What do all organic molecules contain?
O
oxygen
O
water
o
O
carbon
O
nitrogen

Option C. Carbon.

Explanation:

Organic molecules are those molecules which contains carbon and hydrogen atoms. Organic molecules is also called hydrocarbon. In organic molecules, carbon is the main component. For example, glucose is an organic compound which is composed of six carbon, twelve hydrogen and six oxygen atoms. Formula of glucose is C6H12O6. So we can say that glucose is an organic molecule.

a gas, having a molecular weight of 13 kg/kmol and a kinematic viscosity of 0.25 cm2/s, flows through a pipe 0.25 m internal diameter and 5 km long at the rate of 0.4 m3/s and is delivered at atmospheric pressure.

c) should be the answer.