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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.
| 5351. |
For which one of the following equations is \[\Delta H_{\text{react}}^{o}\] equal to \[\Delta H_{f}^{o}\] for the product [CBSE PMT 2003] |
| A. | \[2CO(g)+{{O}_{2}}(g)\,\to \,2C{{O}_{2}}(g)\] |
| B. | \[{{N}_{2}}(g)+{{O}_{3}}(g)\,\to \,{{N}_{2}}{{O}_{3}}(g)\] |
| C. | \[C{{H}_{4}}(g)+2C{{l}_{2}}(g)\,\to \,C{{H}_{2}}C{{l}_{2}}(l)+2HCl(g)\] |
| D. | \[Xe(g)+2{{F}_{2}}(g)\,\to \,Xe{{F}_{4}}(g)\] |
| Answer» E. | |
| 5352. |
Enthalpy change for a reaction does not depend upon [AIEEE 2003] |
| A. | The physical states of reactants and products |
| B. | Use of different reactants for the same product |
| C. | The nature of intermediate reaction steps |
| D. | The differences in initial or final temperatures of involved substances |
| Answer» D. The differences in initial or final temperatures of involved substances | |
| 5353. |
One gram sample of \[N{{H}_{4}}N{{O}_{3}}\] is decomposed in a bomb calorimeter. The temperature of the calorimeter increases by 6.12 K the heat capacity of the system is 1.23 kJ/g/deg. What is the molar heat of decomposition for \[N{{H}_{4}}N{{O}_{3}}\] [AIIMS 2003] |
| A. | ? 7.53 kJ/mol |
| B. | ? 398.1 kJ/mol |
| C. | ? 16.1 kJ/mol |
| D. | ? 602 kJ/mol |
| Answer» B. ? 398.1 kJ/mol | |
| 5354. |
Which of the reaction defines \[\Delta H_{f}^{o}\] [IIT -JEE (Screening) 2003] |
| A. | \[{{C}_{(\text{diamond})}}+{{O}_{2}}(g)\,\to \,C{{O}_{2}}(g)\] |
| B. | \[\frac{1}{2}{{H}_{2}}(g)+\frac{1}{2}{{F}_{2}}(g)\,\to \,HF(g)\] |
| C. | \[{{N}_{2}}(g)+3{{H}_{2}}(g)\,\to \,2N{{H}_{3}}(g)\] |
| D. | \[CO(g)+\frac{1}{2}{{O}_{2}}(g)\,\to \,C{{O}_{2}}(g)\] |
| Answer» C. \[{{N}_{2}}(g)+3{{H}_{2}}(g)\,\to \,2N{{H}_{3}}(g)\] | |
| 5355. |
1 mole of conc. HCl requires X moles of dilute NaOH for neutralisation and 1 mole of concentrate \[{{H}_{2}}S{{O}_{4}}\] requires Y moles of small dilute \[NaOH\] then which of the following reaction is true [MH CET 2002] |
| A. | \[Y=\frac{1}{2}X\] |
| B. | \[X=\frac{1}{2}Y\] |
| C. | \[X=2Y\] |
| D. | None of these |
| Answer» C. \[X=2Y\] | |
| 5356. |
On combustion, carbon forms two oxides CO and \[C{{O}_{2}}\], Heat of formation of \[C{{O}_{2}}\] gas is 94.3 kcal and that of CO is 26.0 kcal. Heat of combustion of carbon is [JIPMER 2002] |
| A. | 26.0 kcal |
| B. | ? 94.3 kcal |
| C. | 68.3 kcal |
| D. | ? 120.3 kcal |
| Answer» C. 68.3 kcal | |
| 5357. |
Which of the following reactions is not exothermic [MP PET 2002] |
| A. | \[C(s)+{{O}_{2}}(g)\,\to \,C{{O}_{2}}(g)\] |
| B. | \[C(s)+2S(s)\,\to \,C{{S}_{2}}(g)\] |
| C. | \[C{{H}_{4}}(g)+2{{O}_{2}}(g)\,\to \,C{{O}_{2}}(g)+2{{H}_{2}}O(l)\] |
| D. | \[CO(g)+\frac{1}{2}{{O}_{2}}(g)\,\to \,C{{O}_{2}}(g)\] |
