1
IIT-JEE 1980
Subjective
+4
-0
(i). A sample of MnSO4.4H2O is strongly heated in air. The residue is Mn3O4.

(ii). The residue is dissolved in 100 ml of 0.1N FeSO4 containing dilute H2SO4.

(iii). The solution reacts completely with 50 ml of KMnO4 solution.

(iv). 25 ml of the KMnO4 solution used in step (iii) requires 30 ml of 0.1 N FeSO4 solution for complete reaction.

Find the amount of MnSO4.4H2O present in the sample
2
IIT-JEE 1980
Subjective
+2
-0

(a) 1 litre of a mixture of CO and CO2 is taken. This mixture is passed through a tube containing red hot charcoal. The volume now becomes 1.6 litre. The volumes are measured under the same conditions. Find the composition of the mixture by volume.

(b) A compound contains 28 percent of nitrogen and 72 percent of metal by weight. 3 atoms of metal combine with 2 atoms of N. Find the atomic weight of metal.

3
IIT-JEE 1979
Subjective
+2
-0
4.215 g of a metallic carbonate was heated in a hard glass tube and the CO2 evolved was found to measure 1336 ml at 27oC and 700 mm pressure. What is the equivalent weight of metal?
4
IIT-JEE 1979
Subjective
+4
-0
(a). 5.5 g of a mixture FeSO4.7H2O and Fe2(SO4)3.9H2O requires 5.4 ml of 0.1 N KMnO4 solution for complete oxidation. Calculate the number of gram mole of hydrated ferric sulphate in the mixture.

(b). The vapour density (hydrogen = 1) of a mixture consisting of NO2 and N2O4 is 38.3 at 26.7oC. Calculate the number of moles of NO2 in 100 g of the mixure.
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