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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.
| 3701. |
When 10 ml of 0.1 M acetic acid (\[p{{K}_{a}}\]. = 5.0) is titrated against 10ml of 0.l Mammonia solution (\[p{{K}_{b}}\]=5.0), the equivalence point occurs at pH |
| A. | 5.0 |
| B. | 6 |
| C. | 7.0 |
| D. | 9 |
| Answer» D. 9 | |
| 3702. |
The pH of a buffer is 6.745. When 0.01 mole of NaOH is added to 1 litre of it, the pH changes to 6.832. Its buffer capacity is |
| A. | 0.187 |
| B. | 0.115 |
| C. | 0.076 |
| D. | 0.896 |
| Answer» C. 0.076 | |
| 3703. |
Calculate the amount of\[{{(N{{H}_{4}})}_{2}}S{{O}_{4}}\]in grams which must be added to 500 ml of 0.2 M \[N{{H}_{3}}\], to yield a solution of pH=9, \[{{K}_{b}}\]for \[N{{H}_{3}}=2\times {{10}^{-5}}\] |
| A. | 3.248 g |
| B. | 4.248 g |
| C. | 1.320 g |
| D. | 6.248 g |
| Answer» D. 6.248 g | |
| 3704. |
Silver nitrate solution is gradually added to an aqueous solution containing 0.01 M each of chloride, bromide and iodide ions. The correct sequence in which the halides will be preacipitated is: |
| A. | Bromide, chloride, iodide |
| B. | Iodide, chloride, bromide |
| C. | Iodide, bromide, chloride |
| D. | Bromide, chloride |
| Answer» D. Bromide, chloride | |
| 3705. |
At its melting point ice is lighter than water because |
| A. | \[{{H}_{2}}O\]molecules are more closely packed in solid state |
| B. | Ice crystals have hollow hexagonal arrangement of \[{{H}_{2}}O\]molecules |
| C. | On melting of ice the \[{{H}_{2}}O\]molecule shrinks in size |
| D. | Ice forms mostly heavy water on first melting |
| Answer» C. On melting of ice the \[{{H}_{2}}O\]molecule shrinks in size | |
| 3706. |
Hydrogen peroxide is now generally prepared on industrial scale by the |
| A. | action of \[{{H}_{2}}S{{O}_{4}}\]on barium peroxide |
| B. | action of \[{{H}_{2}}S{{O}_{4}}\]on sodium peroxide |
| C. | electrolysis of 50% \[{{H}_{2}}S{{O}_{4}}\] |
| D. | burning hydrogen in excess of oxygen |
| Answer» D. burning hydrogen in excess of oxygen | |
| 3707. |
Lead pipes are not used for carrying drinking water because |
| A. | They are covered with a coating of lead carbonate |
| B. | They are corroded by air and moisture |
| C. | Water containing dissolved air attacks lead forming soluble hydroxide |
| D. | None of these |
| Answer» D. None of these | |
| 3708. |
Which of the following statements about \[{{H}_{2}}{{O}_{2}}\]is not true? |
| A. | \[{{H}_{2}}{{O}_{2}}\]Is used to clean oil paintings |
| B. | \[{{H}_{2}}{{O}_{2}}\]Acts as oxidizing as well as reducing agent |
| C. | Two hydroxyl groups in \[{{H}_{2}}{{O}_{2}}\]lie in the same plane |
| D. | None of these |
| Answer» D. None of these | |
| 3709. |
Out of the following metals which will give \[{{H}_{2}}\] on reaction with NaOH?I: Zn, II: Mg,III: Al, IV: Be |
| A. | I, II, III, IV |
| B. | I, II, IV |
| C. | II, IV |
| D. | I, III |
| Answer» C. II, IV | |
| 3710. |
Bosch method for the manufacture of hydrogen gas uses |
| A. | reaction of red hot coke with steam |
