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.Management Sciences
Category: Stoichiometry
Hess’s law of constant heat summation is based on conservation of mass. It deals with ___________________?
A. Equilibrium constant
B. Reaction rate
C. Changes in heat of reaction
D. None of these
1 gm mole of an alcohol whose molecular weight is 74 contains 48 gms of carbon, 10 gms of hydrogen and 16 gms of oxygen. Its molecular formula is__________________?
A. C4H9OH
B. C3H21OH
C. (C2H4)2H2.OH
D. C2H33OH
A rigid vessel containing three moles of nitrogen gas at 30°C is heated to 250°C. Assume the average capacities of nitrogen to be Cp = 29.1 J/mole.°C and, Cv = 20.8 J/mole.°C. The heat required, neglecting the heat capacity of the vessel, is__________________?
A. 13728 J
B. 19206 J
C. 4576 J
D. 12712 J
Pick out the wrong statement?
A. The integral heat of solution of either component cannot be calculated from heat of mixing
data
B. The average value of heat of neutralisation of dilute solutions of weak acids and bases is much
less compared to that for strong acids and bases
C. The standard heat of solution of the hydrate of a substance is the difference between the heat
of solution of the anhydrous substance and its heat of hydration
D. The accompanying enthalpy change, when a solute is dissolved in solvent, depends upon the
nature & amount of the solute & the solvent, on the temperature & on the initial & final
concentrations of the solution
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 ?
A. Xc > Xs
B. Xc = Xs
C. Xc < Xs
D. Xc greater/less than Xs depending on the length of the cylinder
Pick out the wrong conversion formula for the conversion of weight units ?
A. 1 tonne = 1000 kg = 22.046 lbs
B. 1 U.S. ton = 907 kg = 0.907 tonne = 0.893 ton
C. 1 ton = 2240 lbs = 1016 kg = 1.016 tonnes = 1.12 U.S. tons
D. None of these
A compound was found having nitrogen and oxygen in the ratio 28 gm and 80 gm respectively. The formula of the compound is_________________?
A. N2O4
B. N2O5
C. N2O3
D. None of these
Fireclay refractories___________________?
A. Are not resistant to the action of basic slags
B. Combine with salts (e.g. chlorides sulphates etc.) & bases (e.g. lime, magnesia etc.) forming
fusible aluminates silicates etc
C. Shrink during firing
D. All A., B. and C.
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