Related Questions

Which of the following is not a Lewis acid?
A aluminium chloride
B sodium ion
C sulphur tetrafluoride
D hydroxide ion
কোনটি লুইস এসিড? (Which is a Lewis acid?)
A HCI
B Ag+
C NH4+
D CO
a chemial is mixed 30 ml mixed , 10 ml is acid , how much ml of acid must be mixed such that a 50/50 mixure of water and acid is attend if no additional water is added
A 20
B 10
C 40
D 30
How many liters of a 90% of concentrated acid needs to be mixed with a 75% Solution of concentrated acid to get a 30 liter Solution of 78% concentrated acid?
A 8
B 6
C 7
D 9
The molecular mass of sulphuric acid is 98. If 49 g of the acid is dissolved in water to make one litre of solution, what will be the strength of the acid?
A Two normal
B One normal
C 0.5 normal
D Four normal
For which of the following unit operations, Lewis number is of significance?
A Adsorption
B Binary distillation
C Gas absorption
D Humidification
Lewis number, which is important in problems involving simultaneous heat and mass transfer, is the ratio of
A Mass diffusivity to momentum diffusivity
B Thermal diffusivity to mass diffusivity
C Momentum diffusivity to thermal diffusivity
D None of these
নিচের কোনটি লুইস ( Lewis ) এসিড?
A         SO3 
B BF3
C  H+
D সবগুলো
Lewis equation in gears is used to find the
A Tensile stress in bending
B Shear stress
C Compressive stress in bending
D Fatigue stress
The value of Lewis form factor used in design of gears is
A Dependent on number of teeth of a gear
B Dependent on system of teeth
C Independent of size of teeth
D All of these

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