < Propanal

C

Propanal < Propanone < Butanone < Benzaldehyde

D

Benzaldehyde < Propanal < Propanone < Butanone

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