1
IIT-JEE 1978
Subjective
+4
-0
Naturally occurring boron consists of two isotopes whose atomic weighs are 10.01 and 11.01. The atomic weight of natural oron is 10.81. Calculate the percentage of each isotope in natural boron.
2
IIT-JEE 1978
MCQ (Single Correct Answer)
+1
-0.25
The substance absorbs CO2 and violently reacts with water. The substance is
A
CaCO3
B
CaO
C
H2SO4
D
ZnO
3
IIT-JEE 1978
Subjective
+2
-0
What is the molarity and molality of a 13% solution (by weight) of sulphuric acid with a density of 1.02 g/ml? To what volume should 100 ml of this acid be diluted in order to prepare a 1.5 N solution?
4
IIT-JEE 1978
Subjective
+2
-0
If x = a + b, y = a$$\gamma $$ + b$$\beta $$ and z = a$$\beta $$ +b$$\gamma $$ where $$\gamma $$ and $$\beta $$ are the complex cube roots of unity, show that xyz = $${a^3} + {b^3}$$.
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