| B. | reaction of red hot iron followed by reduction of \[F{{e}_{3}}{{O}_{4}}\]with syn gas |
| C. | coal gasification followed by water-gas shift reaction |
| D. | steam reforming process |
| Answer» D. steam reforming process | |
| 3711. |
When electric current is passed through an hydride in the molten state, |
| A. | hydrogen is liberated at the cathode |
| B. | hydrogen is liberated at anode |
| C. | hydride ion migrates towards cathode |
| D. | no reaction takes place |
| Answer» C. hydride ion migrates towards cathode | |
| 3712. |
Polyphosphates are used as water softening agents because |
| A. | form soluble complexes anionic species |
| B. | precipitate anionic species |
| C. | from soluble complexes with cationic species |
| D. | precipitate cationic species |
| Answer» D. precipitate cationic species | |
| 3713. |
The molecular formula of a commercial resin used for exchanging ions in water softening is \[{{C}_{8}}{{H}_{7}}S{{O}_{3}}Na\](mol. Wt. 206). What would be the maximum uptake of \[C{{a}^{2+}}\]ions by the resin when expressed in mole per gram resin? |
| A. | \[\frac{1}{103}\] |
| B. | \[\frac{1}{206}\] |
| C. | \[\frac{2}{309}\] |
| D. | \[\frac{1}{412}\] |
| Answer» E. | |
| 3714. |
The hair dyes available in the market generally contain two bottles, one containing the dye and the other hydrogen peroxide. Before applying the dye, the two solutions are mixed. The hydrogen peroxide |
| A. | is added to dilute the solution of the dye |
| B. | acidifies the solution of the day |
| C. | reduces the dye to give the desired colour |
| D. | oxidizes the dye to give the desired colour |
| Answer» E. | |
| 3715. |
There are three samples of \[{{H}_{2}}{{O}_{2}}\]labelled as 10 vol; 15 vol; 20 vol; Half litre of each sample is mixed and then diluted with equal volume of water. Calculate volume strength of the resultant solution. |
| A. | 1.339 |
| B. | 7.5 |
| C. | 5.0 |
| D. | 2.68 |
| Answer» C. 5.0 | |
| 3716. |
Chemical (A) is used for water softening to remove temporary hardness. (A) reacts with sodium carbonate to generate caustic soda. When \[C{{O}_{2}}\]is bubbled through a solution of (A), it truns cloudy. What is the chemical formula of (A)? |
| A. | \[CaC{{O}_{3}}\] |
| B. | \[CaO\] |
| C. | \[Ca{{(OH)}_{2}}\] |
| D. | \[Ca{{(HC{{O}_{3}})}_{2}}\] |
| Answer» D. \[Ca{{(HC{{O}_{3}})}_{2}}\] | |
| 3717. |
The exhausted permutit is generally regenerated by percolating through it a solution of |
| A. | sodium chloride |
| B. | calcium chloride |
| C. | magnesium chloride |
| D. | Water containing plum juice |
| Answer» B. calcium chloride | |
| 3718. |
100 mL of tap water containing Ca\[{{(HC{{O}_{3}})}_{2}}\], was titrated with \[N/50\text{ }HCl\] with methyl orange as indicator. If 30 mL of HCI were requireil. calculate the temporary hardness as part of \[CaC{{O}_{3}}\]per \[{{10}^{6}}\]parts of water. |
| A. | 150 ppm |
| B. | 600 ppm |
| C. | 450 ppm |
| D. | 300 ppm |
| Answer» E. | |
| 3719. |
The pair that yields the same gaseous product on reaction with water: |
| A. | K and \[K{{O}_{2}}\] |
| B. | Ca and \[Ca{{H}_{2}}\] |
