Answer: The given statement is true.
Explanation:
According to the Dalton's law, total pressure of a mixture of gases that do not react with each other is equal to the partial pressure exerted by each gas.
The relationship is as follows.

or, 
where,
....... = partial pressure of individual gases present in the mixture
Also, relation between partial pressure and mole fraction is as follows.

where,
= mole fraction
Thus, we can conclude that the statement Dalton's law of partial pressures states that the total pressure exerted by a mixture of gases is the sum of the pressures exerted independently by each gas in the mixture, is true.
Because of the protons connected to the Nitrogen oxide group giving it its positive charge.
1.) Gas given off
2.) precipitate formed
3.) large amount of heat given off
4.) Color change
your answer is A if i am wrong let me know
They both break down and and erode