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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.
| 5401. |
Combustion of glucose takes place according to the equation, \[{{C}_{6}}{{H}_{12}}{{O}_{6}}+6{{O}_{2}}\to 6C{{O}_{2}}+6{{H}_{2}}O\],\[\Delta H=-72\,kcal\]. How much energy will be required for the production of 1.6 g of glucose (Molecular mass of glucose = 180 g) [AFMC 1999] |
| A. | 0.064 kcal |
| B. | 0.64 kcal |
| C. | 6.4 kcal |
| D. | 64 kcal |
| Answer» C. 6.4 kcal | |
| 5402. |
Given that \[C(s)+{{O}_{2}}(g)\to C{{O}_{2}}(g),\Delta H=-394kJ\] \[2{{H}_{2}}(g)+{{O}_{2}}(g)\to 2{{H}_{2}}O(l),\,\Delta H=568kJ\] \[C{{H}_{4}}(g)+2{{O}_{2}}(g)\,\,\to \,\,C{{O}_{2}}(g)+2{{H}_{2}}O(l)\]\[\Delta H=-892\,kJ\] Heat of formation of \[C{{H}_{4}}\] is [DCE 1999] |
| A. | ? 70 kJ |
| B. | 71.8 kJ |
| C. | ? 244 kJ |
| D. | + 782 kJ |
| Answer» B. 71.8 kJ | |
| 5403. |
When \[0.5g\] of sulphur is burnt to \[S{{O}_{2}},\,4.6\,kJ\] of heat is liberated. What is the enthalpy of formation of sulphur dioxide [KCET 1998; AFMC 2001] |
| A. | + 147.2 kJ |
| B. | ? 147.2 kJ |
| C. | ? 294.4 kJ |
| D. | + 294.4 kJ |
| Answer» D. + 294.4 kJ | |
| 5404. |
Ozone is prepared by passing silent electric discharge through oxygen. In this reaction [AFMC 1998] |
| A. | Energy is given out |
| B. | Energy is absorbed |
| C. | Oxygen is loaded with energy |
| D. | Oxygen is dissociated into atoms |
| Answer» B. Energy is absorbed | |
| 5405. |
The following is (are) endothermic reaction [IIT JEE 1999] |
| A. | Combustion of methane |
| B. | Decomposition of water |
| C. | Dehydrogenation of ethane to ethylene |
| D. | Conversion of graphite to diamond |
| Answer» C. Dehydrogenation of ethane to ethylene | |
| 5406. |
The neutralisation of a strong acid by a strong base liberates an amount of energy per mole of \[{{H}^{+}}\] that [BHU 1998] |
| A. | Depends upon which acid and base are involved |
| B. | Depends upon the temperature at which the reaction takes place |
| C. | Depends upon which catalyst is used |
| D. | Is always the same |
| Answer» E. | |
| 5407. |
Equal volumes of methanoic acid and sodium hydroxide are mixed. If \[x\] is the heat of formation of water, then heat evolved on neutralisation is [BHU 1998] |
| A. | More than \[x\] |
| B. | Equal to \[x\] |
| C. | Twice of \[x\] |
| D. | Less than \[x\] |
| Answer» E. | |
| 5408. |
The combustion enthalpies of carbon, hydrogen and methane are \[-395.5\,kJ\,mo{{l}^{-1}}\], \[-285.8\,kJ\,mo{{l}^{-1}}\] and \[-890.4\,kJ\,mo{{l}^{-1}}\] respectively at \[{{25}^{o}}C\]. The value of standard formation enthalpies of methane at that temperature is [Pb. PMT 1998] |
