Question

An element X on exposure to moist air turns reddish-brown and a new compound Y is formed. The substance X and Y are
(a) X = Fe, Y = Fe2O3
(b) X = Ag, Y = Ag2S
(c) X = Cu, Y = CuO
(d) X = Al, Y = Al2O3

Answer 1

Answer:

(a) X=Fe, Y=Fe2O3

Explanation:

Fe that is iron if exposed to moist air react with atmospheric oxygen and rust is form

Answer 2

Answer:

The correct answer to your question is Option a). Fe2O3 (ferric Oxide). This is reddish Brown in color.

Explanation:

This is an easy question…Here let us simply understand that oxidation reaction takes place.  

Now looking at all four options that you have provided the First one is Fe2O3. This is a compound that is chemically named as Ferric Oxide. It is  also called as Iron (3) oxide. The moment Iron is exposed to Moist air, it forms Ferric Oxide. In simple terms, Ferric Oxide is also another name for Rust.

The reaction is a simple oxidation reaction and is seen in most cases as Rusting of iron. If you look closely, Rust is a chemical change in which the rust is Reddish Brown in Color

So I don’t think that we need to look further at all other options.  

The correct answer to your question is Option a). Fe2O3 (ferric Oxide). This is reddish Brown in color.