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1
JEE Main 2021 (Online) 31st August Evening Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
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Which one of the following statements is incorrect?
A
Atomic hydrogen is produced when H2 molecules at a high temperature are irradiated with UV radiation.
B
At around 2000 K, the dissociation of dihydrogen into its atoms is nearly 8.1%
C
Bond dissociation enthalpy of H2 is highest among diatomic gaseous molecules which contain a single bond.
D
Dihydrogen is produced on reacting zinc with HCl as well as NaOH(aq).
2
JEE Main 2021 (Online) 31st August Morning Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
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Given below are two statements :

Statement I : The process of producing syn-gas is called gasification of coal.

Statement II : The composition of syn-gas is CO + CO2 + H2 (1 : 1 : 1)

In the light of the above statements, choose the most appropriate answer from the options given below :
A
Statement I is false but Statement II is true
B
Statement I is true but Statement II is false
C
Both Statement I and Statement II are false
D
Both Statement I and Statement II are true
3
JEE Main 2021 (Online) 27th August Evening Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
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The oxide that gives H2O2 most readily on treatment with H2O is :
A
PbO2
B
Na2O2
C
SnO2
D
BaO2 . 8H2O
4
JEE Main 2021 (Online) 27th August Morning Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
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Deuterium resembles hydrogen in properties but :
A
reacts slower than hydrogen
B
reacts vigorously than hydrogen
C
reacts just as hydrogen
D
emits $$\beta$$+ particles
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