Question

The boiling point of a liquid $X$ is ${120}^0$ c more than that of water. Boiling point of $x$ is

• A. $353k$
• B. $373k$
• C. $393k$
• D. $120k$

Answer 1

Answer: (C)

$393k$

Boiling point is the temperature at which vapor pressure equals to atmospheric pressure. In simple words, it is the temperature at which a liquid boil and changes to vapor. Water boils at ${100}^{0}C$. So it's boiling point is ${100}^{0}c$.

The boiling point of liquid $X$ is ${20}^{0}c$ more than that of water. So, the boiling point of liquid $X=100+20={120}^{0}c$

To convert ${}^{0}C$ to kelvin, we add $273$.

So, boiling point of liquid $X=120+273=393K$

Hence, choice (3) is correct.