JEE Main202124 Feb 2021Evening ShiftChemistrys Block ElementsActual
Match List - I with List - II. List-I (Salt) List-II (Flame colour wavelength) (a) LiCl (i) 455 . 5 nm (b) NaCl (ii) 670 . 8 nm (c) RbCl (iii) 780 . 0 nm (d) CsCl (iv) 589 . 2 nm Choose the correct answer from the options given below:
Options
- A(a)-(iv), (b)-(ii), (c)-(iii), (d)-(i)
- B(a)-(i), (b)-(iv), (c)-(ii), (d)-(iii)
- C(a)-(ii), (b)-(i), (c)-(iv), (d)-(iii)
- D(a)-(ii), (b)-(iv), (c)-(iii), (d)-(i)
Correct answer
D. (a)-(ii), (b)-(iv), (c)-(iii), (d)-(i)
Step-by-step solution
Colour   λ / nm Li Crimson   red   670 . 8 Na Yellow   589 . 2 Rb Red   violet   780 . 0 Cs Blue   455 . 5 Range of visible region: 390 nm – 760 nm VIBGYOR Violet – Red LiCl Crimson Red NaCl Golden yellow RbCl Violet CsCl Blue So, LiCl which is crimson have wavelengths close to red in the spectrum of visible region which is as per given data.