The impurity silica from iron ore is removed by adding: MCQ with Answer and Explanation

Explanation:
Radioactive decay emits alpha, beta, and gamma rays. Alpha particles are heavy and positively charged, stopped by paper. Beta particles are lighter, stopped by aluminum. Gamma rays are high-energy electromagnetic photons with no mass or charge, giving them the highest penetrating power; they require thick lead or concrete to be significantly attenuated.

Explanation:
Liquefied Petroleum Gas (LPG) primarily consists of butane (C₄H₁₀) and isobutane, with some propane. For domestic use, it is often a mix of butane and propane. Methane is the main component of CNG and natural gas, which require different storage pressures and infrastructure.

Explanation:
Methanol (wood alcohol) is highly toxic. When ingested, it is metabolized by the enzyme alcohol dehydrogenase into formaldehyde and then formic acid. Formic acid interferes with mitochondrial function, leading to metabolic acidosis, optic nerve damage, and blindness. Both statements are correct and R explains A.