1
JEE Main 2023 (Online) 10th April Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

The number of molecules and moles in 2.8375 litres of O$$_2$$ at STP are respectively

A
1.505 $$\times$$ 10$$^{23}$$ and 0.250 mol
B
7.527 $$\times$$ 10$$^{22}$$ and 0.250 mol
C
7.527 $$\times$$ 10$$^{23}$$ and 0.125 mol
D
7.527 $$\times$$ 10$$^{22}$$ and 0.125 mol
2
JEE Main 2023 (Online) 10th April Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

The one that does not stabilize 2$$^\circ$$ and 3$$^\circ$$ structures of proteins is

A
$$-$$O $$-$$O $$-$$linkage
B
$$-$$S $$-$$S $$-$$linkage
C
van der Waals forces
D
H-bonding
3
JEE Main 2023 (Online) 10th April Morning Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language

Lime reacts exothermally with water to give 'A' which has low solubility in water. Aqueous solution of 'A' is often used for the test of CO$$_2$$, a test in which insoluble B is formed. If B is further reacted with CO$$_2$$ then soluble compound is formed, 'A' is :

A
Quick lime
B
White lime
C
Lime water
D
Slaked lime
4
JEE Main 2023 (Online) 10th April Morning Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language

Which of the following is used as a stabilizer during the concentration of sulphide ores?

A
Cresols
B
Xanthates
C
Fatty acids
D
Pine oils
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