10 Traps That NEET Exploits in OC-11

Trap 1 — HDPE/LDPE condition reversal: HDPE = ZN catalyst + LOW pressure (linear). LDPE = free radical + HIGH pressure (1000–2000 atm) (branched). The options always reverse this — read every option before answering.

Trap 2 — Normal rain pH: Normal rain = pH 5.6 (CO2 → H2CO3). NEVER pH 7. Acid rain = pH BELOW 5.6. If you say "below 7," you are wrong.

Trap 3 — Nylon-6 vs 6,6 monomer count: "6,6" = two numbers = two monomers (HMD + adipic acid). "6" alone = one monomer (caprolactam). Examiners frequently reverse the count in options.

Trap 4 — Nylon = polyester: Nylon has AMIDE (–CO–NH–) linkages. DACRON has ESTER (–COO–) linkages. Both are condensation polymers but different linkage types.

Trap 5 — Cl• is consumed: Cl• is the CATALYST — regenerated at the end of each ozone destruction cycle. One Cl• destroys ~100,000 O3. It is NOT consumed.

Trap 6 — Minamata vs Itai-Itai: Mercury → Minamata (neurological). Cadmium → Itai-Itai (bone pain + kidney). Options always offer the reversed pair.

Trap 7 — BOD direction: Higher BOD = MORE polluted (more O2 consumed by bacteria). Students mistakenly think "high oxygen demand = more oxygen = cleaner water."

Trap 8 — Vulcanization makes rubber rigid: Vulcanized rubber is HARDER but still ELASTIC — NOT like Bakelite. S–S cross-links prevent permanent deformation but do not eliminate elasticity.

Trap 9 — Photochemical smog = SO2: SO2 is the London smog pollutant. Photochemical smog uses NOx + VOCs (primary) and produces O3 + PAN (secondary). Eye irritation = photochemical (PAN), not London (SO2).

Trap 10 — All condensation polymers are thermosetting: Nylon and Dacron are condensation polymers AND thermoplastics. Only cross-linked condensation polymers (Bakelite, melamine) are thermosetting.