Chemistry Questions

Washing soda is used ______.

I. for removing permanent hardness of water

II. for disinfecting drinking water

III. as a cleaning agent for domestic purpose

Carbon dioxide is one of the gases that cause the _________.

Which of the following is NOT a waste material removed from blood in the kidney?

Elements having same atomic numbers but different mass number are called ______.

Which of the following statements are CORRECT?

I. Esters are sweet smelling substance.
II Esters are used in making perfumes.
III. Functional group of ester is R-O-RꞋ.

Isotopes have ______.

I. similar physical quantities and different chemical properties

II. different physical properties

III. similar chemical properties

___ is the number of shells for elements of the 3rd period.

Which category of Hydrogen releases water vapour and a by product when burnt?