Class XI Chemistry Atomic Structure 3

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Question 1

What is the lowest energy of the spectral line emitted by the hydrogen atom in the Lyman series ?

• A
• B
• C
• D

Question 2

In an electronic transition atom cannot emit

• Aγ-rays
• BInfra red radiations
• CVisible light
• DUltraviolet rays

Question 3

The angular momentum of electron in Li²⁺ was found to be . The distance of electron from nucleus is

• A1.69 A°
• B0.68 A°
• C2.82 A°
• D8.19 A°

Question 4

The measurement of the electron position is associated with an uncertainty in momentum, which is equal to 1 x 10^-18 g cm s^-1. The uncertainty in electron velocity is, (mass of an electron is 9 x 10^-28 g)

• A1 x 10⁹ cm s^-1
• B1 x 10⁶ cm s^-1
• C1 x10⁵ cms^-1
• D1 x 10¹¹ cm s^-1

Question 5

The energy of a photon having a wavelength of 3000 Å is

• A6.626 × 10^-19
• B6.626 × 10^-34
• C6.626 × 10^-3
• D6.626 × 10^-8

Question 6

Statement I: Radiations of frequency 1050 Hz are incident on a photosensitive surface. Photoemission takes place but photoelectrons have zero energy.
Statement II: Energy of incident photon is equal to work function.

• ABoth Statement 1 and Statement 2 are correct and Statement 2 is the correct explanation for Statement 1
• BBoth Statement 1 and Statement 2 are correct but Statement 2 is not the correct explanation for Statement 1
• CStatement 1 is correct but Statement 2 is incorrect
• DStatement 1 is incorrect but Statement 2 is correct

Question 7

The value of l for the dumb-bell shaped orbital is

• A3
• B2
• C1
• D0

Question 8

The quantum numbers for the outermost electron of an element are: n = 2, l = 0, m = 0, s = +. The atom is

• Aboron
• Bhydrogen
• Cberyllium
• Dlithium

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