The order of reactivity of some metais are given. Answer the following questions by analysing it. Al gt Zn gt Cu gt Au a) Which metal is produced by the electrolysis of its molen salt? b) Matal occur in free state in nature. c) Metal produced by the self oxidation-reduction reaction. d) Metal are which is reduced by carbon.

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?