Pradeep's Chemistry Vol 1>Chapter 2 - Structure of Atom>TEST YOUR GRIP>Q 12

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The radius of the first Bohr orbit of hydrogen atom is $0.59 Å .$ The radius of the third orbit of $H e^{+}$ will be

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Important Questions on Structure of Atom

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11th CBSE

IMPORTANT

Pradeep's Chemistry Vol 1>Chapter 2 - Structure of Atom>TEST YOUR GRIP>Q 13

The line spectrum of

H e^{+}

ion will resemble that of

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11th CBSE

IMPORTANT

Pradeep's Chemistry Vol 1>Chapter 2 - Structure of Atom>TEST YOUR GRIP>Q 14

In the Sommerfeld’s modification of Bohr’s theory, the trajectory of an electron in a hydrogen atom is

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Pradeep's Chemistry Vol 1>Chapter 2 - Structure of Atom>TEST YOUR GRIP>Q 15

When the electron of a hydrogen atom jumps from

n = 4

to

n = 1

state, the number of spectral lines emitted is

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Pradeep's Chemistry Vol 1>Chapter 2 - Structure of Atom>TEST YOUR GRIP>Q 16

Which of the following has largest de-Broglie wavelength, provided all have equal velocity?

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Pradeep's Chemistry Vol 1>Chapter 2 - Structure of Atom>TEST YOUR GRIP>Q 17

Which of the following relates to photons both as wave motion and as a stream of particles?

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Pradeep's Chemistry Vol 1>Chapter 2 - Structure of Atom>TEST YOUR GRIP>Q 18

The de Broglie wavelength of a ball of mass

10 g

moving with a velocity of

10 m s^{- 1}

is

(h = 6.626 \times 10^{- 34} J s)

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11th CBSE

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Pradeep's Chemistry Vol 1>Chapter 2 - Structure of Atom>TEST YOUR GRIP>Q 19

The position of both, an electron and a helium atom, is known within

1.0 n m .

Further, the momentum of the electron is known within

5.0 \times 10^{- 26} k g m s^{- 1} .

The minimum uncertainty in the measurement of momentum of helium atom is

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11th CBSE

IMPORTANT

Pradeep's Chemistry Vol 1>Chapter 2 - Structure of Atom>TEST YOUR GRIP>Q 20

Given: The mass of electron is

9.11 \times 10^{- 31} k g,

Planck constant is

6.626 \times 10^{- 34} Js,

the uncertainty involved in the measurement of velocity within a distance of

0.1 Å

is