Exercise 1

The enthalpy of burning of methane, graphite and dihydrogen at 298 K are, – 890.3 kJ mol–1 – 393.5 kJ mol–1 , and – 285.8 kJ mol–1 individually. Enthalpy of arrangement of CH4(g) will be (I) – 74.8 kJ mol–1 (ii) – 52.27 kJ mol–1 (iii) +74.8 kJ mol–1 (iv) +52.26 kJ mol–1 .

solution: As indicated by the inquiry,   Subsequently, the ideal condition is the one that addresses the development of CH4 (g) i.e., Enthalpy of arrangement of\[~CH4\left( g \right)\text{...

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Remark on every one of the accompanying perceptions: (a) The mobilities of the salt metal particles in fluid arrangement are Li+ < Na+ < K+ < Rb+ < Cs+ (b) Lithium is the main metal to frame a nitride straightforwardly. (c)

    \[E0\text{ }for\text{ }M2+\left( aq \right)\text{ }+\text{ }2e\to \text{ }M\left( s \right)\text{ }\left( where\text{ }M\text{ }=\text{ }Ca,\text{ }Sr\text{ }or\text{ }Ba \right)\]

is almost steady.

Solution: (a) The ionic and nuclear sizes of the metals will in general increment while going down the antacid gathering. The expanding request of the ionic sizes of the salt metal particles is as...

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An understudy neglected to add the response blend to the round lined cup at 27 °C however rather he/she set the flagon on the fire. After a pass of time, he understood his error, and utilizing a pyrometer he discovered the temperature of the carafe was 477 °C. What part of air would have been removed out?

solution: Leave the volume of the round lined cup alone V.   Then, at that point, the volume of air inside the cup at 27° C is V.   Presently, \[\begin{array}{*{35}{l}} ~  \\ V1\text{...

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The tension of 1 g of an ideal gas An at 27 °C is observed to be 2 bar. At the point when 2 g of one more ideal gas B is presented in a similar flagon at a similar temperature the strain becomes 3 bar. Discover a connection between their sub-atomic masses.

Solution: \[\begin{array}{*{35}{l}} Mass\text{ }of\text{ }gas\text{ }A\text{ },\text{ }WA~=\text{ }1g  \\ ~  \\ Mass\text{ }of\text{ }gas\text{ }B,~\text{ }WB~=\text{ }2g  \\ ~  \\ Tension\text{...

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The strain volume work for an ideal gas can be determined by utilizing the articulation w= ʃPexdv. The work can likewise be determined from the pV–a plot by utilizing the region under the bend inside as far as possible. At the point when an ideal gas is compacted (a) reversibly or (b) irreversibly from volume Vi to Vf. pick the right alternative.

    \[\begin{array}{*{35}{l}}    \left( I \right)\text{ }w\text{ }\left( reversible \right)\text{ }=\text{ }w\text{ }\left( irreversible \right)  \\    ~  \\    \left( ii \right)\text{ }w\text{ }\left( reversible \right)\text{ }<\text{ }w\text{ }\left( irreversible \right)  \\    ~  \\    \left( iii \right)\text{ }w\text{ }\left( reversible \right)\text{ }>\text{ }w\text{ }\left( irreversible \right)  \\    ~  \\    \left( iv \right)\text{ }w\text{ }\left( reversible \right)\text{ }=\text{ }w\text{ }\left( irreversible \right)\text{ }+\text{ }pex.V  \\ \end{array}\]

Arrangement:   Alternative (ii) is the appropriate response. w (reversible) < w (irreversible) Region under the bend is more noteworthy in irreversible pressure than that of reversible...

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An ideal gas is permitted to grow against a consistent strain of 2 bar from 10 L to 50 L in one stage. Compute the measure of work done by the gas. In the event that a similar development were done reversibly, will the work is done be higher or lower than the prior case?

    \[\left( Considering\text{ }that\text{ }1\text{ }L\text{ }bar\text{ }=\text{ }100J \right)\]

solution:   \[\begin{array}{*{35}{l}} Measure\text{ }of\text{ }work\text{ }done\text{ }=\text{ }-\text{ }pext\text{ }V  \\ ~  \\ =\text{ }\text{ }2\text{ }bar\text{ }\times \text{ }\left(...

