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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.
| 1001. |
A He atom at 300 K is released from the surface of the earth to travel upwards. Assuming that it undergoes no collision with other molecules, how high will it be before coming to the rest? |
| A. | 9.53 m |
| B. | 95.3 m |
| C. | 953 m |
| D. | \[9.53\times {{10}^{4}}m\] |
| Answer» E. | |
| 1002. |
Benzene freezes at \[5.50{}^\circ C\]. If the freezing point of 2.48 g of phosphorous in 100 g benzene is \[4.48{}^\circ C\], the atomicity of phosphorus in benzene is (\[{{K}_{f}}\](benzene)\[=5.12\,K\,kgmo{{l}^{-1}}\]): |
| A. | 1 |
| B. | 3 |
| C. | 4 |
| D. | 8 |
| Answer» D. 8 | |
| 1003. |
A living cell contains a solution which is isotonic with 0.2 M glucose solution. What osmotic pressure develops when the cell is placed in \[0.05M\text{ }BaC{{l}_{2}}\] solution at 300 K? |
| A. | 1.23 atm |
| B. | 3.69 atm |
| C. | 6.15 atm |
| D. | None of these |
| Answer» B. 3.69 atm | |
| 1004. |
If \[\alpha \] is the degree of dissociation of \[N{{a}_{2}}S{{O}_{4}}\], the vant Hoff's factor (i) used for calculating the molecular mass is |
| A. | \[1+\alpha \] |
| B. | \[1-\alpha \] |
| C. | \[1+2\alpha \] |
| D. | \[1-2\alpha \] |
| Answer» D. \[1-2\alpha \] | |
| 1005. |
A solution of acetone in ethanol |
| A. | shows a positive deviation from Raoult's law |
| B. | behaves like a non ideal solution |
| C. | obeys Raoult's law |
| D. | shows a negative deviation from Raoult's law |
| Answer» B. behaves like a non ideal solution | |
| 1006. |
The osmotic pressure (at \[27{}^\circ C\]) of an aqueous solution (200mL) containing 6g of a protein is \[2\times {{10}^{-3}}\] atm. If R= 0.080 L atm\[mo{{l}^{-1}}{{K}^{-1}}\], the molecular weight of protein is |
| A. | \[7.2\times {{10}^{5}}\] |
| B. | \[3.6\times {{10}^{5}}\] |
| C. | \[1.8\times {{10}^{5}}\] |
| D. | \[1.0\times {{10}^{5}}\] |
| Answer» C. \[1.8\times {{10}^{5}}\] | |
| 1007. |
Freezing point of an aqueous solution is\[\left( -0.186 \right){}^\circ C\]. Elevation of boiling point of the same solution is\[{{K}_{b}}=0.512{}^\circ C,K{{ }_{f}}=1.86{}^\circ C\], find the increase in boiling point. |
| A. | \[0.186{}^\circ C\] |
| B. | \[0.0512{}^\circ C\] |
| C. | \[0.092{}^\circ C\] |
| D. | \[0.2372{}^\circ C\] |
| Answer» C. \[0.092{}^\circ C\] | |
| 1008. |
1.0 M aqueous solution of \[CrC{{l}_{3}}.6{{H}_{2}}O\] freezes at \[-5.58{}^\circ C\]. Assuming complete ionization of the hydrated complex, which of the following isomers conforms to the observation (\[{{K}_{f}}\] for water \[=1.86K\,kg\,mo{{l}^{-1}}\])? |
| A. | \[[Cr{{\left( {{H}_{2}}O \right)}_{3}}C{{l}_{3}}].3{{H}_{2}}O\] |
| B. | \[[Cr{{\left( {{H}_{2}}O \right)}_{4}}C{{l}_{4}}]Cl.2{{H}_{2}}O\] |
| C. | \[[Cr{{\left( {{H}_{2}}O \right)}_{5}}Cl]C{{l}_{2}}.{{H}_{2}}O\] |
| D. | \[[Cr{{\left( {{H}_{2}}O \right)}_{6}}]C{{l}_{3}}\] |
| Answer» D. \[[Cr{{\left( {{H}_{2}}O \right)}_{6}}]C{{l}_{3}}\] | |
| 1009. |
