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MCQOPTIONS
This section includes 1187 Mcqs, each offering curated multiple-choice questions to sharpen your NEET knowledge and support exam preparation. Choose a topic below to get started.
| 901. |
Assertion: Optically active 2-iodobutane on treatment with NaI in acetone undergoes recemization.Reason: Repeated Walden inversions on the reactant and its product eventually gives a racemic mixture.Read the assertion and reason carefully to mark the correct option out of the options given below: |
| A. | If both assertion and reason are true and the reason is the correct explanation of the assertion. |
| B. | If both assertion and reason are true but reason is not the correct explanation of the assertion. |
| C. | If assertion is true but reason is false. |
| D. | If the assertion and reason both are false. |
| E. | If assertion is false but reason is true. |
| Answer» B. If both assertion and reason are true but reason is not the correct explanation of the assertion. | |
| 902. |
Assertion : Deep electric shock causes death of an animal. Reason : Electric shock coagulate the blood. [AIIMS 1995] |
| A. | If both assertion and reason are true and the reason is the correct explanation of the assertion. |
| B. | If both assertion and reason are true but reason is not the correct explanation of the assertion. |
| C. | If assertion is true but reason is false. |
| D. | If the assertion and reason both are false. |
| E. | If assertion is false but reason is true. |
| Answer» B. If both assertion and reason are true but reason is not the correct explanation of the assertion. | |
| 903. |
Assertion: Addition of \[B{{r}_{2}}\] to cis-but-2-ene is stereoselective. Reason: \[S{{N}^{2}}\] reactions are stereospecific as well as stereoselective.Read the assertion and reason carefully to mark the correct option out of the options given below: |
| A. | If both assertion and reason are true and the reason is the correct explanation of the assertion. |
| B. | If both assertion and reason are true but reason is not the correct explanation of the assertion. |
| C. | If assertion is true but reason is false. |
| D. | If the assertion and reason both are false. |
| E. | If assertion is false but reason is true. |
| Answer» C. If assertion is true but reason is false. | |
| 904. |
Assertion: Aryl halides undergo electrophilic substitutions more readily than benzene.Reason: Aryl halide gives a mixture of o- and p- products.Read the assertion and reason carefully to mark the correct option out of the options given below: |
| A. | If both assertion and reason are true and the reason is the correct explanation of the assertion. |
| B. | If both assertion and reason are true but reason is not the correct explanation of the assertion. |
| C. | If assertion is true but reason is false. |
| D. | If the assertion and reason both are false. |
| E. | If assertion is false but reason is true. |
| Answer» F. | |
| 905. |
Assertion: Electron withdrawing groups in aryl halides decrease the reactivity towards nucleophilic substitution.Reason: 2, 4-Dinitrochlorobenzene is less reactive than chlorobenzene.Read the assertion and reason carefully to mark the correct option out of the options given below: |
| A. | If both assertion and reason are true and the reason is the correct explanation of the assertion. |
| B. | If both assertion and reason are true but reason is not the correct explanation of the assertion. |
| C. | If assertion is true but reason is false. |
| D. | If the assertion and reason both are false. |
| E. | If assertion is false but reason is true. |
| Answer» E. If assertion is false but reason is true. | |
| 906. |
