C
Q. The percentage of Nitrogen in Air is
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Q. Hard water does not lather well with soap because
Q. Washing soda is the common name for
Q. Emission of β-particle from an atom
Q. How many moles are there in 140g of Si (atomic mass of silicon is 28)
Q. Cobalt - 60 is commonly used in radiation therapy because it emits
Q. Chocolates can be bad for health because of a high content of
Q. Iron is prevented from rusting by coating with zinc. This process is called as
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