Some precious stones such as ruby and sapphire consist of...
Some precious stones such as ruby and sapphire consist of aluminum oxide coloured by traces of the oxides of
group lV elements
group l metals
transition metals
alkaline earths
the halogens
Correct answer is C
No explanation has been provided for this answer.
The periodic classification of elements is an arrangement of the elements in order of their ...
What is the chemical symbol for Hydrogen? ...
An oxide XO2 has a vapour density of 32. What is the atomic mass of X?...
Which of the following describes the chemical property of acids? ...
Which of the following is a solvent for perfumes? ...
The contact process is used for the industrial production of ...