Stoichiometry
Which of the following is an exothermic reaction?

Decomposition of water
Conversion of graphite to diamond
None of these
Dehydrogenation of ethane to ethylene

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Stoichiometry
A long cylinder and a sphere both of 5 cms diameter are made from the same porous material. The flat ends of cylinder are sealed. Both the cylinder and sphere are saturated with the same solution of sodium chloride. Later both the objects are immersed for a short and equal interval of time in a large tank of water which is well agitated. The fraction of salt remaining in the cylinder and the sphere are Xc and Xs respectively. Which of the following statement is correct?

Xc > Xs
Xc = Xs
Xc < Xs
Xc greater/less than Xs depending on the length of the cylinder

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Stoichiometry
Raoult's law states that 'the equilibrium vapor pressure that is exerted by a component in a solution is proportional to the mole fraction of that component'. This generalisation is based on the assumption that the

All of these
Component molecules are non-polar and no chemical combination or molecular association between unlike molecules takes place in the formation of the solution
Sizes of the component molecules are approximately equal
Attractive forces between like and unlike molecules are approximately equal

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