2.33 ~g of compound X (empirical formula . CoH ₁₂ ~N ₄ Cl ₃ ) upon treatment with excess AgNO ₃ solution produces 1.435 ~g of a white precipitate. The primary and secondary valences of cobalt in compound X , respectively, are [Given : Atomic mass : Co =59, Cl =35.5, Ag =108 ]

Step-by-step solution

array l M.wt =59+12+14 4+35.5 3=233.5 C ₀ H ₁₂ ~N ₄ Cl ₃ AgNO ₃ 1.435 ~g AgCl 2.33 233.5 ~g =0.01 mole (0.01 ~mole ) array (i) 0.01 mole molecule produce 0.01 mole AgCl one replaceable Cl ^ ion so formula of complex is [ CO ( NH ₃ )₄ Cl ₂ ] Cl (ii) Oxidation no. of Co is +3 so primary valency is 3 . (iii) Coordination no. is 6 so sec. valency is 6 so ans. is 3,6