Match each species in Column I with the d-electron count of its metal in Column II. Column I: P [Fe(CN)6]^4-; Q [Cr(NH3)6]^3+; R [Cu(NH3)4]^2+; S [Ag(NH3)2]^+. Column II: 1 d^3; 2 d^6; 3 d^9; 4 d^10.

JEE Advanced levelSingle correct optionDifficulty 3 of 3cc085

Match each species in Column I with the d-electron count of its metal in Column II. Column I: P $[Fe (CN) X_{6}] X^{4 -}$ ; Q $[Cr (NH X_{3}) X_{6}] X^{3 +}$ ; R $[Cu (NH X_{3}) X_{4}] X^{2 +}$ ; S $[Ag (NH X_{3}) X_{2}] X^{+}$ . Column II: 1 $d^{3}$ ; 2 $d^{6}$ ; 3 $d^{9}$ ; 4 $d^{10}$ .

Fe:

x - 6 = - 4

gives Fe(II),

3 d^{6}

. Cr is +3,

3 d^{3}

. Cu is +2,

3 d^{9}

. Ag is +1,

4 d^{10}

. So P-2, Q-1, R-3, S-4.