In this section you will find thousands of questions of Chemistry, how to solve each of the questions and the correct answer.
You will have four options in each question, try to answer correctly and if you don't, you will have the option to see the solution or choose another answer.
If you want to know how to solve each question you can click on the option 'How to solve?'
Which of the following shows that air is a mixture?
I. It has varied composition from place to place. II. Its constituents can be separated by physical means. III. It contains unreactive noble gases.
I and II only
II and III only
I and III only
I, II and III
Which of the following is used to study the arrangement of particles in crystal lattices?
Alpha-particles
Beta-particles
Gamma-rays
X-rays
Group VII elements are
monoatomic
good oxidizing agents
highly electropositive
electron donors
The electronic configuration of Mg2+ is
1s² 2s² 2p6 3s² 3p²
1s² 2s² 2p6 3s²
1s² 2s² 2p6
1s² 2s² 2p4
A hydrogen atom which has lost an electron contains
one proton only
one neutron only
one proton and one neutron
one proton, one electron and one neutron
