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

atoms of same elements having different mass number

atoms of different elements having same mass number

atoms of same elements having same mass number

atoms of different elements having same number of neutrons

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 )

EASY

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The nature of anode rays depends upon

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Important Questions on Structure of Atom

EASY

Chemistry>Physical Chemistry>Structure of Atom>Cathode Rays and Positive Rays

Among the following species which option contains all isoelectronic species?

MEDIUM

Chemistry>Physical Chemistry>Structure of Atom>Cathode Rays and Positive Rays

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

(Z = 37)

MEDIUM

Chemistry>Physical Chemistry>Structure of Atom>Cathode Rays and Positive Rays

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

EASY

Chemistry>Physical Chemistry>Structure of Atom>Cathode Rays and Positive Rays

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>Cathode Rays and Positive Rays

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

EASY

Chemistry>Physical Chemistry>Structure of Atom>Cathode Rays and Positive Rays

B e^{2 +}

is isoelectronic with which of the following ions?

MEDIUM

Chemistry>Physical Chemistry>Structure of Atom>Cathode Rays and Positive Rays

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

EASY

Chemistry>Physical Chemistry>Structure of Atom>Cathode Rays and Positive Rays

In the following sets of ions, which one is not isoelectronic with the rest of the species?

HARD

Chemistry>Physical Chemistry>Structure of Atom>Cathode Rays and Positive Rays

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:

EASY

Chemistry>Physical Chemistry>Structure of Atom>Cathode Rays and Positive Rays

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>Cathode Rays and Positive Rays

The number of protons, neutrons and electrons in

_{71}^{175} Lu

, respectively, are

EASY

Chemistry>Physical Chemistry>Structure of Atom>Cathode Rays and Positive Rays

The fundamental particles present in the nucleus of an atom are

EASY

Chemistry>Physical Chemistry>Structure of Atom>Cathode Rays and Positive Rays

Which of the following are isoelectronic species?

I. $\overset{+}{C} H_{3}$

II. ${NH}_{2}^{-}$

III. ${NH}_{4}^{+}$

IV. ${NH}_{3}$

EASY

Chemistry>Physical Chemistry>Structure of Atom>Cathode Rays and Positive Rays

The isoelectronic set of ions is:

EASY

Chemistry>Physical Chemistry>Structure of Atom>Cathode Rays and Positive Rays

Isotopes are

MEDIUM

Chemistry>Physical Chemistry>Structure of Atom>Cathode Rays and Positive Rays

The number of protons, neutrons and electrons in

{}_{6}^{13}C

respectively are

EASY

Chemistry>Physical Chemistry>Structure of Atom>Cathode Rays and Positive Rays

From the following pairs of ions which one is not an iso-electronic pair?

EASY

Chemistry>Physical Chemistry>Structure of Atom>Cathode Rays and Positive Rays

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

MEDIUM

Chemistry>Physical Chemistry>Structure of Atom>Cathode Rays and Positive Rays

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

EASY

Chemistry>Physical Chemistry>Structure of Atom>Cathode Rays and Positive Rays

Arrange the following particles in an increasing order of values of

e / m

ratio: electron

(e),

proton

(p),

neutron

(n)

and

α

-particle

(α) -

The nature of anode rays depends upon

Important Questions on Structure of Atom

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