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1
JEE Main 2021 (Online) 20th July Evening Shift
MCQ (Single Correct Answer)
+4
-1
The single largest industrial application of dihydrogen is :
A
Manufacture of metal hybrides
B
Rocket fuel in space research
C
In the synthesis of ammonia
D
In the synthesis of nitric acid
2
JEE Main 2021 (Online) 20th July Morning Shift
MCQ (Single Correct Answer)
+4
-1
Given below are two statements : One is labelled as Assertion A and other is labelled as Reason R.

Assertion A : The dihedral angles in H2O2 in gaseous phase is 90.2$$^\circ$$ and in solid phase is 111.5$$^\circ$$.

Reason R : The change in dihedral angle in solid and gaseous phase is due to the difference in the intermolecular forces.

Choose the most appropriate answer from the options given below for A and R.
A
A is correct but R is not correct.
B
Both A and R are correct but R is not the correct explanation of A.
C
Both A and R are correct and R is the correct explanation of A.
D
A is not correct but R is correct.
3
JEE Main 2021 (Online) 18th March Evening Shift
MCQ (Single Correct Answer)
+4
-1
In basic medium, H2O2 exhibits which of the following reactions?

(A) Mn2+ $$ \to $$ Mn4+

(B) I2 $$ \to $$ I$$-$$

(C) PbS $$ \to $$ PbSO4

Choose the most appropriate answer from the options given below :
A
(B) only
B
(A), (B) only
C
(A) only
D
(A), (C) only
4
JEE Main 2021 (Online) 18th March Morning Shift
MCQ (Single Correct Answer)
+4
-1
Given below are two statements : One is labelled as Assertion A and the other labelled as reason R

Assertion A : During the boiling of water having temporary hardness, Mg(HCO3)2 is converted to MgCO3.

Reason R : The solubility product of Mg(OH)2 is greater than that of MgCO3.

In the light of the above statements, choose the most appropriate answer from the options given below :
A
Both A and R are true but R is not the correct explanation of A
B
A is true but R is false
C
Both A and R are true and R is the correct explanation of A
D
A is false but R is true
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