IIT-JEE 1980

Which of the following compounds are covalent?

The total number of electrons that take part in forming the bond in N2 is

Which of the following is soluble in water?

Element X is strongly electropositive and element Y is strongly electronegative. Both are univalent. The compound formed would be

M is molecular weight of KMnO4. The equivalent wight of KMnO4 when it is converted into K2MnO4 is

Calcium is obtained by

HCL is added to the following oxides. Which one would give H2O2?

Anhydrous MgCl2 is obtained by hydrated salt with ______.

Explain the following in not more than two sentenses.
A solution of FeCl3
in water gives a brown precipitate on
standing.

Compound A is a light green crystalline solid. It gives
the following tests :
(i) It dissolves in dilute sulphuric acid. No gas is
produced.
(ii) A drop of KMnO4
is added to the above solution. The
pink colour disappears.
(iii) Compound A ...

A hydrocarbon contains 10.5 g of carbon per gram of hydrogen. 1 litre of the hydrocarbon at 127oC and 1 atmosphere weighs 2.8 g. Find the molecular formula.

The total no of electron present in 18 ml of water is ______.

(a) One litre of a sample of hard water contains 1 mg of CaCl2 and 1 mg of MgCl2. Find the total hardness in terms of parts of CaCO3 per 106 parts of water by weight.
(b) A sample of hard water contains 20 mg of Ca++ ions per litre. How man...

A mixture contains NaCl and unknown chloride MCl.
(i) 1g of this is dissolved in water. Excess of acidified AgNO3 solution is added to it. 2.567 g of white ppt is formed.
(ii) 1 g of original mixture is heated to 300oC. Some vapours come ou...

Find
(i) The total number of neutrons and
(ii) The total mass of neutron in 7 mg of 14C
(Assume that mass of neutron = mass of hydrogen atom)

(a) 1 litre of a mixture of CO and CO2
is taken. This
mixture is passed through a tube containing red hot
charcoal. The volume now becomes 1.6 litre. The
volumes are measured under the same conditions.
Find the composition of the mixture b...

The modern atomic unit is based on the mass of ______.

(i). A sample of MnSO4.4H2O is strongly heated in air. The residue is Mn3O4.
(ii). The residue is dissolved in 100 ml of 0.1N FeSO4 containing dilute H2SO4.
(iii). The solution reacts completely with 50 ml of KMnO4 solution.
(iv). 25 ml of ...