1

IIT-JEE 1980

Subjective

+2

-0

A mixture contains NaCl and unknown chloride MCl.

Find the molecular weight of unknown chloride.

**(i)**1g of this is dissolved in water. Excess of acidified AgNO_{3}solution is added to it. 2.567 g of white ppt is formed.**(ii)**1 g of original mixture is heated to 300^{o}C. Some vapours come out which are absorbed in acidified AgNO_{3}solution, 1.341 g of white precipitate was obtained.Find the molecular weight of unknown chloride.

2

IIT-JEE 1980

Subjective

+2

-0

Find

(Assume that mass of neutron = mass of hydrogen atom)

**(i)**The total number of neutrons and**(ii)**The total mass of neutron in 7 mg of^{14}C(Assume that mass of neutron = mass of hydrogen atom)

3

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.

4

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

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)
IIT-JEE 1991 (2)
IIT-JEE 1990 (3)
IIT-JEE 1989 (1)
IIT-JEE 1988 (2)
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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