Why would an electrician use parallel circuits to wire the lights in each room of a house instead of using a series circuit?

a.
electrons continue to flow in a parallel circuit even if part of the circuit is broken. in a series circuit, a break such as a burned out lightbulb would cause the current to stop in the whole room.

b.
when electricians get their license, they are only licensed to install parallel circuits. most electricians aren't certified to install series circuits.

c.
parallel circuits prevent electrons from flowing if part of the circuit is broken and therefore prevent fires. series circuits cause more fires because electrons still flow.

d.
parallel circuits are much easier to wire and are required by the electrical code for housing construction in most communities. series circuits are sometimes used with special approval.

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.