Subject :NSO Class : Class 7
Read the following statements.
(i) I am present in air.
(ii) I leave your lungs when you breathe out.
(iii) Plants needs me to prepare food.
Which of the following gases is being described by the above statements?
ACarbon dioxide
BNitrogen
CHydrogen
DOxygen
how it can be Hydrogen
Ans 1:
Class : Class 9
it must be carbon dioxide
Ans 2:
Class : Class 7
A
Ans 3:
Class : Class 7
it should be carbon dioxide (CO2)
Ans 4:
Class : Class 9
It is not.It is carbon dioxide.(a)