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As the sodium bicarbonate is heated, grayish cloudy gas is formed. When gas was poured into the test-tube containing limewater, limewater turned cloudy. When the glowing splint was brought near the mouth of the test-tube, nothing happened, and the flame extinguished. When some of the residue was added with 1cm of water and shaken, residue dissolved it became colorless. When some residue was added with 1cm of diluted hydrochloric acid, bubble produced...