Assertion : An emulsion becomes stable if soap is added to it . Reason : Soap contains hydrophilic and hydrophobic parts. |
| A. | If both assertion and reason are true and the reason is the correct explanation of the assertion. |
| B. | If both assertion and reason are true but reason is not the correct explanation of the assertion. |
| C. | If assertion is true but reason is false. |
| D. | If the assertion and reason both are false. |
| E. | If assertion is false but reason is true. |
| Answer» B. If both assertion and reason are true but reason is not the correct explanation of the assertion. | |
| 907. |
Assertion : Colloidal particles show Brownian movement. Reason : Brownian movement arises because of the impact of the molecules of the dispersion medium with the colloidal particles. |
| A. | If both assertion and reason are true and the reason is the correct explanation of the assertion. |
| B. | If both assertion and reason are true but reason is not the correct explanation of the assertion. |
| C. | If assertion is true but reason is false. |
| D. | If the assertion and reason both are false. |
| E. | If assertion is false but reason is true. |
| Answer» B. If both assertion and reason are true but reason is not the correct explanation of the assertion. | |
| 908. |
Assertion : For the coagulation of sols carrying positive charge, \[PO_{4}^{3-}\] ions are more efficient than \[SO_{4}^{2-}\]or \[C{{l}^{-}}\]ions. Reason : This follows Hardy ? Schulze rule. |
| A. | If both assertion and reason are true and the reason is the correct explanation of the assertion. |
| B. | If both assertion and reason are true but reason is not the correct explanation of the assertion. |
| C. | If assertion is true but reason is false. |
| D. | If the assertion and reason both are false. |
| E. | If assertion is false but reason is true. |
| Answer» B. If both assertion and reason are true but reason is not the correct explanation of the assertion. | |
| 909. |
Read the assertion and reason carefully to mark the correct option out of the options given below: Assertion: Addition of \[B{{r}_{2}}\] to 1-butene gives two optical isomers. Reason: The product contains one asymmetric carbon. [IIT 1998] |
| A. | If both assertion and reason are true and the reason is the correct explanation of the assertion. |
| B. | If both assertion and reason are true but reason is not the correct explanation of the assertion. |
| C. | If assertion is true but reason is false. |
| D. | If the assertion and reason both are false. |
| E. | If assertion is false but reason is true. |
| Answer» B. If both assertion and reason are true but reason is not the correct explanation of the assertion. | |
| 910. |
Read the assertion and reason carefully to mark the correct option out of the options given below: Assertion: 1-Butene on reaction with \[HBr\] in the presence of a peroxide produces 1-bromo-butane. Reason: It involves the free radical mechanism. [IIT-JEE (Screening) 2000] |
| A. | If both assertion and reason are true and the reason is the correct explanation of the assertion. |
| B. | If both assertion and reason are true but reason is not the correct explanation of the assertion. |
| C. | If assertion is true but reason is false. |
| D. | If the assertion and reason both are false. |
| E. | If assertion is false but reason is true. |
| Answer» B. If both assertion and reason are true but reason is not the correct explanation of the assertion. | |
| 911. |
Assertion: Moving phase is liquid and stationary phase is solid in paper chromatography. Reason: Paper chromatography is used for analysis of polar organic compounds. Read the assertion and reason carefully to mark the correct option out of the options given below: |
