Question

The question consists of two statements – one labelled Assertion (A) and the
other labelled Reason (R). Select the correct answer to this question from the options given below:
Assertion: Solid CO2(carbon dioxide) is called dry ice.
Reason: Molecules of a gas move randomly at high speed.

Answer 1

Explanation:

ANSWER

Answer(C)

Solid carbon dioxide (dry ice) sublimes everywhere along the line below the triple point (e.g., at the temperature of −78.5 °C (194.65 K, −104.2 °F) at atmospheric pressure), whereas its melting into liquid CO

2

can occur only along the line at pressures and temperatures above the triple point (i.e., 5.2 atm, −56.4 °C).

so statement 1 is correct and statement 2 is not correct.

Answer 2

Answer:

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