IIT-JEE 1979

The compound which contains both ionic and covalent bonds is

The octet rule is not valid for the molecule

A white amorphous powder (A) on heating yields a
colourless, non-combustible gas (B) and a solid (C).
The latter compound assumes a yellow colour on heating
and changes to white on cooling. (C) dissolves in dilute
acid and the resulting sol...

The precipitation of second group sulphides in qualitative
analysis is carried out with hydrogen sulphide in the presence
of hydrochloric acid but not in nitric acid. Explain.

4.215 g of a metallic carbonate was heated in a hard glass tube and the CO2 evolved was found to measure 1336 ml at 27oC and 700 mm pressure. What is the equivalent weight of metal?

The total number of electrons is one molecule of carbon dioxide is

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 concen...

The largest number of molecules is in

(a). 5.5 g of a mixture FeSO4.7H2O and Fe2(SO4)3.9H2O requires 5.4 ml of 0.1 N KMnO4 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 ...

Account for the following : Limit your answer to two
sentences.
"Atomic weights of most of the elements are fractional."

In the analysis of 0.5 g sample feldspar, a mixture of chlorides of sodium and potassium is obtained which weighs 0.1180g. Subsequent treatment of mixed chlorides with silver nitrate gives 0.2451 g of silver chloride. What is the percentage...

2.76 g of silver carbonate on being strongly heated yields a residue weighing

A gaseous mixture contains oxygen and nitrogen in the ratio of 1 : 4 by weight. Therefore the ratio of their no of molecules is

The number of neutrons in dipositive zinc ion with mass number 70 is