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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) 8th April Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

Which of the following have same number of significant figures?

A. 0.00253

B. 1.0003

C. 15.0

D. 163

Choose the correct answer from the options given below

A
A, C and D only
B
B and C only
C
A, B and C only
D
C and D only
3
JEE Main 2023 (Online) 6th April Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

The volume of $$0.02 ~\mathrm{M}$$ aqueous $$\mathrm{HBr}$$ required to neutralize $$10.0 \mathrm{~mL}$$ of $$0.01 ~\mathrm{M}$$ aqueous $$\mathrm{Ba}(\mathrm{OH})_{2}$$ is (Assume complete neutralization)

A
7.5 mL
B
5.0 mL
C
10.0 mL
D
2.5 mL
4
JEE Main 2023 (Online) 31st January Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
When a hydrocarbon A undergoes complete combustion it requires 11 equivalents of oxygen and produces 4 equivalents of water. What is the molecular formula of $A$ ?
A
$\mathrm{C}_{9} \mathrm{H}_{8}$
B
$\mathrm{C}_{5} \mathrm{H}_{8}$
C
$\mathrm{C}_{11} \mathrm{H}_{4}$
D
$\mathrm{C}_{11} \mathrm{H}_{8}$
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