Which of the following materials fall in the category of a "pure susbstance"?
Calcium oxide

Which of the following materials fall in the category of a "pure susbstance"? Brick

Which of the following materials fall in the category of a "pure susbstance"? Wood

Which of the following materials fall in the category of a "pure susbstance"? Air.

Which of the following materials fall in the category of a "pure susbstance"? Mercury

Which of the following materials fall in the category of a "pure susbstance"? Hydrochloric acid

Which of the following metal does not form MO type oxide?

Which of the following may be termed as pure substance-

Write the balanced chemical equations for the following reactions : Calcium carbonate + Hydrochloric acid rarr Calcium chloride + Water + Carbon dioxide

Which of the following is correct : Cells are formed de novo from abiotic materials.