| Answer» C. \[C{{H}_{4}}(g)+2{{O}_{2}}(g)\,\to \,C{{O}_{2}}(g)+2{{H}_{2}}O(l)\] | |
| 5358. |
If a mole of \[{{H}_{2}}\] molecule is heated to high temperature the following reaction takes place [Kerala (Med.) 2002] |
| A. | \[{{H}_{2}}(g)+436\,kJ=H(g)+H(g)\] |
| B. | \[{{H}_{2}}(g)+820\,kJ=2{{H}_{2}}(g)\] |
| C. | \[2{{H}_{2}}(g)+436\,J=2{{H}_{2}}\] |
| D. | \[{{H}_{2}}+{{H}_{2}}={{H}^{+}}+{{H}^{+}}\] |
| Answer» B. \[{{H}_{2}}(g)+820\,kJ=2{{H}_{2}}(g)\] | |
| 5359. |
The heat of neutralisation will be highest in [MP PMT 2002] |
| A. | \[N{{H}_{4}}OH\] and \[C{{H}_{3}}COOH\] |
| B. | \[N{{H}_{4}}OH\] and \[HCl\] |
| C. | \[KOH\] and \[C{{H}_{3}}COOH\] |
| D. | \[KOH\] and \[HCl\] |
| Answer» E. | |
| 5360. |
Enthalpy of neutralisation of \[N{{H}_{4}}OH\] and \[HCl\], is numerically [JIPMER 2002; Kurukshetra CEE 2002] |
| A. | \[57.1\,\,kJ\,mo{{l}^{-1}}\] |
| B. | \[<57.1\,\,kJ\,mo{{l}^{-1}}\] |
| C. | \[>57.1\,\,kJ\,mo{{l}^{-1}}\] |
| D. | Zero |
| Answer» C. \[>57.1\,\,kJ\,mo{{l}^{-1}}\] | |
| 5361. |
Which of the following statement is correct [NCERT 1978] |
| A. | \[\Delta H\] is positive for exothermic reaction |
| B. | \[\Delta H\] is negative for endothermic reaction |
| C. | The heat of neutralization of strong acid and strong base is always the same |
| D. | The enthalpy of fusion is negative |
| Answer» D. The enthalpy of fusion is negative | |
| 5362. |
If the value of \[\Delta H\] in a reaction is positive, then the reaction is called [BHU 2002] |
| A. | Exothermic |
| B. | Endothermic |
| C. | Polymorphic |
| D. | Polytropic |
| Answer» C. Polymorphic | |
| 5363. |
Heats of combustion \[(\Delta {{H}^{o}})\] for \[C(s),\,{{H}_{2}}(g)\] and \[C{{H}_{4}}(g)\] are \[-94,\,-68\] and \[-213\,kcal/mol.\] respectively. The value of \[\Delta {{H}^{o}}\] for the reaction, \[C(s)+2{{H}_{2}}(g)\,\to \,C{{H}_{4}}(g)\] is [CBSE PMT 2002] |
| A. | ? 85 kcal |
| B. | ? 111 kcal |
| C. | ? 17 kcal |
| D. | ? 170 kcal |
| Answer» D. ? 170 kcal | |
| 5364. |
The heat evolved in the combustion of methane is given by the following equations: \[C{{H}_{4}}(g)+2{{O}_{2}}(g)\,\to \,C{{O}_{2}}(g)+{{H}_{2}}O(l);\]\[\Delta H=-890.3\,kJ\] How many grams of methane would be required to produce 445.15 kJ of heat of combustion [AMU 2002] |
| A. | 4 g |
| B. | 8 g |
| C. | 12 g |
| D. | 16 g |
| Answer» C. 12 g | |
| 5365. |
Compounds with high heat of formation are less stable because [KCET 2002] |
| A. | High temperature is required to synthesise them |
| B. | Molecules of such compounds are distorted |
| C. | It is difficult to synthesis them |
| D. | Energy rich state leads to instability |
| Answer» E. | |
| 5366. |
A cylinder of gas is assumed to contain 11.2 kg of butane \[({{C}_{4}}{{H}_{10}})\]. If a normal family needs 20000 kJ of energy per day. The cylinder will last: (Given that \[\Delta H\] for combustion of butane is ? 2658 kJ) [AMU (Engg.) 2002] |
