Match List ‐ I (Experiment performed) with List ‐ II (Phenomena discovered/associated)and select the correct option from the options given below the lists List-I List-II ( a ) Davisson and Germer experiment i Wave nature of electrons b Millikan's oil drop experiment ii Charge of an electron c Rutherford experiment iii Quantisation of energy levels d Franck-Hertz experiment ( iv ) Existence of the nucleus

( a ) ‐ ( i ) , ( b ) ‐ ( ii ) , ( c ) ‐ ( iv ) , ( d ) ‐ ( iii )

( a ) ‐ ( iii ) , ( b ) ‐ ( iv ) , ( c ) ‐ ( i ) , ( d ) ‐ ( ii )

( a ) ‐ ( iv ) , ( b ) ‐ ( iii ) , ( c ) ‐ ( ii ) , ( d ) ‐ ( i )

( a ) ‐ ( i ) , ( b ) ‐ ( ii ) , ( c ) ‐ ( iii ) , ( d ) ‐ ( iv )

Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R. Assertion A: Loss of electron from hydrogen atom results in nucleus of ~ 1 . 5 × 10 – 3 pm size. Reason R: Proton H + always exists in combined form. In the light of the above statements, choose the most appropriate answer from the options given below:

Both A and R are correct but R is NOT the correct explanation of A

Both A and R are correct and R is the correct explanation of A

A is correct but R is not correct

A is not correct but R is correct

EASY

Earn 100

Which of the following is never true for cathode rays?

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Important Questions on Structure of Atom

HARD

Chemistry>Physical Chemistry>Structure of Atom>Discovery of Sub-Atomic Particles

Consider a hypothetical case in which the charge of a proton is twice as that of an electron. Using this hypothetical case, how many protons

(P),

neutrons

(N)

and electrons

(E)

would a neutral

{}^{23}{Na}

atom contain?

EASY

Chemistry>Physical Chemistry>Structure of Atom>Discovery of Sub-Atomic Particles

Which of the following is the correct unit of angular momentum of an electron in an orbital of an atom ?

EASY

Chemistry>Physical Chemistry>Structure of Atom>Discovery of Sub-Atomic Particles

An element with mass number

181

contains

32 %

more neutrons as compared to protons. What is the symbol of that element?

MEDIUM

Chemistry>Physical Chemistry>Structure of Atom>Discovery of Sub-Atomic Particles

Which of the following pairs of iron are isoelectronic and isostructural?

EASY

Chemistry>Physical Chemistry>Structure of Atom>Discovery of Sub-Atomic Particles

The number of times the comparative mass of a neutron is heavier than an electron is:

MEDIUM

Chemistry>Physical Chemistry>Structure of Atom>Discovery of Sub-Atomic Particles

The correct set of four quantum numbers for the valence electrons of rubidium atom

(Z = 37)

EASY

Chemistry>Physical Chemistry>Structure of Atom>Discovery of Sub-Atomic Particles

The number of electrons, protons and neutrons in a species are equal to

10, 11

and

12

respectively. The proper symbol-of the species is

EASY

Chemistry>Physical Chemistry>Structure of Atom>Discovery of Sub-Atomic Particles

The isoelectronic set of ions is:

EASY

Chemistry>Physical Chemistry>Structure of Atom>Discovery of Sub-Atomic Particles

Amongst the following statements, that which was not proposed by Dalton was :

MEDIUM

Chemistry>Physical Chemistry>Structure of Atom>Discovery of Sub-Atomic Particles

Electrons in a cathode ray tube have been emitted with a velocity of $1000 {ms}^{- 1}$ . The number of following statements which is/are true about the emitted radiation is

Given : $h = 6 \times 10^{- 34} Js, m_{e} = 9 \times 10^{- 31} kg$

(A ) The deBroglie wavelength of the electron emitted is $666.67 nm$

(B ) The characteristic of electrons emitted depend upon the material of the electrodes of the cathode ray tube.

(D ) The nature of the emitted electrons depends on the nature of the gas present in cathode ray tube..

MEDIUM

Chemistry>Physical Chemistry>Structure of Atom>Discovery of Sub-Atomic Particles

Which of the following pairs of ions is isoelectronic and isostructural?

EASY

Chemistry>Physical Chemistry>Structure of Atom>Discovery of Sub-Atomic Particles

Arrange the following particles in an increasing order of values of

e / m

ratio: electron

(e),

proton

(p),

neutron

(n)

and

α

-particle

(α) -

EASY

Chemistry>Physical Chemistry>Structure of Atom>Discovery of Sub-Atomic Particles

Among the following species which option contains all isoelectronic species?

EASY

Chemistry>Physical Chemistry>Structure of Atom>Discovery of Sub-Atomic Particles

The nitride ion in lithium nitride is composed of

EASY

Chemistry>Physical Chemistry>Structure of Atom>Discovery of Sub-Atomic Particles

Match List $‐ I$ (Experiment performed) with List $‐ II$ (Phenomena discovered/associated)and select the correct option from the options given below the lists

	List-I		List-II
$(a)$	Davisson and Germer experiment	$(i)$	Wave nature of electrons
$(b)$	Millikan's oil drop experiment	$(ii)$	Charge of an electron
$(c)$	Rutherford experiment	$(iii)$	Quantisation of energy levels
$(d)$	Franck-Hertz experiment	$(iv)$	Existence of the nucleus

EASY

Chemistry>Physical Chemistry>Structure of Atom>Discovery of Sub-Atomic Particles

Hydrogen has three isotopes

(A), (B)

and

(C) .

If the number of neutron(s) in

(A), (B)

and

(C)

respectively, are

(x), (y)

and

(z),

the sum of

(x), (y)

and

(z)

EASY

Chemistry>Physical Chemistry>Structure of Atom>Discovery of Sub-Atomic Particles

B e^{2 +}

is isoelectronic with which of the following ions?

HARD

Chemistry>Physical Chemistry>Structure of Atom>Discovery of Sub-Atomic Particles

Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R.

Assertion A: Loss of electron from hydrogen atom results in nucleus of $~ 1.5 \times 10^{- 3} pm$ size.

Reason R: Proton $(H^{+})$ always exists in combined form.

In the light of the above statements, choose the most appropriate answer from the options given below:

MEDIUM

Chemistry>Physical Chemistry>Structure of Atom>Discovery of Sub-Atomic Particles

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

EASY

Chemistry>Physical Chemistry>Structure of Atom>Discovery of Sub-Atomic Particles

The fundamental particles present in the nucleus of an atom are

Which of the following is never true for cathode rays?

Important Questions on Structure of Atom

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