Fuel Cells

Q. Which of the following statement regarding fuel cell is not true?

1. They have efficiency of about 70%
2. They use inexpensive fuels.
3. Its efficiency is less then conventional methods
4. They do not cause pollution

Q.

The advantage of fuel cells is that they can be:

1. recharged by adding fuel

2. made to run very quietly

3. less polluting

4. all of the above

Q.

a fuel gas x combustion gives 2.2 kg co2 and 1.8 kg h2o only write the

1) emppirial formula

2) molecular mass

3) its 2 uses as fuel