At \[15{}^\circ C\] and 1 atmosphere partial pressure of hydrogen, 20 mL of hydrogen measured at STP dissolves in 1 L of water. If water at \[15{}^\circ C\] is exposed to a gaseous mixture having a total pressure of 1500 mm of Hg (excluding the vapour pressure of water) and containing 80% hydrogen by volumne, then the volume of hydrogen measured at STP that will dissolve in 1 L of water is |
| A. | 20.0 mL |
| B. | 31.6 mL |
| C. | 36.1 mL |
| D. | 26.3 mL |
| Answer» C. 36.1 mL | |
| 1010. |
If 0.1 M solution of glucose and 0.1 M solution semipermeable membrane to equal heights, then it will be correct to say that |
| A. | there will be no net movement across the membrane |
| B. | glucose will flow towards urea solution |
| C. | urea will flow towards glucose solution |
| D. | water will flow from urea solution to glucose |
| Answer» B. glucose will flow towards urea solution | |
| 1011. |
The temperature at which 10% aqueous solution (w/v) of glucose will exhibit the osmotic pressure of 14 bar is - |
| A. | \[307.3{}^\circ C\] |
| B. | 307.3 K |
| C. | 34 K |
| D. | \[-34{}^\circ C\] |
| Answer» C. 34 K | |
| 1012. |
How many grams of methyl alcohol should be added to 10 litre tank of water to prevent its freezing at 268K? (\[{{K}_{f}}\]for water is \[1.86Kkgmo{{l}^{-1}}\]) |
| A. | 880.07 g |
| B. | 899.04 g |
| C. | 886.02 g |
| D. | 868.06 g |
| Answer» E. | |
| 1013. |
The vapour pressure of pure benzene and toluene at a particular temperature are 100 mm and 50 mm respectively. Then the mole fraction of benzene in vapour phase in contact with equimolar solution of benzene and toluene is |
| A. | 0.67 |
| B. | 0.75 |
| C. | 0.33 |
| D. | 0.5 |
| Answer» B. 0.75 | |
| 1014. |
At a particular temperature, the vapour pressures of two liquids A and B are respectively 120 and 180 mm of mercury If 2 moles of A and 3 moles of B are mixed to form an ideal solution, the vapour pressure of the solution at the same temperature will be (in mm of mercury) |
| A. | 156 |
| B. | 145 |
| C. | 150 |
| D. | 108 |
| Answer» B. 145 | |
| 1015. |
Which of the following is the strongest reducing agent in aqueous medium? |
| A. | Mg |
| B. | Na |
| C. | Li |
| D. | Ca |
| Answer» D. Ca | |
| 1016. |
The brown ring complex is formulated as\[[Fe{{({{H}_{2}}O)}_{5}}NO]S{{O}_{4}}\]. The oxidation number of iron is |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 0 |
| Answer» B. 2 | |
| 1017. |
In the following balanced reaction, \[XMnO_{4}^{-}+Y{{C}_{2}}O_{4}^{2-}+Z{{H}^{+}}\] \[\rightleftharpoons XM{{n}^{2+}}+2YC{{O}_{2}}+\frac{Z}{2}{{H}_{2}}O\] values of X, Y and Z respectively are |
| A. | 2, 5, 16 |
| B. | 8, 2, 5 |
| C. | 5, 2, 16 |
| D. | 5, 8, 4 |
| Answer» B. 8, 2, 5 | |
| 1018. |
In a balance equation \[{{H}_{2}}S{{O}_{4}}+xHI\to {{H}_{2}}S+y{{I}_{2}}+z{{H}_{2}}O,\] the values of x, y, z are |
| A. | x=3, y=5, z=2 |
| B. | x=4, y=8, z=5 |
| C. | x=8, y=4, z=4 |
| D. | x=5, y=3, z=4 |
| Answer» D. x=5, y=3, z=4 | |
| 1019. |
\[a{{K}_{2}}C{{r}_{2}}{{O}_{7}}+bKCl+c{{H}_{2}}S{{O}_{4}}\xrightarrow{{}}\] \[xCr{{O}_{2}}C{{l}_{2}}+yKHS{{O}_{4}}+z{{H}_{2}}O\] The above equation balances when |
| A. | a = 2, b = 4, c = 6 and x = 2, y = 6, z = 3 |
| B. | a = 4, b = 2, c = 6 and x = 6, y = 2, z = 3 |
