The metal M is: (a) Sodium (b) Copper (c) Iron (d) Steel Sol : www.cbse.site/sc/cm120 146. The solution S is: (a) NaCl (b) NaOH (c) CaCl2 (d) CaOH Sol : www.cbse.site/sc/cm120 147. Here the gas G is: (a) Hydrogen (b) Oxygen (c) Carbon-dioxide (d) Nitrogen
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