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. $X=Fe,Y=F{e}_2{O}_3$
• B. $X=Ag,Y=A{g}_2$
• C. $X=CuY=CuO$
• D. $X=AI,Y=A{I}_2{O}_3$

Answer 1

The correct option is A $X=Fe,Y=F{e}_2{O}_3$

An element $X$ exposure to $(H_{2}O+O_2)$ moist air,forms a reddish brown and a new compound y is formed.

$Fe+H_{2}O+O_2⟶F{e}_2{O}_3$

This $F{e}_2{O}_3$ is the reddish brown compound which is called rust.

So,$X\to Fe$

$Y\to F{e}_2{O}_3$