1
JEE Main 2022 (Online) 26th June Evening Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language

The role of depressants in 'Froth Flotation method' is to

A
selectively prevent one component of the ore from coming to the froth.
B
reduce the consumption of oil for froth formation.
C
stabilize the froth.
D
enhance non-wettability of the mineral particles.
2
JEE Main 2022 (Online) 26th June Evening Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language

Boiling of hard water is helpful in removing the temporary hardness by converting calcium hydrogen carbonate and magnesium hydrogen carbonate to :

A
CaCO3 and Mg(OH)2
B
CaCO3 and MgCO3
C
Ca(OH)2 and MgCO3
D
Ca(OH)2 and Mg(OH)2
3
JEE Main 2022 (Online) 26th June Evening Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language

s-block element which cannot be qualitatively confirmed by the flame test is :

A
Li
B
Na
C
Rb
D
Be
4
JEE Main 2022 (Online) 26th June Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

The oxide which contains an odd electron at the nitrogen atom is :

A
N2O
B
NO2
C
N2O3
D
N2O5
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