Most modern catalytic converters in automobiles have a surface with a platinum-rhodium catalyst. For which of the following reactions is this catalyst used? a. the conversion of nitric oxide into elemental nitrogen and oxygen gas
b. the conversion of carbon dioxide into bicarbonate
c. the conversion of carbon monoxide into carbon dioxide
d. the conversion of octane into carbon dioxide and water vapor

a. the conversion of nitric oxide into elemental nitrogen and oxygen gas.

Explanation:

Hello,

In this case, combustion at the automobiles' motors is not complete since gasoline usually has a considerable nitrogen oxides content (NOx) which is highly toxic when giving off from the cars. For that reason, recent advancements have shown platinum-rhodium-based catalytic converters have the capacity to catalyze the conversion of nitrogen oxides to elemental nitrogen and oxygen which are nontoxic. For that reason, answer is a. the conversion of nitric oxide into elemental nitrogen and oxygen gas.

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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.