ECAT Chemistry Online Test With Answers

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ECAT Chemistry Online Test

Sr. # Questions Answers Choice
1 +712 KJ mol<sup>-1</sup> +492 KJ mol<sup>-1</sup> -932 KJ mol<sup>-1</sup> -960 KJ mol<sup>-1</sup>
2 -76 KJ -57 KJ -171 KJ -114 KJ
3 During a chemical reaction heat may be absorbed Evolved Both evolved and absorbed None of these
4 A system undergoes a change to attain the state of High energy Low energy Moderate energy None of these
5 ΔH for an endothermic reaction carries Positive sign Negative sign Both sign None of these
6 Energy can neither be created nor destroyed, although it can be transformed from one form to another. This is a statement of Law of conservation of matter Law of definite proportions Law of conservation of energy None of these
7 By applying Hess's law, we can calculate <i style="text-align: center;">Δ</i>H <i style="text-align: center;">Δ</i>S <i style="text-align: center;">Δ</i>F K
8 The amount of heat evolved or absorbed in a process in the same whether the process takes place in one or several steps is the statement of First law of thermodynamics Hess's law Coulomb's law Phase law
9 ΔH is equal to E + PV E + P<i style="text-align: center;">Δ</i>V <i style="text-align: center;">Δ</i>E + P <i style="text-align: center;">Δ</i>E + P<i style="text-align: center;">Δ</i>V
10 Which substances haveΔH =ΔE Solids Liquids Gases Liquids and solids
11 The mathematical form of fist law of thermodynamics is
12 The energy of the system and surrounding is conserved. This is a statement of Law of mass action Law of definite proportion Law of conservation of energy Second law of thermodynamics
13 Adding 2(ii) + 3(iii) and subtracting i Add i + ii + iii Add i - ii + iii Add i - ii - iii
14 Given data
(i) heat of formation of CO2is -393.7 KJ mole-1
(ii) heat of formation of H2O is -285.8 KH mole-1
(iii) heat of combustion of CH4 is -890.00 KJ mole-1
Enthalpy of formation of methane from C and H2is calculated by Hess's law by
 Adding i + ii + iii Adding 2(i) and ii and subtracting iii adding i + iii and subtracting ii Adding i + 2(ii) and subtracting iii
15 Given date
(i) heat of neutralization of HCl and NaOH is -57.3 KJ mole-1
(ii) heat of neutralization of CH3COOH with NaOH is 55.2 KJ mole-1
The enthalpy of ionization of CH3COOH is a determined according to Hess's law by
 Adding i and ii Dividing i by ii Subtracting i from ii Subtracting ii from i
16 Statement enthalpy of combustion of H2is -285.8 KJ mole-1then which is the standard enthalpy of formation of water +285.8 KH mole<sup>-1</sup> -285.5 KJ mole<sup>-1</sup> Zero -218 KJ mole<sup>-1</sup>
17 The amount of heat required to convert one mole of solid directly into its vapour state at STP is called as Molar heat of vaporization Standard heat of vaporization Heat of reaction Heat of neutralization
18 B-atom in BF3has sp<sup>3</sup>hybridization sp<sup>2</sup>hybridization sp hybridization no hybridization
19 Which of the following molecules have its central atom sp2hybridized CH<sub>4</sub> C<sub>2</sub>H<sub>2</sub> C<sub>2</sub>H<sub>4</sub> CCl<sub>4</sub>
20 Planar geometry of molecules is due to sp<sup>3</sup>hybridization sp<sup>2</sup>hybridization sp hybridization P - p overlap
21 Nitrogen in NH3is sp3hybridized but the bond angle in NH3is 107° and not 109.5° due to sp<sup>3</sup>orbital planar sp<sup>3</sup>orbital trigonal Repulsion between lone pair and bonded pairs None of them
22 The three N - Hσ-bonds are made by sp<sup>3</sup>- s overlap sp<sup>2</sup>- s overlap P - p overlap sp - overlap
23 Three sp2hybrid are co-planar at an angle of 104.5° 109.5° 107° 120°
24 During the formation of a chemical bond the potential energy of the system Decreases Increases Does not change None of these
25 The geometry of 4 sp3hybrid orbitals on an atom is Square planar Tetrahedral Trigonal planar Linear
26 Which of the following molecules have sp3hybridized carbon CH<sub>4</sub> C<sub>2</sub>H<sub>4</sub> C<sub>2</sub>H<sub>2</sub> CO<sub>2</sub>
27 Excitantion of an electron from 2s to 2p-orbital Transfer of three electrons from B to the other atoms Excitation of two electrons form 2s orbital to 2p orbital Formation of molecular ion
28 N-atom forms three covalent bonds, its electronic configuration is
29 In which of the following theories the hybridizationis considered Vsepr Lewis Molecule orbital Valence bond
30 In H2O molecule the bond angle is 90° 109.5° 107° 104.5°
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