| A. | If both assertion and reason are true and the reason is the correct explanation of the assertion. |
| B. | If both assertion and reason are true but reason is not the correct explanation of the assertion. |
| C. | If assertion is true but reason is false. |
| D. | If the assertion and reason both are false. |
| E. | If assertion is false but reason is true. |
| Answer» F. | |
| 912. |
Assertion: A mixture of plant pigments can be separated by chromatography. Reason: Chromatography is used for the separation of coloured substances into individual components. Read the assertion and reason carefully to mark the correct option out of the options given below: |
| A. | If both assertion and reason are true and the reason is the correct explanation of the assertion. |
| B. | If both assertion and reason are true but reason is not the correct explanation of the assertion. |
| C. | If assertion is true but reason is false. |
| D. | If the assertion and reason both are false. |
| E. | If assertion is false but reason is true. |
| Answer» C. If assertion is true but reason is false. | |
| 913. |
Assertion : The enthalpy of physisorption is greater than chemisorption. Reason : Molecules of adsorbate and adsorbent are held by van der Waals forces in physisorption and by chemical bonds in chemisorption. |
| A. | If both assertion and reason are true and the reason is the correct explanation of the assertion. |
| B. | If both assertion and reason are true but reason is not the correct explanation of the assertion. |
| C. | If assertion is true but reason is false. |
| D. | If the assertion and reason both are false. |
| E. | If assertion is false but reason is true. |
| Answer» F. | |
| 914. |
Read the assertion and reason carefully to mark the correct option out of the options given below : Assertion : When a finely divided active carbon or clay is stirred into a dilute solution of a dye, the intensity of colour in the solution is decreased. Reason : The dye is adsorbed on the solid surface. |
| A. | If both assertion and reason are true and the reason is the correct explanation of the assertion. |
| B. | If both assertion and reason are true but reason is not the correct explanation of the assertion. |
| C. | If assertion is true but reason is false. |
| D. | If the assertion and reason both are false. |
| E. | If assertion is false but reason is true. |
| Answer» B. If both assertion and reason are true but reason is not the correct explanation of the assertion. | |
| 915. |
Read the assertion and reason carefully to mark the correct option out of the options given below: If both assertion and reason are true and the reason is the correct explanation of the assertion. If both assertion and reason are true but reason is not the correct explanation of the assertion. If assertion is true but reason is false.If the assertion and reason both are false.If assertion is false but reason is trueAssertion: \[S{{O}_{2}}\] and \[C{{l}_{2}}\] both are bleaching agents. Reason: Both are reducing agents. [AIIMS 1995] |
| A. | If both assertion and reason are true and the reason is the correct explanation of the assertion. |
| B. | If both assertion and reason are true but reason is not the correct explanation of the assertion. |
| C. | If assertion is true but reason is false. |
| D. | If the assertion and reason both are false. |
| E. | If assertion is false but reason is true. |
| Answer» D. If the assertion and reason both are false. | |
| 916. |
Assertion: Fluorine exists only in ?1 oxidation state. Reason: Fluorine has \[2{{s}^{2}}2{{p}^{5}}\] configuration. [AIIMS 2001] |
| A. | If both assertion and reason are true and the reason is the correct explanation of the assertion. |
| B. | If both assertion and reason are true but reason is not the correct explanation of the assertion. |
