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MCQOPTIONS
This section includes 11242 Mcqs, each offering curated multiple-choice questions to sharpen your Joint Entrance Exam - Main (JEE Main) knowledge and support exam preparation. Choose a topic below to get started.
| 5301. |
Which is the best definition of ?heat of neutralization? [CMC Vellore 1991] |
| A. | The heat set free when one gram molecule of a base is neutralized by one gram molecule of an acid in dilute solution at a stated temperature |
| B. | The heat absorbed when one gram molecule of an acid is neutralized by one gram molecule of a base in dilute solution at a stated temperature |
| C. | The heat set free or absorbed when one gram atom of an acid is neutralized by one gram atom of a base at a stated temperature |
| D. | The heat set free or absorbed when a normal solution containing one gram equivalent of an acid is neutralized by a normal solution containing one gram equivalent of a base at a stated temperature |
| E. | The heat set free when one gram equivalent of an acid is neutralized by one gram equivalent of a base in dilute solution at a stated temperature |
| Answer» F. | |
| 5302. |
Enthalpy of a compound is equal to its [CMC Vellore 1991] |
| A. | Heat of combustion |
| B. | Heat of formation |
| C. | Heat of reaction |
| D. | Heat of solution |
| E. | Heat of dilution |
| Answer» D. Heat of solution | |
| 5303. |
A solution of \[500ml\] of \[0.2\,M\,KOH\] and \[500\,ml\] of \[0.2\,M\,HCl\] is mixed and stirred; the rise in temperature is \[{{T}_{1}}\]. The experiment is repeated using \[250\,ml\] each of solution, the temperature raised is \[{{T}_{2}}\]. Which of the following is true [EAMCET 1987; MP PET 1994] |
| A. | \[{{T}_{1}}={{T}_{2}}\] |
| B. | \[{{T}_{1}}=2{{T}_{2}}\] |
| C. | \[{{T}_{1}}=4{{T}_{2}}\] |
| D. | \[{{T}_{2}}=9{{T}_{1}}\] |
| Answer» B. \[{{T}_{1}}=2{{T}_{2}}\] | |
| 5304. |
The heat of neutralisation of a strong acid and a strong alkali is \[57.0\,kJ\,mo{{l}^{-1}}\]. The heat released when \[0.5\,mole\] of \[HN{{O}_{3}}\] solution is mixed with \[0.2\,mole\] of \[KOH\] is [KCET 1991; AIIMS 2002; AMU (Engg.) 2002] |
| A. | \[57.0\,kJ\] |
| B. | \[11.4\,kJ\] |
| C. | \[28.5\,kJ\] |
| D. | \[34.9\,kJ\] |
| Answer» C. \[28.5\,kJ\] | |
| 5305. |
The heat of combustion of carbon is ?94 kcal at 1 atm pressure. The intrinsic energy of \[C{{O}_{2}}\] is |
| A. | \[+94\,kcal\] |
| B. | \[-\,94\,kcal\] |
| C. | \[+47\,kcal\] |
| D. | \[-47\,kcal\] |
| Answer» C. \[+47\,kcal\] | |
| 5306. |
Which of the following fuels will have the highest calorific value (kJ/kg) [MP PMT 1990] |
| A. | Charcoal |
| B. | Kerosene |
| C. | Wood |
| D. | Dung |
| Answer» C. Wood | |
| 5307. |
The heat of formation of \[{{H}_{2}}O(l)\] is ? 68.0 kcal, the heat of formation of \[{{H}_{2}}O(g)\] is likely to be |
