1

IIT-JEE 1980

Subjective

+2

-0

(a) 1 litre of a mixture of CO and CO_{2}
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.

2

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

3

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?

4

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?Questions Asked from Some Basic Concepts of Chemistry (Subjective)

Number in Brackets after Paper Indicates No. of Questions

IIT-JEE 2003 (1)
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IIT-JEE 1980 (6)
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