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The net enthalpy change of a response is the measure of energy needed to break every one of the bonds in reactant atoms less the measure of energy needed to shape every one of the bonds in the item particles. What will be the enthalpy change for the accompanying response?

    \[H2\left( g \right)\text{ }+\text{ }Br2\left( g \right)\text{ }\to \text{ }2HBr\left( g \right)\]

Considering that Bond energy of H2, Br2 and HBr is 435 kJ mol–1, 192 kJ mol–1 and 368 kJ mol–1 separately.

solution:   For the response   \[H2\left( g \right)\text{ }+\text{ }Br2\left( g \right)\text{ }\to 2HBr\left( g \right)\] \[\begin{array}{*{35}{l}} Enthalpy\text{ }change  \\ ~  \\ =\text{...

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. Enthalpy is a broad property. As a rule, if the enthalpy of a general response A→B along one course is Δr H and Δr H1, ΔrH2, ΔrH3 … .. address enthalpies of middle responses prompting item B. What will be the connection between ΔrH for generally speaking response and ΔrH1, ΔrH2… .. and so forth for moderate responses.

solution:   For the response, A→B the development of B goes through a few middle of the road responses with various enthalpy esteems Δr H1, ΔrH2, ΔrH3… .., and the general enthalpy change is Δr...

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18.0 g of water totally vapourises at 100°C and 1 bar pressure and the enthalpy change in the process is 40.79 kJ mol–1. What will be the enthalpy change for vapourising two moles of water under similar conditions? What is the standard enthalpy of vapourisation for water?

solution:   Enthalpy change of vapourisation for \[1\text{ }mole\text{ }=\text{ }40.79\text{ }kJ\text{ }mol1\] enthalpy change of vapourisation for \[2\text{ }moles\text{ }of\text{ }water\text{...

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. Think about the accompanying response among zinc and oxygen and pick the right alternatives out of the choices given underneath :

    \[2\text{ }Zn\text{ }\left( s \right)\text{ }+\text{ }O2\text{ }\left( g \right)\text{ }\to \text{ }2\text{ }ZnO\text{ }\left( s \right)\text{ };\text{ }H\text{ }=\text{ }\text{ }693.8\text{ }kJ\text{ }mol1\]

(i) The enthalpy of two moles of ZnO is not exactly the absolute enthalpy of two moles of Zn and one mole of oxygen by 693.8 kJ. (ii) The enthalpy of two moles of ZnO is more than the absolute enthalpy of two moles of Zn and one mole of oxygen by 693.8 kJ. (iii) 693.8 kJ mol–1 energy is advanced in the response. (iv) 693.8 kJ mol–1 energy is caught up in the response.

solution:   Choice (I) and (iii) are the appropriate responses

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. For an optimal gas, crafted by reversible extension under isothermal condition can be determined by utilizing the articulation

    \[w\text{ }=\text{ }\text{ }nRT\text{ }ln\text{ }Vf/Vi\]

An example containing 1.0 mol of an ideal gas is extended isothermally and reversibly to multiple times of its unique volume, in two separate tests. The extension is completed at 300 K and 600 K separately. Pick the right alternative. (I) Work done at 600 K is multiple times the work done at 300 K. (ii) Work done at 300 K is double the work done at 600 K. (iii) Work done at 600 K is double the work done at 300 K. (iv) ∆U = 0 in the two cases.

solution:   Alternative (iii) and (iv) are the appropriate responses. work done at 600 K is double the work done at 300 K. Since each case includes isothermal extension of an optimal gas, there...

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The immediacy implies, having the capacity to continue without the help of an outer organization. The cycles which happen immediately are (I) stream of warmth from colder to hotter body. (ii) gas in a compartment contracting into one corner. (iii) gas extending to fill the accessible volume. (iv) consuming carbon in oxygen to give carbon dioxide.

solution:   Alternative (iii) and (iv) are the appropriate responses. Gas grows or diffuses in accessible space suddenly, e.g., spillage of cooking gas gives smell of ethyl mercaptan...