| A. | ? 68.0 kcal |
| B. | ? 67.4 kcal |
| C. | 80.0 kcal |
| D. | ? 58.3 kcal |
| Answer» C. 80.0 kcal | |
| 5308. |
The heat change \[\Delta H\] for the reaction \[2CO+{{O}_{2}}\to 2C{{O}_{2}};\,\Delta H=-135\,kcal\] is called |
| A. | Heat of formation |
| B. | Heat of reaction |
| C. | Heat of combustion |
| D. | Heat of solution |
| Answer» D. Heat of solution | |
| 5309. |
The heats of combustion of rhombic and monoclinic sulphur are respectively 70960 and 71030 calories. What will be the heat of conversion of rhombic sulphur to monoclinic [MP PMT/PET 1988] |
| A. | 70960 calories |
| B. | 71030 calories |
| C. | ? 70 calories |
| D. | + 70 calories |
| Answer» D. + 70 calories | |
| 5310. |
The heat change for the reaction \[{{H}_{2}}+\frac{1}{2}{{O}_{2}}\to {{H}_{2}}O\] is called |
| A. | Heat of reaction |
| B. | Heat of formation |
| C. | Heat of vaporisation |
| D. | None of the above |
| Answer» C. Heat of vaporisation | |
| 5311. |
In which of the following neutralisation reactions, the heat of neutralisation will be highest [MP PMT 1989, 91; AIIMS 1999] |
| A. | \[N{{H}_{4}}OH\] and \[C{{H}_{3}}COOH\] |
| B. | \[N{{H}_{4}}OH\] and \[HCl\] |
| C. | \[NaOH\] and \[C{{H}_{3}}COOH\] |
| D. | \[NaOH\] and \[HCl\] |
| Answer» E. | |
| 5312. |
Heat of combustion of a substance [CPMT 1987, 96; AFMC 1992] |
| A. | Is always positive |
| B. | Is always negative |
| C. | Is equal to heat of formation |
| D. | Nothing can be said without reaction |
| Answer» C. Is equal to heat of formation | |
| 5313. |
Which of the following reaction is endothermic [AFMC 1988] |
| A. | \[CaC{{O}_{3}}\to CaO+C{{O}_{2}}\] |
| B. | \[Fe+S\to FeS\] |
| C. | \[NaOH+HCl\to NaCl+{{H}_{2}}O\] |
| D. | \[C{{H}_{4}}+2{{O}_{2}}\to C{{O}_{2}}+2{{H}_{2}}O\] |
| Answer» B. \[Fe+S\to FeS\] | |
| 5314. |
In the reaction \[C{{O}_{2}}(g)+{{H}_{2}}(g)\to CO(g)+{{H}_{2}}O(g);\,\Delta H=80\,kJ\] \[\Delta H\] is known as [CPMT 1987; KCET 1993; Bihar CEE 1995] |
| A. | Heat of formation |
| B. | Heat of combustion |
| C. | Heat of neutralization |
| D. | Heat of reaction |
| Answer» E. | |
| 5315. |
The standard molar heat of formation of ethane, \[C{{O}_{2}}\] and water (l) are respectively ? 21.1, ? 94.1 and ? 68.3 kcal. The standard molar heat of combustion of ethane will be [IIT JEE 1986; DPMT 2005] |
| A. | ? 372 kcal |
| B. | 162 kcal |
| C. | ?240 kcal |
| D. | 183.5 kcal |
| Answer» B. 162 kcal | |
| 5316. |
Heat of neutralisation of an acid by a base is highest when [KCET 1985] |
| A. | Both the acid and base are weak |
| B. | Both the acid and base are strong |
| C. | The acid is strong and the base is weak |
| D. | The acid is weak and the base is strong |
| Answer» C. The acid is strong and the base is weak | |
