When working with a Bunsen burner what precautions should be taken with respect to your clothing and hair?

Explanation:

Place the Bunsen burner away from any overhead shelving, equipment or light fixtures by at least 12 inches.

Tie-back any long hair, dangling jewelry, or loose clothing.

Your personal appearance before you even light the flame is a key safety consideration. Anything that is loose or dangling can potentially come into contact with the flame. Wear clothing that fits snugly to reduce the chances of the material catching fire. Participants with long hair should secure it away from the face so it doesn't fall down into the flame. Remove any long jewelry that might reach the flame. Wear goggles when using the flame, especially if you're heating a glass container or using chemicals.

answer: - 3.) the oxidation state of nitrogen in no changes from +2 to 0, and the oxidation state of carbon in co changes from +2 to +4 as the reaction proceeds.

solution: - as per the rules, oxidation number of oxygen in its compounds is -2. the sum of oxidation numbers of all the elements of a molecule or compound is zero.

also, the oxidation number in elemental form is zero.

in no, the oxidation number of o is -2 so the oxidation number of n is +2 so that the sum is zero.

similarly, the oxidation number of c in co is +2 and o is -2.

on product side the oxidation number of n is 0 as it is in the elemental form() .

oxidation number of c in carbon dioxide is +4 as there are two oxygen in it and we know that each oxygen is -2.

so, oxidation number of n is changing from +2 to 0 and the oxidation number of c is changing from +2 to +4.

since nitrogen is reduced and hence no is acting as an oxidizing agent. carbon is oxidized and so co is acting as a reducing agent.

so, the right choice is number 3.)the oxidation state of nitrogen in no changes from +2 to 0, and the oxidation state of carbon in co changes from +2 to +4 as the reaction proceeds.