Which toxic element is present in the exhaust of automobiles?

Observe the diagram of the catalytic converter and answer the questions which follow: Name the other poisonous gas which is missing in the exhaust pollutsnt of an automobile in the above diagram.

Poisonous gas present in the exhaust fumes of car is

Name the elements present in wate (H_2O) .

How many elements are present in the each transition series?

How many elements are present in 4th period?

The most abudant element present in the plants is:

Name any two metals used in the catalytic converters of automobiles.

Name two toxic chemicals present in tobacco smoke.