1

IIT-JEE 1980

Subjective

+2

-0

A hydrocarbon contains 10.5 g of carbon per gram of hydrogen. 1 litre of the hydrocarbon at 127

^{o}C and 1 atmosphere weighs 2.8 g. Find the molecular formula.2

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.

3

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)

4

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.

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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