WB JEE 2022 | Atomic Structure Question 7 | Chemistry

WB JEE 2022

MCQ (Single Correct Answer)

-0.25

In Bohr model of atom, radius of hydrogen atom in ground state is r₁ and radius of He⁺ ion in ground state is r₂. Which of the following is correct?

$${{{r_1}} \over {{r_2}}} = 4$$

$${{{r_1}} \over {{r_2}}} = {1 \over 2}$$

$${{{r_1}} \over {{r_2}}} = {1 \over 4}$$

$${{{r_2}} \over {{r_1}}} = {1 \over 2}$$

WB JEE 2022

MCQ (Single Correct Answer)

-0.25

Which one of the following is the correct set of four quantum numbers (n, 1, m, s) ?

$$\left( {3,0, - 1, + {1 \over 2}} \right)$$

$$\left( {4,3, - 2, - {1 \over 2}} \right)$$

$$\left( {3,1, - 2, - {1 \over 2}} \right)$$

$$\left( {4,2, - 3, + {1 \over 2}} \right)$$

WB JEE 2021

MCQ (Single Correct Answer)

-0.5

The atomic masses of helium and neon are 4.0 and 20.0 amu respectively. The value of the de-Broglie wavelength of helium gas at $$-$$73$$^\circ$$C is M times the de-Broglie wavelength of neon at 727$$^\circ$$C. The value of M is

$${1 \over {5}}$$

$${1 \over {25}}$$

WB JEE 2020

MCQ (Single Correct Answer)

-0.25

The maximum number of electrons in an atom in which the last electron filled has the quantum numbers n = 3, l = 2 and m = $$ - $$ 1 is

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