Question

Both $ C{O_2} $ and $ {H_2} $ gases are
(1) heavier than air
(2) colourless
(3) acidic in nature
(4) soluble in water.

Answer 1

Hint :Air is a mixture of colourless, odourless gases. It has nitrogen and oxygen as its main constituents. It contains smaller amounts of water vapor, argon, carbon dioxide, Sulphur dioxide etc. Air is a homogeneous mixture with uniformly distributed components.

Complete Step By Step Answer:
Properties of carbon dioxide $ (C{O_2}) $
 $ C{O_2} $ is a colourless gas.
 $ C{O_2} $ is acidic in nature.
 $ C{O_2} $ is highly soluble.
 $ C{O_2} $ is heavier than air.
Properties of $ {H_2} $ :
 $ {H_2} $ is a colourless gas.
 $ {H_2} $ is not acidic in nature.
 $ {H_2} $ is not soluble in water.
 $ {H_2} $ is less heavy than air.
From the above properties we can conclude that both $ C{O_2} $ and $ {H_2} $ are colourless gases.
Hence , option (2)colourless is correct. Carbon dioxide is acidic in nature because it reacts with water to produce carbonic acid.

Additional Information:
Carbon dioxide concentrations are rising in the atmosphere because of the burning of fossil fuels for energy. Standard Dry Air is the composition of gases that make up air at sea level. It is known as the standard scientific unit of measurement. It is made up of oxygen, nitrogen, argon, carbon dioxide, neon, helium, krypton, hydrogen and Xenon.

Note :
Earth’s atmosphere contains $ 78.08\% $ nitrogen, $ 20.95\% $ oxygen, $ 0.93\% $ argon, $ 0.04\% $ carbon dioxide and traces of hydrogen, helium and other noble gases. Carbon dioxide affects earth’s climate and plays a large role in the biosphere.