The upper part of the heterosphere is composed almost completely of which gas?
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Atoms of same element having different mass numbers are called__________
The Chemical formula of Ammonium sulphate is
In a compound the elements are always present in definite proportions by ______
______ is used for making chemical apparatus like beakers, flasks etc.
Which of the following is also used as a Bio fertilizer?
Which base is present in lime water?
Which of the following inert gases is placed in period 4 of the periodic table?
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