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Q.

Given below are two statements:
Statement I: According to Bohr’s model of an atom, qualitatively the magnitude of velocity of electron increases with decrease in positive charges on the nucleus as there is no strong hold on the electron by the nucleus.


Statement II: According to Bohr’s model of an atom, qualitatively the magnitude of velocity of electron increases with decrease in principal quantum number. 

 

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a

Statement I is false but Statement II is true

b

Both Statement I and Statement II are false

c

Statement I is true but Statement II is false

d

Both Statement I and Statement II are true

answer is B.

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Detailed Solution

Velocity α zn

Hence statement-I is false.

Z = atomic number of atom, corresponds to +ve charge so as Z increase velocity increases so statement-I is wrong. and as 'n' decreases velocity increases so statement-II is correct.

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Given below are two statements:Statement I: According to Bohr’s model of an atom, qualitatively the magnitude of velocity of electron increases with decrease in positive charges on the nucleus as there is no strong hold on the electron by the nucleus.Statement II: According to Bohr’s model of an atom, qualitatively the magnitude of velocity of electron increases with decrease in principal quantum number.