Question : Haemoglobin has highest affinity for
 

Option 1: Oxygen

Option 2: Carbon dioxide

Option 3: Carbon monoxide

Option 4: Nitrogen

Question : The gas used to extinguish fire is

Option 1: Neon

Option 2: Nitrogen

Option 3: Carbon dioxide

Option 4: Carbon monoxide

Question : The element which is required by the plant in large quantity:

Option 1: Calcium

Option 2: Nitrogen

Option 3: Photophorus

Option 4: Sulphur

Question : Anant's mother advised him to not sleep under the trees at night as trees release ______ at night.

Option 1: Methane

Option 2: Carbon Dioxide

Option 3: Nitrogen

Option 4: Oxygen

Question : Dry ice is the solid form of:

Option 1: Air

Option 2: Carbon Dioxide

Option 3: Nitrogen

Option 4: Water