| C. | Na and \[N{{a}_{2}}{{O}_{2}}\] |
| D. | Ba and \[Ba{{O}_{2}}\] |
| Answer» C. Na and \[N{{a}_{2}}{{O}_{2}}\] | |
| 3720. |
An optically active alkyl bromide X (\[{{C}_{6}}{{H}_{13}}Br\]) upon treatment with ethanolic KOH solution forms two alkenes Y and Z with their molecular formula (\[{{C}_{6}}{{H}_{12}}\]). Y and Z are positional isomers. Z upon treatment with cold, dilute alkaline \[KMn{{O}_{4}}\] solution gives a meso-diol. Hence, X is |
| A. | 2-bromohexane |
| B. | 1-bromo-2, 3-dimethyl butane |
| C. | 3-bromohexane |
| D. | 2-bromo-2, 3-dimethyl butane |
| Answer» D. 2-bromo-2, 3-dimethyl butane | |
| 3721. |
\[B\,\,\xleftarrow[Catalyst]{Lindlar's}R-C\equiv C-R\xrightarrow{Na/N{{H}_{3}}}A\] A and B are geometrical isomres \[\left( R-CH-=CH-R \right)-\] |
| A. | A is trans, B is cis |
| B. | A and B both are cis |
| C. | A and B both are trans |
| D. | A is cis, B is trans |
| Answer» B. A and B both are cis | |
| 3722. |
An alkane (X) with its molecular formula \[{{C}_{6}}{{H}_{14}}\] can be obtained by reduction of only two isomeric alky1 chlorides (excluding stereoisomers) \[{{C}_{6}}{{H}_{13}}Cl\] with Zn acid. The alkyi chlorides are |
| A. | 2-chloro-4-methyl pentane and 3-chloro-2-methyl pentane |
| B. | 3, 3-dimethyl-1-chlorobutane and 2, 2-dimethyl-3- chlorobutane |
| C. | 2, 3-dimethyl-1-chlorobutane and 2-chloro-2, 3-dimethyl butane |
| D. | 2-chlorohexane and 3-chlorohexane |
| Answer» D. 2-chlorohexane and 3-chlorohexane | |
| 3723. |
Identify the incorrect statement/statements: (i) Alkynes are more reactive than alkenes towards electrophilic addition reaction (ii) Alkynes are less reactive than alkenes towards electrophilic addition reaction (iii) Alkynes decolourise \[B{{r}_{2}}\] water (iv) Addition of HBr to alkynes in presence of peroxide proceeds via Markownikoff's rule |
| A. | (i) and (ii) |
| B. | (ii) and (iii) |
| C. | (i) and (iv) |
| D. | (ii) and (iv) |
| Answer» D. (ii) and (iv) | |
| 3724. |
Arrange the following compounds in decreasing order of rate of electrophilic addition reaction. |
| A. | Q>S>P>R |
| B. | S>Q>R>P |
| C. | P>Q>R>S |
| D. | R>Q>S>P |
| Answer» C. P>Q>R>S | |
| 3725. |
\[{{R}_{1}}\]and \[{{R}_{2}}\] are |
| A. | Cold alkaline \[KMn{{O}_{4}},Os{{O}_{4}}/{{H}_{2}}{{O}_{2}}\] |
| B. | Cold alkaline \[KMn{{O}_{4}},\]\[HC{{O}_{3}}H\] and \[{{H}_{3}}{{O}^{+}}\] |
| C. | Cold alkaline \[KMn{{O}_{4}}.\]\[{{C}_{6}}{{H}_{5}}C{{O}_{3}}H\] |
| D. | \[{{C}_{6}}{{H}_{5}}C{{O}_{3}}H,\,HC{{O}_{3}}H\] |
| Answer» C. Cold alkaline \[KMn{{O}_{4}}.\]\[{{C}_{6}}{{H}_{5}}C{{O}_{3}}H\] | |
| 3726. |
An alkane \[{{C}_{6}}{{H}_{14}}(X)\] can be obtained by reduction of five different alkyl halides \[{{C}_{6}}{{H}_{13}}Cl\] (only structural isomers) with\[ZnC{{H}_{3}}COOH\]. The IUPAC name of X satisfying above condition is |
| A. | hexane |
| B. | 2-methyl pentane |
| C. | 2, 3-dimethyl butane |
| D. | 2, 2-dimethyl butane |
| Answer» C. 2, 3-dimethyl butane | |
| 3727. |
Poling process is used |
| A. | for the removal of \[C{{u}_{2}}O\] from Cu |
| B. | for the removal of \[A{{l}_{2}}{{O}_{3}}\] from Al |
