1

IIT-JEE 1982

Subjective

+4

-0

Hydroxylamine reduces iron (III) according to the equation:

2NH

Iron (II) thus produced is estimated by titration with a standard permanganate solution. The reaction is :

$$MnO_4^-$$ + 5Fe

A 10 ml sample of hydroxylamine solution was Diluted to 1 litre. 50 ml of this diluted solution was boiled with an excess of iron (III) solution. The resulting solution required 12 ml of 0.02 M KMnO

2NH

_{2}OH + 4Fe^{3+}$$\to$$ N_{2}O(g) $$ \uparrow $$ + H_{2}O + 4Fe^{2+}+ 4H^{+}Iron (II) thus produced is estimated by titration with a standard permanganate solution. The reaction is :

$$MnO_4^-$$ + 5Fe

^{2+}+ 8H^{+}$$\to$$ Mn^{2+}+ 5Fe^{3+}+ 4H_{2}OA 10 ml sample of hydroxylamine solution was Diluted to 1 litre. 50 ml of this diluted solution was boiled with an excess of iron (III) solution. The resulting solution required 12 ml of 0.02 M KMnO

_{4}solution for complete oxidation of iron (II). Calculate the weight of hydroxylamine in one litre of the original solution. (H = 1, N = 14, O = 16, K =39, Mn = 55, Fe = 56)2

IIT-JEE 1981

Subjective

+3

-0

A 1.00 gm sample of H

_{2}O_{2}solution containing X percent H_{2}O_{2}by weight requires X ml of a KMnO_{4}solution for complete oxidation under acidic conditions. Calculate the normality of the KMnO_{4}solution.3

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.4

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)

Questions Asked from Some Basic Concepts of Chemistry (Subjective)

Number in Brackets after Paper Indicates No. of Questions

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