Dry air is a mixture of__________________?
Dry air is a mixture of__________________?
A. Vapors
B. Gases
C. Both A. & B.
D. Neither A. nor B.
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1 Kcal/kg. °C is equivalent to _______________ BTU/lb. °F ?
1 Kcal/kg. °C is equivalent to _______________ BTU/lb. °F ?A. 1
B. 2.42
C. 4.97
D. None of these_____________ kg of CaC03 on heating will give 56 kg of CaO?
_____________ kg of CaC03 on heating will give 56 kg of CaO?A. 56
B. 100
C. 144
D. 1000The crystallisation of a solute from a solution may be done by________________?
The crystallisation of a solute from a solution may be done by________________?A. Removal of pure solvent by evaporation
B. Change of temperature thereby causing super-saturation
C. Changing the nature of the system by the addition of a more soluble material
D. All A., B. & C.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 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 cylinderpH value of a solution containing equal concentration of hydroxyl and hydrogen ions will be_________________?
pH value of a solution containing equal concentration of hydroxyl and hydrogen ions will be_________________?A. 0
B. 10
C. 7
D. 14A fluid gas produced on burning furnace oil contains 0.15 gm mole of CO2, 0.05 gm mole of oxygen and 0.80 gm mole of N2. What is its molecular weight ?
A fluid gas produced on burning furnace oil contains 0.15 gm mole of CO2, 0.05 gm mole of oxygen and 0.80 gm mole of N2. What is its molecular weight ?A. 28.6
B. 30.0
C. 30.6
D. 32.6