s-Block Elements

Match List I with List II. Choose the correct answer from the options given below :

1. (A)-(II), (B)-(IV), (C)-(III), (D)-(I)
2. (A)-(III), (B)-(I), (C)-(IV), (D)-(II)
3. (A)-(I), (B)-(IV), (C)-(III), (D)-(II)
4. (A)-(IV), (B)-(II), (C)-(I), (D)-(III)

Answer

(2) (A)-(III), (B)-(I), (C)-(IV), (D)-(II)

Solution

flame colour fixes the wavelength: red ≈ 650–780 nm, yellow ≈ 590 nm, blue ≈ 450 nm

(A): Li — crimson red, 670.8 nm ⇒ (A) is (III)

(B): Na — yellow, 589.2 nm ⇒ (B) is (I)

(C): Rb — red-violet, 780.0 nm ⇒ (C) is (IV)

(D): Cs — blue, 455.5 nm ⇒ (D) is (II)

∴ (A)-(III), (B)-(I), (C)-(IV), (D)-(II)

Answer: (2)