Description : Pick out the wrong statement. (A) A catalyst does not alter the final position of equilibrium in a reversible reaction (B) A catalyst initiates a reaction (C) A catalyst is specific in reaction (D) A catalyst remains unchanged in chemical composition at the end the reaction
Last Answer : (B) A catalyst initiates a reaction
Description : For a heterogeneous catalytic reaction (A) Free energy of activation is lowered in the presence of catalyst, which remains unchanged at the end of reaction (B) A relatively small amount of catalyst ... with the reactant (D) The surface of the catalyst does not play an important role during reaction
Last Answer : (A) Free energy of activation is lowered in the presence of catalyst, which remains unchanged at the end of reaction
Description : A catalyst (A) Initiates a reaction (B) Lowers the activation energy of reacting molecules (C) Is capable of reacting with any one of the reactants (D) Cannot be recovered chemically unchanged at the end of a chemical reaction
Last Answer : (C) Is capable of reacting with any one of the reactants
Description : Pick out the correct statement. (A) In catalytic reactions, the catalyst reacts with the reactants (B) A catalyst initiates a chemical reaction (C) A catalyst lowers the activation energy of ... molecules (D) A catalyst cannot be recovered chemically unchanged at the end of the chemical reaction
Last Answer : (C) A catalyst lowers the activation energy of the reacting molecules
Description : Bulk diffusion in catalyst pore __________ with increase in pressure. (A) Increases (B) Decreases (C) Remains unchanged (D) Increases exponentially
Last Answer : (B) Decreases
Description : An aqueous solution of methanol is to be distilled in a tray column. High pressure steam is available as a source of heat. For a given reflux ratio and overhead composition, two options are ... (D) More number of trays are required and the residue composition is more dilute in methano
Last Answer : (A) Less number of trays are required
Description : With increase in temperature, the thermal conductivity of fresh lubricating oil (A) Increases (B) Decreases (C) Remains unchanged (D) May increase or decrease; depends on its composition
Description : Fractional conversion __________ for an exothermic reversible chemical reaction, when the temperature is maximum. (A) Increases (B) Remains unchanged (C) Decreases (D) Unpredictable from the data
Last Answer : (C) Decreases
Description : Pick out the wrong statement. (A) Use of different catalysts in a reversible catalytic chemical reaction does not change the equilibrium composition (B) Alumina is added as a promoter to ... Arrhenius plot (D) Presence of inerts affects the equilibrium conversion of reactants in a chemical reaction
Last Answer : (C) Activation energy for a reaction is obtained from the intercept of the Arrhenius plot
Description : What is the quantity that remains unchanged in a transformer?
Last Answer : Frequency
Description : If the demand for an item is trebled and the order cost is reduced to one third, then the economic order quantity (A) Is trebled (B) Remains unchanged (C) Decreases by a factor of 3 (D) Decreases by a factor of 1/3
Last Answer : (B) Remains unchanged
Description : It is important to balance the chemical equations to satisfy the law of conservation of mass. Which of the following statements of the law is incorrect? (a) The total mass of the elements present in ... the reaction (d) Mass can neither be created nor can it be destroyed in a chemical Reaction.