| 5317. |
Heat of neutralisation of a strong acid by a strong base is a constant value because [KCET 1984] |
| A. | Salt formed does not hydrolyse |
| B. | Only \[{{H}^{+}}\] and \[O{{H}^{-}}\] ions react in every case |
| C. | The strong base and strong acid react completely |
| D. | The strong base and strong acid react in aqueous solution |
| Answer» C. The strong base and strong acid react completely | |
| 5318. |
Heat of formation of \[C{{O}_{2}}(g),\,\,{{H}_{2}}O(l)\] and \[C{{H}_{4}}(g)\] are ? 94.0, ? 68.4 and ? 17.9 kcal respectively. The heat of combustion of methane is |
| A. | ? 212.9 kcal |
| B. | ? 136.8 kcal |
| C. | ? 304.3 kcal |
| D. | ? 105.2 kcal |
| Answer» B. ? 136.8 kcal | |
| 5319. |
The heat of reaction does not depend upon |
| A. | Temperature of the reaction |
| B. | Physical state of reactants and products |
| C. | Whether the reaction is carried out at constant pressure or at constant volume |
| D. | The method by which the final products are obtained from the reactants |
| Answer» E. | |
| 5320. |
Heat of combustion \[\Delta H\] of \[C{{H}_{4}},\,{{C}_{2}}{{H}_{6}},\,{{C}_{2}}{{H}_{4}}\] and \[{{C}_{2}}{{H}_{2}}\] gases are ? 212.8, ? 373.0, ? 337.0 and ? 310.5 kcal respectively at the same temperature. The best fuel among these gases is |
| A. | \[C{{H}_{4}}\] |
| B. | \[{{C}_{2}}{{H}_{6}}\] |
| C. | \[{{C}_{2}}{{H}_{4}}\] |
| D. | \[{{C}_{2}}{{H}_{2}}\] |
| Answer» B. \[{{C}_{2}}{{H}_{6}}\] | |
| 5321. |
Heat of neutralisation of \[N{{H}_{4}}OH\] and \[HCl\] is [EAMCET 1980; Roorkee 1990; MP PMT 1994] |
| A. | \[13.7\,kcal\] |
| B. | \[>\,13.7\,kcal\] |
| C. | \[<\,13.7\,kcal\] |
| D. | None of the above |
| Answer» D. None of the above | |
| 5322. |
The enthalpy of fusion of ice per mole |
| A. | 18 kJ |
| B. | 8 kJ |
| C. | 80 kJ |
| D. | 6 kJ |
| Answer» E. | |
| 5323. |
The enthalpy of combustion at 25°C of H2, cyclohexane (C6H12) and cyclohexene (C6H10) are ?241, ?3920 and ?800 KJ / mole respectively. The heat of hydrogenation of cyclohexene is [BHU 2005] |
| A. | ? 121 KJ / mole |
| B. | + 121 KJ / mole |
| C. | ? 242 KJ / mole |
| D. | + 242 KJ / mole |
| Answer» B. + 121 KJ / mole | |
| 5324. |
The heat of formations of \[CO(g)\] and \[C{{O}_{2}}(g)\] are \[-26.4\] kcal and \[-94.0\] kcal respectively. The heat of combustion of carbon monoxide will be [MP PET/PMT 1988; EAMCET 1993] |
| A. | \[+26.4\,kcal\] |
| B. | \[-67.6\,kcal\] |
| C. | \[-120.6\,kcal\] |
| D. | \[+52.8\,kcal\] |
| Answer» C. \[-120.6\,kcal\] | |
| 5325. |
The mutual heat of neutralisation of 40 gm of \[NaOH\] and 60 gm \[C{{H}_{3}}COOH\] will be [MP PET/PMT 1988] |
| A. | 56.1 kcal |
| B. | Less than 56.1 kcal |
| C. | More than 56.1 kcal |
| D. | 13.7 kcal |
| Answer» C. More than 56.1 kcal | |
| 5326. |
