Discussion
Match the following :
| List I | List II |
|---|---|
| (a) Silica glass | (i) Chromium oxide |
| (b) Light sensitive eyeglass | (ii) Barium sulphate |
| (c) Decolorized glass | (iii) Molten quartz |
| (d) Colored glass | (iv) Silver halide |
Codes : (a) (b) (c) (d)
Answer: D
The correct matching is a-iii, b-iv, c-ii, d-i.
- Silica (fused quartz) glass is made from molten quartz (iii).
- Light-sensitive (photochromic) eyeglasses contain silver halide crystals that darken in ultraviolet light (iv).
- Decolorized glass is paired with barium sulphate (ii) in the key.
- Colored glass uses metal oxides such as chromium oxide, which gives green (i).
All four codes agree on (iii) for silica glass. Only the last code pairs photochromic glass with silver halide, which is the most distinctive pair, and it then gives chromium oxide to coloured glass, so it is the answer.
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