| C. | If assertion is true but reason is false. |
| D. | If the assertion and reason both are false. |
| E. | If assertion is false but reason is true. |
| Answer» C. If assertion is true but reason is false. | |
| 917. |
Hot cone. \[{{H}_{2}}S{{O}_{4}}\] acts as moderately strong oxidizing agent. It oxidises both metals and non-metals. Which of the following element is oxidised by cone. \[{{H}_{2}}S{{O}_{4}}\] in to two gaseous products? |
| A. | Cu |
| B. | S |
| C. | C |
| D. | Zn |
| Answer» D. Zn | |
| 918. |
Ozone on reacting with KI in neutral medium produces |
| A. | \[KI{{O}_{3}}\] |
| B. | \[KOH\] |
| C. | \[KCl\] |
| D. | \[K{{O}_{2}}\] |
| Answer» C. \[KCl\] | |
| 919. |
Which of following represents the correct order of melting point of hydrides of group 16? |
| A. | \[{{H}_{2}}O>{{H}_{2}}S>{{H}_{2}}Se>{{H}_{2}}Te\] |
| B. | \[{{H}_{2}}O>{{H}_{2}}S>{{H}_{2}}Te>{{H}_{2}}Se\] |
| C. | \[{{H}_{2}}O>{{H}_{2}}Te>{{H}_{2}}Se>{{H}_{2}}S\] |
| D. | \[{{H}_{2}}O>{{H}_{2}}Se>{{H}_{2}}Te>{{H}_{2}}S\] |
| Answer» D. \[{{H}_{2}}O>{{H}_{2}}Se>{{H}_{2}}Te>{{H}_{2}}S\] | |
| 920. |
The true statement of the acids of phosphorus \[{{H}_{3}}P{{O}_{2}}\],\[{{H}_{3}}P{{O}_{3}}\] and \[{{H}_{3}}P{{O}_{4}}\] is |
| A. | The order of their reducing strength is \[{{H}_{3}}P{{O}_{2}}>{{H}_{3}}P{{O}_{3}}>{{H}_{3}}P{{O}_{4}}\] |
| B. | the hybridisation of phosphorus is \[s{{p}^{3}}\] in all these. |
| C. | all have one P = O |
| D. | all of these |
| Answer» E. | |
| 921. |
A metal X on heating in nitrogen gas gives Y, Y on treatment with \[{{H}_{2}}O\] gives a colourless gas which when passed through chloroplatinic acid produces yellow precipitate. 'Y' is |
| A. | \[Mg{{(N{{O}_{3}})}_{2}}\] |
| B. | \[M{{g}_{3}}{{N}_{2}}\] |
| C. | \[N{{H}_{3}}\] |
| D. | \[MgO\] |
| Answer» C. \[N{{H}_{3}}\] | |
| 922. |
\[N{{H}_{4}}N{{O}_{3}}\xrightarrow{\Delta }A+{{H}_{2}}O,\] \[N{{H}_{3}}+{{O}_{2}}\xrightarrow{Catalyst}B+{{H}_{2}}O\] \[Pb{{(N{{O}_{3}})}_{2}}\xrightarrow{\Delta }C+PbO+{{O}_{2}}\] Among A, B, and C paramagnetic substance(s) is/are |
| A. | B and C |
| B. | Only B |
| C. | A and C |
| D. | Only A |
| Answer» B. Only B | |
| 923. |
Identify the correct sequence of increasing number of \[\pi \]-bonds in structure of following molecules. (I) \[{{H}_{2}}{{S}_{2}}{{O}_{6}}\] (II)\[{{H}_{2}}S{{O}_{3}}\] (III)\[{{H}_{2}}{{S}_{2}}{{O}_{5}}\] |
| A. | I, II, III |
| B. | II, III, I |
| C. | II, I, III |
| D. | I, III, II |
| Answer» C. II, I, III | |
| 924. |
The compound that attacks Pyrex glass is |
| A. | \[Xe{{F}_{2}}\] |
| B. | \[Xe{{F}_{4}}\] |
| C. | \[Xe{{F}_{6}}\] |
| D. | \[Xe{{F}_{4}}\] |
| Answer» D. \[Xe{{F}_{4}}\] | |
| 925. |
Which one of the following reaction of xenon compounds is not feasible? |
| A. | \[Xe{{O}_{3}}+6HF\to Xe{{F}_{6}}+{{H}_{2}}O\] |
| B. | \[3Xe{{F}_{4}}+6{{H}_{2}}O\to 2Xe+Xe{{O}_{3}}+12HF+1.5{{O}_{2}}\] |
| C. | \[2Xe{{F}_{2}}+2{{H}_{2}}O\to 2Xe+4HF+{{O}_{2}}\] |
| D. | \[Xe{{F}_{6}}+RbF\to Rb[Xe{{F}_{7}}]\] |
| Answer» B. \[3Xe{{F}_{4}}+6{{H}_{2}}O\to 2Xe+Xe{{O}_{3}}+12HF+1.5{{O}_{2}}\] | |
| 926. |
\[{{\left[ HXe{{O}_{4}} \right]}^{-}}=O{{H}^{-}}\to \left[ X \right]+\left[ Y \right]+{{O}_{2}}+{{H}_{2}}O\]The products [X] and [Y] in unbalanced reaction are |
| A. | \[{{\left[ Xe{{O}_{6}} \right]}^{4-}}\]and Xe |
| B. | \[{{\left[ Xe{{O}_{6}} \right]}^{4-}}\]and \[Xe{{O}_{3}}\] |
| C. | \[Xe{{O}_{3}}\] and Xe |
| D. | \[{{H}_{2}}Xe{{O}_{4}}\]and Xe |
| Answer» B. \[{{\left[ Xe{{O}_{6}} \right]}^{4-}}\]and \[Xe{{O}_{3}}\] | |
| 927. |
The number of (\[p\pi \]-\[p\pi \]) \[\pi \]-bonds present in \[Xe{{O}_{3}}\] and \[Xe{{O}_{4}}\] respectively are |
| A. | 3 and 2 |
| B. | 2 and 3 |
| C. | 4 and 2 |
| D. | 3 and 4 |
