The correct set of quantum numbers for the unpaired electron of Cu atom is :

n = 4 , l = 0 , m = 0 , s = + 1 / 2

n = 3 , l = 2 , m = - 2 , s = + 1 / 2

n = 3 , l = 2 , m = + 2 , s = - 1 / 2

n = 4 , l = 1 , m = + 1 , s = + 1 / 2

A certain metal has a work function of Φ = 2 eV . It is irradiated first with 1 W of 400 nm light and later with 1 W of 800 nm light. Among the following, the correct statement is: [Given:Planck constant h = 6 . 626 × 10 - 34 m 2 kgs - 1 Speed of light ( c ) = 3 × 10 8 ms - 1 ]

400 nm light leads to more photoelectrons.

Both colors of light give rise to same number of photoelectrons.

400 nm light gives rise to less energetic photoelectrons than 800 nm light.

800 nm light leads to more photoelectrons.

Among the following, the correct statement about cathode ray discharge tube is

in the absence of external electrical or magnetic field, cathode rays travel in straight lines.

the electrical discharge can only be observed at high pressure and at low voltage.

the characteristics of cathode rays depend upon the material of electrodes.

the characteristics of cathode rays depend upon the gas present in the cathode ray tube.

EASY

KVPY Aptitude Test - Stream SA

IMPORTANT

Earn 100

Among the following, the incorrect statement is

100% studentsanswered this correctly

Important Questions on Structure of Atom

MEDIUM

KVPY Aptitude Test - Stream SA

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter 4 - Structure of Atom>KVPY Aptitude Test - Stream SA (19 Nov 2017)>Q 6

C_{60}

emerging from a source at a speed (v) has a de Broglie wavelength of

11.0 Å

. The value of v (in m

s^{- 1}

) is closest to

[Planck's constant

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

]

EASY

KVPY Aptitude Test - Stream SA

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter 4 - Structure of Atom>KVPY Aptitude Test - Stream SA (19 Nov 2017)>Q 7

The maximum number of electrons that can be filled in the shell with the principal quantum number

n = 4

EASY

KVPY Aptitude Test - Stream SA

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter 4 - Structure of Atom>KVPY Aptitude Test - Stream SA (5 Nov 2017)>Q 8

20 g

object is moving with velocity

100 {ms}^{- 1}

. The de Broglie wavelength (in

m

) of the object is [Planck's constant

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

]

EASY

KVPY Aptitude Test - Stream SA

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter 4 - Structure of Atom>KVPY Aptitude Test - Stream SA (5 Nov 2017)>Q 9

The maximum nuber of electrons that can be filled in the shell with the principal quantum number

n = 3

MEDIUM

KVPY Aptitude Test - Stream SA

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter 4 - Structure of Atom>KVPY Aptitude Test - Stream SA (5 Nov 2017)>Q 10

The photoelectric behaviour of $K, Li, Mg$ and $Ag$ metals is shown in the plot below. If light of wavelength $400 nm$ is incident on each of these metals, which of them will emit photoelectrons? [Planck's contant $h = 6.626 \times 10^{- 34} Js$ ; velocity of light $c = 3 \times 10^{8} {ms}^{- 1}; 1 eV = 1.6 \times 10^{- 19} J$ ]