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.Management Sciences
Category: 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 ?
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.
Increasing the temperature of an aqueous solution will cause decrease in its________________?
A. Molality
B. Mole fraction
C. Weight percent
D. Molarity
Fireclay bricks are used in the______________?
A. Coke ovens regenerator
B. Outer lining of L.D. converter
C. Hearth bottom of blast furnace
D. Coke oven walls
During a phase change process like sublimation, vaporisation, melting etc., the specific ____________ does not change?
A. Enthalpy
B. Gibbs free energy
C. Internal energy
D. Entropy
Pick out the wrong statement?
A. Heat capacity of a diatomic gas is higher than that of a monatomic gas
B. Equal volumes of Argon and Krypton contain equal number of atoms
C. Total number of molecules contained in 22.4 litres of hydrogen at NTP is 6.023 x 1023
D. The binary mixture of a particular composition in both vapor and liquid state is known as an azeotropic mixture
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