Self-test questions: Chapter 03

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JJ Thomson discovered what fundamental particle?

Proton

Electron

Atom

Neutron

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What is the frequency of light generated by an X-ray tube operating with a wavelength of 154 pm.

1.95 x 10¹⁸ Hz.

1.95 x 10¹⁴ Hz.

6.51 x 10^-21 Hz.

1.95 x 10¹⁶ Hz.

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What is the energy of a mole of x-ray photons with a frequency of 2.31 x 10¹⁸ Hz?

9.22 x 10² kJmol^-1

9.22 x 10¹¹ kJmol^-1

9.22 x 10⁵ kJmol^-1

9.22 x 10⁸ kJmol^-1

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When white light from a bulk is passed through a prism, it gives a continuous spectrum (unbroken distribution of continuous frequency). If an electric discharge is passed through a sample of hydrogen, which one of the following occurs when light passes through the sample and is split by a prism

Discrete frequencies are missing characteristic of H₂

Discrete frequencies are missing characteristic of H

A continuous absorption spectrum is observed

A continuous emission spectrum is observed

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The spectrum consisting of dark lines on a bright background is called?

A light spectrum

An absorption spectrum

An emission spectrum

A dark spectrum

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Which of the following can be explained by Bohr theory?

Transitions of electrons in the atomic spectrum of hydrogen

Transitions of electrons in the molecular spectrum of fluorine.

Why an electron emitting radiation does not collapse into the nucleus

Why only certain values of are allowed

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How many electrons are needed to fill all the atomic orbitals in the n=3 shell?

2

6

18

32

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What atomic orbital has the quantum number n = 7, l =3

7s

7p

7f

7d

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How would you expect the atomic radius to change in the series B, C and N?

B>C>N

N>C>B

C>B>N

N<C>B

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Put the following elements in decreasing order of first ionisation energy

C, N, O

N, O, C

C, O, N

N, C, O

Self-test questions: Chapter 03

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