Question

23. ___________ burns in oxygen with a brilliant golden yellow flame.

• A. $\mathrm{Na}$
• B. $\mathrm{Ca}$
• C. $\mathrm{Mg}$
• D. $\mathrm{K}$

Answer 1

The correct option is A

$\mathrm{Na}$

Explanation:

• Metals react with oxygen to form metallic oxides.
• Sodium $\left(\mathrm{Na}\right)$ reacts vigorously with Oxygen $\left({\mathrm{O}}_2\right)$ to form Sodium oxide$\left({\mathrm{Na}}_2\mathrm{O}\right)$.
• The reaction involved is:

$4\mathrm{Na}+{\mathrm{O}}_2\to 2{\mathrm{Na}}_2\mathrm{O}$

• Sodium burns in Oxygen with a brilliant golden-yellow flame.

Hence, option (A) is the correct answer.