JEE Main 2021 (Online) 25th February Morning Shift | JEE Main Year Wise Previous Years Questions - ExamSIDE.Com

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1

JEE Main 2021 (Online) 25th February Morning Shift

MCQ (Single Correct Answer)

+4

-1

Which of the glycosidic linkage between galactose and glucose is present in lactose?

A

C-1 of galactose and C-6 of glucose

B

C-1 of glucose and C-6 of galactose

C

C-1 of galactose and C-4 of glucose

D

C-1 of glucose and C-4 of galactose

2

JEE Main 2021 (Online) 25th February Morning Shift

MCQ (Single Correct Answer)

+4

-1

According to molecular orbital theory, the species among the following that does not exist is :

A

$${O_2}^{2 - }$$

B

$$B{e_2}$$

C

$$H{e_2}^ - $$

D

$$H{e_2}^ + $$

3

JEE Main 2021 (Online) 25th February Morning Shift

MCQ (Single Correct Answer)

+4

-1

Complete combustion of 1.80 g of an oxygen containing compound (C_xH_yO_z) gave 2.64 g of CO₂ and 1.08 g of H₂O. The percentage of oxygen in the organic compound is :

A

51.63

B

50.33

C

63.53

D

53.33

4

JEE Main 2021 (Online) 25th February Morning Shift

MCQ (Single Correct Answer)

+4

-1

Out of Syllabus

The correct statement about B₂H₆ is :

A

Its fragment, BH₃, behaves as a Lewis base.

B

All B$$-$$H$$-$$B angles are of 120$$^\circ$$.

C

The two B$$-$$H$$-$$B bonds are not of same length.

D

Terminal B$$-$$H bonds have less p-character when compared to bridging bonds.

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