Choose the correct option for the below-given statements.

Statement I: In Bohr’s model, the velocity of electrons increases with a decrease in the positive charge of the nucleus as electrons are not held tightly.

Statement II: Velocity decreases with an increase in principal quantum number.

a. Statement I is correct & Statement II is correct

b. Statement I is correct & Statement II is incorrect

c. Statement I is incorrect & Statement II is incorrect

d. Statement I is incorrect & Statement II is correct

Solution:

Answer: (d)

For Statement I:

According to Bohr’s model,

Velocity of electron, [latex]V_{n} = v_{o}\tfrac{z}{n}[/latex]

Where, vo = 2.18 × 106 /

So, with a decrease in z, Vn will also decrease

Hence, Statement I is incorrect,

For Statement II:

With an increase in n, velocity will decrease as per the relation given above,

Hence, Statement II is correct

Hence, option d) is correct.

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