Chemistry Class-11: Chapter –2. Structure of Atom – Part-1

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Multiple Choice Questions

Questions 1:

Which of the following conclusions could not be derived from Rutherford’s particle scattering experiement?

(i) Most of the space in the atom is empty.

(ii) The radius of the atom is about 10–10 m while that of nucleus is 10–15 m.

(iii) Electrons move in a circular path of fixed energy called orbits.

(iv) Electrons and the nucleus are held together by electrostatic forces of attraction.

Answer: (iii)

Solution:

Questions-2

Which of the following options does not represent ground state electronic configuration of an atom?

(i)

(ii)

(iii)

(iv)

Answer: (ii)

Solution:

Questions-3

The probability density plots of 1s and 2s orbitals are given in Fig. 2.1:

Orbitals

Orbitals

Orbitals

The density of dots in a region represents the probability density of finding electrons in the region.

On the basis of above diagram which of the following statements is incorrect?

(i) 1s and 2s orbitals are spherical in shape.

(ii) The probability of finding the electron is maximum near the nucleus.

(iii) The probability of finding the electron at a given distance is equal in all directions.

(iv) The probability density of electrons for 2s orbital decreases uniformly as distance from the nucleus increases.

Answer: (iv)

Solution:

Questions-4

Which of the following statement is not correct about the characteristics of cathode rays?

(i) They start from the cathode and move towards the anode.

(ii) They travel in straight line in the absence of an external electrical or magnetic field.

(iii) Characteristics of cathode rays do not depend upon the material of electrodes in cathode ray tube.

(iv) Characteristics of cathode rays depend upon the nature of gas present in the cathode ray tube.

Answer: (iv)

Solution:

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