Our website is made possible by displaying online advertisements to our visitors. Please consider supporting us by whitelisting our website.

February 2019

A space velocity of 5 hr-1 means that ___________________?

Chemical Reaction /
A space velocity of 5 hr-1 means that ___________________?

A. Five reactor volumes of feed (at specified conditions) are being fed into the reactor per hour
B. After every 5 hours, reactor is being filled with the feed
C. Cent per cent conversion can be achieved in at least 5 hours
D. A fixed conversion of a given batch of feed takes 5 hours

A space velocity of 5 hr-1 means that ___________________? Read More »

Chemical Reaction

The reaction A → B is conducted in an adiabatic plug flow reactor (PFR). Pure A at a concentration of 2 kmol/m3is fed to the reactor at the rate of 0.01 m3 /s and at a temperature of 500 K. If the exit conversion is 20%, then the exit temperature (in k) is (Data: Heat of reaction at 298 K = – 50000 kJ/ kmole of A reacted Heat capacities CPA = CPB = 100kJ/kmole. K (may be assumed to be independent of temperature)) ?

Chemical Reaction /
The reaction A → B is conducted in an adiabatic plug flow reactor (PFR). Pure A at a concentration of 2 kmol/m3is fed to the reactor at the rate of 0.01 m3 /s and at a temperature of 500 K. If the exit conversion is 20%, then the exit temperature (in k) is (Data: Heat of reaction at 298 K = – 50000 kJ/ kmole of A reacted Heat capacities CPA = CPB = 100kJ/kmole. K (may be assumed to be independent of temperature)) ?

A. 400
B. 500
C. 600
D. 1000

The reaction A → B is conducted in an adiabatic plug flow reactor (PFR). Pure A at a concentration of 2 kmol/m3is fed to the reactor at the rate of 0.01 m3 /s and at a temperature of 500 K. If the exit conversion is 20%, then the exit temperature (in k) is (Data: Heat of reaction at 298 K = – 50000 kJ/ kmole of A reacted Heat capacities CPA = CPB = 100kJ/kmole. K (may be assumed to be independent of temperature)) ? Read More »

Chemical Reaction

For the non catalytic reaction of particles with surrounding fluid, the same needed to achieve the same fractional conversion for particles of different unchanging sizes is proportional to the particle diameter, when the ________________ is the controlling resistance?

Chemical Reaction /
For the non catalytic reaction of particles with surrounding fluid, the same needed to achieve the same fractional conversion for particles of different unchanging sizes is proportional to the particle diameter, when the ________________ is the controlling resistance?

A. Film diffusion
B. Diffusion through ash layer
C. Chemical reaction
D. Either A., B. or C.

For the non catalytic reaction of particles with surrounding fluid, the same needed to achieve the same fractional conversion for particles of different unchanging sizes is proportional to the particle diameter, when the ________________ is the controlling resistance? Read More »

Chemical Reaction

Which provincial police of Pakistan has launched the Mobile App with the name of Police4u?

Pakistan Current Affairs MCQs /
Which provincial police of Pakistan has launched the Mobile App with the name of Police4u?

A. Sindh Police
B. kpk police
C. Punjab Police
D. Balochistan police

The Sindh Police on Jan 14 2019 formally inaugurated a new mobile application to facilitate the people of southeastern Pakistani province.
Additional Inspector General of Police (AIGP) Karachi, Dr Ameer Ahmed Sheikh and other senior officers of Sindh Police attended the launching ceremony in Karachi.
The mobile application can be downloaded from Google App Playstore
 

Which provincial police of Pakistan has launched the Mobile App with the name of Police4u? Read More »

Pakistan Current Affairs MCQs

For every 10°C rise in temperature, the rate of chemical reaction doubles. When the temperature is increased from 30 to 70°C, the rate of reaction increases ______________ times?

Chemical Reaction /
For every 10°C rise in temperature, the rate of chemical reaction doubles. When the temperature is increased from 30 to 70°C, the rate of reaction increases ______________ times?

A. 8
B. 12
C. 16
D. 32

For every 10°C rise in temperature, the rate of chemical reaction doubles. When the temperature is increased from 30 to 70°C, the rate of reaction increases ______________ times? Read More »

Chemical Reaction

Which of the following resistances is not involved in a gas phase catalytic (gas-solid) reaction ?

Chemical Reaction /
Which of the following resistances is not involved in a gas phase catalytic (gas-solid) reaction ?

A. Ash resistance
B. Gas film and pore surface diffusion resistances for reactants
C. Surface phenomenon resistance
D. Gas film and pore surface diffusion resistances for products

Which of the following resistances is not involved in a gas phase catalytic (gas-solid) reaction ? Read More »

Chemical Reaction

The minimum energy required to allow a chemical reaction to proceed is termed as the ‘threshold energy ‘. Chemical reactions with low activation energy are ________________?

Chemical Reaction /
The minimum energy required to allow a chemical reaction to proceed is termed as the ‘threshold energy ‘. Chemical reactions with low activation energy are ________________?

A. Always irreversible
B. Insensitive to temperature changes
C. Mostly irreversible
D. Highly temperature sensitive

The minimum energy required to allow a chemical reaction to proceed is termed as the ‘threshold energy ‘. Chemical reactions with low activation energy are ________________? Read More »

Chemical Reaction

A liquid decomposes by irreversible first order kinetics and the half life period of this reaction is 8 minutes. The time required for 75% conversion of the liquid will be ____________________ minutes?

Chemical Reaction /
A liquid decomposes by irreversible first order kinetics and the half life period of this reaction is 8 minutes. The time required for 75% conversion of the liquid will be ____________________ minutes?

A. 4
B. 8
C. 12
D. 16

A liquid decomposes by irreversible first order kinetics and the half life period of this reaction is 8 minutes. The time required for 75% conversion of the liquid will be ____________________ minutes? Read More »

Chemical Reaction