Electrolysis is a process in which: MCQ with Answer and Explanation

Explanation:
Pure water is a poor conductor of electricity. The presence of dissolved ionic impurities (salts) increases conductivity. Measuring specific conductance (or resistivity) is a quick method to check water purity; ultrapure water has conductivity ~0.055 µS/cm. Boiling point elevation also indicates impurities but is less sensitive for trace amounts. Conductivity meters are widely used in laboratories.

Explanation:
The enhanced greenhouse effect causing global warming is mainly due to rising CO₂ levels from fossil fuel combustion, deforestation, and industrial processes. Other GHGs like CH₄, N₂O, CFCs also contribute. Oxygen and nitrogen are not greenhouse gases. Argon is noble gas, inert. The atmospheric CO₂ has increased from ~280 ppm (pre-industrial) to over 420 ppm. This leads to climate change, sea level rise, and extreme weather.

Explanation:
Vinegar is a 4-8% solution of acetic acid (CH₃COOH) in water. Formic acid is in ant sting, citric in citrus fruits, lactic in curd. Acetic acid is used as preservative and condiment.