Is air an element or mixture?

Cement is a mixture of

Which of the following is a heterogeneous mixture?

Which is the most abundant inert gas element in air?

A heterogenous mixture

Which pair of elements on combustion in air give superoxides ?

Statement-I Air is homogeneous mixture of many gases. Statement-II: They are separated by fractional distillation.

What is a mixture?

Which of the following pair of elements will give superoxides and peroxides respectively when heated in excess of air?

The heating process for the extraction of elements are quite old but highly acceptable method for the extraction of elements. Become in this process the elements produced is in the highly pure state. Mostly As, Sb,Ni, Zr,B etc are prepared by this principle 4 mumber of metal sulphides which may be reated first in air to partially convert them to the aride, and then further roasted in the absence of air, wing self reduction. In the purification Zr and Ti, which of the following is/are true