The atomic number of Fe is 26. When Fe reacts with oxygen, ions with +3 oxidations states are formed. (Valency : Oxygen =2 ) a) Write the chemical formula of this compound. b) Write down the subshell electronic fonfiguration of Fe^3+.

What type of questions asked from the lesson of magnetic effect of electric current 

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?