High-Frequency NEET Topics (Based on PYQ Analysis)

Topic 1: Oxide types (HIGHEST frequency — nearly every year)

NEET Question format: "When Li, Na, and K are burned in excess $O_{2}$, the products formed are..."

Answer guide:

• Li → $Li_{2}O$ (normal oxide)
• Na → Na_{2}$$O_{2} (peroxide)
• K → K$O_{2}$ (superoxide)

Trap options: Li_{2}$$O_{2} for Li (wrong), $Na_{2}$O for Na (wrong), $K_{2}O$ for K (wrong)