Which of the following is NOT a primary green house gas in the earth's atmosphere?
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The oceanic crust mainly consists of silica and __________.
........... is not a sub atomic particle of an atom.
Which of the following bonds are weakest in nature?
What is the number of atoms in 46 g of sodium-23 (N = Avogadro constant)?
The residual attractive or repulsive forces between molecules or atomic groups that do not arise from a covalent bond, or ionic bonds is called _____
An element A forms an oxide with formula A3O4. What is the valency of element A?
Which of the following is an example of thermosetting plastic?
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