Match List - I with List - II:
List - I: (a) Be (b) Mg (c) Ca (d) Ra
List - II: (i) Treatment of cancer (ii) Extraction of metals (iii) Incendiary bombs and signals (iv) Windows of X-ray tubes (v) Bearings for motor engines.
Choose the most appropriate answer from the option given below:
List - I: (a) Be (b) Mg (c) Ca (d) Ra
List - II: (i) Treatment of cancer (ii) Extraction of metals (iii) Incendiary bombs and signals (iv) Windows of X-ray tubes (v) Bearings for motor engines.
Choose the most appropriate answer from the option given below:
- (A)(a)-(iii), (b)-(iv), (c)-(v), (d)-(ii)
- (B)(a)-(iv), (b)-(iii), (c)-(i), (d)-(ii)
- (C)(a)-(iii), (b)-(iv), (c)-(ii), (d)-(v)
- (D)(a)-(iv), (b)-(iii), (c)-(ii), (d)-(i)✓ Correct
Answer: (D)
Solution
Beryllium has so low an atomic number that it absorbs X-rays very weakly while still being strong enough to hold a vacuum, which is why it forms the windows of X-ray tubes. Magnesium burns with an intense white flame, which puts it into incendiary bombs and signal flares. Calcium is a strong reducing agent and is used to extract metals from their oxides and fluorides. Radium is radioactive and its radiation is applied in the treatment of cancer. The pairing is beryllium with windows of X-ray tubes, magnesium with incendiary bombs and signals, calcium with extraction of metals and radium with treatment of cancer.
JEE Main · 2021 · 18 Mar 2021 · Shift 2 · Single correct option