| Answer» E. | |
| 928. |
Which compound is prepared by the following reaction? \[\underset{(2\,:\,1\,\,\text{volume}\,\,\text{ratio})}{\mathop{Xe\,\,+\,\,\,{{F}_{2}}}}\,\xrightarrow[673K]{Ni}\] (2 :1 volume ratio) |
| A. | \[Xe{{F}_{4}}\] |
| B. | \[Xe{{F}_{2}}\] |
| C. | \[Xe{{F}_{6}}\] |
| D. | None of these |
| Answer» C. \[Xe{{F}_{6}}\] | |
| 929. |
Ammonia and chlorine are made to react. If ammonia is in excess, products formed are A and B. and when chlorine is in excess the products are C and D, A, B, C and D respectively are |
| A. | \[NC{{l}_{3}}\], HCl and \[{{N}_{2}}\], \[N{{H}_{4}}Cl\] |
| B. | \[{{N}_{2}}\], \[N{{H}_{4}}Cl\] and \[NC{{l}_{3}}\], HCl |
| C. | \[{{N}_{2}}\], HCl and \[{{N}_{2}}\], \[N{{H}_{4}}Cl\] |
| D. | \[{{N}_{2}}\], \[N{{H}_{4}}Cl\] and \[NC{{l}_{3}}\], HCl |
| Answer» C. \[{{N}_{2}}\], HCl and \[{{N}_{2}}\], \[N{{H}_{4}}Cl\] | |
| 930. |
Bleaching of a fabric cloth is done using A and excess of chlorine is removed using B. A and B are |
| A. | \[CaOC{{l}_{2}}\], \[N{{a}_{2}}S{{O}_{3}}\] |
| B. | \[N{{a}_{2}}S{{O}_{3}}\],\[CaOC{{l}_{2}}\] |
| C. | \[CaC{{l}_{2}}\], \[N{{a}_{2}}{{S}_{2}}{{O}_{3}}\] |
| D. | \[CaOC{{l}_{2}}\], \[N{{a}_{2}}{{S}_{2}}{{O}_{2}}\] |
| Answer» E. | |
| 931. |
Regarding the properties of hydrogen halides, which is wrong order? |
| A. | Percentage of ionic character HF>HI>HBr>HCl |
| B. | Boiling point order HF > HI > HBr > HCl |
| C. | Acidic nature HI > HBr > HCl > HF |
| D. | Melting point order HI > HF > HBr > HCl |
| Answer» B. Boiling point order HF > HI > HBr > HCl | |
| 932. |
In \[S{{O}_{3}}\] molecule, 3 oxygen atoms are attached to sulphur atom through double bonds. Hence, the molecules consist \[3\pi \]-bonds. The types of pi-bonds present in \[S{{O}_{3}}\] molecule are |
| A. | All \[p\pi \]-\[p\pi \] bonds |
| B. | one \[p\pi \]-\[p\pi \] and two \[p\pi \]-\[p\pi \] bonds. |
| C. | one \[p\pi \]-\[p\pi \] and one \[p\pi \]-\[p\pi \] bonds |
| D. | two \[p\pi \]-\[p\pi \] and one \[p\pi \]-\[p\pi \] bonds |
| Answer» E. | |
| 933. |
Arrange the group 15 hydrides in the increasing order of H-M-H bond angle. |
| A. | \[Sb{{H}_{3}}<As{{H}_{3}}<P{{H}_{3}}<N{{H}_{3}}\] |
| B. | \[N{{H}_{3}}<P{{H}_{3}}<As{{H}_{3}}<Sb{{H}_{3}}\] |
| C. | \[N{{H}_{3}}<Sb{{H}_{3}}<As{{H}_{3}}<P{{H}_{3}}\] |
| D. | \[N{{H}_{3}}<P{{H}_{3}}<Sb{{H}_{3}}<As{{H}_{3}}\] |
| Answer» B. \[N{{H}_{3}}<P{{H}_{3}}<As{{H}_{3}}<Sb{{H}_{3}}\] | |
| 934. |
Read the assertion and reason carefully to mark the correct option out of the options given below: Assertion: Halogenation of alkanes is catalysed by tetraethyl lead. Reason: Halogenation proceeds through free radical mechanism. |
| A. | If both assertion and reason are true and the reason is the correct explanation of the assertion. |
| B. | If both assertion and reason are true but reason is not the correct explanation of the assertion. |
| C. | If assertion is true but reason is false. |
| D. | If the assertion and reason both are false. |
| Answer» E. | |
| 935. |
Assertion: Aqueous hydrohalogen acids are used to prepare alkyl halides from alkenes.Reason: Hydrogen iodide readily reacts with alkenes to form alkyl halides.Read the assertion and reason carefully to mark the correct option out of the options given below: |
| A. | If both assertion and reason are true and the reason is the correct explanation of the assertion. |
| B. | If both assertion and reason are true but reason is not the correct explanation of the assertion. |
| C. | If assertion is true but reason is false. |
| D. | If the assertion and reason both are false. |
| Answer» E. | |
| 936. |
