Why is it dangerous to have a coal fire burning with doors and windows closed ?2 4951
Why does a diamond cut glass?2 4912
Why is the sea water saline ?9 14372
Why it is advised to boil water before drinking ?1 3846
Why is the percentage of oxygen today the same as it was thousands years ago, even though the whole world inhals it?1 3539
Why would we all suffocate, if all the green plants were killed ?1 2990
Why are substances like caustic soda and calcium chloride called hygroscopic substances ?2 4268
Why is sodium preserved in kerosene oil ?3 13820
Why is a newly made quit warmer than an old one ?1 3003
What causes smoke to curl up into the air ?1 3980
Why does a dog hang out his tongue, when it is hot ?2 4139
Why dies thermos flask keep a hot liquid hot and a cold liquid cold ?1 3311
Why does oil thrown on rough sea make it calmer ?1 2891
Why is heat more oppressive on a damp hot day ?1 2604
Why is dew formed more readily on clear nights than on cloudy ones ?1 3529
which gas is used in preaparation of bit salt
What is mineral water?
What is the composition of ferroin?
What is modern definition(iupac) of ph?
What happens when the excess of stannous chloride is not removed
What is the chemical formula of alum?
What is the metal used to extract copper from the solution of copper sulphate?
Why is acetic acid added?
What is the resulting solution when benzene and toluene are mixed ?
What is photoelectric colorimeter?
How are pka and strength of a weak acid related?
What is weak acid?
How is the viscosity of liquid related to its mobility?
State beer-lambert’s law.
What is colorimetry?