Previous Year Papers

Download Solved Question Papers Free for Offline Practice and view Solutions Online.

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.

Some Basic Concepts of Chemistry

Short Answer Type

21.

Oxides of carbon illustrate which law of chemical combination?

180 Views

22.
Name three elements which make up more than 90 percent of the human body.

Oxygen is about 60 - 70%,
carbon just below 20% and
hydrogen about 10%

These three element make up more than 90 percent of the human body.

104 Views

23.

When two substances X and Y are mixed together, a new substance Z is formed with the evolution of heat. Properties of Z are different from those of X and Y. Is Z an element, compound or a mixture?

138 Views

24.

If water samples are taken from sea, rivers, clouds, lakes or snow, they will be found to contain hydrogen and oxygen in the appropriate ratio of 1 : 8. This illustrates which law of chemical combination?

217 Views