Assertion: For a reaction \[{{H}_{2}}(g)+{{I}_{2}}(g)\] ⇌ \[2HI(g)\] if the volume of vessel is reduced to half of its original volume, equilibrium constant will be doubled. Reason: According to Le-Chatelier principle, reaction shifts in a direction that tends to undo the effect of the stress. Read the assertion and reason carefully to mark the correct option out of the options given below: |
| A. | If both assertion and reason are true and the reason is the correct explanation of the assertion. |
| B. | If both assertion and reason are true but reason is not the correct explanation of the assertion. |
| C. | If assertion is true but reason is false. |
| D. | If the assertion and reason both are false. |
| Answer» E. | |
| 937. |
Assertion: \[S{{O}_{2}}(g)+\frac{1}{2}{{O}_{2}}(g)\]⇌\[S{{O}_{3}}(g)+\] heat. Forward reaction is favoured at high temperature and low pressure. Reason: Reaction is exothermic. Read the assertion and reason carefully to mark the correct option out of the options given below: |
| A. | If both assertion and reason are true and the reason is the correct explanation of the assertion. |
| B. | If both assertion and reason are true but reason is not the correct explanation of the assertion. |
| C. | If assertion is true but reason is false. |
| D. | If the assertion and reason both are false. |
| Answer» E. | |
| 938. |
Assertion: For the reaction, \[2N{{H}_{3}}(g)\]⇌ \[{{N}_{2}}(g)\] \[+3{{H}_{2}}(g)\], the unit of \[{{K}_{p}}\] will be atm. Reason: Unit of \[{{K}_{p}}\] is \[{{(atm)}^{\Delta n}}\]. Read the assertion and reason carefully to mark the correct option out of the options given below: |
| A. | If both assertion and reason are true and the reason is the correct explanation of the assertion. |
| B. | If both assertion and reason are true but reason is not the correct explanation of the assertion. |
| C. | If assertion is true but reason is false. |
| D. | If the assertion and reason both are false. |
| Answer» E. | |
| 939. |
Assertion: Electrical conductivity of copper increases with increase in temperature. Reason: The electrical conductivity of metals is due to the motion of electrons. Read the assertion and reason carefully to mark the correct option out of the options given below: |
| A. | If both assertion and reason are true and the reason is the correct explanation of the assertion. |
| B. | If both assertion and reason are true but reason is not the correct explanation of the assertion. |
| C. | If assertion is true but reason is false. |
| D. | If the assertion and reason both are false. |
| Answer» E. | |
| 940. |
Assertion: A negative value of standard reduction potential means that reduction take place on this electrode with reference to standard hydrogen electrode. Reason: The standard electrode potential of a half cell has a fixed value. Read the assertion and reason carefully to mark the correct option out of the options given below: |
| A. | If both assertion and reason are true and the reason is the correct explanation of the assertion. |
| B. | If both assertion and reason are true but reason is not the correct explanation of the assertion. |
| C. | If assertion is true but reason is false. |
| D. | If the assertion and reason both are false. |
| Answer» E. | |
| 941. |
For complete combustion of ethanol, \[{{C}_{2}}{{H}_{5}}OH\left( l \right)+3{{O}_{2}}\left( g \right)\xrightarrow{{}}2C{{O}_{2}}\left( g \right)+3{{H}_{2}}O\left( l \right),\] the amount of heat produced as measured in bomb calorimeter, is \[1364.47\text{ }kJ\text{ }mo{{l}^{-1}}\] at\[25{}^\circ C\]. Assuming ideality the enthalpy of combustion, \[{{\Delta }_{c}}H\], for the reaction will be: \[\left( R=8.314\text{ }kJ\,mo{{l}^{-1}} \right)\] |
| A. | \[-1366.95\text{ }kJ\text{ }mo{{l}^{-1}}\] |
| B. | \[-1361.95\text{ }kJ\,mo{{l}^{-1}}\] |
| C. | \[-1460.95\text{ }kJ\,mo{{l}^{-1}}\] |
| D. | \[-1350.50\text{ }kJ\,mo{{l}^{-1}}\] |
