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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.
| 10451. |
What is the atomic weight of an element X for which a sample containing \[1.58\times {{10}^{22}}\] atoms weigh 1.05 g? |
| A. | 28 g |
| B. | 20 g |
| C. | 40 g |
| D. | 23 g |
| Answer» D. 23 g | |
| 10452. |
What weight of \[{{H}_{2}}{{C}_{2}}{{O}_{4}}\,\,2{{H}_{2}}O\,\,(\text{mol}\text{.}\,\text{wt}\text{.}\,=126)\] should be dissolved to prepare 250 ml of cent normal to be used as a reducing agent? |
| A. | 0.63 gm |
| B. | 0.1575 gm |
| C. | 0.126 gm |
| D. | 0.875 gm |
| Answer» D. 0.875 gm | |
| 10453. |
Two elements X and Y have atomic weights of 14 and 16. They form a series of compounds A, B, C, D and E in which the same amount of element X, Y is present in the ratio 1 : 2 : 3 : 4 : 5. If the compound A has 28 parts by weight of X and 16 parts by weight of Y, then the compound of C will have 28 parts weight of X and |
| A. | 32 parts by weight of Y |
| B. | 48 parts by weight of Y |
| C. | 64 parts by weight of Y |
| D. | 80 parts by weight of Y |
| Answer» C. 64 parts by weight of Y | |
| 10454. |
2.76 g of silver carbonate on being strongly heated yields a residue weighing |
| A. | 2.15 g |
| B. | 2.48 g |
| C. | 2.32 g |
| D. | 2.64 g |
| Answer» B. 2.48 g | |
| 10455. |
How many moles of electron weigh one kilogram? |
| A. | \[6.023\times {{10}^{23}}\] |
| B. | \[\frac{1}{9.108}\times {{10}^{31}}\] |
| C. | \[\frac{6.023}{9.108}\times {{10}^{54}}\] |
| D. | \[\frac{1}{9.108\times 6.023}\times 108\] |
| Answer» E. | |
| 10456. |
23.2 g of an organic compound having molecular formula \[{{C}_{n}}{{H}_{2n+2}}\] is burnt in excess of \[{{O}_{2}}(g)\]initially taken in a 44.82 L steel vessel. Before reaction the gaseous mixture w at 273 K with pressure of 2 aim. After complete combustion and loss of considerable amount of heat the mixture of product and excess of had a temperature of 546 K and 4.6 atm pressure. The formula of compound is |
| A. | \[{{C}_{5}}{{H}_{12}}\] |
| B. | \[{{C}_{6}}{{H}_{10}}\] |
| C. | \[{{C}_{3}}{{H}_{8}}\] |
| D. | \[{{C}_{4}}{{H}_{10}}\] |
| Answer» E. | |
| 10457. |
A 0.70 g sample consisting \[Ca{{C}_{2}}{{O}_{4}}\] and \[Mg{{C}_{2}}{{O}_{4}}\] is heated at \[300{}^\circ C,\] converting the two salts of \[CaC{{O}_{3}}\] and \[MgC{{O}_{3}}\]. The sample when weighs 0.47 g. If the sample had been heated to \[700{}^\circ C\] where the products are CaO and MgO. What would be the weight of mixture of oxides? |
| A. | 0.36 g |
| B. | 0.14 g |
| C. | 0.28 g |
| D. | 1.08 g |
| Answer» D. 1.08 g | |
| 10458. |
Molarity of liquid \[HCl\] with density equal to \[1.17g/cc\] is [CBSE PMT 2001] |
| A. | 36.5 |
| B. | 18.25 |
| C. | 32.05 |
| D. | 4.65 |
| Answer» D. 4.65 | |
| 10459. |
The number of electrons in a mole of hydrogen molecule is [CPMT 1987] |
| A. | \[6.02\times {{10}^{23}}\] |
| B. | \[12.046\times {{10}^{23}}\] |
| C. | \[3.0115\times {{10}^{23}}\] |
| D. | Indefinite |
| Answer» B. \[12.046\times {{10}^{23}}\] | |
| 10460. |
The total number of protons in 10 g of calcium carbonate is (\[{{N}_{0}}=6.023\times {{10}^{23}}\]) |