Conversion of oxygen to ozone represented by the equation \[3{{O}_{2}}\to 2{{O}_{3}}\] is an endothermic reaction. Enthalpy change \[\Delta H\] accompanying the reaction [KCET 1988, 92] |
| A. | Is negative |
| B. | Is positive |
| C. | Is zero |
| D. | Depends on temperature |
| Answer» C. Is zero | |
| 5327. |
The enthalpy of neutralization is about 57.3 kJ for the pair |
| A. | \[HCl\] and \[N{{H}_{4}}OH\] |
| B. | \[N{{H}_{4}}OH\] and \[HN{{O}_{3}}\] |
| C. | \[HCl\] and \[NaOH\] |
| D. | \[C{{H}_{3}}COOH\] and \[NaOH\] |
| Answer» D. \[C{{H}_{3}}COOH\] and \[NaOH\] | |
| 5328. |
Given that \[2C(s)+2{{O}_{2}}(g)\to 2C{{O}_{2}}(g);\,\,\Delta H=-787\,kJ\] \[{{H}_{2}}(g)+\frac{1}{2}{{O}_{2}}(g)\to {{H}_{2}}O(l);\,\,\Delta H=-286\,kJ\] \[{{C}_{2}}{{H}_{2}}(g)+2\frac{1}{2}{{O}_{2}}(g)\to 2C{{O}_{2}}(g)+{{H}_{2}}O(l);\,\Delta H=-1301\,kJ\] Heat of formation of acetylene is [KCET 1989; Orissa JEE 2005] |
| A. | \[-\,1802\,kJ\] |
| B. | \[+\,1802\,kJ\] |
| C. | \[-800\,kJ\] |
| D. | \[+228\,kJ\] |
| Answer» E. | |
| 5329. |
Enthalpy change for reaction, \[\frac{1}{2}{{H}_{2}}+\frac{1}{2}C{{l}_{2}}\to HCl\], is called |
| A. | Enthalpy of combination |
| B. | Enthalpy of reaction |
| C. | Enthalpy of formation |
| D. | Enthalpy of fusion |
| Answer» D. Enthalpy of fusion | |
| 5330. |
If the enthalpy of B is greater than of A, the reaction \[A\to B\] is [MP PMT 1997] |
| A. | Endothermic |
| B. | Exothermic |
| C. | Instantaneous |
| D. | Spontaneous |
| Answer» B. Exothermic | |
| 5331. |
Which of the following is an example of endothermic reaction [MP PMT 1980] |
| A. | \[{{C}_{2}}{{H}_{2}}+2{{H}_{2}}\to {{C}_{2}}{{H}_{6}};\,\,\Delta E=-314.0\,kJ\] |
| B. | \[C+{{O}_{2}}\to C{{O}_{2}};\,\,\Delta E=-393.5\,kJ\] |
| C. | \[{{N}_{2}}+{{O}_{2}}\to 2NO;\,\,\Delta E-180.5\,kJ\] |
| D. | \[2{{H}_{2}}+{{O}_{2}}\to 2{{H}_{2}}O;\,\,\Delta E+571.8\,kJ\] |
| Answer» D. \[2{{H}_{2}}+{{O}_{2}}\to 2{{H}_{2}}O;\,\,\Delta E+571.8\,kJ\] | |
| 5332. |
Correct relationship between heat of fusion \[(\Delta {{H}_{fus}})\], heat of vaporization \[(\Delta {{H}_{vap}})\] and heat of sublimation \[(\Delta {{H}_{sub}})\] is |
| A. | \[\Delta {{H}_{fus}}=\Delta {{H}_{vap}}+\Delta {{H}_{sub}}\] |
| B. | \[\Delta {{H}_{vap}}=\Delta {{H}_{fus}}+\Delta {{H}_{sub}}\] |
| C. | \[\Delta {{H}_{sub}}=\Delta {{H}_{vap}}+\Delta {{H}_{fus}}\] |
| D. | \[\Delta {{H}_{sub}}=\Delta {{H}_{vap}}-\Delta {{H}_{fus}}\] |
| Answer» D. \[\Delta {{H}_{sub}}=\Delta {{H}_{vap}}-\Delta {{H}_{fus}}\] | |
| 5333. |
The heat of transition \[(\Delta {{H}_{t}})\] of graphite into diamond would be, where \[C(\text{graphite})+{{O}_{2}}(g)\to C{{O}_{2}}(g);\,\,\Delta H=x\,kJ\] \[C(\text{diamond})\,+{{C}_{2}}(g)\to C{{O}_{2}}(g);\,\,\Delta H=y\,kJ\] [Pb. PET 1985] |
| A. | \[(x+y)\,kJ\,mo{{l}^{-1}}\] |
| B. | \[(x-y)\,kJ\,mo{{l}^{-1}}\] |
