The upper part of the heterosphere is composed almost completely of which gas?
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Which is the only non-metal placed at the left side of the Modern Periodic Table?
______ decreases the rate of setting of cement.
Which of the following is not soluble in water?
Which of the following is a Synthetic rubber?
________ is made by mixing iron with carbon and metals like chromium, nickel and manganese.
Who was the first man to go to space?
Which of the following elements has the lowest melting point?
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