Indian Institute of Technology Mumbai (IIT-M) 2006 Entrance Exams IIT Entrance Exams IIT Chemistry - Question Paper

Mole wt of X is (assume mol. Wt of Y is 187).



(1) 52 (2) 84



(3) 126 (4) 41.36



27 A mixture of Feo and Fe3O4 when heated in air to

Constant weigh gains 5% in its weight. The % of

Feo in the sample is



(1) 79.75 (2) 20.25



(3) 30.25 (4) none of these



28 A sample of pure calcium weighing 1.35 g was

Quantitatively converted to 1.88 g of pure CaO.

Atomic mass of calcium is



(1) 20 (2) 40



(3) 60 (4) none of these



29 FeS----->Fe3++So3

Eq wt of FeS for this change is(mol.wt.of FeS = M)

(1) M/1 (2) M/5



(3) M/7 (4) M/9



30 The reaction

Cl2 + S2O32- + OH------> So42- + Cl- + H2O
Staring with 0.15 mole Cl2, 0.010 mole S2O32-

0.30 mole OH-, Mole of Cl2 left in solution



(1) 0.11 (2) 0.01



(3) 0.04 (4) 0.09



31 A sample of FeSO4 and FeC2O4 dissolved in

H2SO4. the complete oxidation of sample needed

8./3 eq of KMnO4 After oxdation the reaction mixture

Was decreased by Zn On again 0Xidation by

KMmO4Required 5/3eq the mole ratio of FeSO4 and

FeC2O4



(1) 3/7 (2) 7/3



(3) 5/7 (4) 7/5





32 A sample of NaHCO3 + Na2CO3 needed 20 ml of

HCl using phenolphthalein as an indicator and 35 ml

More needed if methyl orange is used as indicator.

Earning:   Approval pending.