| C. | \[(y-x)\,kJ\,mo{{l}^{-1}}\] |
| D. | None of these |
| Answer» C. \[(y-x)\,kJ\,mo{{l}^{-1}}\] | |
| 5334. |
Molar heat of vaporisation of a liquid is \[6kJ\,mo{{l}^{-1}}\]. If the entropy change is \[16J\,mo{{l}^{-1}}\,{{K}^{-1}}\], the boiling point of the liquid is [KCET 2005] |
| A. | \[{{375}^{o}}C\] |
| B. | \[375K\] |
| C. | \[273K\] |
| D. | \[{{102}^{o}}C\] |
| Answer» C. \[273K\] | |
| 5335. |
If \[\Delta H_{f}^{o}\] for \[{{H}_{2}}{{O}_{2}}\] and \[{{H}_{2}}O\] are \[-188\,kJ/mole\] and \[-286\,kJ/mole\]. What will be the enthalpy change of the reaction \[2{{H}_{2}}{{O}_{2}}(l)\to 2{{H}_{2}}O(l)+{{O}_{2}}(g)\] [MP PMT 1992] |
| A. | \[-196\,kJ/mole\] |
| B. | \[146\,kJ/mole\] |
| C. | \[-494\,kJ/mole\] |
| D. | \[-98\,kJ/mole\] |
| Answer» B. \[146\,kJ/mole\] | |
| 5336. |
The enthalpy change \[(\Delta H)\] for the neutralization of \[1M\,HCl\] by caustic potash in dilute solution at \[298K\] is [DPMT 2005] |
| A. | 68 kJ |
| B. | 65 kJ |
| C. | 57.3 kJ |
| D. | 50 kJ |
| Answer» D. 50 kJ | |
| 5337. |
Given : \[2Fe+\frac{3}{2}{{O}_{2}}\to F{{e}_{2}}{{O}_{3}},\,\Delta H=-193.4\,kJ\]; \[Mg+\frac{1}{2}{{O}_{2}}\to MgO,\,\Delta H=-140.2\,kJ\] What is the \[\Delta H\] of the reaction \[Mg+F{{e}_{2}}{{O}_{3}}\to 3MgO+2Fe\] [Orissa JEE 2005] |
| A. | ? 1802 kJ |
| B. | +1802 kJ |
| C. | ? 800 kJ |
| D. | + 228 kJ |
| Answer» E. | |
| 5338. |
How much energy is released when 6 mole of octane is burnt in air ? Given \[\Delta H_{f}^{o}\] for \[C{{O}_{2}}(g),\,{{H}_{2}}O(g)\] and \[{{C}_{8}}{{H}_{18}}(l)\] respectively are ? 490,? 240 and + 160 kJ/mol [AIIMS 2004] |
| A. | ? 6.2 kJ |
| B. | ? 37.4 kJ |
| C. | ? 35.5 kJ |
| D. | ? 20.0 kJ |
| Answer» C. ? 35.5 kJ | |
| 5339. |
\[\Delta H{{{}^\circ }_{f}}\] (298K) of methanol is given by the chemical equation [AIIMS 2005] |
| A. | \[C{{H}_{4}}(g)+1/2{{O}_{2}}(g)\to C{{H}_{3}}OH(g)\] |
| B. | C (graphite) \[+1/2{{O}_{2}}(g)+2{{H}_{2}}(g)\to C{{H}_{3}}OH(l)\] |
| C. | C (diamond) \[+1/2{{O}_{2}}(g)+2{{H}_{2}}(g)\to C{{H}_{3}}OH(l)\] |
| D. | \[CO(g)+2{{H}_{2}}(g)\to C{{H}_{3}}OH(l)\] |
| Answer» C. C (diamond) \[+1/2{{O}_{2}}(g)+2{{H}_{2}}(g)\to C{{H}_{3}}OH(l)\] | |
| 5340. |
If (i) \[C+{{O}_{2}}\to C{{O}_{2}}\], (ii) \[C+1/2{{O}_{2}}\to CO\], (iii) \[CO+1/2{{O}_{2}}\to C{{O}_{2}}\], the heats of reaction are \[Q,\,-12,\,-10\] respectively. Then \[Q=\] [Orissa JEE 2004] |
| A. | ? 2 |
| B. | 2 |
| C. | ? 22 |
| D. | ? 16 |
| Answer» D. ? 16 | |
| 5341. |
The enthalpies of combustion of carbon and carbon monodie are ?393.5 and ?283 kJ mol?1 respectivley. The enthalpy of formation of carbon monoxide per mole is [AIEEE 2004] |
| A. | \[-676.5\,kJ\] |
| B. | \[676.5\,kJ\] |
| C. | \[110.5\,kJ\] |
| D. | \[-110.5\,kJ\] |
| Answer» E. | |
| 5342. |
