Description : What is the effect of endothermic and exothermic reactions on temperature of surroundings.
Last Answer : Ans: In endothermic reactions heat is absorbed from the surroundings resulting in decrease of temperature. Whereas heat is evolved in surrounding during exothermic reaction so temperature of surroundings increases.
Description : On which factors heat content of a system depends?
Last Answer : Ans: Heat content (enthalpy of a reaction depends upon two factors I. Physical state of reactants II. Temperature
Description : Why a polystyrene cup is used instead of a glass beaker to find out heat of neutralization?
Last Answer : Ans: A polystyrene cup acts as an insulator therefore it will not allow heat to exchange between reaction mixture and its surroundings and enthalpy of reaction doesn’t change . On the other hand glass can easily transfer and exchange heat bringing change in enthalpy of reaction.
Description : What is the value of heat of neutralization when strong acid and base react?
Last Answer : Ans: The heat of neutralization is -57.32 kJ, when strong acid and base react.
Description : What are spectator ions?
Last Answer : During a neutralization reaction anion of acid and cation of base don’t take part in the reaction and remain in the solution .These ions are called spectater ions.
Description : Why enthalpy of water in liquid state (25 C) is less than the enthalpy of steam (100 C)?
Last Answer : Ans: Enthalpy of water in liquid state is less than steam because the steam is at high temperature i.e;100 C, whereas that of liquid water is 25 C.
Description : Define thermochemistry?
Last Answer : “The branch of chemistry in which we study the heat changes during chemical reactions is called ThermoChemistry”.
Description : All decomposition reaction are endothermic but decomposition of vegetable matter into compost is exothermic because (a) It is an oxidation reaction (b) decomposition done by microbes (c) releases heat energy (d) all the above
Last Answer : (d) all the above
Description : During decomposition, energy is absorbed in the form of heat, light or electricity for breaking down the reactants which is known as: (a) exothermic reaction (b) endothermic reaction (c) reduction reaction (d) oxidation
Last Answer : (b) endothermic reaction
Description : The Classical example of redox reaction is Combustion of fossil fuel. During combustion of fossil fuels, the carbon compound in the fossil fuel reacts with oxygen in the presence of a heat source to ... to react with oxygen, so the energy used in portion of combustion is an endothermic reaction.
Last Answer : Combustion of fossil fuel
Description : An endothermic second order reaction is carried out in an adiabatic plug flow reactor. The rate of heat generation is: (A) Maximum at the inlet of the reactor (B) Maximum at the exit of the reactor (C) Maximum at the centre of the reactor (D) Constant throughout the reactor
Last Answer : (A) Maximum at the inlet of the reactor
Description : Pick out the correct statement. (A) A chemical reaction accompanied by absorption of heat is called an exothermic reaction (B) A chemical reaction accompanied by evolution of heat is called an ... does not change on changing the concentration units (D) Chemical equilibrium state is dynamic in nature
Last Answer : (C) The rate constant for a first order reaction does not change on changing the concentration units
Description : Pick out the wrong statement. (A) Enthalpies of all elements in their standard states are assumed to be zero (B) Combustion reactions are never endothermic in nature (C) Heat of reaction ... to the change in internal energy (D) Clausius-Clapeyron equation is not applicable to melting process
Last Answer : (D) Clausius-Clapeyron equation is not applicable to melting process
Description : Endothermic refers to a process that w) does work x) gives off heat y) loses mass z) absorbs heat
Last Answer : ANSWER: Z -- ABSORBS HEAT
Description : A negative heat of solution indicates that: w) an endothermic dissolving process occurs x) solute solubility increases with rising solution temperature y) solute solubility decreases with rising solution temperature z) super-saturation conditions exist
Last Answer : ANSWER: Y -- SOLUTE SOLUBILITY DECREASES WITH RISING SOLUTION TEMPERATURE
Description : Combustion of a candle is a/an - (1) photochemical reaction (2) physical change (3) endothermic reaction (4) exothermic reaction
Last Answer : (4) exothermic reaction Explanation: In theory, a candle is made of a solid hydrocarbon called paraffin. When the solid burns, the hydrocarbon reacts with oxygen to form carbon dioxide and water. The reaction is exothermic, meaning it releases heat to the atmosphere along with the other products.
