Question

Circle one best answer for each multiple. (4 pt. each) 1. The pH of 2.OM HCl is a) 2.0, b) 1.0, c) 0.0, d) <0.0. 2. Thymol blue appears red below pH 1.0, yellow between PH 2.5 - 8.0, and blue above pH 9.5. An aqueous solution turns green upon adding one drop of thymol blue. The pH of this solution is a) 0.5, b) 7, c) 9, d) 11. 3. The buffer HF/F can be prepared by mixing a) HF and NaF, b) HCl and NaF, c) HF and NaOH, d) all of the above. 4. The effective pH range of the KF/HF (K = 6.8x104) buffer is a) 2.2 - 4.2 b) 1.2-4.2, c) 2.2 -5.2, d) all possible. 5. Which cannot work as ligand for metal complexes? a) H30*, b) H20, c) OH', d) 02. 6. Number of geometric isomers of square planar Pt(NH3)2Cl2 complex is a) 0, b) 2, c) 3, d) 4. 7. An aqueous solution is 0.00500 M in Ca(OH)2. Give (OH), [H], pH, and poH. 15 nt)

Answer 1

০ G७S s ) CatoH), C० (oH), 2t Ca ০:০०১ r ০ : ०। () ০০০ to ०· ०| (W) tw^J«[० = - ५ (०४ to {০ t० ०x 1০५ ০০ 6 x\७ 2 M १स - ०4[+ +] -l ८to-] -1০৭ tot] -\c६ (०-०\ ) = 2

The pH 6 2.0 M HC i Concentrahon of H->[u*J -> 2 a M - o 3 which in len an AM (2) Can olve,not eou data qven a butter can be prepaned y ixin acid an with t Hence Naf % The etsecttve pu ane gennally aorh e ange Butten pka o3 C - 3 14 Hence 2 1 o 417 option Correet the 22-42 H30tant work pat an ithan donate The mumb sn of Qeometkric sonun C amd tram.

০ G७S s ) CatoH), C० (oH), 2t Ca ০:০०১ r ০ : ०। () ০০০ to ०· ०| (W) tw^J«[० = - ५ (०४ to {০ t० ०x 1০५ ০০ 6 x\७ 2 M १स - ०4[+ +] -l ८to-] -1০৭ tot] -\c६ (०-०\ ) = 2