Question

Complete the following :

$\mathrm{Metals}+\mathrm{Oxygen}\to \underset{\mathrm{\_\_\_\_\_\_\_}\mathrm{oxides}}{\underbrace{\mathrm{Metal}\mathrm{oxides}}}+{\mathrm{H}}_2\mathrm{O}\to \underset{\mathrm{Red}\mathrm{litmus}\mathrm{blue}}{\underbrace{\mathrm{\_\_\_\_\_\_\_}}}$

• A. Basic
• B. Bases

Answer 1

When a metal reacts with oxygen it gives basic metal oxides.

• Let us understand it with an example-
• When Magnesium reacts with Oxygen it gives Magnesium oxide, which is a basic oxide.

$\underset{\mathrm{Magnesium}}{2\mathrm{Mg}\left(\mathrm{s}\right)}+\underset{\mathrm{Oxygen}}{{\mathrm{O}}_2\left(\mathrm{g}\right)}\to \underset{\mathrm{Magnesium}\mathrm{oxide}}{2\mathrm{MgO}\left(\mathrm{s}\right)}$

When metal oxide reacts with water it produces a base.

$\underset{\mathrm{Magnesium}\mathrm{oxide}}{\mathrm{MgO}\left(\mathrm{s}\right)}+\underset{\mathrm{Water}}{{\mathrm{H}}_2\mathrm{O}\left(\mathrm{l}\right)}\to \underset{\mathrm{Magnesium}\mathrm{hydroxide}}{\mathrm{Mg}{\left(\mathrm{OH}\right)}_2\left(\mathrm{s}\right)}$

$\mathrm{Metals}+\mathrm{Oxygen}\to \underset{\mathbf{Basic}\mathrm{oxides}}{\underbrace{\mathrm{Metal}\mathrm{oxides}}}+{\mathrm{H}}_2\mathrm{O}\to \underset{\mathrm{Red}\mathrm{litmus}\mathrm{blue}}{\mathbf{Bases}}$

• The pH range of bases is from 8 to 14.
• Bases turn the color of red litmus paper to blue.

Hence, the two words to be filled will be basic and bases.