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A single-effect evaporator is used to concentrate 60000 kg h-1 of a 40 wt % NaOH solution which is fed to the evaporator at 40°C. The concentrated liquid is a 55 wt % NaOH solution. Saturated steam at 3 atm is available for heating. The vapour space in the evaporator is at a pressure of 10 kPa. The overall heat transfer coefficient is 2000 W m-2 K-1 Determine:
a) the amount of vapour produced.
b) the area required for the evaporator. Include clearly values of relevant properties. c) the economy.
Number of unpaired electrons in inert gas is: (1) Zero (2) 8 (3) 4 (4) 18 Ans: Zero
No. of KMnO4 required to oxidise 1 mole of Fe(C2O2) in acidic medium? Solution) 1 mole of KMnO4 is required for oxidation of 1 mole of Fe(C2O2). 2KMno4+2Fe(C2O2)+6H2SO4 = K2S
give an example of tri atomic gass
Define Interfacial potential differences? What is the source of an open-circuit, zero-current cell potential? When no electric current passes through the cell, the electric pot
Addition of Grignard reagents: Grignard reagents react along with carbonyl compounds to offer alcohols. Nature of alcohol lies on the nature of carbonyl compound. Addition o
How do you explain in the absence of aldehyde group in the pentaacetate of D-glucose? Ans) when you react glucose with acetic anhydrate it forms pentaacetate with 5 OH grops it
0.22(6.022)(10^23)
Which quantum number is not related with Schrodinger equation: (1) Principal (2) Azimuthal (3) Magnetic (4)Spin Ans: Spin
physical properties
WHAT IS USE OF ION PAIR REAGENTS? The chemical substances that pair each other, to produces complexes. These can use for stabilization of one of the molecule that is more active
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