Neutrons are found in atoms of all elements except in from Chemi

Subject

Chemistry

Class

JEE Class 12

Test Series

Take Zigya Full and Sectional Test Series. Time it out for real assessment and get your results instantly.

Test Yourself

Practice and master your preparation for a specific topic or chapter. Check you scores at the end of the test.
Advertisement

 Multiple Choice QuestionsMultiple Choice Questions

1.

Which of the following can be represented by the configuration [Kr] 5s2?

  • Ca

  • Sr

  • Ba

  • Ra


2.

2p orbitals have

  • n = 1; l = 2

  • n = 1; l = 0

  • n = 2; l = 1

  • n = 2; l = 0


3.

Aufbau principle is not satisfied by

  • Cr and Cl

  • Cu and Ag

  • Cr and Mg

  • Cu and Na


Advertisement

4.

Neutrons are found in atoms of all elements except in

  • chlorine

  • oxygen

  • argon

  • hydrogen


D.

hydrogen

Hydrogen is the only element which has no neutrons. In case of hydrogen atomic number and atomic weight is nearly same.


Advertisement
Advertisement
5.

The atomic weight of an element is 39. The number of neutrons in its nucleus is one more than the number of protons. The number of protons, neutrons and electrons-respectively in its atoms would be

  • 19, 20, 19

  • 19, 19, 20

  • 20, 19, 19

  • 20, 19, 20


6.

Out of the following electronic configurations the one of a transition element, is

  • 1s2, 2s2 2p6, 3s2 3p6 3d10, 4s2 4p6

  • 1s2, 2s2p6, 3s2 3p6 3d3, 4s2

  • 1s2, 2s2 2p6, 3s2 3p6, 4s2

  • 1s2, 2s2 2p6, 3s2 3p6 3d10, 4s2 4p1


7.

A covalent bond between two atoms is formed by which of the following?

  • Electron nuclear attraction

  • Electron sharing

  • Electron transfer

  • Electrostatic attraction


8.

Hybridisation involves

  • addition of an electron pair

  • mixing up of atomic orbitals

  • removal of an electron pair

  • separation of orbitals


Advertisement
9.

On the basis of Molecular Orbital Theory (MOT) which molecule does not exist?

  • H2

  • He2+

  • He2

  • Li2


10.

Which of the following compounds in liquid state does not have hydrogen bonding?

  • H2O

  • HF

  • NH3

  • C6H6


Advertisement