Zone refining is based on the principle that: (A) impurities of low boiling metals can be separated by distillation (B) impurities are more soluble in molten metal than in solid metal (C) different component of a mixture are differently adsorbed on an adsorbent (D) vapours of volatile compounds can be decomposed in pure metal

Wavelength of green light is

A) 400-450 nm

B) 500-550 nm

C) 660-720 nm

D) 720-800 nm

What is the difference between anaerobic & aerobic respiration? Name some organism that uses the aerobic mode of respiration?

What are the main components of our environment? Explain each of them briefly.

What are examples of hydrotropism plants?

Why is water liquid at room temperature?