1

IIT-JEE 1989

Subjective

+5

-0

An equal volume of a reducing agent is titrated separately with 1M KMnO

_{4}in acid neutral and alkaline media. The volumes of KMnO_{4}required are 20 ml. in acid 33.4 ml. neutral and 100 ml in alkaline media. Find out the oxidation state of manganese in each reduction product. Give the balanced equations for all three half reactions. Find out the volume of 1M K_{2}Cr_{2}O_{7}consumed; if the same volume of the reducing agent is titrated in acid medium.2

IIT-JEE 1988

Subjective

+3

-0

A sample of hydrazine sulphate (N

4Fe

$$MnO_4^-$$ + 4Fe

_{2}H_{6}SO_{4}) was dissolved in 100 ml. of water, 10 ml of this solution was reacted with excess of ferric chloride solution and warmed to complete the reaction. Ferrous ion formed was estimated and it required 20 ml of M/50 potassium permanganate solution. Estimate the amount of hydrazine sulphate in one litre of the solution.**Reaction:**4Fe

^{3+}+ N_{2}H_{4}$$\to$$ N_{2}+ 4Fe^{2+}+ 4H^{+}$$MnO_4^-$$ + 4Fe

^{2+}+ 8H^{+}$$\to$$ Mn^{2+}+ 5Fe^{3+}+ 4H_{2}O3

IIT-JEE 1988

Subjective

+2

-0

A sugar syrup of weight 214.2 g contains 34.2 g of sugar (C

_{12}H_{22}O_{11}). Calculate**(i)**molal concentration and**(ii)**mole fraction of sugar in the syrup4

IIT-JEE 1987

Subjective

+5

-0

**(i)**What is the weight of sodium bromate and molarity pf solution necessary to prepare 85.5 ml of 0.672 B solution when the half-cell reaction is

$$BrO_3^- + 6H^+ + 6e^- \to $$ $$Br^- + 3H_2O$$

**(ii)**What would be the weight as well as molarity if the half-cell reaction is:

$$2BrO_3^- + 12H^+ + 10e^- \to$$ $$Br_2 \,+ 6H_2O$$

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)
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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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