1

IIT-JEE 1980

Subjective

+4

-0

**(a)**One litre of a sample of hard water contains 1 mg of CaCl

_{2}and 1 mg of MgCl

_{2}. Find the total hardness in terms of parts of CaCO

_{3}per 10

^{6}parts of water by weight.

**(b)**A sample of hard water contains 20 mg of Ca

^{++}ions per litre. How many milli-equivalent of Na

_{2}CO

_{3}would be required to soften 1 litre of the sample?

**(c)**1 gm of Mg is burnt in a closed vessel which contains 0.5gm of O

_{2}.

(i) Which reactant is left in excess?

(ii) Find the weight of the excess reactants.

(iii) How many milliliters of 0.5N H

_{2}SO

_{4}will dissolve the residue in the vessel?

2

IIT-JEE 1979

Subjective

+2

-0

4.215 g of a metallic carbonate was heated in a hard glass tube and the CO

_{2}evolved was found to measure 1336 ml at 27^{o}C and 700 mm pressure. What is the equivalent weight of metal?3

IIT-JEE 1979

Subjective

+4

-0

**(a)**. 5.5 g of a mixture FeSO

_{4}.7H

_{2}O and Fe

_{2}(SO

_{4})

_{3}.9H

_{2}O requires 5.4 ml of 0.1 N KMnO

_{4}solution for complete oxidation. Calculate the number of gram mole of hydrated ferric sulphate in the mixture.

**(b)**. The vapour density (hydrogen = 1) of a mixture consisting of NO

_{2}and N

_{2}O

_{4}is 38.3 at 26.7

^{o}C. Calculate the number of moles of NO

_{2}in 100 g of the mixure.

4

IIT-JEE 1979

Subjective

+4

-0

5 ml of a gas containing only carbon and hydrogen were mixed with an excess of oxygen (30 ml) and the mixture exploded by means of an electric spark. After the explosion, the volume of the mixed gases remaining was 25 ml. On adding a concentrated solution of potassium hydroxide, the volume further diminished to 15 ml of the residual gas being pure oxygen. All volumes have been reduced to N.T.P. Calculate the molecular formula of the hydrocarbon gas.

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)

JEE Advanced Subjects

Physics

Mechanics

Units & Measurements Motion Laws of Motion Work Power & Energy Impulse & Momentum Rotational Motion Properties of Matter Heat and Thermodynamics Simple Harmonic Motion Waves Gravitation

Electricity

Electrostatics Current Electricity Capacitor Magnetism Electromagnetic Induction Alternating Current Electromagnetic Waves

Optics

Modern Physics

Chemistry

Physical Chemistry

Some Basic Concepts of Chemistry Structure of Atom Redox Reactions Gaseous State Equilibrium Solutions States of Matter Thermodynamics Chemical Kinetics and Nuclear Chemistry Electrochemistry Solid State & Surface Chemistry

Inorganic Chemistry

Periodic Table & Periodicity Chemical Bonding & Molecular Structure Isolation of Elements Hydrogen s-Block Elements p-Block Elements d and f Block Elements Coordination Compounds Salt Analysis

Organic Chemistry

Mathematics

Algebra

Quadratic Equation and Inequalities Sequences and Series Mathematical Induction and Binomial Theorem Matrices and Determinants Permutations and Combinations Probability Vector Algebra and 3D Geometry Statistics Complex Numbers

Trigonometry

Coordinate Geometry

Calculus