KVPY SX SB Exam 2016 Question Paper

M.wt = 59 +12 + 14 × 4 + 35.5 × 3 = 233.5
CoH12N4Cl3

AgNO3

→

1.435g‌AgCl

2.33

233.5

g=0.01‌mole (0.01 mole)
(i) 0.01 mole molecule produce 0.01 mole AgCl
∴ one replaceable Cl− ion
so formula of complex is [CO(NH3)4Cl2]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