| A. | \[890.4\,kJ\,mo{{l}^{-1}}\] |
| B. | \[-298.8\,kJ\,mo{{l}^{-1}}\] |
| C. | \[-74.7\,kJ\,mo{{l}^{-1}}\] |
| D. | \[-107.7\,kJ\,mo{{l}^{-1}}\] |
| Answer» D. \[-107.7\,kJ\,mo{{l}^{-1}}\] | |
| 5409. |
\[S+\frac{3}{2}{{O}_{2}}\to S{{O}_{3}}+2x\,kcal\] \[S{{O}_{2}}+\frac{1}{2}{{O}_{2}}\to S{{O}_{3}}+y\,kcal\] Find out the heat of formation of \[S{{O}_{2}}\] [AIIMS 1997; CBSE PMT 1999; KCET 1999] |
| A. | \[2x-y\] |
| B. | \[2x+y\] |
| C. | \[x+y\] |
| D. | \[2x/y\] |
| Answer» B. \[2x+y\] | |
| 5410. |
The enthalpy change of a reaction does not depend on [AIIMS 1997] |
| A. | The state of reactants and products |
| B. | Nature of reactants and products |
| C. | Different intermediate reaction |
| D. | Initial and final enthalpy change of a reaction |
| Answer» D. Initial and final enthalpy change of a reaction | |
| 5411. |
The enthalpy of solution of \[BaC{{l}_{2}}(s)\] and \[BaC{{l}_{2}}.2{{H}_{2}}O(s)\] are \[-20.6\] and \[8.8\,kJ\,mo{{l}^{-1}}\] respectively. The enthalpy change for the reaction \[BaC{{l}_{2}}(s)+2{{H}_{2}}O\to \] is [Roorkee Qualifying 1998] |
| A. | 29.4 kJ |
| B. | ? 11.8 kJ |
| C. | ? 20.6 kJ |
| D. | ? 29.4 kJ |
| Answer» E. | |
| 5412. |
For the reaction \[A(g)+2B(g)\to 2C(g)+3D(g)\], the value of \[\Delta E\] at \[{{27}^{o}}C\] is 19.0 kcal. The value of \[\Delta H\] for the reaction would be \[(R=2.0\,cal\,{{K}^{-1}}mo{{l}^{-1}})\] [Roorkee Qualifying 1998] |
| A. | 20.8 kcal |
| B. | 19.8 kcal |
| C. | 18.8 kcal |
| D. | 20.2 kcal |
| Answer» E. | |
| 5413. |
\[8\,gm\] of \[C{{H}_{4}}\] is completely burnt in air. The number of moles of water produced are [Orissa JEE 1997] |
| A. | 0.5 |
| B. | 1 |
| C. | 2 |
| D. | 18 |
| Answer» D. 18 | |
| 5414. |
Fermentation is a reaction called [RPMT 1997] |
| A. | Endothermic |
| B. | Exothermic |
| C. | Is temperature |
| D. | Reversible |
| Answer» C. Is temperature | |
| 5415. |
Calculate the standard heat of formation of carbon disulphide \[(l)\], given that the standard heat of combustion of carbon \[(s)\], sulphur \[(s)\] and carbon disulphide \[(l)\] are \[-393.3,\,-293.72\] and \[-1108.76\,kJ\,mo{{l}^{-1}}\] respectively [Roorkee 1989; BHU 1997] |
| A. | \[-128.02\,kJ\,mo{{l}^{-1}}\] |
| B. | \[+12.802\,kJ\,mo{{l}^{-1}}\] |
| C. | \[+128.02\,kJ\,mo{{l}^{-1}}\] |
| D. | \[-12.802\,kJ\,mo{{l}^{-1}}\] |
| Answer» D. \[-12.802\,kJ\,mo{{l}^{-1}}\] | |
| 5416. |
Thermochemical reactions \[C(\text{graphite})+\frac{1}{2}{{O}_{2}}(g)\to CO(g);\,\Delta H=-110.5\,kJ\] \[CO(g)+\frac{1}{2}{{O}_{2}}(g)\to C{{O}_{2}}(g);\,\Delta H=-283.2\,kJ\] From the above reaction, the heat of reaction for \[C(\text{graphite})+{{O}_{2}}(g)\to C{{O}_{2}}(g)\] will be [CPMT 1988; MP PMT 1989] |