| C. | a = 6, b = 4, c = 2 and x = 6, y = 3, z = 2 |
| D. | a = 1, b = 4, c = 6 and x = 2, y = 6, z = 3 |
| Answer» E. | |
| 1020. |
The oxidation number of phosphorus in \[Ba{{({{H}_{2}}P{{O}_{2}})}_{2}}\] is |
| A. | 3 |
| B. | 2 |
| C. | 1 |
| D. | -1 |
| Answer» D. -1 | |
| 1021. |
In the balanced chemical reaction \[IO_{3}^{-}+a{{l}^{-}}+b{{H}^{-}}\xrightarrow{{}}c{{H}_{2}}O+d{{I}_{2}}\] a, b, c and d, respectively, correspond to |
| A. | 5, 6, 3, 3 |
| B. | 5, 3, 6, 3 |
| C. | 3, 5, 3, 6 |
| D. | 5, 6, 5, 5 |
| Answer» B. 5, 3, 6, 3 | |
| 1022. |
One gas bleaches the colour of flowers by reduction, while the other by oxidation |
| A. | CO and\[C{{l}_{2}}\] |
| B. | \[S{{O}_{\text{2}}}\] and \[C{{l}_{2}}\] |
| C. | \[{{H}_{2}}S\] and\[B{{r}_{\text{2}}}\] |
| D. | \[N{{H}_{3}}\] and \[S{{O}_{2}}\] |
| Answer» C. \[{{H}_{2}}S\] and\[B{{r}_{\text{2}}}\] | |
| 1023. |
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. |
| Answer» C. If assertion is true but reason is false. | |
| 1024. |
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. |
| Answer» D. If the assertion and reason both are false. | |
| 1025. |
Structure of some important polymers are given. Which one represents Buna-S? |
| A. | \[-(C{{H}_{2}}-\overset{C{{H}_{3}}}{\mathop{\overset{|}{\mathop{C}}\,}}\,=CH-C{{H}_{2}}){{-}_{n}}\] |
| B. | \[-(C{{H}_{2}}-CH=CH-C{{H}_{2}}-\underset{{{C}_{6}}{{H}_{5}}}{\mathop{\underset{|}{\mathop{C}}\,}}\,H-C{{H}_{2}}){{-}_{n}}\] |
| C. | \[-(C{{H}_{2}}-CH=CH-C{{H}_{2}}-\underset{CN}{\mathop{\underset{|}{\mathop{C}}\,}}\,H-C{{H}_{2}}){{-}_{n}}\] |
| D. | \[-(C{{H}_{2}}-\overset{Cl}{\mathop{\overset{|}{\mathop{C}}\,}}\,=CH-C{{H}_{2}}){{-}_{n}}\] |
| Answer» C. \[-(C{{H}_{2}}-CH=CH-C{{H}_{2}}-\underset{CN}{\mathop{\underset{|}{\mathop{C}}\,}}\,H-C{{H}_{2}}){{-}_{n}}\] | |
| 1026. |
The compound which cannot be used as a plasticizer, is |
| A. | di-n-butylphthalate |
| B. | tricresyi phosphate |
| C. | di-ri-octyphthalate |
| D. | diethyl phthalate |
| Answer» E. | |
| 1027. |
Which pair of polymers have similar properties? |
| A. | Nylon, PVC |
| B. | PAN, PTFE |
| C. | PCTFE, PTFE |
| D. | Bakelite, alkyl resin |
| Answer» D. Bakelite, alkyl resin | |
| 1028. |
Melamine plastic crockery is a condensation polymer of |
| A. | HCHO and melamine |
| B. | HCHO and ethylene |
| C. | melamine and ethylene |
| D. | None of these |
| Answer» B. HCHO and ethylene | |
| 1029. |
Biodegradable polymer which can be produced from glycine and aminocaproic acid is: |
| A. | PHBV |
| B. | Buna-N |
| C. | Nylon 6, 6 |
| D. | Nylon 2-nylon 6 |
| Answer» E. | |
| 1030. |
The condensation of hexamethylenediamine with sebacoyl chloride at 525 K gives |
| A. | nylon-6, 20 |
| B. | nylon-6, 01 |
| C. | nylon-6, 10 |
| D. | None of these |
| Answer» D. None of these | |
| 1031. |
The order of stability of the following carbocations:(I) \[C{{H}_{2}}=CH-\overset{+}{\mathop{C}}\,{{H}_{2}}\](II) \[C{{H}_{3}}-C{{H}_{2}}-\overset{+}{\mathop{C}}\,{{H}_{2}}\](III) (IV) \[\overset{+}{\mathop{C}}\,{{H}_{3}}\] is: |
| A. | IV > III > II > I |
| B. | II > III > I > IV |
| C. | III > I> II > IV |
