Question

The melting point of carbon dioxide gas is _____.

• A. $28.4{}^{0}C$
• B. $48.6{}^{0}C$
• C. $-56.6{}^{0}C$
• D. $0{}^{0}C$

Answer 1

The correct option is C $-56.6{}^{0}C$

The melting point of a substance refers to the temperature at which it converts from solid state to liquid state at 1 atm pressure.
In the case of carbon dioxide gas $\left(C{O}_2\right)$ at 1 atm pressure, it gets converted from solid $C{O}_2$ to liquefied $C{O}_2$ at $-56.6{}^{0}C$.