Question

A solution of a substance ‘X’ is used for whitewashing.

(i) Name the substance ‘X’ and write its formula.

(ii) Write the reaction of the substance ‘X’ named in (i) above with water.

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Answer 1

Answer:

(1) The solution of the substance used for whitewashing is calcium oxide also called quicklime with chemical formula CaO.

Quicklime is used for whitewashing as it produces calcium hydroxide (CaOH) when it reacts with water (H2O) and absorbs carbon dioxide (CO2) from the environment, as a result, it produces calcium carbonate (CaCO3) which creates a hard coating on the walls.

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Answer 2

Answer:

RNA viruses mutate faster than other DNA viruses because the enzyme RNA dependent RNA polymerase that synthesizes RNA does not have the activity of proof reading while DNA polymerase has this activity. Because of this absence of proof reading, wrong bases are inserted without correction and hence mutation is faster.

Explanation:

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