A. Combustion of coal particles
B. Roasting of sulphide ores
C. Manufacture of carbon disulphide from elements
D. None of these
Correct Answer: Roasting of sulphide ores ✔
Last Updated: February 20, 2019
Related MCQs
- The value of Steric factor ‘P’ in the equation k = PZeE/RT usually ranges from __________?
- Half life period of a first order irreversible reaction A → B is __________?
- A stirred tank reactor compared to tubular-flow reactor provides__________?
- The rate of an autocatalytic reaction as shown in the bellow figure, is given by – rA = k . CA . CB. In this case, the__________?
- Fluid flow in a real packed bed can be approximated as __________ model?
- The first order gas phase reaction as shown in the bellow figure is conducted isothermally in batch mode. The rate of change of conversion with time is given by__________?
- Three plug flow reactors (PFR’s) of 4, 5 & 6 m3 volumes are arranged in two branches as shown below in the figure. If the total feed rate is 300 tons/hr, then for the same conversion in each branch, the feed rate through branch II should be __________ tons/hr ?
- An irreversible first order reaction is being carried out in a CSTR and PFR of same volume. The liquid flow rates are same. The relative conversion will__________?
- For an ideal mixed flow reactor (CSTR), the exit age distribution E(t) is given by __________?
- In case of a P.F.R., there__________?
- The rate of the reaction, X → Y, quadruples when the concentration of ‘X’ is doubled. The rate expression for the reaction is, r = K Cx n, the value of ‘n’ in this case will be__________?
- The rate of a homogeneous reaction is a function of__________?
- For series reaction, the relative yield__________?
- In autocatalytic reactions ?
- The dispersion number of perfect mixed flow is__________?
- Which of the following does not produce a change in the value of rate constant of a reaction ?
- For identical flow rate, feed composition and for elementary first order reactions, ‘N’ equal sized mixed reactors in series with a total volume ‘V’ gives the same conversion as a single plug flow reactor of volume ‘V’ for constant density systems. This is true, when the value of ‘N’ is __________?
- The energy of activation of a chemical reaction ?
- If pore diffusion is the controlling step in a solid catalysed reaction, the catalyst__________?
- With the same reaction time, initial concentration and feed rate, the reaction 2A → B is carried out separately in CSTR and P.F. reactor of equal volumes. The conversion will be__________?
- Space time in flow reactor is__________?
- The rate of reaction does not decrease appreciably as the reaction proceeds in case of __________ reactions?
- The order of a chemical reaction is__________?
- The reaction rate almost gets doubled for 10°C rise in temperature. This is due to the fact that the__________?
- In an ideal P.F.R. at steady state conditions __________?
- Promoter__________?
- In the hydrodealkylation of toluene to benzene, the following reactions occur: C7H8 + H2 → C6H6 + CH4 2C6H6 ⇌ C12H10 + H2 Toluene and hydrogen are fed to a reactor in a molar ratio 1:5.80% of the toluene gets converted and the selectivity of benzene(defined as moles of benzene formed/moles of toluene converted) is 90%. The fractional conversion of hydrogen is__________?
- Vegetable oils are hydrogenated in a __________ reactor?
- B.E.T. method of finding out surface area of a catalyst, uses the extension of __________ isotherm?
- Half life period of a chemical reaction is proportional to CA0 -1, if the reaction is of __________ order?
- ‘n’ number of plug flow reactors (P.F.R) in series with a total volume ‘V’ gives the same conversion as one P.F.R. of volume__________?
- The concentration of A in a first order reaction, A → B, decreases__________?
- Time required for 50% decomposition of a liquid in an isothermal batch reactor following first order kinetics is 2 minutes. The time required for 75% decomposition will be about __________ minutes?
- A first order reaction A → B occurs in an isothermal porous catalyst pellet of spherical shape. If the concentration of A at the centre of the pellet is much less than at the external surface, the process is limited by__________?
- The use of space time is preferred over the mean residence time in the design of a/an__________?
- For a packed bed reactor; the presence of a long tail in the residence time distribution curve is an indication of ?
- Overall rate of reaction in a heterogeneous catalytic reaction depends upon the mass and energy transfer from the fluid to solid surface and its rate of reaction is usually __________ the concentration of catalyst, if it does not entail a chain mechanism?
- Fractional conversion __________ for an exothermic reversible chemical reaction, when the temperature is maximum?
- For identical flow rate and feed composition, X plug flow reactors (PER) in series with a total volume V gives the same conversion as single__________?
- The irreversible reaction, X → Y, is the special case of the reversible reaction, X ⇌ Y, in which the __________?
- Half life period of decomposition of a liquid ‘A’ by irreversible first order reaction is 12 minutes. The time required for 75% conversion of ‘A’ is __________ minutes?
- The fractional volume change between no conversion and complete conversion, for the isothermal gas phase reaction, 2A → R, is__________?
- For a heterogeneous catalytic reaction, A + B → C, with equimole feed of A and B, the initial rate – rA0 is invariant with total pressure. The rate controlling step is__________?
- Arrhenius equation represents graphically the variation between the __________ and temperature?
- The extent of a reaction is __________?
- For the reversible reaction A ⇌ 2B, if the equilibrium constant K is 0.05 mole/litre; starting from initially 2 moles of A and zero moles of B, how many moles will be formed at equilibrium ?
- Bulk diffusion in catalyst pore __________ with increase in pressure?
- Autocatalytic reactions are best carried out in a__________?
- Cold shot cooling is only practical when the feed temperature is __________ than the reaction temperature?
- The rate constant of a reaction is a function of the __________?
- The vessel dispersion number (D/μL) for plug flow is__________?