MCQ Detailed View

The green flame seen in fireworks is produced due to the presence of barium compounds. In inorganic chemistry, the phenomenon is explained by the flame test, which shows that certain metal ions emit characteristic colors when heated strongly. This happens because the heat excites electrons to higher energy levels, and when these electrons return to their original state, they release energy in the form of visible light of specific wavelengths.

Barium (Ba) and its salts, such as barium nitrate (Ba(NO₃)₂) and barium chloride (BaCl₂), are commonly used in pyrotechnics to generate a bright green color. This green coloration is very distinct and is one of the standard colors in firework displays. Barium compounds not only provide color but may also serve as oxidizers in pyrotechnic mixtures, helping the fireworks burn more efficiently.

The other options listed do not produce green flames. Sodium produces a strong yellow flame, which is very intense and often masks other colors. Potassium burns with a pale violet or lilac flame. Mercury does not contribute a distinctive flame color in common flame tests and is not used in fireworks because of its toxicity.

The flame test is a widely used method in inorganic chemistry to detect the presence of certain metal ions. Each element produces a characteristic flame color, making it a simple and reliable tool for qualitative analysis. In fireworks, this same principle is applied to produce beautiful color effects. Along with barium for green, strontium gives red, copper gives blue, and sodium gives yellow.

Thus, the green flame in fireworks is due to barium and its compounds, which are key ingredients in the pyrotechnic industry.