Which gas is used in refrigeration plants ?
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Which halogen element is used in halogen light?
Differentiate between modern periodic table and mendeleevs table?
How do you express the total hardness of water?
Why is it more efficient for a labourer to raise bricks up to a brick layer by the use of a rope and pully than by carrying them up a ladder ?
Can a molecule be divided ?
Explain the Modes of valency ?
What is Acidity of a base ?
What is the composition of bronze ?
what is the valence of nitrogen?
How is arsenic produced?
Why is the percentage of oxygen today the same as it was thousands years ago, even though the whole world inhals it?
What are the names of the three different rays emitted by radioactive substances ?