Question

1. Very thin foils of
are used to decorate sweets.
2. Metals get tarnished when exposed to air due to the formation of an
3. The arrangement of metals in a series, in the decreasing order of their reactivity is called
4.
is formed on dissolving phosphorus pentoxide in water.
layer on its surface.​

Answer 1

Answer:

1 aluminum

....,........

Answer 2

Answer:

1.Silver foils are used for decorating sweets. It is because of its high malleability, silver metal can be hammered into thin silver sheets

2.

When exposed to air, the alkali metals tarnish quickly. This is because, they react with oxygen, moisture and carbon dioxide present in air to form oxides, hydroxides and carbonates.

3.reactivity series.

4.It reacts with water to form phosphoric acid H3PO4. It is highly exothermic and leads to formation of fumes. Diphosphorous Pentoxide is s very powerful dehydrating agent.

Explanation:

3. this arrangement is called reactivity series.