pBlock ElementsII 1 Question 42
42. Which of the following is incorrect statement?
$(1978,1 \mathrm{M})$
(a) $\mathrm{NO}$ is heavier than $\mathrm{O} _{2}$
(b) The formula of heavy water is $\mathrm{D} _{2} \mathrm{O}$
(c) $\mathrm{N} _{2}$ diffuses faster than oxygen through an orifice
(d) $\mathrm{NH} _{3}$ can be used as a refrigerant
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Answer:
Correct Answer: 42. (a)
Solution:
- NO is lighter than $\mathrm{O} _{2}$.
$\mathrm{D} _{2} \mathrm{O}$ is commonly known as heavy water.
$\mathrm{N} _{2}$ is lighter than $\mathrm{O} _{2}$, effuse at faster rate under identical experimental conditions. $\mathrm{NH} _{3}$ liquefies at very low temperature. Therefore, liquid $\mathrm{NH} _{3}$ is used as a refrigerant.