Description : The process of dissolving an acid or a base in water is a highly - (1) Exothermic reaction (2) Endothermic reaction (3) Sublimation reaction (4) Redux reaction
Last Answer : (1) Exothermic reaction Explanation: The process of dissolving an acid or a base in water is a highly exothermic one. This is why care must be taken while mixing concentrated nitric acid or sulphuric acid with water.
Description : Combustion of a candle is a/an (1) photochemical reaction (2) physical change (3) endothermic reaction (4) exothermic reaction
Last Answer : exothermic reaction
Description : Which of the following reaction is endothermic?
Last Answer : Which of the following reaction is endothermic? A. `CaCO_(3)(s)rarrCaO(s)+CO_(2)(g)` B. `Fe(s)+S(s)rarr FeS(s) ... D. `CH_(4)(g)+2O_(2)(g)+2H_(2)O(l)`
Description : Which of the following is an endothermic reaction?
Last Answer : Which of the following is an endothermic reaction? A. `2H_(2)(g)+O_(2)(g)rarr 2H_(2)O(l)` B. `N_(2)(g)+ ... 5)OH(aq)+3O_(2)(g)rarr 2CO_(2)+2H_(2)O(l)`
Description : At a certain temperature T, the endothermic reaction `A rarr B` proceeds almost to completion.The entropy change is :
Last Answer : At a certain temperature T, the endothermic reaction `A rarr B` proceeds almost to completion.The entropy ... `Delta S gt 0` D. Cannot be predicted
Description : The reaction `3O_(2(g)) rarr 2O_(3(g))` is endothermic. What can be concluded about the average per bond in `O_(2) and O_(3)` ?
Last Answer : The reaction `3O_(2(g)) rarr 2O_(3(g))` is endothermic. What can be concluded ... drawn about the average bond energies from this information alone
Description : Is caramelizing sugar a endothermic or exothermic reaction?
Last Answer : This is an endothermic reaction.
Description : Is a match is lit and Burns endothermic or exothermic reaction?
Last Answer : Need answer
Description : Is acid rain an exothermic or endothermic reaction?
Last Answer : No
Description : Name the endothermic reaction out of the following: (A) Catalytic cracking (B) Hydrocracking (C) Dehydrogeneration of Naphthene to produce aromatic (D) Catalytic polymerisation
Last Answer : (C) Dehydrogeneration of Naphthene to produce aromatic
Description : Cracking is (A) An exothermic reaction (B) An endothermic reaction (C) Favoured at very low temperature (D) None of these
Last Answer : (B) An endothermic reaction
Description : C6H12O6 (aq) + 602(aq) →6CO2(aq) + 6H2O The above reaction is a/an (a) displacement reaction (b) endothermic reaction (c) exothermic reaction (d) neutralisation reaction
Last Answer : Answer: (c)
Description : Pick out the wrong statement (A) Co-current absorbers are usually used, when the gas to be dissolved in the liquid is a pure substance (B) In case of gas absorption, HETP is ... reaction (D) In actual practice, absorption is an endothermic process, while stripping is an exothermic process
Last Answer : (D) In actual practice, absorption is an endothermic process, while stripping is an exothermic process
Description : What is an endothermic reaction?
Last Answer : A chemical reaction in which there is absorption of heat is called endothermic reaction. Ex: Dissolution of ammonium chloride, common salt and sugar in water, cooking of rice
Description : ENDOTHERMIC REACTION
Last Answer : ENDOTHERMIC REACTION: Reaction accompanied by absorption of eat are called Endothermic reaction. The reactants require heat to form products. Temperature of the solution falls.