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. Thermodynamics essentially manages (I) interrelation of different types of energy and their change from one structure to another. (ii) energy changes in the cycles which rely just upon starting and last conditions of the minute frameworks containing a couple of particles. (iii) how and at what rate these energy changes are done. (iv) the framework in harmony state or moving from one balance state to another harmony state.

solution:   Alternative (I) and (iv) are the appropriate responses. Thermodynamics manages interrelation of different types of energy and their change into one another. It additionally manages...

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. Which of coming up next isn’t right? (I) ∆G is zero for a reversible response (ii) ∆G is positive for an unconstrained response (iii) ∆G is negative for an unconstrained response (iv) ∆G is positive for a non-unconstrained response

solution:   Alternative (ii) is the appropriate response.   ∆G gives a basis for suddenness at consistent strain and temperature.   (I) If ∆G is negative (< 0). the cycle is...

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The entropy change can be determined by utilizing the articulation

    \[S\text{ }=\text{ }qrev/T\]

At the point when water freezes in a glass container, pick the right assertion among the accompanying : (I) ∆S (framework) diminishes however ∆S (environmental factors) stays as before. (ii) ∆S (framework) increments yet ∆S (environmental elements) diminishes. (iii) ∆S (framework) diminishes yet ∆S (environmental elements) increments. (iv) ∆S (framework) diminishes and ∆S (environmental factors) likewise diminishes.

solution:   Alternative (iii) is the appropriate response. During the method involved with freezing energy is released,which is consumed by the environmental factors. Therefore,the entropy off...

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In an adiabatic interaction, no exchange of warmth happens among framework and environmental elements. Pick the right choice with the expectation of complimentary extension of an optimal gas under adiabatic condition from the accompanying.

    \[\begin{array}{*{35}{l}}    \left( I \right)\text{ }q\text{ }=\text{ }0,\text{ }T\text{ }\ne \text{ }0,\text{ }w\text{ }=\text{ }0  \\    ~  \\    \left( ii \right)\text{ }q\text{ }\ne \text{ }0,\text{ }T\text{ }=\text{ }0,\text{ }w\text{ }=\text{ }0  \\    ~  \\    \left( iii \right)\text{ }q\text{ }=\text{ }0,\text{ }T\text{ }=\text{ }0,\text{ }w\text{ }=\text{ }0  \\    ~  \\    \left( iv \right)\text{ }q\text{ }=\text{ }0,\text{ }T\text{ }<\text{ }0,\text{ }w\text{ }\ne \text{ }0  \\ \end{array}\]

solution:   Choice (iii) is the appropriate response. With the expectation of complimentary extension w = 0 For adiabatic cycle q = 0 From first law of thermodynamics,  ...

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Which of the accompanying assertions is right? (I) The presence of responding species in a covered measuring utencil is an illustration of an open framework. (ii) There is a trade of energy just as a matter between the framework also, the environmental elements in a shut framework. (iii) The presence of reactants in a shut vessel made down of copper is an illustration of a shut framework. (iv) The presence of reactants in a canteen jar or some other shut protected vessel is an illustration of a shut framework.

solution: Alternative (iii) is the appropriate response. For a shut vessel made down of copper, regardless of can be traded between the framework and the environmental elements however energy trade...

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A sulphate salt of Group 2 element of the Periodic Table is a white, soft substance, which can be molded into different shapes by making its dough. When this compound is left in the open for some time, it becomes a solid mass and cannot be used for molding purposes. Identify the sulphate salt, and why does it show such behavior? Give the reaction involved.

Plaster of Paris is calcium sulphate which is white in colour and has soft texture. 2. Gypsum is a hard compound which is used for molding purposes and is formed when Plaster of Paris is left open...

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A dry pellet of a common base B, when kept in the open absorbs moisture and turns sticky. The compound is also a by-product of the chloralkali process. Identify B. What type of reaction occurs when B is treated with an acidic oxide? Write a balanced chemical equation for one such solution.