Last Answer : Answer : (c) The chemical composition of the reactants is the same before and after the reaction
Description : For a solid catalysed chemical reaction, the effectiveness of solid catalyst depends upon the __________ adsorption. (A) Physical (B) Chemical (C) Both (A) and (B) (D) Neither (A) nor (B)
Last Answer : (B) Chemical
Description : Fractional conversion __________ with increase in pressure for ammonia synthesis reaction i.e., N2 + 3H2 ⇌ 2NH3 . (A) Increases (B) Decreases (C) Remains unchanged (D) Unpredictable from the data
Last Answer : (A) Increases
Description : Pick out the correct statement. (A) A catalyst speeds up the forward reaction but slows shown the reverse reaction (B) Addition of catalyst changes the equilibrium constant (C) Pressure changes do not change the equilibrium concentrations (D) The composition of equilibrium is changed by catalyst
Last Answer : (C) Pressure changes do not change the equilibrium concentrations
Description : A distillation column with N plates is being operated under normal conditions. At some point of time, the operation is shifted to total reflux condition (i.e., no product and residue are ... and without total reflux (D) The top and bottom compositions correspond to the maximum enrichment available
Last Answer : (D) The top and bottom compositions correspond to the maximum enrichment available
Description : In multistage equilibrium conversion of SO2 to SO3 (2SO2 + O2 ⇌ 2SO3 ), the reverse reaction becomes appreciable at a temperature of 550° C. The percentage equilibrium conversion of SO2 to ... some quantity of SO3 during intermediate stage (D) Maintaining low temperature & pressure in the converter
Last Answer : (C) Removing some quantity of SO3 during intermediate stage
Description : The chemical reaction at one time the rate of forward and backward reaction becomes equal that state is called Equilibrium state. In a chemical equilibrium, the following properties remain unchanged with time. Pressure, Temperature, density, color Pressure, Temperature, density, color
Last Answer : Who proposed law of mass action ?
Description : Assertion :- `Q_("Surr")` is zero for adiabatic process Reason :- Final state of the system remains unchanged in adiabatic process.
Last Answer : Assertion :- `Q_("Surr")` is zero for adiabatic process Reason :- Final state of the system ... False. D. If both Assertion & Reason are false.
Description : The body protein after eighteen years (A) Remains unchanged (B) Is decomposed only slightly at intervals of one month (C) Is in a constant state of flux (D) Is used only for energy requirement
Last Answer : Answer : C
Description : In a ferromagnetic material the state of flux density is as follows when external magnetic field is applied to it. (A) Increased (B) Decreased (C) Remains unchanged (D) Becomes zero
Last Answer : (C) Remains unchanged
Description : The basic difference between vegetable oils and fats is in their (A) Density (B) Chemical properties (C) Physical state (D) Composition
Last Answer : (C) Physical state
Description : Vegetable oils and fats basically differ in their (A) Density ranges (B) Physical state (C) Chemical composition (D) Chemical properties
Last Answer : (B) Physical state
Description : With increasing bond order, stability of a bond (a) Decreases (b) Increases (c) Remains unchanged (d) None of these
Last Answer : Ans:(b)
Description : In the impact problems the following conditions must always be satisfied a.The total kinetic energy remains unchanged b.The total linear momentum remains unchanged c.The magnitude of the total linear ... is reduced by a factor proportional to the coefficient of restitution e.None of the above
Last Answer : b. The total linear momentum remains unchanged
Description : If a radioactive sample has decayed until only one eighth of the original sample remains unchanged how many half-lives have elapsed?
Last Answer : 3
Description : The rating of the Transformer __ when the supply frequency is increased: a) Remains unchanged b) Increases c) Decreases d) None of the above
Last Answer : Ans: B
Description : As the amount of clay in a soil increases, its water retaining capacity _____ 30 A. Increases B. Decreases C. Remains unchanged D. None of Above
Last Answer : ANSWER: A
Description : When price of a substitute of commodity falls, the demand for - (1) falls (2) remains unchanged (3) increases at increasing rate (4) rises
Last Answer : (1) falls Explanation: Cross Price Effect refers to effect on the demand for a given commodity due to a change in the price of a substitute commodity. A change (increase or decrease) in the ... the given commodity (tea) also decreases. It shifts the demand curve of the given commodity towards left.
Description : In the periodic table of elements, on moving from left to right across a period, the atomic radius – (1) decreases (2) increases (3) remains unchanged (4) does not follow a definite pattern
Last Answer : (1) decreases Explanation: The atomic radius is the distance from the atomic nucleus to the outermost stable electron orbital in an atom that is at equilibrium. It tends to decrease across a period from ... usually increases while going down a group due to the addition of a new energy level (shell).
