Chemistry Past Questions and Answers

An atom X consist of 6 protons, 6 electrons and 7 neutrons. Which of the following representations of the atom is correct?

How many electron are present in 94Be2+?

When element \(_{20}\)Y combines with element \(_8\)Z, it forms

The boiling points of HF, H2O and NH3 increase in the order of

Chemicals that are produced in small quantities and with very degree of purity are