Unanswerd questions under tag substance

0 votes

Which of these substances is composed of only two elements – hydrogen and oxygen? [MCQ]

posted Sep 3, 2018 by Alok Dev

• elements
• chemistry
• substance

0 votes

0 answers

What substance is the most used man-made material in the world?

posted May 6, 2016 by anonymous

• earth
• substance
• human