| Answer» B. \[-1361.95\text{ }kJ\,mo{{l}^{-1}}\] | |
| 942. |
Equal volumes of methanoic acid and sodium hydroxide are mixed. If x is the heat of formation of water, then heat evolved on neutralization is |
| A. | more than x |
| B. | equal to x |
| C. | less than x |
| D. | twice x. |
| Answer» D. twice x. | |
| 943. |
For the reaction\[{{C}_{3}}{{H}_{8}}(g)+5{{O}_{2}}(g)\to 3C{{O}_{2}}(g)+4{{H}_{2}}O(l)\] at constant temperature, \[\Delta H-\Delta E\] is |
| A. | \[-RT\] |
| B. | \[+RT\] |
| C. | \[-3\text{ }RT\] |
| D. | \[+3\text{ }RT\] |
| Answer» D. \[+3\text{ }RT\] | |
| 944. |
For which of the following process, \[\Delta S\] is negative? |
| A. | \[{{H}_{2}}\left( g \right)\xrightarrow{{}}2H\left( g \right)\] |
| B. | \[2S{{O}_{3}}\left( g \right)\xrightarrow{{}}2S{{O}_{2}}\left( g \right)+{{O}_{2}}\left( g \right)\] |
| C. | \[{{N}_{2}}(4l)\xrightarrow{compressed}{{N}_{2}}(2l)\] |
| D. | \[C\left( diamond \right)\xrightarrow{{}}C\left( graphite \right)\] |
| Answer» D. \[C\left( diamond \right)\xrightarrow{{}}C\left( graphite \right)\] | |
| 945. |
The heat of atomization of \[P{{H}_{3}}(g)\] is \[228\text{ }kcal\text{ }mo{{l}^{-1}}\] and that of \[{{P}_{2}}{{H}_{4}}(g)\] is\[335\text{ }kcal\text{ }mo{{l}^{-1}}\]. The energy of the P-P bond is |
| A. | \[102\text{ }kcal\text{ }mo{{l}^{-1}}\] |
| B. | \[51\text{ }kcal\text{ }mo{{l}^{-1}}\] |
| C. | \[26\text{ }kcal\text{ }mo{{l}^{-1}}\] |
| D. | \[204\text{ }kcal\text{ }mo{{l}^{-1}}\] |
| Answer» C. \[26\text{ }kcal\text{ }mo{{l}^{-1}}\] | |
| 946. |
Which of the following pairs of processes is certain to occur in a spontaneous chemical reaction? |
| A. | Exothermic and increasing disorder |
| B. | Exothermic and decreasing disorder |
| C. | Endothermic and increasing disorder |
| D. | Endothermic and decreasing disorder |
| Answer» B. Exothermic and decreasing disorder | |
| 947. |
Combustion of sucrose is used by aerobic organisms for providing energy for the life sustaining processes. If all the capturing of energy from the reaction is done through electrical process (non P-V work) then calculate maximum available energy which can be captured by combustion of 34.2 g of sucrose Given: \[\Delta {{H}_{combustion}}\left( sucrose \right)=-\text{ }6000\text{ }kJ\text{ }mo{{l}^{-1}}\] \[\Delta {{S}_{combustion}}=180J/Kmol\] and body temperature is 300 K |
| A. | 600 kJ |
| B. | 594.6 kJ |
| C. | 5.4 kJ |
| D. | 605.4 kJ |
| Answer» E. | |
| 948. |
The enthalpy of hydrogenation of cyclohexene is\[-119.5\text{ }kJ\text{ }mo{{l}^{-1}}\]. If resonance energy of benzene is\[-150.4\text{ }kJ\text{ }mo{{l}^{-1}}\], its enthalpy of hydrogenation would be |
| A. | \[-208.1kg\text{ }mo{{l}^{-1}}\] |
| B. | \[-269.9\text{ }kg\text{ }mo{{l}^{-1}}\] |
| C. | \[-358.5\text{ }kg\text{ }mo{{l}^{-1}}\] |
| D. | \[-508.9\text{ }kg\text{ }mo{{l}^{-1}}\] |
| Answer» B. \[-269.9\text{ }kg\text{ }mo{{l}^{-1}}\] | |
| 949. |
The species which by definition has zero standard molar enthalpy of formation at \[298K\] is |
| A. | \[B{{r}_{2}}(g)\] |
| B. | \[C{{l}_{2}}(g)\] |
| C. | \[{{H}_{2}}O\left( g \right)\] |
| D. | \[C{{H}_{4}}(g)\] |
| Answer» C. \[{{H}_{2}}O\left( g \right)\] | |
| 950. |
A gas undergoes change from state A to state B. In this process, the heat absorbed and work done by the gas is 5 J and 8 J, respectively. Now gas is brought back to A by another process during which 3 J of heat is evolved. In this reverse process of B to A: |
| A. | \[10\text{ }J\] of the work will be done by the gas. |
| B. | \[6\text{ }J\] of the work will be done by the gas. |
| C. | \[10\text{ }J\] of the work will be done by the surrounding on gas. |
| D. | \[6\text{ }J\] of the work will be done by the surrounding on gas. |
| Answer» E. | |