| A. | 20 days |
| B. | 25 days |
| C. | 26 days |
| D. | 24 days |
| Answer» D. 24 days | |
| 5367. |
When the aqueous solution of 0.5 mole \[HN{{O}_{3}}\] is mixed with the 0.3 mole of \[O{{H}^{-}}\] solution, then what will be the liberated heat (Enthalpy of neutralization is = 57.1 kJ) [Kerala CET 2005] |
| A. | 28.5 kJ |
| B. | 17.1 kJ |
| C. | 45.7 kJ |
| D. | 1.7 kJ |
| E. | 2.85 kJ |
| Answer» C. 45.7 kJ | |
| 5368. |
The heat evolved during the combination of 24 g C and 128 g S following the change is \[C+{{S}_{2}}\to C{{S}_{2}};\,\Delta H=22.0\,kcal\] [MH CET 2001] |
| A. | 11 kcal |
| B. | 32 kcal |
| C. | 44 kcal |
| D. | 22 kcal |
| Answer» D. 22 kcal | |
| 5369. |
A system is changed from state A to state B by one path and from B to A another path. If \[{{E}_{1}}\] and \[{{E}_{2}}\] are the corresponding changes in internal energy, then [Pb. PMT 2001] |
| A. | \[{{E}_{1}}+{{E}_{2}}=-ve\] |
| B. | \[{{E}_{1}}+{{E}_{2}}=+ve\] |
| C. | \[{{E}_{1}}+{{E}_{2}}=0\] |
| D. | None of these |
| Answer» E. | |
| 5370. |
Heat of neutralization of strong acid and weak base is [UPSEAT 2001] |
| A. | \[57.1\,kJ\,mo{{l}^{-1}}\] |
| B. | \[13.7\,kJ\,mo{{l}^{-1}}\] |
| C. | Less than \[13.7\,kcal\,mo{{l}^{-1}}\] |
| D. | More than \[13.7\,kcal\,mo{{l}^{-1}}\] |
| Answer» D. More than \[13.7\,kcal\,mo{{l}^{-1}}\] | |
| 5371. |
If \[C+{{O}_{2}}\to C{{O}_{2}}+94.2\,kcal\] \[{{H}_{2}}+\frac{1}{2}{{O}_{2}}\to \,{{H}_{2}}O+68.3\,kcal\] \[C{{H}_{4}}+2{{O}_{2}}\,\to \,C{{O}_{2}}+2{{H}_{2}}O+210.8\,kcal\] Then the possible heat of methane will be [UPSEAT 2001] |
| A. | 47.3 kcal |
| B. | 20.0 kcal |
| C. | 45.9 kcal |
| D. | ? 47.3 kcal |
| Answer» C. 45.9 kcal | |
| 5372. |
An endothermic reaction is one in which [MNR 1980; NCERT 1976] |
| A. | Heat is converted into electricity |
| B. | Heat is absorbed |
| C. | Heat is evolved |
| D. | Heat is converted into mechanical work |
| Answer» C. Heat is evolved | |
| 5373. |
What is \[\Delta n\] for combustion of 1 mole of benzene, when both the reactants and the products are gas at 298 K [Pb. PMT 2001] |
| A. | 0 |
| B. | 3/2 |
| C. | ? 3/2 |
| D. | ½ |
| Answer» E. | |
| 5374. |
In order to decompose 9 g water 142.5 kJ heat is required. Hence the enthalpy of formation of water is [KCET 2001] |
| A. | ? 142.5 kJ |
| B. | + 142.5 kJ |
| C. | ? 285 kJ |
| D. | + 285 kJ |
| Answer» D. + 285 kJ | |
| 5375. |
For exothermic reaction, the equilibrium constant [JIPMER 2001] |
| A. | Increases with increase of P |
| B. | Decreases with increase of P |
| C. | Increases with increase of temperature |
| D. | Decreases with increase of temperature |
| Answer» E. | |
| 5376. |
The values of \[\Delta H\] for the combustion of ethene and ethyne are ? 341.1 and ? 310.0kcal respectively. Which of the following is a better fuel [BHU 2001] |
