Which of the following factors are responsible for the change in state of solid carbon dioxide when kept exposed to air?
(i) increase in pressure
(ii) increase in temperature
(iii) decrease in pressure
(iv) decrease in temperature
(a) (i) and (ii) (b) (i) and (iii)
(c) (ii) and (iii) (d) (ii) and (iv)
Correct Answer: (c) (ii) and (iii)
Explanation: Increase in temperature and a decrease in pressure are the two factors responsible for the change of solid carbon dioxide into gas.
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