This chapter is currently out of syllabus
1
JEE Main 2021 (Online) 27th August Evening Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
Which one of the following is used to remove most of plutonium from spent nuclear fuel?
A
ClF3
B
O2F2
C
I2O5
D
BrO3
2
JEE Main 2021 (Online) 27th August Morning Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
The gas 'A' is having very low reactivity reaches to stratosphere. It is non-toxic and non-flammable but dissociated by UV-radiations in stratosphere. The intermediates formed initially from the gas 'A' are :
A
$$Cl\mathop O\limits^ \bullet + \mathop C\limits^ \bullet {F_2}Cl$$
B
$$Cl\mathop O\limits^ \bullet + C\mathop {{H_3}}\limits^ \bullet $$
C
$$\mathop C\limits^ \bullet {H_3} + C\mathop {{F_2}}\limits^ \bullet Cl$$
D
$$\mathop C\limits^ \bullet l + C\mathop {{F_2}}\limits^ \bullet Cl$$
3
JEE Main 2021 (Online) 26th August Evening Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).

Assertion (A) : Photochemical smog causes cracking of rubber.

Reason (R) : Presence of ozone, nitric oxide, acrolein, formaldehyde and peroxyacetyl nitrate in photochemical smog makes it oxidizing.

Choose the most appropriate answer from the options given below :
A
Both (A) and (R) are true but (R) is not the true explanation of (A)
B
(A) is false but (R) is true.
C
(A) is true but (R) is false.
D
Both (A) and (R) are true and (R) is the true explanation of (A)
4
JEE Main 2021 (Online) 26th August Morning Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
The conversion of hydroxyapatite occurs due to presence of F$$-$$ ions in water. The correct formula of hydroxyapatite is :
A
[3Ca3(PO4)2 . Ca(OH)2]
B
[3Ca(OH)2 . CaF2]
C
[Ca3(PO4)2 . CaF2]
D
[3Ca3(PO4)2 . CaF2]
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