1
IIT-JEE 1998
Subjective
+5
-0
The rate constant of a reaction is 1.5 $$\times$$ 107 s-1 at 50oC and 4.5 $$\times$$ 107 s-1 at 100oC. Evaluate the Arrhenius parameters A and Ea.
2
IIT-JEE 1996
Subjective
+3
-0
The ionisation constant of $$NH_4^+$$ in water is 5.6 $$\times$$ 10-10 at 25oC. The rate constant for the reaction of $$NH_4^+$$ and $$OH^-$$ to form NH3 and H2O at 25oC is 3.4 $$\times$$ 1010 L mol-1s-1. Calculate the rate constant for proton transfer from water to NH3.
3
IIT-JEE 1995
Subjective
+4
-0
At 380oC, the half-life period for the first order decomposition of H2O2 is 360 min. Calculate the time required for 75% decomposition at 450oC.
4
IIT-JEE 1993
Subjective
+4
-0
A first order reaction A $$\to$$ B, requires activation energy of 70 kJ mol-1. When 20% solution of A was kept at 25oC for 20 minutes, 25% decomposition tooks place. What will be the percentage decomposition in the same time in a 30% solution maintained at 40oC? Assume that activation energy remains constant in this range of temperature.
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