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Milk tastes sour when kept in the open for sometimes due to the formation of-
The gas used for filling weather balloons is-
The absolute value of the charge on electron was determined by-
The nucleus of an atom consists of-
The most reactive among the halogens is-
The chemical name of'Common salt’
A polymeric substance used to make parachute is
The element used for making solar cells is
The element used in the manufacture of safety matches is —
Bronze is an alloy of-
