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Q. How many neutrons does iron have?
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Q. Which of the following substances is added to soap to make it antiseptic?
Q. Brass gets discolored in air because of the presence of which of the following gases in air?
Q. It is dangerous to have coal or charcoal burning in a closed room because
Q. what is the symbol of gold?
Q. Iron rusting, chemical or physical change
Q. What are the components responsible for acid rain?
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