Which type of
chemical reaction takes place when coal and methane are burned in the presence
of air?
a) physical reaction
b) biological
reaction
c) chemical reaction
d) none of these
Which of the following is produced when coal is burned in the air?
a) carbon dioxide
b) oxygen
c) nitrogen
d) ozone
Which of the following is produced when natural gas (methane) is burned in the air?
a) carbon dioxide
b) nitrogen
c) carbon tetrachloride
d) oxygen
Which of the following is produced along with carbon dioxide when natural gas (methane) is burned in the air?
a) alcohol
b) water
c) carbon tetrachloride
d) benzene
Which of the following reaction takes place during the rusting of iron?
a) physical reaction
b) biological reaction
c) chemical reaction
d) none of these
Which of the following is/are required for the process of rusting?
a) oxygen
b) water
c) carbon
d) both a and b
Explanation:Rusting is an oxidation reaction. The iron reacts with water and oxygen to form hydrated iron(III) oxide, which we see as rust. Here is the word equation for the reaction:
iron + water + oxygen → hydrated iron(III) oxide.