Identification: B – Sodium Hydroxide(NaOH) Neutralization process occurs when sodium hydroxide reacts with acidic oxide. 2NaOH+ CO2 →Na2CO3+ H2O

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In one of the industrial processes used for the manufacture of sodium hydroxide, a gas X is formed as a by-product. The gas X reacts with lime water to give a compound Y which is used as a bleaching agent in the chemical industry. Identify X and Y, giving the chemical equation of the reactions involved.

Identification: X = Chlorine Y = Bleaching powder Reaction Involved: Ca(OH)2 (s) + Cl2 (g) →  CaOCl2 (s) + H2O — Calcium oxychloride (bleaching powder)

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A milkman is exceptionally disturbed one morning as his cow won’t give any milk. The milkman’s significant other gets the calf from the shed. On stroking by the calf, the cow gave adequate milk. Depict the job of endocrine organ and pathway related with this reaction?

solution: Oxytocin chemical is the chemical which animates the arrival of milk from the mammary organ by causing encompassing cells to contract. At the point when the baby begins taking care of...

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On an instructive excursion to Uttaranchal, Ketki and her companions see that numerous neighborhood individuals were having enlarged necks. Kindly assistance Ketki and her companions to discover the answers for the accompanying inquiries.

a. Which likely infection are these individuals experiencing? b. How could it be caused? c. What impact does this condition have on pregnancy? solution: a. Goiter. This is because of the...

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A patient whines of consistent thirst, unnecessary passing of pee and low pulse. At the point when the specialist checked the patients’ blood glucose and blood insulin level, the level was typical or somewhat low. The specialist analyzed the condition as diabetes stale us. However, he chose to gauge another chemical in patients blood. Which chemical does the specialist mean to quantify?

solution; Specialist plans to quantify vasopressin chemical since this chemical builds the reabsorption of water by the kidney and inadequacy of this chemical abatements reabsorption of water

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Mary is going to confront a meeting. In any case, during the initial five minutes prior to the meeting, she encounters perspiring, expanded pace of heartbeat ,breath and so forth which of the accompanying chemical are capable for her anxiety?

a. Estrogen and progesterone b. Oxytocin and vasopressin c. Adrenaline and noradrenaline d. Insulin and glucagon solution: Choice (c) is the appropriate response.

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Cyanobacteria and heterotrophic microbes have been clubbed together in Eubacteria of realm Monera according to the “Five Kingdom Classification” despite the fact that the two are boundlessly unique in relation to one another. Is this gathering of the two kinds of taxa in a similar realm supported? Provided that this is true, why?

solution: Cyanobacteria combination their food and they are autotrophic. Heterotrophic microbes rely upon different living beings for their food. Both Cyanobacteria and heterotrophic microscopic...

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Neurospora – an ascomycetes parasite has been utilized as an organic instrument to comprehend the system of plant hereditary qualities much similarly as Drosophila has been utilized to examine creature hereditary qualities. What makes Neurospora so exceptionally significant as a hereditary device?

solution: Neurospora is utilized as a hereditary instrument on the grounds that Quickest developing in vitro can be filled in negligible media. • Due to its haploid nature it can communicate both...

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There is a fantasy that following weighty downpours in woodland, mushrooms show up in huge number and make an extremely enormous ring or circle, which might be a few meters in breadth. These are called ‘Pixie rings’. Would you be able to clarify this fantasy of pixie rings in natural terms?

solution: This normally happening ring or curve of mushrooms, happening as a typical turf sickness, is distinguished as enormous dead rings or curve of grass in yards throughout the spring or summer...

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An infection is considered as a living life form and a commit parasite when inside a host cell. Be that as it may, the infection isn’t characterized alongside microscopic organisms or parasites. What are the characters of the infection that are like non-living items?

solution: Infections have no total cell structure.Try not to show development, division, digestion and need breath.High explicit gravityTry not to follow Robert Koch's proposeCan't be become under...

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