Arectangular solid measures 1.0m by 5.6cm by 2.1mm express its volume in cubic meters

Answer : The volume of of rectangle is,

Explanation : Given,

Length of rectangular solid = 1.0 m

Width of rectangular solid  = 5.6 cm = 0.056 m

conversion used : (1 cm = 0.01 m)

Height of rectangular solid = 2.1 mm = 0.0021 m

conversion used : (1 mm = 0.001 m)

Formula for volume of rectangle :

where,

V = volume of rectangular solid

l = length of rectangular solid

b = width of rectangular solid

h = height of rectangular solid

Now put all the given values in the above formula, we get:

Therefore, the volume of of rectangle is,

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.