| C. | for the removal of \[F{{e}_{2}}{{O}_{3}}\] from Fe |
| D. | In all the above |
| Answer» B. for the removal of \[A{{l}_{2}}{{O}_{3}}\] from Al | |
| 3728. |
Sulphide ores of metals are usually concentrated by froth floatation process. Which one of the following sulphide ores offers an exception and is concentrated by leaching? |
| A. | Sphalerite |
| B. | Galena |
| C. | Argentite |
| D. | Copper pyrites |
| Answer» D. Copper pyrites | |
| 3729. |
Wolframite (\[FeW{{O}_{4}}\]) impurities present in cassiterite (\[Sn{{O}_{2}}\]) can be separated by the process of |
| A. | froth floatation |
| B. | zone refining |
| C. | electromagnetic separation |
| D. | gravity separation |
| Answer» B. zone refining | |
| 3730. |
Flux is often added to remove impurities from an iron ore in a blast furnace. In the reactions slag and flux are |
| A. | \[CaSi{{O}_{3}}\] and \[Si{{O}_{2}}\] |
| B. | \[CaO\] and \[Si{{O}_{3}}\] |
| C. | \[CaSi{{O}_{3}}\] and \[CaO\] |
| D. | \[Si{{O}_{2}}\] and \[CaSi{{O}_{3}}\] |
| Answer» D. \[Si{{O}_{2}}\] and \[CaSi{{O}_{3}}\] | |
| 3731. |
Which one of the following ores is concentrated by chemical leaching method? |
| A. | Argentite |
| B. | Copper pyrite |
| C. | Cinnabar |
| D. | Galena |
| Answer» B. Copper pyrite | |
| 3732. |
The main reaction occurring in blast furnace during the extraction of iron from haematite is |
| A. | \[F{{e}_{2}}{{O}_{3}}+3C\to 2Fe+3CO\] |
| B. | \[FeO+Si{{O}_{2}}\to FeSi{{O}_{3}}\] |
| C. | \[F{{e}_{2}}{{O}_{3}}+3CO\to 2Fe+3C{{O}_{2}}\] |
| D. | \[CaO+Si{{O}_{2}}\to CaSi{{O}_{3}}\] |
| Answer» D. \[CaO+Si{{O}_{2}}\to CaSi{{O}_{3}}\] | |
| 3733. |
Which series of reactions correctly chemical reactions related to iron and its compound |
| A. | \[Fe\xrightarrow{C{{l}_{2}},\,heat}FeC{{l}_{2}}\xrightarrow{heat,air}FeC{{l}_{2}}\xrightarrow{Zn}Fe\] |
| B. | \[Fe\xrightarrow{{{O}_{2}},\,heat}F{{e}_{2}}{{O}_{4}}\xrightarrow{CO,{{600}^{0}}C}FeC{{l}_{3}}\xrightarrow{CO,{{700}^{0}}C}Fe\] |
| C. | \[Fe\xrightarrow{dil,{{H}_{2}}S{{O}_{4}}}Fe{{O}_{4}}\xrightarrow{{{H}_{2}}S{{O}_{4}},{{O}_{2}}}Fe{{(S{{O}_{4}})}_{3}}\xrightarrow{heat}Fe\] |
| D. | \[Fe\xrightarrow{{{O}_{2}},heat}FeO\xrightarrow{dil,{{H}_{2}}S{{O}_{4}}}FeS{{O}_{4}}\xrightarrow{heat}Fe\] |
| Answer» C. \[Fe\xrightarrow{dil,{{H}_{2}}S{{O}_{4}}}Fe{{O}_{4}}\xrightarrow{{{H}_{2}}S{{O}_{4}},{{O}_{2}}}Fe{{(S{{O}_{4}})}_{3}}\xrightarrow{heat}Fe\] | |
| 3734. |
In the context of the Hall-Heroult process for the extraction of Al, which of the following statements is false? |
| A. | CO and \[C{{O}_{2}}\] are produced in this process |
| B. | \[A{{l}_{2}}{{O}_{3}}\] is mixed with \[Ca{{F}_{2}}\] which lowers the melting point of the mixture and brings conductivity |
| C. | \[A{{l}^{3+}}\] is reduced at the cathode to form Al |
| D. | \[N{{a}_{3}}AI{{F}_{6}}\] Serves as the electrolyte |
| Answer» E. | |
| 3735. |
Roasting of sulphides gives the gas X as a by-product. This is a colorless gas produce choking smell of burnt sulphur, and causes great damage to respiratory organs as a result of acid rain. Its aqueous solution is acidic and acts as a reducing agent and it has never been isolated. The gas X is |