| A. | \[{{C}_{2}}{{H}_{2}}\] |
| B. | \[{{C}_{2}}{{H}_{4}}\] |
| C. | Both of these |
| D. | None of these |
| Answer» B. \[{{C}_{2}}{{H}_{4}}\] | |
| 5377. |
Heat of formation of \[{{H}_{2}}O\] is \[-188\,kJ/mole\] and \[{{H}_{2}}{{O}_{2}}\] is \[-286\,kJ/mole.\] The enthalpy change for the reaction \[2{{H}_{2}}{{O}_{2}}\,\to \,2{{H}_{2}}O+{{O}_{2}}\] is [BHU 2001] |
| A. | 196 kJ |
| B. | ? 196 kJ |
| C. | 984 kJ |
| D. | ? 984 kJ |
| Answer» B. ? 196 kJ | |
| 5378. |
The following thermochemical reactions are given \[M+\frac{1}{2}{{O}_{2}}\,\,\to \,\,MO+351.4\,kJ\] \[X+\frac{1}{2}{{O}_{2}}\,\,\to \,\,XO+90.8\,kJ\] It follows that the heat of reaction for the following process \[M+XO\] ⇌ \[MO+X\] is given by [AMU 2001] |
| A. | 422.2 kJ |
| B. | 268.7 kJ |
| C. | ? 442.2 kJ |
| D. | 260.6 kJ |
| Answer» E. | |
| 5379. |
If the heat of combustion of carbon monoxide at constant volume and at \[{{17}^{o}}C\] is ? 283.3 kJ, then its heat of combustion at constant pressure \[(R=8.314\,J\,\text{degre}{{\text{e}}^{\text{-1}}}mo{{l}^{-1}})\] [CPMT 2001] |
| A. | ? 284.5 kJ |
| B. | 284.5 kJ |
| C. | 384.5 kJ |
| D. | ? 384.5 kJ |
| Answer» B. 284.5 kJ | |
| 5380. |
The heat of neutralization of \[HCl\] and \[NaOH\] is [MP PET 2001] |
| A. | Zero |
| B. | ? 57.3 kJ |
| C. | + 57.3 kJ |
| D. | None of these |
| Answer» C. + 57.3 kJ | |
| 5381. |
\[C(s)+{{O}_{2}}(g)\,\to \,C{{O}_{2}};\,\,\,\,\Delta H=-94\,kcal\] \[CO(g)+\frac{1}{2}{{O}_{2}}(g)\,\to \,C{{O}_{2}};\,\,\,\Delta H=135.2\,kcal\] Then heat of formation of \[CO(g)\] is [DCE 2001] |
| A. | ? 26.4 kcal |
| B. | 41.2 kcal |
| C. | 26.4 kcal |
| D. | ? 229.2 kcal |
| Answer» E. | |
| 5382. |
The enthalpy of combustion of \[{{C}_{6}}{{H}_{6(l)}}\] is ? 3250 kJ. When 0.39 g of benzene is burnt excess of oxygen in an open vessel, the amount of heat evolved is [KCET 2000; AFMC 2000; DCE 2000] |
| A. | 16.25 J |
| B. | 16.25 kJ |
| C. | 32.5 J |
| D. | 32.5 kJ |
| Answer» C. 32.5 J | |
| 5383. |
An exothermic reaction is one which [NCERT 1977; MP PMT 1990] |
| A. | Takes place only on heating |
| B. | Is accompanied by a flame |
| C. | Is accompanied by a absorption of heat |
| D. | Is accompanied by evolution of heat |
| Answer» E. | |
| 5384. |
The heat of formation of methane \[C(s)+2{{H}_{2}}(g)\,\to \,C{{H}_{4}}(g)\] at constant pressure is 18500 cal at \[{{25}^{o}}C\]. The heat of reaction at constant volume would be [MH CET 2000] |
| A. | 17904 cal |
| B. | 18202 cal |
| C. | 18798 cal |
| D. | 19096 cal |
| Answer» E. | |
| 5385. |
In the reaction \[C+2S\,\to \,C{{S}_{2}}+\Delta H,\,\Delta H\] is the [AMU (Engg.) 2000] |
| A. | Heat of combustion |
| B. | Heat of neutralization |
| C. | Heat of solution |
| D. | None of these |
