Differentiate between modern periodic table and mendeleevs table?
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what is the indicator used?
What is chemical oxygen demand?
What is polar hcl?
Why does a freely supended magnetic needle always point North and South ?
Explain the classification of oxides ?
Explain the process of spontaneous combustion?
Why is ammonium hydroxide added to the brass solution?
While standing on railway platform and heating the whistle of an engine coming towards us , we hear the sound increasing; bit when the engine is receding from us it appears to fall why ?
What is electroplating ?
Acid value defination is numbber milligrams of KOH required to nuetralise the acid present in one gram oil & fats but why not use NaOH for nuetralisation?
What is the role of silver sulphate?
What causes smoke to curl up into the air ?