1
IIT-JEE 1981
MCQ (Single Correct Answer)
+1
-0.25
A solution of sodium metal in liquid ammonia is strongly reducing due to the presence of
A
sodium atoms
B
sodium hydride
C
sodium amide
D
solvated electrons
2
IIT-JEE 1981
Subjective
+1
-0
Give reasons of the following:
Sodium carbonate is made by Solvay process but the same process is not extended to the manufacture of potassium carbonate.
3
IIT-JEE 1981
Subjective
+3
-0
The vapour pressure of pure benzene is 639.7 mm of mercury and the vapour of a solution of a solute in benzene at the same temperature is 631.9 mm of mercury. Calculate this molality of the solution.
4
IIT-JEE 1981
Fill in the Blanks
+2
-0
Suppose $${\sin ^3}\,x\sin 3x = \sum\limits_{m = 0}^n {{C_m}\cos \,mx} $$ is an identity in x, where C0, C1 ,....Cn are constants, and $${C_n} \ne 0$$ , then the value of n is _____.
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