Match List-I with List-II and select the correct answer using the code given below the lists: List-I (Substance added) A. Chromium (III) oxide B. Cobalt (II) oxide C. Cuprous oxide D. Manganese dioxide List-II (Colour imparted to glass) 1. Red 2. Violet 3. Green 4. Blue Codes: A B C D

The color imparted to glass depends on the specific transition metal oxide added. Chromium (III) oxide (Cr2O3) is used to produce vibrant green glass [t1][t4][t7]. Cobalt (II) oxide (CoO) is a powerful coloring agent that imparts a deep blue color even in small quantities [t1][t2][t7]. Cuprous oxide (Cu2O) is specifically known for producing red glass, whereas cupric oxide (CuO) typically yields blue-green shades [t4]. Manganese dioxide (MnO2) is often used as a decolorizer to remove iron impurities, but in higher concentrations, it imparts a violet or purple (amethyst) color to the glass [t1][t3][t4][t7]. Matching these properties: A-3 (Green), B-4 (Blue), C-1 (Red), and D-2 (Violet) corresponds to the sequence 3, 4, 1, 2.