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Q. The metal that occurs in the pure form in the earth's crust is
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Q. Which one of the following is a composite propellant?
Q. The two metal ions that cause hardness to water are:
Q. Brass gets discoloured in air because of the presence of which of the following gases in air?
Q. The acid rain destroys vegetations because it contains
Q. When a spoon is to be electroplated with nickel the spoon is
Q. Stainless steel is made up of
Q. Which of the following does not contain the material particles
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