Flame colors of sodium and sulfur in oxygen

Steps:

• Identify sodium's flame color: sodium combustion emits yellow light from excited sodium atoms.
• Identify sulfur's flame color: sulfur burning in oxygen forms SO2, producing a blue flame.
• Match to options: first color for sodium (yellow), second for sulfur (blue).
• Select row with yellow then blue: option C.

Why C is correct:

• Sodium's yellow flame results from emission spectrum of Na atoms at 589 nm; sulfur's blue from SO2 molecular emission.

Why the others are wrong:

• A: Sodium is yellow, not white.
• B: Sulfur is blue, not yellow.
• D: Sulfur is blue, not yellow.

Final answer: C