Section A
Q1. Answer all of the following:
(a)
Match the following :
(i) Mg2SiO4
(ii) Be3Al2Si6O8 (Beryl)
(iii) Mq^{m^+} [Six-y P1-x Al1-y O4]
(iv) MgAl2O4
(v) Ca(OH)(PO4)_3 (A) Spinel
(B) Zeolite
(C) Orthosilicate
(D) Aluminophosphate
(E) Cyclosilicate
(F) Hydroxyapatite
(G) Intercalation Compound
(b)
Determine the ground state terms for the following compounds using L-S coupling scheme:
(i) [Cr(NH3)_6]^{3+} and (ii) [Mn(H2O)_6]^{3+}
(c)
How many stereoisomers are possible for the square-planar complexes
(i) Ma_2bc and (ii) Mabcd (a, b, c and d are unidentate ligands)? Draw the structures.
(d)
Calculate the concentration of carbonate ions in 0.10 M H2CO3 (aq).
(Given: K_{a1} = 4.3 imes 10^{-7}, K_{a2} = 4.6 imes 10^{-11})
(e)
A 25 mL solution containing Cl^- was treated with excess AgNO3 solution
to precipitate 0.830 g of AgCl. What was the molarity of Cl^- in the
unknown solution ? (At. wt. of Ag = 107.87, Cl = 35.453)
(f)
A sample of 0.6128 g of iron ore is dissolved in HCl and all the iron is
reduced to Fe^{2+} ions. This solution required 38.4 mL of 0.0198 M KMnO4
to titrate under acidic conditions. Calculate the mass percent of iron in
the ore. (Given atomic weight of iron = 55.85)
(g)
Explain the masking process and demasking process. How can the
concentration of nickel(II) be determined in the presence of Cu^{2+}?
(h)
Consider the 18-electron rule and determine the value of n for the
following compounds:
(i) K2Fe(CO)_n and (ii) MnCl(CO)_n
(i)
What is Carbon-14 dating ? Why is this method used to determine the
age of the ancient articles made of wood?
(j)
Arrange the following metal ions in the increasing order of their
oxidising power. Give reasons.
Sc^{3+}, Ti^{4+}, V^{5+}, Cr^{6+} and Mn^{7+}