Description : During photosynthesis, energy is absorbed by chlorophyll, therefore it is: (a) exothermic reaction (b) endothermic reaction (c) neither exothermic nor endothermic reaction (d) the process takes place in plants only
Description : Which of the following describes the given graph correctly? Potential energy Reaction Product Substrate B A (a) Endothermic reaction with energy A in presence of enzyme and B in absence of enzyme. (b) ... . (d) Exothermic reaction with energy A in absence of enzyme and B in presence of enzyme.
Last Answer : (b) Exothermic reaction with energy A in presence of enzyme and B in absence of enzyme
Description : The combustion reaction, C + O2 = CO2 , is (A) Exothermic (B) Endothermic (C) Autocatalytic
Last Answer : (A) Exothermic
Description : Sometimes water is sprayed during coal charging in the coke oven, which helps in (A) Prevention of clinker formation in the oven (B) Controlling the dust nuisance while charging the coal (C) Reducing the cracking of hydrocarbons in ... represented by C + H2O = CO + H2 ) (D) All (A), (B) and (C)
Last Answer : (D) All (A), (B) and (C)
Description : When steam is passed over coal resulting in the endothermic reaction represent by, C + H2O = CO + H2 , it is called the __________ of coal. (A) Carbonisation (B) Oxidation (C) Coalification (D) Gasification
Last Answer : (D) Gasification
Description : The gasification reaction represented by, C + H2O = CO + H2 , is (A) Exothermic (B) Endothermic (C) Catalytic (D) Autocatalytic
Last Answer : (B) Endothermic
Description : Combustion reaction of fuels is a/an __________ reaction. (A) Auto catalytic (B) Exothermic (C) Endothermic (D) None of these
Last Answer : (B) Exothermic
Description : Formation of ammonium carbamate by reaction of NH3 with CO2 is a/an __________ reaction. (A) Catalytic (B) Exothermic (C) Endothermic (D) Reversible
Description : Pick out the correct statement. (A) Reaction of NH3 with HNO3 to produce (NH4 )2NO3 is endothermic (B) With increase in NH3 /CO2 ratio, urea yield decreases for a given temperature, pressure and total ... (an intermediate during urea manufacture) is toxic to seeds and animals (D) Both (B) and (C)
Last Answer : (B) With increase in NH3 /CO2 ratio, urea yield decreases for a given temperature, pressure and total feed rate
Description : Liquid ammonia and 60% nitric acid reaction (which producesammonium nitrate) is (A) Exothermic (B) Endothermic (C) Autocatalytic (D) None of these
Description : Dehydration of ammonium carbamate to yield urea is a/an __________ reaction. (A) Exothermic (B) Endothermic (C) Autocatalytic (D) Catalytic
Description : Dehydration of ammonium carbamate (to produce urea) is a/an __________ reaction. (A) Reversible (B) Catalytic (C) Exothermic (D) Endothermic
Last Answer : (D) Endothermic
Description : Neutralisation of nitric acid with ammonia to produce ammonium nitrate is a/an __________ reaction. (A) Catalytic (B) Endothermic (C) Exothermic (D) Autocatalytic
Last Answer : (C) Exothermic
Description : Ammonia synthesis reaction is (A) Exothermic (B) Endothermic (C) Autocatalytic (D) None of these
Description : Catalytic ammonia synthesis reaction as in Haber's process is (A) Endothermic (B) Exothermic (C) Irreversible (D) None of these
Description : Conversion increases with increase in temperature in case of a/an__________ reaction. (A) Autocatalytic (B) Irreversible (C) Reversible endothermic (D) Reversible exothermic
Last Answer : (C) Reversible endothermic
Description : With increase in temperature, the equilibrium __________ rises in case of endothermic reaction. (A) Constant (B) Conversion (C) Both (A) & (B) (D) Neither (A) nor (B)
Last Answer : (B) Conversion
Description : During manufacture of H2SO4 , the oxidation of SO2 to SO3 by oxygen is an endothermic reaction. The yield of SO3 will be maximised, if the (A) Temperature is increased (B) Pressure is reduced (C) Temperature is increased and pressure is reduced (D) Temperature is reduced and pressure is increased
Last Answer : (D) Temperature is reduced and pressure is increased