| A. | ? 393.7 kJ |
| B. | + 393.7 kJ |
| C. | ? 172.7 kJ |
| D. | + 172.7 kJ |
| Answer» B. + 393.7 kJ | |
| 5417. |
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 [MP PET 1990] |
| A. | 47.3 kcal |
| B. | 20.0 kcal |
| C. | 45.9 kcal |
| D. | ? 47.3 kcal |
| Answer» C. 45.9 kcal | |
| 5418. |
The bleaching action of the bleaching powder is due to the liberation of [MP PMT 1994] |
| A. | Chlorine |
| B. | Molecular oxygen |
| C. | Nascent oxygen |
| D. | Calcium carbonate |
| Answer» D. Calcium carbonate | |
| 5419. |
Which of the following oxidizes \[{{H}_{2}}O\] to oxygen [MP PET 1994] |
| A. | Chlorine |
| B. | Fluorine |
| C. | Bromine |
| D. | Iodine |
| Answer» C. Bromine | |
| 5420. |
The above answer is correct because the chosen halide has [AIIMS 1982] |
| A. | Minimum ionic character |
| B. | Maximum ionic character |
| C. | Highest oxidising power |
| D. | Lowest polarity |
| Answer» C. Highest oxidising power | |
| 5421. |
Which one is highest melting halide [AIIMS 1982; BHU 1999] |
| A. | \[NaCl\] |
| B. | \[NaBr\] |
| C. | \[NaF\] |
| D. | \[NaI\] |
| Answer» D. \[NaI\] | |
| 5422. |
Concentrated \[HN{{O}_{3}}\] reacts with \[{{I}_{2}}\] to give [IIT 1989; Roorkee 1995; JIPMER 2001] |
| A. | \[HI\] |
| B. | \[HOI\] |
| C. | \[HOI{{O}_{3}}\] |
| D. | \[HOI{{O}_{3}}\] |
| Answer» D. \[HOI{{O}_{3}}\] | |
| 5423. |
The formula of some fluorides are given below. Which of them will combine further with fluorine [NCERT 1977] |
| A. | \[I{{F}_{5}}\] |
| B. | \[NaF\] |
| C. | \[Ca{{F}_{2}}\] |
| D. | \[S{{F}_{5}}\] |
| Answer» B. \[NaF\] | |
| 5424. |
The element which never acts as reducing agent in a chemical reaction is [Bihar CEE 1995] |
| A. | \[O\] |
| B. | \[Li\] |
| C. | \[F\] |
| D. | \[C\] |
| Answer» D. \[C\] | |
| 5425. |
Which of the following chemical contains chlorine [MP PET 1999] |
| A. | Fischer salt |
| B. | Epsom salt |
| C. | Fremy's salt |
| D. | Spirit of salt |
| Answer» E. | |
| 5426. |
Which of the following halogens is solid at room temperature [MP PET 1999; AFMC 1999] |
| A. | Chlorine |
| B. | Iodine |
| C. | Bromine |
| D. | Fluorine |
| Answer» C. Bromine | |
| 5427. |
Which one is the anhydride of \[HCl{{O}_{4}}\] [AIIMS 1983; BHU 1983; AMU 1984] |
| A. | \[C{{l}_{2}}O\] |
| B. | \[Cl{{O}_{2}}\] |
| C. | \[C{{l}_{2}}{{O}_{6}}\] |
| D. | \[C{{l}_{2}}{{O}_{7}}\] |
| Answer» E. | |
| 5428. |
Which of the following will not occur [MP PET/PMT 1988] |
| A. | \[Fe+{{H}_{2}}S{{O}_{4}}\to FeS{{O}_{4}}+{{H}_{2}}\] |
