Question

why does we call the solid carbon dioxide as dry oxide?​

Answer 1

Solid Carbon dioxide is called dry ice because it resembles ice, but carbon dioxide does not exist in liquid form, it sublimes straight from a solid to a gas. Hence "Dry Ice". It sublimes at –78°C becoming an extremely cold gas. It is often used in theatres or nightclubs to produce clouds, it looks a bit like smoke. Because it is denser than the air, it stays low.

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Answer 2

Explanation:

For the following question, two statements are given – one labelled Assertion (A) and the other labelled Reason (R). Select the correct answer to these questions from the codes (a), (b), (c) and (d) as given below:

(a) Both (A) and (R) are true and (R) is the correct explanation of the assertion (A).

(b) Both (A) and (R) are true, but (R) is not the correct explanation of the assertion (A).

(c) (A) is true but (R) is false.

(d) (A) is false but (R) is true.

Assertion: Viruses do not have a cell wall, cell membrane, nucleus and other cell organelles.

Reason: Viruses may sometimes kill the host cell.

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