1

IIT-JEE 1980

Subjective

+4

-0

**(i)**. A sample of MnSO

_{4}.4H

_{2}O is strongly heated in air. The residue is Mn

_{3}O

_{4}.

**(ii)**. The residue is dissolved in 100 ml of 0.1N FeSO

_{4}containing dilute H

_{2}SO

_{4}.

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

_{4}solution.

**(iv)**. 25 ml of the KMnO

_{4}solution used in step

**(iii)**requires 30 ml of 0.1 N FeSO

_{4}solution for complete reaction.

Find the amount of MnSO

_{4}.4H

_{2}O present in the sample

2

IIT-JEE 1980

Subjective

+4

-0

**(a)**One litre of a sample of hard water contains 1 mg of CaCl

_{2}and 1 mg of MgCl

_{2}. Find the total hardness in terms of parts of CaCO

_{3}per 10

^{6}parts of water by weight.

**(b)**A sample of hard water contains 20 mg of Ca

^{++}ions per litre. How many milli-equivalent of Na

_{2}CO

_{3}would be required to soften 1 litre of the sample?

**(c)**1 gm of Mg is burnt in a closed vessel which contains 0.5gm of O

_{2}.

(i) Which reactant is left in excess?

(ii) Find the weight of the excess reactants.

(iii) How many milliliters of 0.5N H

_{2}SO

_{4}will dissolve the residue in the vessel?

3

IIT-JEE 1979

Subjective

+2

-0

4.215 g of a metallic carbonate was heated in a hard glass tube and the CO

_{2}evolved was found to measure 1336 ml at 27^{o}C 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 FeSO

_{4}.7H

_{2}O and Fe

_{2}(SO

_{4})

_{3}.9H

_{2}O requires 5.4 ml of 0.1 N KMnO

_{4}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 NO

_{2}and N

_{2}O

_{4}is 38.3 at 26.7

^{o}C. Calculate the number of moles of NO

_{2}in 100 g of the mixure.

Questions Asked from Some Basic Concepts of Chemistry (Subjective)

Number in Brackets after Paper Indicates No. of Questions

IIT-JEE 2003 (1)
IIT-JEE 2001 (1)
IIT-JEE 1999 (2)
IIT-JEE 1998 (1)
IIT-JEE 1996 (1)
IIT-JEE 1994 (2)
IIT-JEE 1993 (1)
IIT-JEE 1992 (2)
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IIT-JEE 1990 (3)
IIT-JEE 1989 (1)
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IIT-JEE 1987 (1)
IIT-JEE 1986 (5)
IIT-JEE 1985 (1)
IIT-JEE 1983 (7)
IIT-JEE 1982 (1)
IIT-JEE 1981 (2)
IIT-JEE 1980 (6)
IIT-JEE 1979 (5)
IIT-JEE 1978 (4)

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