What is most likely to have caused the increase in atmospheric nitrogen oxide (NO) between 4 A. M. and 7 A. M.?

B. exhaust from vehicles during morning rush hour

Explanation:

Considering the available options:

A. generation of electricity in coal-fired plants

B. exhaust from vehicles during morning rush hour

C. emissions of heavy metals from smelting plants

D. reactions driven by sunlight

During morning rush hour, more vehicles are on the road and one of the components of automobile exhaust fumes is oxides of nitrogen. Hence, more vehicles on the road means more oxides of nitrogen in the atmosphere within that particular period.

The most probable option is B.

the best answer is d because the strong cohesion is caused by the ability of water molecules to undergo hydrogen bonding.

a is incorrect because when water solidifies, it becomes   ice, which expands and occupies a bigger volume for the same mass of water in its liquid state.

b is incorrect because water has high surface tension. besides bonding to itself it hydrogen bonds to other molecules at the top decreasing possibility for breaking of attractive forces.

c is incorrect because the water molecule has oxygen which is highly electronegative and so pulls the electron pair towards itself creating a dipole moment, making the molecule polar.

e is incorrect because water has strong adhesion, ability to stick to other molecules such as glass because of this molecules having stronger hydrogen bonding than water.

explanation:

0.07 g/cm³

1.37 g/cm³