According to Newlands' law of Octaves, how many elements exist in nature?
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Atomic mass of Sulphur is 32 u. The number of moles in 16 grams of Sulphur is:
Acid rain is caused by release of ___ and___ into the air.
The hardest natural substance is
In human body, vertebrae are part of ___.
Which of the following statements is Incorrect?
What product is formed when electricity is passed through an aqueous solution of sodium chloride?
___ is known as a disease mostly caused by occupational health hazards.