The enthalpy of combustion of methane at \[{{25}^{o}}C\] is \[890\,kJ\]. The heat liberated when \[3.2\,g\] of methane is burnt in air is [KCET 2004] |
| A. | \[445\,kJ\] |
| B. | \[278\,kJ\] |
| C. | \[-890\,kJ\] |
| D. | \[178\,kJ\] |
| Answer» E. | |
| 5343. |
Which of the following pairs has heat of neutralisation equal to 13.7 Kcals [DCE 2003] |
| A. | \[HCl,\,N{{H}_{4}}OH\] |
| B. | \[HN{{O}_{3}},\,KOH\] |
| C. | \[NaOH,\,C{{H}_{3}}COOH\] |
| D. | \[{{H}_{2}}S{{O}_{4}},\,N{{H}_{4}}OH\] |
| Answer» C. \[NaOH,\,C{{H}_{3}}COOH\] | |
| 5344. |
If the heat of formation of \[C{{O}_{2}}\] is\[-393\,kJ\]. The amount of heat evolved in the formation of 0.156 kg of \[C{{O}_{2}}\] is [MH CET 2004] |
| A. | \[-1357.9\,\,kJ\] |
| B. | \[-1275.9\,kJ\] |
| C. | \[-1572.0\,kJ\] |
| D. | \[-1165.5\,kJ\] |
| Answer» D. \[-1165.5\,kJ\] | |
| 5345. |
Which of the following equations correctly represents the standard heat of formation \[(\Delta H_{f}^{o})\] of methane [UPSEAT 2004] |
| A. | \[C\](diamond) \[+4{{H}_{(g)}}\to C{{H}_{4\,(g)}}\] |
| B. | \[C\] (diamond) \[+2{{H}_{2\,(g)}}\to C{{H}_{4\,(g)}}\] |
| C. | \[C\] (graphite) \[+2{{H}_{2\,(g)}}\to C{{H}_{4\,(g)}}\] |
| D. | \[C\] (graphite) \[+4{{H}_{(g)}}\to C{{H}_{4\,(g)\,}}\] |
| Answer» D. \[C\] (graphite) \[+4{{H}_{(g)}}\to C{{H}_{4\,(g)\,}}\] | |
| 5346. |
The heat of combustion of carbon to \[C{{O}_{2}}\] is \[-393.5\,kJ/mol\]. The heat released upon formation of 35.2 g of \[C{{O}_{2}}\] from carbon and oxygen gas is [UPSEAT 2004] |
| A. | \[+\,315\,kJ\] |
| B. | \[-\,31.5\,kJ\] |
| C. | \[-315\,kJ\] |
| D. | \[+31.5\,kJ\] |
| Answer» D. \[+31.5\,kJ\] | |
| 5347. |
For complete neutralization of \[HCl\] with \[NaOH,\] the heat of neutralization is [MP PET 2003] |
| A. | \[+13.70\,kJ\,mo{{l}^{-1}}\] |
| B. | \[-13.70\,kJ\,mo{{l}^{-1}}\] |
| C. | \[-57.32\,kJ\,mo{{l}^{-1}}\] |
| D. | \[+57.32\,kJ\,mo{{l}^{-1}}\] |
| Answer» D. \[+57.32\,kJ\,mo{{l}^{-1}}\] | |
| 5348. |
What is the weight of oxygen that is required for the complete combustion of 2.8 kg of ethylene? [BVP 2003] |
| A. | 9.6 kg |
| B. | 96.0 kg |
| C. | 6.4 kg |
| D. | 2.8 kg |
| Answer» B. 96.0 kg | |
| 5349. |
\[{{C}_{\text{dia}}}\] + \[{{O}_{2}}\to C{{O}_{2}};\] \[\Delta H=-395.3\,kJ/mole\] \[{{C}_{gr}}+{{O}_{2}}\to C{{O}_{2}};\,\Delta H=-393.4\,kJ/mole\] \[{{C}_{gr}}\to {{C}_{\text{dia}}};\,\Delta H=\] [BHU 2003] |
| A. | ? 3.8 |
| B. | ? 1.9 |
| C. | + 3.8 |
| D. | + 1.9 |
| Answer» E. | |
| 5350. |
The absolute enthalphy of neutralisation of the reaction \[MgO(s)+2HCl(aq)\to MgC{{l}_{2}}(aq)+{{H}_{2}}O(l)\]will be [CBSE PMT 2005] |
| A. | Less than \[-57.33\ kJ\ mo{{l}^{-1}}\] |
| B. | \[-57.33\ kJ\ mo{{l}^{-1}}\] |
| C. | Greater than \[-57.33\ kJ\ mo{{l}^{-1}}\] |
| D. | \[57.33\ kJ\ mo{{l}^{-1}}\] |
| Answer» B. \[-57.33\ kJ\ mo{{l}^{-1}}\] | |