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February 2019

Calcination reaction of limestone (CaCO3 → CaO + CO2) goes to completion in the rotary kiln, because____________________?

Chemical Reaction /
Calcination reaction of limestone (CaCO3 → CaO + CO2) goes to completion in the rotary kiln, because____________________?

A. CaO is not dissociated
B. CO2 escapes continuously
C. Of high calcination temperature
D. CaO is more stable than CaCO3

Calcination reaction of limestone (CaCO3 → CaO + CO2) goes to completion in the rotary kiln, because____________________? Read More »

Chemical Reaction

Which of the following curves shows the effect of temperature on the extent of gas-solid adsorption at a given pressure ?

Chemical Reaction /
Which of the following curves shows the effect of temperature on the extent of gas-solid adsorption at a given pressure ?

A. Langmuir adsorption isotherm
B. Adsorption isobar
C. Freundlich adsorption isotherm
D. None of these

Which of the following curves shows the effect of temperature on the extent of gas-solid adsorption at a given pressure ? Read More »

Chemical Reaction

Concentration of the limiting reactant (with initial concentration of a moles/litre) after time t is (a-x). Then ‘t’ for a first order reaction is given by____________________?

Chemical Reaction /
Concentration of the limiting reactant (with initial concentration of a moles/litre) after time t is (a-x). Then ‘t’ for a first order reaction is given by____________________?

A. k. t = ln a/(a – x)
B. k. t = x/a (a – x)
C. k. t = ln (a – x)/a
D. k. t = ln a (a – x)/x

Concentration of the limiting reactant (with initial concentration of a moles/litre) after time t is (a-x). Then ‘t’ for a first order reaction is given by____________________? Read More »

Chemical Reaction

Pure A in gas phase enters a reactor 50% of this A is converted to B through the reaction, A → 3B. Mole fraction of A in the exit stream is______________________?

Chemical Reaction /
Pure A in gas phase enters a reactor 50% of this A is converted to B through the reaction, A → 3B. Mole fraction of A in the exit stream is______________________?

A. 1/2
B. 1/3
C. 1/4
D. 1/5

Pure A in gas phase enters a reactor 50% of this A is converted to B through the reaction, A → 3B. Mole fraction of A in the exit stream is______________________? Read More »

Chemical Reaction

A chemical reaction occurs when the energy of the reacting molecules is __________________ the activation energy of the reaction?

Chemical Reaction /
A chemical reaction occurs when the energy of the reacting molecules is __________________ the activation energy of the reaction?

A. Less than
B. Equal to
C. More than
D. Equal to or more than

A chemical reaction occurs when the energy of the reacting molecules is __________________ the activation energy of the reaction? Read More »

Chemical Reaction