| Answer» E. | |
| 5386. |
Which of the following compounds will absorb the maximum quantity of heat when dissolved in the same amount of water ? The heats of solution of these compounds at \[{{25}^{o}}C\] in kJ/mole of each solute is given in brackets [AMU (Engg.) 2000] |
| A. | \[HN{{O}_{3}}(\Delta H=-33)\] |
| B. | \[KCl(\Delta H=+17.64)\] |
| C. | \[N{{H}_{4}}N{{O}_{3}}\,(\Delta H=+25.5)\] |
| D. | \[HCl\,(\Delta H=-74.1)\] |
| Answer» D. \[HCl\,(\Delta H=-74.1)\] | |
| 5387. |
The \[\Delta H_{f}^{o}\] for \[C{{O}_{2}}(g),\,CO(g)\] and \[{{H}_{2}}O(g)\] are ? 393.5, ?110.5 and ? 241.8kJmol?1 respectively. The standard enthalpy change (in kJ) for the reaction \[C{{O}_{2}}(g)+{{H}_{2}}(g)\to \] \[CO(g)+{{H}_{2}}O(g)\] is [IIT JEE (Screening) 2000] |
| A. | 524.1 |
| B. | 41.2 |
| C. | ? 262.5 |
| D. | ? 41.2 |
| Answer» C. ? 262.5 | |
| 5388. |
\[{{H}_{2}}(g)+C{{l}_{2}}(g)\,\,\to \,\,2HCl(g)\,.\,\Delta H=-44kcal\] \[2Na(s)+2HCl(g)\,\,\to \,\,2NaCl(s)+{{H}_{2}}(g),\]\[\Delta H=-152\,kcal\] For the reaction \[Na(s)+\frac{1}{2}C{{l}_{2}}(g)\,\,\to \,\,NaCl(s),\,\Delta H=\] [KCET 2000] |
| A. | ? 108 kcal |
| B. | ? 196 kcal |
| C. | ? 98 kcal |
| D. | 54 kcal |
| Answer» C. ? 98 kcal | |
| 5389. |
The heat evolved in the combustion of benzene is given by the equation \[{{C}_{6}}{{H}_{6}}(l)+7\frac{1}{2}{{O}_{2}}(g)\,\,\to \,\,3{{H}_{2}}O(l)+6C{{O}_{2}}(g)\] \[\Delta H=781.0\,kcal\,\,mo{{l}^{-1}}\] Which of the following quantities of heat energy will be evolved when 39 g of benzene is burnt in an open container [MP PET 2000] |
| A. | 122.25 kcal \[mo{{l}^{-1}}\] |
| B. | 390.5 kcal \[mo{{l}^{-1}}\] |
| C. | 1562.0 kcal \[mo{{l}^{-1}}\] |
| D. | 586.75 kcal \[mo{{l}^{-1}}\] |
| Answer» C. 1562.0 kcal \[mo{{l}^{-1}}\] | |
| 5390. |
The heat change for the following reaction at \[{{298}^{o}}K\] and at constant pressure is \[+7.3\,kcal\] \[{{A}_{2}}B(s)\,\to \,2A(s)+1/2\,{{B}_{2}}(g)\], \[\Delta H=+7.3\,kcal\] The heat change at constant volume would be [DCE 2000] |
| A. | 7.3 kcal |
| B. | More than 7.3 |
| C. | Zero |
| D. | None of these |
| Answer» E. | |
| 5391. |
Heat of neutralization of the acid-base reaction is 57.32 kJ for [JIPMER 2000] |
| A. | \[HN{{O}_{3}}+LiOH\] |
| B. | \[HCOOH+KOH\] |
| C. | \[HCl+N{{H}_{4}}OH\] |
| D. | \[C{{H}_{3}}COOH+NaOH\] |
| Answer» B. \[HCOOH+KOH\] | |
| 5392. |
Enthalpy of neutralisation of acetic acid by \[NaOH\] is \[-50.6\,kJ/mol.\] and the heat of neutralisation of a strong acid with a strong base is ? 55.9 kJ/mol. What is the value of \[\Delta H\] for the ionisation of \[C{{H}_{3}}COOH\] [AIIMS 2000] |
| A. | + 5.3 kJ/mol |
| B. | + 6.2 kJ/mol |
| C. | + 8.2 kJ/mol |
| D. | + 9.3 kJ/mol |
| Answer» B. + 6.2 kJ/mol | |
| 5393. |
In the reaction: \[{{H}_{2}}+C{{l}_{2}}\,\to \,2HCl,\,\Delta H=194\,kJ\]. Heat of formation of \[HCl\] is [KCET 2000; AFMC 2000; CPMT 2000] |
