Which of the following is NOT a radioactive element?
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Two or more elements combine to form a
There are 15 protons and 22 neutrons in the nucleus of an element. What is its mass number?
The pH of a solution, whose hydrogen ion concentration is 1 x 10 mole per litre, will be ____.
If the first and third members of a Dobereiner triad are Phosphorous and Antimony, the second member of this triad is
Which of the following gases turns lime water milky?
What is the name of the process where gas is directly converted to solids called?
Which of the following is used in the preparation of tincture iodine, cough syrup and many tonics?
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