Question

All the children on the class are making noice.correct the sentence

Answer 1

Correct sentence is: All the children in the class are making noise.

We use in to talk about where something is in relation to a larger area around it:

A: Where’s Jane?

B: She’s in the garden.In: phrasal verbs.We use in writing a number of verbs related to phrasal.

I was feeling very tired and I couldn’t really take in what she was saying (understand).

Please call in and visit our house  next time you’re in the area. 

Answer 2

Incorrect Sentence :
All the children on the class are making noice.

Correct Sentence :
All the children in the class are making noice .

There was the mistake of preposition there.
It was in "on" , we have to use "in" at this place now , because condition such demands.

Preposition : A Preposition may be defined as a word or group of words used before a noun or pronoun, gerund etc. to show its relation with another word in a sentence.

Eg : They came here at 5 p.m.

Here we used preposition of place and especially we did ,

In : In is generally used when the reference is not to any specific place or two the name of large cities countries etc.

On : On is used to indicate a particular area of land or place where something is.