Why is it dangerous to have a coal fire burning with doors and windows closed ?2 6017
Why does a diamond cut glass?2 5889
Why is the sea water saline ?9 16831
Why it is advised to boil water before drinking ?1 4626
Why is the percentage of oxygen today the same as it was thousands years ago, even though the whole world inhals it?1 4341
Why would we all suffocate, if all the green plants were killed ?1 3675
Why are substances like caustic soda and calcium chloride called hygroscopic substances ?2 5176
Why is sodium preserved in kerosene oil ?3 15265
Why is a newly made quit warmer than an old one ?1 3674
What causes smoke to curl up into the air ?1 4772
Why does a dog hang out his tongue, when it is hot ?2 5130
Why dies thermos flask keep a hot liquid hot and a cold liquid cold ?1 3962
Why does oil thrown on rough sea make it calmer ?1 3679
Why is heat more oppressive on a damp hot day ?1 3315
Why is dew formed more readily on clear nights than on cloudy ones ?1 4274
How do you express the total hardness of water?
Explain substituted hydrocarbon?
Why is acetone used for cleaning viscometer?
Why is starch indicator added towards the end point?
Why is sulphuric acid added during the preparation of standard fas solution?
State lambert’s law.
Why is eriochrome black t indicator cannot be used in this experiment?
What are filters? Why are they used?
What is the reaction that occurring between fas and potassium dichromate?
Why be is not soluble in liquid ammonia?
Explain the term aliquot and diluent?
What is weak acid?
What makes a molecule into organic molecule?
What are the factors that affect the viscosity of a liquid?
However ozone is heavier than oxygen still ozone is up there in sky why?