What is the chemical formula of Ozone?
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Which of the following is NOT a radioactive element?
The pH of a solution, whose hydrogen ion concentration is 1 x 10 mole per litre, will be ____.
CuO + H2 ---> Cu + H2O. This equation is an example of
Two or more elements combine to form a
If the first and third members of a Dobereiner triad are Phosphorous and Antimony, the second member of this triad is
What is the name of the process where gas is directly converted to solids called?
There are 15 protons and 22 neutrons in the nucleus of an element. What is its mass number?
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