| D. | III > I > IV > II |
| Answer» D. III > I > IV > II | |
| 1032. |
The correct number of chiral centres in |
| A. | 1 |
| B. | 3 |
| C. | 4 |
| D. | 2 |
| Answer» E. | |
| 1033. |
Maleic acid and fumaric acids are |
| A. | Chain isomers |
| B. | Functional isomers |
| C. | Tautomers |
| D. | Geometrical isomers |
| Answer» E. | |
| 1034. |
The number of structural isomers for \[{{C}_{6}}{{H}_{14}}\] is: |
| A. | 4 |
| B. | 3 |
| C. | 6 |
| D. | 5 |
| Answer» E. | |
| 1035. |
Pick up the correct statement regarding the following resonating structures of the anilinium ion |
| A. | Structure II is not acceptable because carbonium ions are less stable than ammonium ions |
| B. | II is not acceptable because it is non- aromatic |
| C. | II is not acceptable because here nitrogen has 10 valence electrons |
| D. | II is an acceptable canonical structure. |
| Answer» D. II is an acceptable canonical structure. | |
| 1036. |
The optically inactive compound from the following is: |
| A. | 2 - chloropropanal |
| B. | 2 - chlorobutane |
| C. | 2 - chloropentane |
| D. | 2 - chloro - 2- methylbutane |
| Answer» E. | |
| 1037. |
Which of the following is the IUPAC name of the compound |
| A. | o - Bromo - m - chlorobenzaldehyde |
| B. | 2 - Bromo - 5 - chlorobenzaldehyde |
| C. | 6 - Bromo - 3 - chlorobenzaldehyde |
| D. | 1 - Bromo - 4 - chlorobenzaldehyde |
| Answer» C. 6 - Bromo - 3 - chlorobenzaldehyde | |
| 1038. |
Arrange the following (w, x, y, z) in decreasing order of their boiling points: |
| A. | \[w>x>z>y\] |
| B. | \[w>x>y>z\] |
| C. | \[w>z>y>x\] |
| D. | \[w>z>x>y\] |
| Answer» E. | |
| 1039. |
Arrange the following in decreasing order of solubility in water |
| A. | \[I>III>II\] |
| B. | \[III>II>I\] |
| C. | \[II>III>I\] |
| D. | All are equally soluble |
| Answer» B. \[III>II>I\] | |
| 1040. |
Calcination is used in metallurgy for removal of? |
| A. | Water and sulphide |
| B. | Water and \[C{{O}_{2}}\] |
| C. | \[C{{O}_{2}}\] and \[{{H}_{2}}S\] |
| D. | \[{{H}_{2}}O\] and \[{{H}_{2}}S\] |
| Answer» C. \[C{{O}_{2}}\] and \[{{H}_{2}}S\] | |
| 1041. |
Heating of ore in the absence of air below its melting point is called |
| A. | leaching |
| B. | roasting |
| C. | smelting |
| D. | calcination |
| Answer» E. | |
| 1042. |
Which of the following statements regarding metallurgy of iron is incorrect? |
| A. | Reaction \[F{{e}_{3}}{{O}_{4}}+4CO\xrightarrow{{}}3Fe+4C{{O}_{2}}\] belongs to lower temperature range (500 - 800K) of the blast furnace. |
| B. | Reaction \[FeO+CO\xrightarrow{{}}Fe+C{{O}_{2}}\] belongs to higher temperature range (900 -1500K) of the blast furnace. |
| C. | The iron obtained from blast furnace is cast iron with 3% carbon. |
| D. | For reduction of iron oxide to occur \[\Delta G\] of the couple of following reactions should be negative \[FeO(s)\xrightarrow{{}}Fe(s)+\frac{1}{2}{{O}_{2}}(g)\] \[C(s)+\frac{1}{2}{{O}_{2}}(g)\xrightarrow{{}}CO(g)\] |
| Answer» D. For reduction of iron oxide to occur \[\Delta G\] of the couple of following reactions should be negative \[FeO(s)\xrightarrow{{}}Fe(s)+\frac{1}{2}{{O}_{2}}(g)\] \[C(s)+\frac{1}{2}{{O}_{2}}(g)\xrightarrow{{}}CO(g)\] | |