| A. | \[S{{O}_{2}}\] |
| B. | \[C{{O}_{2}}\] |
| C. | \[S{{O}_{3}}\] |
| D. | \[{{H}_{2}}S\] |
| Answer» B. \[C{{O}_{2}}\] | |
| 3736. |
In aluminum extraction by the Bayer's process, alumina is extracted from bauxite by sodium hydroxide at high temperature and pressures. \[A{{l}_{2}}{{O}_{3}}(s)+2O{{H}^{-}}(aq)\to 2A{{l}^{-}}_{2}(aq)+{{H}_{2}}O(\ell )\] Solid impurities such as \[F{{e}_{2}}{{O}_{3}}\] and \[Si{{O}_{2}}\] are removed and then Al\[{{(OH)}^{-}}_{4}\] is reprecipitated. \[Al{{(OH)}^{-}}_{4}\to A{{l}_{2}}{{O}_{3}}\cdot 2{{H}_{2}}O(s)+2O{{H}^{-}}(aq)\] In the industrial world |
| A. | carbon dioxide is added to precipitate the alumina |
| B. | Temperature and pressure are dropped and the super- saturated solution is seeded |
| C. | both [a] and [b] are practiced |
| D. | the water is evaporated. |
| Answer» D. the water is evaporated. | |
| 3737. |
Consider the following reactions at\[1000{}^\circ C\]. \[Zn(s)+\frac{1}{2}{{O}_{2}}(g)\to ZnO(g);\,\Delta {{G}^{o}}=-360\,kJ/mol\] \[C(s)+\frac{1}{2}{{O}_{2}}(g)\to CO(g);\,\Delta {{G}^{o}}=-400\,kJ/mol\] Choose the correct statement at \[1000{}^\circ C\]. |
| A. | Zinc can be oxidized by CO |
| B. | Zinc oxide can be reduced by C |
| C. | Both statements [a] and [b] are true |
| D. | Both statements [a] and [b] are false |
| Answer» C. Both statements [a] and [b] are true | |
| 3738. |
Which of the following statements is correct regarding the slag obtained during the extraction of a metal like copper or iron? |
| A. | The slag is lighter and has lower melting point than the metal |
| B. | The slag is heavier and has lower melting point than the metal |
| C. | The slag is lighter and has higher melting point than the metal |
| D. | The slag is heavier and has higher melting point than the metal |
| Answer» B. The slag is heavier and has lower melting point than the metal | |
| 3739. |
Copper matte is extracted from copper pyrites ore b) heating it in blast furnace. The method is based on the principle that: |
| A. | copper has more affinity for oxygen than sulphur at high temperature |
| B. | iron has less affinity for oxygen than sulphur at high temperature |
| C. | sulphur has less affinity for oxygen at high temperatun |
| D. | copper has less affinity for oxygen than sulphur at high temperature |
| Answer» E. | |
| 3740. |
In zone refining, pure metal is obtained at the |
| A. | Right end, if zone is travelling from left to right |
| B. | Left end, if zone is travelling from left to right |
| C. | Left end, if zone is travelling from right to left |
| D. | Centre, if zone is travelling from any side |
| Answer» C. Left end, if zone is travelling from right to left | |
| 3741. |
In which of the following pair of metals, both are commercially extracted from their respective ores by self- reduction method? |
| A. | Zn, Cu |
| B. | Pb, Cu |
| C. | Sn, Zn |
| D. | Al, Ag |
| Answer» C. Sn, Zn | |
| 3742. |
