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Q. The atoms of the elements which have same number of neutrons are called
Q. Chile saltpeter is the common name of:
Q. Potassium nitrate is used in
Q. The items amenable to detection by soft X-rays are
Q. The main chemical substance present in the bone and teeth of animal is
Q. Which of the following is the heaviest metal among the following -
Q. Brass gets discoloured in air due to constant exposure in presence of:
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