1
JEE Main 2022 (Online) 28th June Morning Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
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The incorrect statement about the imperfections in solids is :

A
Schottky defect decreases the density of the substance.
B
Interstitial defect increases the density of the substance.
C
Frenkel defect does not alter the density of the substance.
D
Vacancy defect increases the density of the substance.
2
JEE Main 2022 (Online) 28th June Morning Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
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The Zeta potential is related to which property of colloids?

A
Colour
B
Tyndall effect
C
Charge on the surface of colloidal particles
D
Brownian movement
3
JEE Main 2022 (Online) 28th June Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

Element "E" belongs to the period 4 and group 16 of the periodic table. The valence shell electron configuration of the element, which is just above "E" in the group is

A
3s2, 3p4
B
3d10, 4s2, 4p4
C
4d10, 5s2, 5p4
D
2s2, 2p4
4
JEE Main 2022 (Online) 28th June Morning Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language

Given are two statements one is labelled as Assertion A and other is labelled as Reason R.

Assertion A : Magnesium can reduce Al2O3 at a temperature below 1350$$^\circ$$C, while above 1350$$^\circ$$C, while above 1350$$^\circ$$C aluminium can reduce MgO.

Reason R : The melting and boiling points of magnesium are lower than those of aluminium.

n light of the above statements, choose most appropriate answer from the options given below :

A
Both A and R are correct, and R is correct explanation of A.
B
Both A and R are correct, but R is NOT the correct explanation of A.
C
A is correct R is not correct.
D
A is not correct, R is correct.
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