Consider the following diseases from which human being are suffered, (I) Asthma (II) Dyspepsia (III) Bronchitis (IV) Emphysema Diseases due to \[S{{O}_{2}}\] are |
| A. | I, III and IV |
| B. | II, III and IV |
| C. | I, II and III |
| D. | Both I and IV |
| Answer» B. II, III and IV | |
| 3743. |
Consider the following equilibrium, \[Hb{{O}_{2}}+CO\rightleftharpoons HbCO+{{O}_{2}}\] When [HbCO] = 3%, to 4% oxygen carrying capacity of blood is |
| A. | increased |
| B. | remains unchanged |
| C. | decreased |
| D. | can't be predicted |
| Answer» D. can't be predicted | |
| 3744. |
Consider the following statement and select the correct option:\[{{S}_{1}}\]: Dust is the non-viable particle.\[{{S}_{2}}\]: Particulates acquire negative charge and are attracte by the positive electrode.\[{{S}_{3}}\]: \[{{O}_{2}}\] is a greenhouse gas.\[{{S}_{4}}\]: Algae is a viable particulate. |
| A. | \[{{S}_{1}}\] and \[{{S}_{2}}\] only |
| B. | \[S{{ }_{1}},\,\,{{S}_{2}}\] and \[{{S}_{3}}\] only |
| C. | \[S{{ }_{1}},\,\,{{S}_{2}}\] and \[{{S}_{4}}\] only |
| D. | \[S{{ }_{2}},\,\,{{S}_{3}}\] and \[{{S}_{4}}\] |
| Answer» D. \[S{{ }_{2}},\,\,{{S}_{3}}\] and \[{{S}_{4}}\] | |
| 3745. |
Select the correct statement(s). |
| A. | Above the troposphere, between 10 and 50 km above sea level lies stratosphere |
| B. | Troposphere is a turbulent, dusty zone containing air, much water vapours and cloud formation |
| C. | Stratosphere contains \[{{N}_{2}},\] \[{{O}_{2}}\] and \[{{O}_{3}}\] and little water vapours |
| D. | All of the above are correct statements |
| Answer» E. | |
| 3746. |
\[S{{O}_{2}}\] can be removed by using the following\[S{{O}_{2}}+2{{H}_{2}}S\to 2{{H}_{2}}O+3S\]\[S{{O}_{2}}+N{{a}_{2}}S{{O}_{3}}+{{H}_{2}}O\to 2NaHS{{O}_{3}}\]This is called |
| A. | synergistic process |
| B. | non-regenerative process |
| C. | desulphonation process |
| D. | regenerative process |
| Answer» E. | |
| 3747. |
The chemical entities present in thermosphere of the atmosphere are |
| A. | \[{{O}^{+2}},{{O}^{+}},N{{O}^{+}}\] |
| B. | \[{{O}_{3}}\] |
| C. | \[{{N}_{2}},{{O}_{2}},C{{O}_{2}},{{H}_{2}}O\] |
| D. | \[{{O}_{3}},{{O}^{+}}_{2},{{O}_{2}}\] |
| Answer» B. \[{{O}_{3}}\] | |
| 3748. |
\[S{{O}_{2}}\] as pollutant can be controlled by (I) using solar energy, nuclear energy, hydroelectric energy. (II) low sulphur fuels, natural gas. (Ill) desulphonation of high sulphur coal and oil before burning by FGD. (IV) using water under high pressure. Correct methods are |
| A. | Both I and II |
| B. | Both I and III |
| C. | I, II and IV |
| D. | I, II and III |
| Answer» E. | |
| 3749. |
Oxides of sulphur and nitrogen can be removed by scrubbing with |
| A. | \[Ca{{(OH)}_{2}}\] |
| B. | \[{{H}_{2}}S{{O}_{4}}\] |
| C. | Both [a] and [b] |
| D. | None of these |
| Answer» D. None of these | |
| 3750. |
The concentration of fluoride, lead, nitrate and iron in a water sample from an underground lake was found to be 1000 ppb, 40 ppb, 100 ppm and 0.2 ppm, respectively. This water is unsuitable for drinking due to high concentration of |
| A. | Iron |
| B. | Fluoride |
| C. | Lead |
| D. | Nitrate |
| Answer» E. | |