Answer: platinum and rhodium.
- A platinum and rhodium
- B iron and copper
- C zinc and lead
- D sodium and calcium
Correct answer: A. platinum and rhodium
Explanation: Catalytic converters use platinum, palladium and rhodium as catalysts to convert unburnt hydrocarbons, carbon monoxide and nitrogen oxides into less harmful gases.
Sunlight passes through the atmosphere and warms the surface; the surface re-radiates this energy as infrared heat, which greenhouse gases (CO₂, CH₄, water vapour) absorb and trap - a naturally beneficial process that intensifies into global warming as gas concentrations rise from human activity.
Concept context
Pollution, global warming, ozone depletion, deforestation, and sustainability. Important for NEET and general awareness.