Question

The element whose oxide will turn red litmus solution to blue litmus solution is​

Answer 1

Explanation:

Before arriving to the answer, we must be knowing how to find the answer by the hints provided in the question.

• It is a type of element.
• Reacting with oxygen to form it's oxide.
• Turning red litmus to blue.

Litmus is a natural indicator available in red and blue colour for indicating the presence of acids and bases. It turns blue litmus to red [acid] and red litmus to blue [base]. From here we knew that,

• The oxide is basic in nature.

In the periodic table, the elements that form basic oxides are the metals. Generally, metallic oxide are basic in nature but sometimes amphoteric oxide can also form for metals like Aluminium, Zinc etc.

Here are some of the reactions:

• $\large{ \sf{4Na + O_2 \longrightarrow 2Na_2O(basic)}}$
• $\large{ \sf{4K + O_2 \longrightarrow 2K_2O(basic)}}$
• $\large{ \sf{2Mg + O_2 \longrightarrow 2MgO(basic)}}$
• $\large{ \sf{4Al + 3O_2 \longrightarrow 2Al_2O_3(amph.)}}$

So The correct answer to the Q. is:

$\LARGE{ \boxed{ \red{ \bf{Metals}}}}$

And we are done !!