| B. | \[Cu+2AgN{{O}_{3}}\to Cu{{(N{{O}_{3}})}_{2}}+2Ag\] |
| C. | \[2KBr+{{I}_{2}}\to 2KI+B{{r}_{2}}\] |
| D. | \[CuO+{{H}_{2}}\to Cu+{{H}_{2}}O\] |
| Answer» D. \[CuO+{{H}_{2}}\to Cu+{{H}_{2}}O\] | |
| 5429. |
The type of hybrid orbitals used by chlorine atom in \[ClO_{2}^{-}\] is [IIT 1992] |
| A. | \[S{{P}^{3}}\] |
| B. | \[S{{P}^{2}}\] |
| C. | \[SP\] |
| D. | None of these |
| Answer» B. \[S{{P}^{2}}\] | |
| 5430. |
Hydrogen bonding is present in [MP PMT 1989; DPMT 1990; Roorkee 1995] |
| A. | \[HF\] |
| B. | \[HCl\] |
| C. | \[HBr\] |
| D. | \[HI\] |
| Answer» B. \[HCl\] | |
| 5431. |
Which of the following hydrogen halides has the highest boiling point [AIIMS 1980; DPMT 1983; MP PMT 1989] |
| A. | \[HF\] |
| B. | \[HCl\] |
| C. | \[HBr\] |
| D. | \[Hi\] |
| Answer» B. \[HCl\] | |
| 5432. |
Which has the highest molar heat of vaporisation [CPMT 1991] |
| A. | \[HF\] |
| B. | \[HCl\] |
| C. | \[HBr\] |
| D. | \[HI\] |
| Answer» E. | |
| 5433. |
Mark the strongest acid [Bihar MEE 1996; MP PET/PMT 1998; NCERT 1974; CPMT 1976, 90] |
| A. | \[HF\] |
| B. | \[HCl\] |
| C. | \[HBr\] |
| D. | \[HI\] |
| Answer» E. | |
| 5434. |
\[HBr\] and \[HI\] reduce sulphuric acid, \[HCl\] can reduce \[KMn{{O}_{4}}\] and \[HF\] can reduce [IIT 1981; MP PET 1993] |
| A. | \[{{H}_{2}}S{{O}_{4}}\] |
| B. | \[KMn{{O}_{4}}\] |
| C. | \[{{K}_{2}}C{{r}_{2}}{{O}_{7}}\] |
| D. | None of these |
| Answer» E. | |
| 5435. |
Hydrogen bonding does not play any role in boiling of [AFMC 1992] |
| A. | \[N{{H}_{3}}\] |
| B. | \[{{H}_{2}}O\] |
| C. | \[HI\] |
| D. | \[{{C}_{2}}{{H}_{5}}OH\] |
| Answer» D. \[{{C}_{2}}{{H}_{5}}OH\] | |
| 5436. |
Sodium chloride when heated with conc. \[{{H}_{2}}S{{O}_{4}}\] and solid potassium dichromate gives [CPMT 1981, 84] |
| A. | Chromic chloride |
| B. | Chromyl chloride |
| C. | Chromous chloride |
| D. | None of these |
| Answer» C. Chromous chloride | |
| 5437. |
Bad conductor of electricity is [MP PET/PMT 1988] |
| A. | \[{{H}_{2}}{{F}_{2}}\] |
| B. | \[HCl\] |
| C. | \[HBr\] |
| D. | \[HI\] |
| Answer» B. \[HCl\] | |
| 5438. |
A solution of \[HCl\] in water is good conductor while gaseous hydrogen chloride is not. This is due to the reason that [NCERT 1980] |
| A. | Water is a good conductor of electricity |
| B. | \[HCl\] in water ionizes |
| C. | Gas can not conduct electricity but water can |
| D. | None of these |
| Answer» C. Gas can not conduct electricity but water can | |
| 5439. |
\[HI\] cannot be prepared by the action of conc. \[{{H}_{2}}S{{O}_{4}}\] on \[KI\] because [MNR 1984] |
| A. | \[HI\] is stronger than \[{{H}_{2}}S{{O}_{4}}\] |
