Question

The diagram below shows the heat of reaction between $N_2,O_2,NO,N{O}_2$
Which of the following statements pertaining to the formation of $NO$ and${NO}_2$ are correct?
1. The standard heat of formation of ${NO}_2$ is $68kJ{mol}^{-1}$.
2. ${NO}_2$ is formed faster than $NO$ at higher temperature.
3. The oxidation reaction of nitrogen to ${NO}_2$ is endothermic.
4. These two reactions often takes place in troposhere and causes green house effect.
5 These two reactions often takes place and are responsible for city smog.

• A. 1 and 2
• B. 1 and 3
• C. 1 and 4
• D. 3 and 4
• E. 3 and 5

Answer 1

Answer: (C)

1 and 4

$\text{The correct statements are:}$

$\text{1.The standard heat of formation of}$ $N{O}_2$$\text{is 68kJ/mol}$

$\text{4.These two reactions often takes place in troposhere and causes green house effect.}$