JEE Main 2023 (Online) 10th April Morning Shift | Some Basic Concepts of Chemistry Question 38 | Chemistry | JEE Main - ExamSIDE.com

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1

JEE Main 2023 (Online) 10th April Morning Shift

MCQ (Single Correct Answer)

+4

-1

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

Out of Syllabus

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

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

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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