Compound eyes are more effective than vertebrate eye. Give reason

Interhalogen compounds are compounds formed by combination of different halogen atoms. Which are more reactive, halogens or interhalogen compounds? Give reason

The magnifying power of a telescope depends on the focal length of the objective and that of the eye- piece. Data of some lenses are given in the table. Choose any two lenses which are to be preferred as objective and eye-piece to construct a telescope. Give reason for your selection.

Why are powdered substances more effective adsorbents than their crystalline forms?

Why are powdered substabces more effective adsorbents than their crystalline froms?