1
IIT-JEE 1979
Subjective
+3
-0

Account for the following : Limit your answer to two sentences.

"Atomic weights of most of the elements are fractional."

2
IIT-JEE 1978
Subjective
+2
-0
What weight of AgCl will be precipitated when a solution containing 4.77 g of NaCl is added to a solution of 5.77g of AgNO3?
3
IIT-JEE 1978
Subjective
+2
-0
One gram of an alloy of aluminium and magnetism when treated with excess of dil. HCl forms magnesium chloride, aluminium chloride and hydrogen. The evolved hydrogen, collected over mercury at $${0^o}C$$ has a volume of 1.20 litres at 0.92 atm. pressure. Calculate the composition of the alloy. [H = 1, Mg = 24, Al = 27]
4
IIT-JEE 1978
Subjective
+4
-0
Igniting MnO2 converts it quantitatively to Mn3O4. A sample of pyrolusite is of the following composition : MnO2 80%, SiO2 and other inert constituents 15%, rest being water. The sample is ignited in air to constant weight. What is the percentage of Mn in the ignited sample? [O = 16, Mn = 54.9]
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