Question

how can we say that metallic oxide
are baic in nature​

Answer 1

Answer:

Metallic oxides are basic in nature because they react with dilute acids to form salt and water. They also react with water to form metal hydroxides which are alkaline in nature because these metal hydroxides release OH- ions in solution. ... Therefore, non metallic oxides would be acidic in nature.

Explanation:

hope it will help u

Answer 2

✒ How basic?

Nearly all metals react with oxygen to form metal oxides/Metallic oxides. They are basic in nature because on dilution of these oxides in water, we get alkalis or Metal hydroxide. They release OH‐ when dissolved in water. Metal oxides that are soluble in water dissolve in it to form metal hydroxide.

$\sf \: Na_2O + H_2O \: \longrightarrow \: 2NaOH$

These oxides and hydroxide also reacts with dilute acid and results in respective Salt and water. Which clearly explains their basic nature because salt is formed when acid reacts with base (Neutralisation). For Example:

$\sf \: CuO +H_2SO_4 \longrightarrow Cu_SO_4 +H_2O$

Generally, most of the metallic oxides are basic in nature, but some are also amphoteric. That means, they react with both base and acid. These oxides are of Aluminium and Zinc

$\sf \: Al_2O_3 + 6HCl \longrightarrow 2AlCl_3 +3H_2O$

$\sf \: Al_2O_3 + 2NaOH \longrightarrow 2NaAlO_2 +H_2O$

✒ Practically...

The basic nature can also be checked in laboratory by using Indicators. Litmus paper is generally available in laboratories. These oxides will change red litmus to blue. We can also check using pH scale, an their pH will be between 8 to 14, which again indicates its basic nature.

⚠️ Similarly, Non metals reacts with oxygen or water to form non-metal oxides or non-metal hydroxides. They are acidic in nature and release H+ when dissolved in water. It changes blue litmus to red.

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