1
JEE Main 2022 (Online) 30th June Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

A $$\mathrel{\mathop{\kern0pt\longrightarrow} \limits_{}^{573\,K}} $$ Red phosphorus $$\mathrel{\mathop{\kern0pt\longrightarrow} \limits_{under\,pressure}^{heat\,;\,803\,K}} $$ B

Red phosphorus is obtained by heating "A" at 573 K, and can be converted to "B" by heating at 803 K under pressure.

A and B, respectively, are

A
$$\beta$$-black phosphorus and white phosphorus.
B
white phosphorus and $$\beta$$-black phosphorus.
C
$$\alpha$$-black phosphorus and white phosphorus.
D
white phosphorus and $$\alpha$$-black phosphorus.
2
JEE Main 2022 (Online) 29th June Evening Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language

Aqueous solution of which of the following boron compounds will be strongly basic in nature?

A
NaBH4
B
LiBH4
C
B2H6
D
Na2B4O7
3
JEE Main 2022 (Online) 29th June Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

Sulphur dioxide is one of the components of polluted air. SO2 is also a major contributor to acid rain. The correct and complete reaction to represent acid rain caused by SO2 is :

A
2SO2 + O2 $$\to$$ 2SO3
B
SO2 + O3 $$\to$$ SO3 + O2
C
SO2 + H2O2 $$\to$$ H2SO4
D
2SO2 + O2 + 2H2O $$\to$$ 2H2SO4
4
JEE Main 2022 (Online) 29th June Morning Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language

Match List-I with List-II.

List-I
(Metal)
List-II
(Application)
(A) Cs (I) High temperature thermometer
(B) Ga (II) Water repellent sprays
(C) B (III) Photoelectric cells
(D) Si (IV) Bullet proof vest

Choose the most appropriate answer from the options given below :

A
(A)-(III), (B)-(I), (C)-(IV), (D)-(II)
B
(A)-(IV), (B)-(III), (C)-(II), (D)-(I)
C
(A)-(II), (B)-(III), (C)-(IV), (D)-(I)
D
(A)-(I), (B)-(IV), (C)-(II), (D)-(III)
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