JEE Main 2020 (Online) 8th January Evening Slot | JEE Main Year Wise Previous Years Questions - ExamSIDE.Com

1

JEE Main 2020 (Online) 8th January Evening Slot

MCQ (Single Correct Answer)

+4

-1

The correct order of the calculated spin-only magnetic moments of complexs (A) to (D) is:
(A) Ni(CO)₄
(B) [Ni(H₂O)₆]Cl₂
(C) Na₂[Ni(CN)₄]
(D) PdCl₂(PPh₃)₂

A

(C) < (D) < (B) < (A)

B

(C) $$ \approx $$ (D) < (B) < (A)

C

(A) $$ \approx $$ (C) $$ \approx $$ (D) < (B)

D

(A) $$ \approx $$ (C) < (B) $$ \approx $$ (D)

2

JEE Main 2020 (Online) 8th January Evening Slot

MCQ (Single Correct Answer)

+4

-1

Kjeldahl's method cannot be used to estimate nitrogen for which of the following compounds?

A

C₆H₅NH₂

B

$${\rm{N}}{{\rm{H}}_2} - \mathop C\limits^{\mathop \parallel \limits^O } - {\rm{N}}{{\rm{H}}_2}$$

C

C₆H₅NO₂

D

CH₃CH₂-C $$ \equiv $$ N

3

JEE Main 2020 (Online) 8th January Evening Slot

MCQ (Single Correct Answer)

+4

-1

Hydrogen has three isotopes (A), (B) and (C). If the number of neutron(s) in (A), (B) and (C) respectively, are (x), (y) and (z), the sum of (x), (y) an (z) is :

A

3

B

1

C

4

D

2

4

JEE Main 2020 (Online) 8th January Evening Slot

MCQ (Single Correct Answer)

+4

-1

Two monomers in maltose are :

A

$$\alpha $$-D-glucose and $$\alpha $$-D-galactose

B

$$\alpha $$-D-glucose and $$\alpha $$-D-Fructose

C

$$\alpha $$-D-glucose and $$\alpha $$-D-glucose

D

$$\alpha $$-D-glucose and $$\beta $$-D-glucose

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