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1
JEE Main 2021 (Online) 25th July Morning Shift
MCQ (Single Correct Answer)
+4
-1
At 298.2 K the relationship between enthalpy of bond dissociation (in kJ mol$$-$$1) for hydrogen (EH) and its isotope, deuterium (ED), is best described by :
A
$${E_H} = {1 \over 2}{E_D}$$
B
$${E_H} = {E_D}$$
C
$${E_H} \simeq {E_D} - 7.5$$
D
$${E_H} = 2{E_D}$$
2
JEE Main 2021 (Online) 22th July Evening Shift
MCQ (Single Correct Answer)
+4
-1
The water having more dissolved O2 is :
A
boiling water
B
water at 80$$^\circ$$C
C
polluted water
D
water at 4$$^\circ$$C
3
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
4
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.
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