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5th ऑप्शन में सुरक्षा शब्द का अनुवाद नहीं किया गया है इसलिए यह विकल्प गलत है।
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