Question

A metal 'P' when exposed to the moist air for longer period of time, loses its shiny
brown surface and gains a green coat. Why this happened ? Identify the metal.
Write the name and chemical formula of this green coloured compound. List any
two ways to prevent this process.​

Answer 1

Answer:

given in explanation

Explanation:

The metal "p" is

$\blue{copper}$

copper when exposed to the moist air for longer period of time loses its shiny brown surface and gains a green coating

this is because

the moisture and commonly oxygen which is a highly reactive gas attached to the surface of the metal which corrode the metal and this process known as corrosion .

The chemical reaction is

$\</strong><strong>b</strong><strong>l</strong><strong>u</strong><strong>e</strong><strong>{</strong><strong>Cu</strong><strong>(</strong><strong>s</strong><strong>)</strong><strong>+</strong><strong>O2</strong><strong>(</strong><strong>g</strong><strong>)</strong><strong>-</strong><strong>-</strong><strong>-</strong><strong>-</strong><strong>-</strong><strong>></strong><strong>CuO2</strong><strong>}[/</strong><strong>tex</strong><strong>]</strong></p><p></p><p><strong>The</strong><strong> </strong><strong>green</strong><strong> </strong><strong>coloured</strong><strong> </strong><strong>compound</strong></p><p><strong>formed</strong><strong> </strong><strong>on</strong><strong> </strong><strong>the</strong><strong> </strong><strong>surface</strong><strong> </strong><strong>of</strong><strong> </strong><strong>the</strong><strong> </strong><strong>metal</strong><strong> </strong><strong>is</strong></p><p></p><p>[tex]\green{Copper..oxide}$

The two ways to prevent this process are

1. paint the iron article
2. galvanization method-apply a coating of zinc which stops the contact of moisture by becoming a barrier between the metal and moisture