______ bond holds the atoms together within a water molecule.
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Name the noble gas which is placed in the third period and eighth group of the Modern Periodic table.
Which of the following is a commercial source of energy?
Who invented the modern periodic table?
___________ gases absorb long wave (infrared) radiation from the earth and emit it again towards the earth.
Find the odd one out.
Which one of the following nonmetals shows allotropy in the liquid state?
Which of the following has pH value 7?
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