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The correct answer is B
The noble gas used in radiotherapy is
The element used for making solar cells is
Formation of ozone hole is maximum over
The gas used for filling weather balloons is-
The element used in the manufacture of safety matches is —
The major constituent of air is
Which of the following is a physical change?
The gas used for filling weather balloons is-
______is the process in which acids and bases react to form salts and water
The noble gas used in radiotherapy is