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Q. Higher concentration of nitrogen dioxide in atmosphere air causes
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Q. An example of a cross-linked polymer is
Q. The atoms of the elements which have same number of neutrons are called
Q. The element common to all acids is
Q. What is the increase in the proportion of oxygen in a chemical reaction called?
Q. The number of neutrons present in an element having mass number 226 & atomic number 88 is:
Q. Which of the given is found in chlorophyll -
Q. Aluminium is extracted from bauxite
Q. The process of removing calcium and magnesium from hard water is known as
Q. The metal which reacts most violently with with cold water is
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