| A. | \[1.5057\times {{10}^{24}}\] |
| B. | \[2.0478\times {{10}^{24}}\] |
| C. | \[3.0115\times {{10}^{24}}\] |
| D. | \[4.0956\times {{10}^{24}}\] |
| Answer» D. \[4.0956\times {{10}^{24}}\] | |
| 10461. |
One atmosphere is equal to |
| A. | 101.325 K pa |
| B. | 1013.25 K pa |
| C. | \[{{10}^{5}}\]Nm |
| D. | None of these |
| Answer» B. 1013.25 K pa | |
| 10462. |
The unit J \[P{{a}^{-1}}\]is equivalent to |
| A. | \[{{m}^{3}}\] |
| B. | \[c{{m}^{3}}\] |
| C. | \[d{{m}^{3}}\] |
| D. | None of these |
| Answer» B. \[c{{m}^{3}}\] | |
| 10463. |
Which one of the following is not an element |
| A. | Diamond |
| B. | Graphite |
| C. | Silica |
| D. | Ozone |
| Answer» D. Ozone | |
| 10464. |
A sample was weighted using two different balances. The result?s were (i) 3.929 g (ii) 4.0 g. How would the weight of the sample be reported |
| A. | 3.929 g |
| B. | 3 g |
| C. | 3.9 g |
| D. | 3.93 g |
| Answer» E. | |
| 10465. |
A sample of \[Al{{F}_{3}}\] contains \[3.0\times {{10}^{24}}{{F}^{-}}\] ions. The number of formula unit of this sample are- |
| A. | \[9\times {{10}^{24}}\] |
| B. | \[3\times {{10}^{24}}\] |
| C. | \[0.75\times {{10}^{24}}\] |
| D. | \[1.0\times {{10}^{24}}\] |
| Answer» E. | |
| 10466. |
If potassium chlorate is 80% pure, then 48 g of oxygen would be produced from (atomic mass of K=39) |
| A. | 153.12 g of \[KCl{{O}_{3}}\] |
| B. | 122.5 g of \[KCl{{O}_{3}}\] |
| C. | 245 g of\[KCl{{O}_{3}}\] |
| D. | 98 g of \[KCl{{O}_{3}}\] |
| Answer» B. 122.5 g of \[KCl{{O}_{3}}\] | |
| 10467. |
Sulfuryl chloride \[(S{{O}_{2}}C{{l}_{2}})\] reacts with water to give a mixture of \[{{H}_{2}}S{{O}_{4}}\] and HCl. How many moles of baryta would be required to neutralize the solution formed by adding 4 mole of \[S{{O}_{2}}C{{l}_{2}}\] to excess of water? |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» C. 3 | |
| 10468. |
Which statement is false for the balanced equation given below? \[C{{S}_{2}}+3{{O}_{2}}\xrightarrow{{}}2S{{O}_{2}}+C{{O}_{2}}\] |
| A. | One mole of \[C{{S}_{2}}\]will produce one mole of \[C{{O}_{2}}\] |
| B. | The reaction of 16 g of oxygen produces 7.33g of \[C{{O}_{2}}\] |
| C. | The reaction of one mole of\[{{O}_{2}}\] will produce 2/3 mole of \[C{{S}_{2}}\] |
| D. | Six molecules of oxygen requires three molecules of \[C{{S}_{2}}\] |
| Answer» E. | |
| 10469. |
How many moles of \[{{P}_{4}}\] can be produced by reaction of 0.10 moles \[C{{a}_{5}}{{(P{{O}_{4}})}_{3}}\text{F},0.36\] moles \[Si{{O}_{2}}\] and 0.90 moles C according to the following reaction?\[4C{{a}_{5}}{{\left( P{{O}_{4}} \right)}_{3}}F+18Si{{O}_{2}}+30C\xrightarrow{{}}\]\[3{{P}_{4}}+2Ca{{F}_{2}}+18CaSi{{O}_{3}}+30CO\] |
| A. | 0.06 |
| B. | 0.03 |
| C. | 0.045 |
| D. | 0.075 |
| Answer» B. 0.03 | |
| 10470. |
On subjecting 10 mL mixture of \[{{N}_{2}}\] and CO to repeated electro spark, 7 mL of \[{{O}_{2}}\] was required for combustion. What was the mole percent of CO in the mixture? (All volumes were measured under identical conditions) |
| A. | 60 |
| B. | 40 |
| C. | 6 |
| D. | 4 |
| Answer» B. 40 | |
| 10471. |
