JEE Main 2019 (Online) 9th January Morning Slot | JEE Main Year Wise Previous Years Questions - ExamSIDE.Com

1

JEE Main 2019 (Online) 9th January Morning Slot

MCQ (Single Correct Answer)

+4

-1

The one that is extensively used as a piezoelectric material is :

A

tridymite

B

amorphous silica

C

quartz

D

mica

2

JEE Main 2019 (Online) 9th January Morning Slot

MCQ (Single Correct Answer)

+4

-1

Arrange the following amines in the decreasing order of basicity :

JEE Main 2019 (Online) 9th January Morning Slot Chemistry - Compounds Containing Nitrogen Question 225 English

JEE Main 2019 (Online) 9th January Morning Slot Chemistry - Compounds Containing Nitrogen Question 225 English

A

I > II > III

B

III > I > II

C

III > II > I

D

I > III > II

3

JEE Main 2019 (Online) 9th January Morning Slot

MCQ (Single Correct Answer)

+4

-1

20 mL of 0.1 M H₂SO₄ solution is added to 30 mL of of 0.2 M NH₄OH solution. The pH of the resultant mixture is : [pk_b of NH₄OH = 4.7].

A

5.2

B

9.0

C

5.0

D

9.4

4

JEE Main 2019 (Online) 9th January Morning Slot

MCQ (Single Correct Answer)

+4

-1

According to molecular orbital theory, which of the following is true with respect to Li₂⁺ and Li₂^$$-$$ ?

A

$$Li_2^ + $$ is unstable and $$Li_2^ - $$ is stable

B

$$Li_2^ + $$ is stable and $$Li_2^ - $$ unstable

C

Both are stable

D

Both are unstable

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