1

IIT-JEE 1999

Subjective

+3

-0

How many millilitres of 0.5 M H

_{2}SO_{4}are needed to dissolve 0.5 g of copper(II) carbonate?2

IIT-JEE 1999

Subjective

+3

-0

A plant virus is found to consist of uniform cylindrical particles of 150 Å in diameter and 5000 Å long. The specific volume of the virus is 0.75 cm

^{3}/g. If the virus is considered to be a single particle, find its molar mass.3

IIT-JEE 1998

Subjective

+5

-0

An aqueous solution containing 0.10 g KIO

_{3}(formula weight = 214.0) was treated with an excess of KI solution. The solution was acidified with HCl. The liberated I_{2}consumed 45.0 mL of thiosulphate solution to decolourise the blue strach-iodine complex. Calculate the molarity of the sodium thiosulphate solution.4

IIT-JEE 1996

Subjective

+5

-0

A 3.00 g sample containing Fe

_{3}O_{4}, Fe_{2}O_{3}and an inert impure substance is treated with excess of KI solution in presence of dilute H_{2}SO_{4}. The entire iron is converted into Fe^{2+}along with the liberation of iodine. The resulting solution is diluted to 100 ml, A 20 ml of the diluted solution requires 11.0 ml of 0.5 M Na_{2}S_{2}O_{3}solution to reduce the iodine present. A 50 ml of the diluted solution, after complete extraction of the iodine requires 12.80 ml of 0.25 M KMnO_{4}solution in the dilute H_{2}SO_{4}medium for the oxidation of Fe^{2+}. Calculate the percentages of Fe_{2}O_{3}and Fe_{3}O_{4}in the original sample.Questions Asked from Some Basic Concepts of Chemistry (Subjective)

Number in Brackets after Paper Indicates No. of Questions

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