Atomic Structure (KVPY Stream-SA (Class 11) Chemistry): Questions 15 - 18 of 30

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Question number: 15

» Atomic Structure » Nature of Electromagnetic Radiation

Assertion-Reason▾

Assertion (Ꭺ)

Threshold frequency is a characteristic for a metal.

Reason (Ꭱ)

Threshold frequency is a maximum frequency required for the ejection of electron from the metal surface.

Choices

Choice (4) Response

a.

Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ

b.

Ꭺ is true but Ꭱ is false

c.

Ꭺ is false but Ꭱ is true

d.

Both Ꭺ and Ꭱ are false

Question number: 16

» Atomic Structure » Rules for Filling Electrons in Orbitals

Appeared in Year: 2014

MCQ▾

Question

The order of increasing energies of the orbitals follows-

Choices

Choice (4) Response

a.

Equation

b.

Equation

c.

Equation

d.

Equation

Question number: 17

» Atomic Structure » Electronic Configuration of Elements

MCQ▾

Question

What is the complete ground state electron configuration for Equation ?

Choices

Choice (4) Response

a.

Equation

b.

Equation

c.

Equation

d.

Equation

Question number: 18

» Atomic Structure » Heisenberg Uncertainty Principle

Assertion-Reason▾

Assertion (Ꭺ)

If an electron is located within the range of 0.1 Å then the uncertainty in velocity is approximately Equation .

Equation

Reason (Ꭱ)

Trajectory (path of motion) of above electron can defined,

Choices

Choice (4) Response

a.

Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ

b.

Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ

c.

Ꭺ is false but Ꭱ is true

d.

Ꭺ is true but Ꭱ is false

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