ECAT Chemistry Online Test With Answers

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ECAT Chemistry Online Test

Sr. # Questions Answers Choice
1 The process in which water molecules surround solute particles is called Hydration Salvation Hydrolysis Dehydration
2 The process in which the solvent molecules are surrounded and interact with solute ions or molecules is called Solvation Hydration Hydrogenation None
3 Solution may have units Molarity Molality Mole fraction All of them
4 Number of moles of solute dissolved in 1 Kg of solvent is knowns as Molarity Formality Molality Mole fraction
5 Number of moles of the solute dissolved per dm3of the solution is knows as Molarity Formality %age None of these
6 A solution can be Dilute and concentrated Saturated and dilute Saturated and unsaturated Supersaturated and saturated
7 A homogeneous mixture of two or more than two chemical substances is called Solute Solution Solvent Salvation
8 -778.9 KJ 788.0 KJ -1.9 KJ +1.9 KJ
9 The entropy of the universe Constant Is equal to zero Decreasing Increasing
10 Kinetic energy of the molecules is due to Transnational motion Rotational motion Vibrational motion All of these
11 The heat released is enthalpy of neutralization The heat released is enthalpy of atomization The heat released is enthalpy of sublimation The heat released is enthalpy of formation
12 -110.7 KJ/mole +110.7 KH mole<sup>-1</sup> 676.7 KJ mole<sup>-1</sup> +393.7 KH mole<sup>-1</sup>
13 The condition for standard enthalpy change is 1 atm 30°C 1 atm 50°C 1 atm 25°C 760 atm 25°C
14 Heat,. work and internal energy of the system and surroundings are related into an equation which is called First law of thermodynamics Hess's law Henry's law Born-haber cycle
15 For a given process the heat change at constant pressure qpis related to the heat change at constant volume (qv) according to q<sub>p</sub>= q<sub>v</sub> q<sub>p</sub>&lt; q<sub>v</sub> q<sub>p</sub>&gt; q<sub>v</sub> q<sub>p</sub>= qv/2
16 The measurement of degree of disorder is Internal energy Enthalpy Entropy None
17 A special application of the Hess's law to binary ionic compounds of M+X-type in calculation of their lattice energies is Enthalpy of reaction Born-haber cycle First law of thermodynamics Enthalpy of combustion
18 The net heat change in chemical reaction is same whether it is brought in two or more different ways in one or several steps. it is known as Henry's law Joule's principle Hess's law Law of conservation of energy
19 Glass calorimeter reaction is one which we measure Enthalpy of combustion Enthalpy of reaction Pressure volume work None of above
20 In endothermic reactions, the heat content of the Products is more than that of reactants Reactants is more than that of products Both a and b None of the above
21 Which of the following is directly related with entropy Pressure Degree of freedom Temperature Both b and c
22 Enthalpy of neutralization of all the strong acids and strong bases has the same value because Neutralization leads to the formation of salt and water Strong acids and bases are ionic substances Acid always give rise to H<sup>+</sup>ions and bases always furnish OH<sup>-</sup>ions The net chemical change involve the combination of H<sup>+</sup>and OH<sup>-</sup>ions to form water
23 When the degree of freedom increase the entropy ______ Decreases Increases Remains same All
24 For a given process, the heat changes at constant pressure (qp) and at constant volume (qv) are related to each other as q<sub>p</sub>= q<sub>v</sub> q<sub>p</sub>&lt; q<sub>v</sub> q<sub>p</sub>&lt; q<sub>v</sub> q<sub>p</sub>= qv/2
25 One calorie is equal 4.132 J 760 J 4.184 J 1 J
26 The change in heat energy at constant temperature is called Enthalpy change Heat of vaporisation Bond energy Internal energy change
27 Hear of reaction Heat of formation Heat of neutralization Heat of combustion
28 Which of the statement is contrary to the first law of thermodynamics Energy can neither be created nor destroyed One form of energy can be transferred into an equivalent amount of other kinds of energy In an adiabatic process the work done is independent of its path Continuous production of mechanical work without supplying an equivalent amount of heat is possible
29 The amount of heat evolved or absorbed in a chemical reaction indicated by balanced chemical equation at 25° and one atmospheric pressure is called Enthalpy of formation Enthalpy of neutralization Enthaply of combustion Enthaply of reaction
30 Quantity of heat evolved or absorbed during the reaction is measured according to the equation
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