| 1043. |
Which of the following processes involve the roasting process? |
| A. | \[ZnC{{O}_{3}}\to ZnO+C{{O}_{2}}\] |
| B. | \[F{{e}_{2}}{{O}_{3}}+3C\to 2Fe+3CO\] |
| C. | \[2PbS+3{{O}_{2}}\to 2PbO+2S{{O}_{2}}\] |
| D. | \[A{{l}_{2}}{{O}_{3}}.2{{H}_{2}}O\to A{{l}_{2}}{{O}_{3}}+2{{H}_{2}}O\] |
| Answer» D. \[A{{l}_{2}}{{O}_{3}}.2{{H}_{2}}O\to A{{l}_{2}}{{O}_{3}}+2{{H}_{2}}O\] | |
| 1044. |
When a metal is to be extracted from its ore and the gangue associated with the ore is silica, then |
| A. | an acidic flux is needed |
| B. | a basic flux is needed |
| C. | both acidic and basic fluxes are needed |
| D. | Neither of them is needed |
| Answer» C. both acidic and basic fluxes are needed | |
| 1045. |
In the extraction of aluminium by Hall-Heroult process, purified \[A{{l}_{2}}{{O}_{3}}\] is mixed with \[Ca{{F}_{2}}\] to(i) lower the melting point of \[A{{l}_{2}}{{O}_{3}}\].(ii) increase the conductivity of molten mixture.(iii) reduce \[A{{l}^{3+}}\] into \[Al\left( s \right).\](iv) acts as catalyst. |
| A. | (i) and (ii) |
| B. | (i), (ii) and (iii) |
| C. | (iii) and (iv) |
| D. | (ii), (iii) and (iv) |
| Answer» B. (i), (ii) and (iii) | |
| 1046. |
Pyrolusite is a/an |
| A. | oxide ore |
| B. | sulphide ore |
| C. | carbide ore |
| D. | Not an ore |
| Answer» B. sulphide ore | |
| 1047. |
Consider the following metallurgical processes:(I) Heating impure metal CO and distilling the resulting volatile carbonyl \[\left( b.p.\text{ }43{}^\circ C \right)\] and finally decomposition at \[150{}^\circ -200{}^\circ C\] to get the pure metal(II) Heating the sulphide ore in air until a part is converted to oxide and then furher heating in the absence of air to let the oxide react with unchanged metal sulphide(III) Electrolysis of the molten electrolyte containing approximately equal amounts of the metal chloride and \[NaCl\] to obtained the metalThe processes used for obtaning magnesium, nickel and copper are respectively: |
| A. | (I), (II) and (III) |
| B. | (II), (III) and (I) |
| C. | (III), (I) and (II) |
| D. | (II), (I) and (III) |
| Answer» D. (II), (I) and (III) | |
| 1048. |
Which of the following statements, about the advantage of roasting of sulphide ore before reduction is not true? |
| A. | The \[\Delta G_{f}^{{}^\circ }\] of the sulphide is greater than those for \[C{{S}_{2}}\] and \[{{H}_{2}}s\]. |
| B. | The \[\Delta G_{f}^{{}^\circ }\] is negative for roasting of sulphide ore to oxide. |
| C. | Roasting of the sulphide to the oxide is thermodynamically feasible. |
| D. | Carbon and hydrogen are suitable reducing agents for reduction of metal sulphides. |
| Answer» E. | |
| 1049. |
Which one of the following is a mineral of iron? |
| A. | Malachite |
| B. | Cassiterite |
| C. | Pyrolusite |
| D. | Magnetite |
| Answer» E. | |
| 1050. |
If an impurity in a metal has a greater affinity for oxygen and is more easily oxidised than the metal, then the purification of metal may be carried out by |
| A. | Poling |
| B. | Zone refining |
| C. | Electrolytic refining |
| D. | Cupellation |
| Answer» E. | |