| A. | + 97 kJ |
| B. | + 194 kJ |
| C. | ? 194 kJ |
| D. | ? 97 kJ |
| Answer» B. + 194 kJ | |
| 5394. |
Evaporation of water is [CPMT 1973; DPMT 1982; MP PMT 1989; MP PET 1999] |
| A. | An endothermic change |
| B. | An exothermic change |
| C. | A process where no heat change occurs |
| D. | A process accompanied by chemical reaction |
| Answer» B. An exothermic change | |
| 5395. |
2.1 g of Fe combines with S evolving 3.77 kJ. The heat of formation of FeS in kJ/mol is [AMU (Engg.) 1999] |
| A. | ? 1.79 |
| B. | ? 100.5 |
| C. | ? 3.77 |
| D. | None of these |
| Answer» C. ? 3.77 | |
| 5396. |
When a strong acid, strong base or their salt are dissolved in water, they are completely ionised. If a strong acid is added to a strong base, \[{{H}^{+}}\] ions from the former combine with \[O{{H}^{-}}\] ions of the latter forming water. The formation of each water molecule liberates a certain quantity of energy and the reaction is exothermic. The heat liberated when one mole of water is formed by combining hydrochloric acid and sodium hydroxide is 13.7 kcal. The heat liberated when one mole of water is formed by combining sulphuric acid and sodium hydroxide is [AMU (Engg.) 1999] |
| A. | 25.5 kcal |
| B. | 8.5 kcal |
| C. | 13.7 kcal |
| D. | 34 kcal |
| Answer» D. 34 kcal | |
| 5397. |
When 4 g of iron is burnt to ferric oxide at constant pressure, 29.28 kJ of heat is evolved. What is the enthalpy of formation of ferric oxide (At. Wt. of Fe = 56) [AIIMS 1999] |
| A. | ? 81.98 kJ |
| B. | ? 819.8 kJ |
| C. | ? 40.99 kJ |
| D. | + 819.8 kJ |
| Answer» C. ? 40.99 kJ | |
| 5398. |
When \[50\,c{{m}^{3}}\] of a strong acid is added to \[50\,c{{m}^{3}}\] of an alkali, the temperature rises by \[{{5}^{o}}C\]. If \[250\,c{{m}^{3}}\] of each liquid are mixed, the temperature rise would be [KCET 1999] |
| A. | \[{{5}^{o}}C\] |
| B. | \[{{10}^{o}}C\] |
| C. | \[{{25}^{o}}C\] |
| D. | \[{{20}^{o}}C\] |
| Answer» B. \[{{10}^{o}}C\] | |
| 5399. |
\[{{H}_{2}}(g)+\frac{1}{2}{{O}_{2}}(g)\,\,\to \,\,{{H}_{2}}O(l)\]; \[\Delta H\] at 298 K = ? 285.8 kJ The molar enthalpy of vaporisation of water at 1 atm and \[{{25}^{o}}C\] is 44 kJ. The standard enthalpy of formation of 1 mole of water vapour at \[{{25}^{o}}C\] is [KCET 1999] |
| A. | ? 241.8 kJ |
| B. | 241.8 kJ |
| C. | 329.8 kJ |
| D. | ?329.8 kJ |
| Answer» B. 241.8 kJ | |
| 5400. |
Calculate the heat of formation of \[PC{{l}_{5}}(s)\] from the following data \[2P(s)+3C{{l}_{2}}(g)\,\,\to \,\,2PC{{l}_{3}}(l);\,\Delta H=-151.8\,kcal\] \[PC{{l}_{3}}(l)+C{{l}_{2}}(g)\,\,\to \,\,PC{{l}_{5}}(s);\,\,\Delta H=-32.8\,kcal\] [JIPMER 1999] |
| A. | ? 108.7 kcal |
| B. | + 108.7 kcal |
| C. | ? 184.6 kcal |
| D. | + 184.6 kcal |
| Answer» B. + 108.7 kcal | |