Pls answer only if you know, or I'll report your An unknown element X reacts in air to form its oxide Y. This Y dissolves in water which turns blue litmus into red.
Predict the nature of oxide ‘Y’ and tell whether ‘X’ is a metal or a non-metal? Name two elements that behave like ‘X’.

answer : a model is often used to explain and make things easier to understand when any scientific topic needs to be demonstrated and explained.

as in this case where a scientist wants to use a model to present the results of his detailed scientific investigation. he should do it as it will him to make the audience understand the concept in a much better way. also, it can be changed according to new scientific understandings.

the answers are

c and c