| B. | \[HI\] is more volatile than \[{{H}_{2}}S{{O}_{4}}\] |
| C. | \[{{H}_{2}}S{{O}_{4}}\] is an oxidising agent |
| D. | \[{{H}_{2}}S{{O}_{4}}\] forms complex |
| Answer» D. \[{{H}_{2}}S{{O}_{4}}\] forms complex | |
| 5440. |
\[HCl\] is a gas, but \[HF\] is a low boiling liquid. This is because [EAMCET 1981, 89] |
| A. | \[H-F\] bond is strong |
| B. | \[H-F\] bond is weak |
| C. | The molecules aggregate because of hydrogen bonding in \[HF\] |
| D. | \[HF\] is a weak acid |
| Answer» D. \[HF\] is a weak acid | |
| 5441. |
The type of bonding in \[HCl\] molecule is [AIIMS 1992] |
| A. | Pure covalent |
| B. | Polar covalent |
| C. | Highly covalent |
| D. | H-bonding |
| Answer» C. Highly covalent | |
| 5442. |
\[KI\] when heated with conc. \[{{H}_{2}}S{{O}_{4}}\] gives [MP PET/PMT 1988] |
| A. | \[HI\] |
| B. | \[{{I}_{2}}\] |
| C. | \[HI{{O}_{3}}\] |
| D. | \[KI{{O}_{3}}\] |
| Answer» C. \[HI{{O}_{3}}\] | |
| 5443. |
Which of the following halogen oxides is ionic [CPMT 1989] |
| A. | \[Cl{{O}_{2}}\] |
| B. | \[Br{{O}_{2}}\] |
| C. | \[{{I}_{2}}{{O}_{5}}\] |
| D. | \[{{I}_{4}}{{O}_{9}}\] |
| Answer» E. | |
| 5444. |
When \[{{I}_{2}}\] is dissolved in \[CC{{l}_{4}}\], the colour that results is [AFMC 1993] |
| A. | Brown |
| B. | Violet |
| C. | Colourless |
| D. | Bluish green |
| Answer» C. Colourless | |
| 5445. |
A salt, which on heating with conc. \[{{H}_{2}}S{{O}_{4}}\] gives violet vapours, is [CPMT 1971] |
| A. | Iodide |
| B. | Nitrate |
| C. | Sulphate |
| D. | Bromide |
| Answer» B. Nitrate | |
| 5446. |
\[B{{r}^{-}}\] is converted into \[B{{r}_{2}}\] by using [CPMT 1987] |
| A. | \[C{{l}_{2}}\] |
| B. | Conc. \[HCl\] |
| C. | \[HBr\] |
| D. | \[{{H}_{2}}S\] |
| Answer» B. Conc. \[HCl\] | |
| 5447. |
Bromine is obtained commercially from sea water by adding [CPMT 1988] |
| A. | \[AgN{{O}_{3}}\] solution |
| B. | Crystals of \[NaBr\] |
| C. | \[C{{l}_{2}}\] |
| D. | \[{{C}_{2}}{{H}_{4}}\] |
| Answer» D. \[{{C}_{2}}{{H}_{4}}\] | |
| 5448. |
Chlorine was discovered by [BHU 1988] |
| A. | Davy |
| B. | Priestley |
| C. | Rutherford |
| D. | Sheele |
| Answer» B. Priestley | |
| 5449. |
When chlorine is passed over dry slaked lime at room temperature, the main reaction product is [CBSE PMT 1992] |
| A. | \[Ca{{(Cl{{O}_{2}})}_{2}}\] |
| B. | \[CaC{{l}_{2}}\] |
| C. | \[CaOC{{l}_{2}}\] |
| D. | \[Ca{{(OC{{l}_{2}})}_{2}}\] |
| Answer» D. \[Ca{{(OC{{l}_{2}})}_{2}}\] | |
| 5450. |
A gas reacts with \[CaO\], but not with \[NaHC{{O}_{3}}\]. The gas is [AFMC 1987] |
| A. | \[C{{O}_{2}}\] |
| B. | \[C{{l}_{2}}\] |
| C. | \[{{N}_{2}}\] |
| D. | \[{{O}_{2}}\] |
| Answer» C. \[{{N}_{2}}\] | |