1
IIT-JEE 1990
Subjective
+3
-0
The vapour pressure of pure benzene at a certain temperature is 640 mm Hg. A non-volatile non-electrolyte solid weighing 2.175 g is added to 39.0 g of benzene. The vapour pressure of the solution is 600 mm Hg. What is the molecular weight of the solid substance?
2
IIT-JEE 1990
Subjective
+1
-0

Give the IUPAC name of the following compound :

IIT-JEE 1990 Chemistry - Basics of Organic Chemistry Question 14 English
3
IIT-JEE 1990
Subjective
+4
-0
Prove that for any positive integer $$k$$,
$${{\sin 2kx} \over {\sin x}} = 2\left[ {\cos x + \cos 3x + ......... + \cos \left( {2k - 1} \right)x} \right]$$
Hence prove that $$\int\limits_0^{\pi /2} {\sin 2kx\,\cot \,x\,dx = {\pi \over 2}} $$
4
IIT-JEE 1990
Subjective
+4
-0
Show that $$\int\limits_0^{\pi /2} {f\left( {\sin 2x} \right)\sin x\,dx = \sqrt 2 } \int\limits_0^{\pi /4} {f\left( {\cos 2x} \right)\cos x\,dx} $$
JEE Advanced Papers
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