Description : During electrical desalting of crude oil, the electrical conductivity of a mixture of crude oil and water (which ranges between 3 to 8% water) __________ with increase in the amount of water. (A) Decreases (B) Increases (C) Remains unchanged (D) Decreases linearly
Last Answer : (B) Increases
Description : Production rate __________ with increased fineness, with a given energy input to the size reduction machine. (A) Decreases (B) Increases (C) Remains unchanged (D) May increase or decrease; depends on the machine
Last Answer : (A) Decreases
Description : With increase in the capacity of screens, the screen effectiveness (A) Remains unchanged (B) Increases (C) Decreases (D) Decreases exponentially
Description : As the impurities are oxidised, the melting point of iron (A) Decreases (B) Remains unchanged (C) Increases (D) May increase or decrease; unpredictable
Last Answer : (C) Increases
Description : With increase in absolute humidity, the dew point of an unsaturated mixture of air and water vapor (at constant pressure and temperature). (A) Increases (B) Remains unchanged (C) Decreases (D) Decreases linearly
Description : In a counter-current extractor, as the axial mixing increases, the extraction efficiency (A) Increases (B) Decreases (C) Remains unchanged (D) Depends on the pressure of the system
Description : If the amount of the steam used in steam distillation is increased, the temperature of distillation (A) Increases (B) Decreases (C) Remains unchanged (D) Depends on relative volatility
Description : With increase in the concentration of the adsorbate, the integral heat of adsorption (A) Increases (B) Decreases (C) Remains unchanged (D) May increase or decrease; depends on the type of adsorbate
Description : At a given equilibrium pressure, with increase in temperature, the concentration of adsorbed gas on solid adsorbent (A) Increases (B) Decreases (C) Remains unchanged (D) Increases exponentially
Description : The feed to fractionating column is changed from saturated vapour to saturated liquid. If the separation and reflux ratio remains unchanged, the number of ideal stages will (A) Increase (B) Decrease (C) Remain same (D) Depend on saturated boiling point; may increase or decrease
Last Answer : (A) Increase
Description : With increase in temperature, the mutual solubility of two liquids (A) Increases (B) Decreases (C) Remains unchanged (D) Decreases exponentially
Description : In extraction, as the temperature increases, the area of heterogeneity (area covered by binodal curve) (A) Decreases (B) Increases (C) Remains unchanged (D) None of these
Description : The boiling points of pure components of a binary system __________ with increase in total pressure of the system. (A) Decreases (B) Increases (C) Remains unchanged (D) May increase or decrease, depends on the system
Description : With increase in the liquid flow rate at a fixed gas velocity in a randomly packed counter current gas-liquid absorption column, the gas pressure drop (A) Decreases (B) Remains unchanged (C) Increases (D) Decreases exponentially
Description : With increase in temperature, the thermal conductivity of steel (A) Increases (B) Decreases (C) Remains unchanged (D) Increases exponentially
Description : For gases, the thermal conductivity increases with temperature rise. For liquids, with increase in concentration, its thermal conductivity generally (A) Decreases (B) Increases (C) Remains unchanged (D) Increases exponentially
Description : With the increase of temperature, the Col-burn jH factor (A) Increases (B) Decreases (C) Remains unchanged (D) May increase or decrease; depending on temperature
Description : Thermal conductivities of most of the liquids __________ with rise in temperature. (A) Increases (B) Decreases (C) Remains unchanged (D) May increase or decrease; depends on the liquid
Description : If the baffle spacing in a shell and tube heat exchanger increases, then the Reynolds number of the shell side fluid (A) Remains unchanged (B) Increases (C) Increases or decreases depending on number of shell passes (D) Decreases
Last Answer : (D) Decreases
Description : With increase in porosity, the thermal conductivity of a solid substance (A) Increases (B) Decreases (C) Remains unchanged (D) May increase or decrease; depends on the solid