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Question

Which of the following is true about CO2?


  1. It is a colourless, odourless and tasteless gas

  2. It dissolves in water to form carbonic acid.

  3. It reduces to CO When passed through red hot coke

  4. It can turn lime water milky


Solution

The correct options are
A

It is a colourless, odourless and tasteless gas


B

It dissolves in water to form carbonic acid.


C

It reduces to CO When passed through red hot coke


D

It can turn lime water milky


To answer this question, Let's look at the properties of CO2.

CO2 is a colourless, odourless and tasteless gas and is about 1.5 times heavier than air.

Unlike CO2 it is not poisonous in nature. However, it does not support life and animals die in it for want of oxygen.

CO2 dissolves in water to form carbonic acid (H2CO3) in very small amount, and most of the dissolved CO2 remains loosely hydrated.
CO2,therefore, is also known as carbonic anhydride.

CO2(g)+H2O(l)H2CO3(l)

Carbonic acid is a weak dibasic acid, highly unstable and thus cannot be isolated. It forms two series of salts, i.e. hydrogen carbonates and carbonates derived from the anions

HCO3 and CO23

                                     H2CO3(aq) + H2O(l) HCO3(aq) + H3O(aq)

                                     HCO3(aq) + H2O(l) CO23(aq) + H3O(aq)

When passed through red-hot coke, it is reduced to carbon monoxide, CO.

CO2, when bubbled through lime water, Ca(OH)2, initially turns lime water milky, However, when CO2 is passed in excess, the solution
becomes clear or the milkiness disappears. On heating the clear solution, milkiness reappears. This is explained by the following reactions:

Ca(OH)2 + CO2CaCO3 + H2O

CaCO3 + CO2 + H2O Ca(HCO3)2

Ca(HCO3)2(aq)CaCO3 + CO2 + H2O

Calcium

Carbonate

(Insoluble)

So, all the options (a), (b) (c) and(d) are True.

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