How many of \[0.1N\text{ }HCl\]are required to react completely with 1 g mixture of \[N{{a}_{2}}C{{O}_{3}}\] and \[NaHC{{O}_{3}}\]. containing equimolar amounts of two ? |
| A. | 157.7mL |
| B. | 15.77 mL |
| C. | 147.7 mL |
| D. | 14.77 mL |
| Answer» B. 15.77 mL | |
| 10472. |
The ppm level of \[{{F}^{-}}\] in a 500 g sample of a tooth paste containing \[0.2g\text{ }{{F}^{-}}\] is |
| A. | 400 |
| B. | 1000 |
| C. | 250 |
| D. | 200 |
| Answer» B. 1000 | |
| 10473. |
9 moles of "D" and 14 moles of E are allowed to react in a closed vessel according to given reactions. Calculate number of moles of B formed in the end of reaction, if 4 moles of G are present in reaction vessel. (Percentage yield of reaction is mentioned in the reaction)Step-1 \[3D+4E\xrightarrow{80%}~5C+A\]Step-2 \[3C+5G\,\xrightarrow{50%}6B+F\] |
| A. | 2.4 |
| B. | 30 |
| C. | 4.8 |
| D. | 1 |
| Answer» B. 30 | |
| 10474. |
The density of 3M solution of sodium chloride is \[1.252g\text{ }m{{L}^{-1}}\]. The molality of the solution will be (molar mass,\[NaCl=585gmo{{l}^{-1}}\]) |
| A. | 2.60 m |
| B. | 2.18 m |
| C. | 2.79 m |
| D. | 3.00 m |
| Answer» D. 3.00 m | |
| 10475. |
If the true value for an experimental result is 6.23 and the results reported by three students X, Y and Z are: X: 6.18 and 6.28 Y: 6.20 and 6.023 Z: 6.22 and 6.24 Which of the following option is correct? |
| A. | X precise, Y accurate, Z precise and accurate. |
| B. | X precise and accurate, Y not precise, Z precise |
| C. | Both X & Z precise & accurate, Y not precise. |
| D. | Both X & Y neither precise nor accurate, Z both precise and accurate. |
| Answer» E. | |
| 10476. |
In which of the following pairs of compounds the ratio of C, H and O is same |
| A. | Acetic acid and methyl alcohol |
| B. | Glucose and acetic acid |
| C. | Fructose and sucrose |
| D. | All of these |
| Answer» C. Fructose and sucrose | |
| 10477. |
The percentage of nitrogen in urea is about [KCET 2001] |
| A. | 46 |
| B. | 85 |
| C. | 18 |
| D. | 28 |
| Answer» B. 85 | |
| 10478. |
The mass of 70% \[{{H}_{2}}S{{O}_{4}}\] required for neutralisation of 1 mol of NaOH. |
| A. | 49 g |
| B. | 98 g |
| C. | 70 g |
| D. | 34.3 g |
| Answer» D. 34.3 g | |
| 10479. |
Valency factors for \[C{{u}_{2}}S\] and \[C{{u}_{{}}}S\] is x and y respectively when they react with KMn\[{{O}_{4}}\] in acidic medium. What is the value of x- y? |
| A. | 4 |
| B. | 2 |
| C. | 5 |
| D. | 6 |
| Answer» C. 5 | |
| 10480. |
5.6 g of a metal forms 12.7 g of metal chloride. Hence equivalent weight of the metal is |
| A. | 127 |
| B. | 254 |
| C. | 56 |
| D. | 28 |
| Answer» E. | |
| 10481. |
The partial pressure of \[C{{O}_{2}}\] in air saturated with water vapours at \[25{}^\circ C\] and 1.00 atm is \[3.04\times {{10}^{-4}}\] atm. Henry's constant for \[C{{O}_{2}}\] in water is \[2.3\times {{10}^{-2}}\,\text{mol}\,{{\text{L}}^{-1}}\text{at}{{\text{m}}^{-1}}\] and for carbonic acid \[p{{K}_{a}}\] is 6.37. The pH of normal (\[C{{O}_{2}}\] mixed) rain water will be |
| A. | 7.42 |
| B. | 6.37 |
| C. | 6.99 |
| D. | 5.76 |
| Answer» E. | |
| 10482. |
Normal boiling point of water is 373 K (at 760 mm). Vapor pressure of water at 298 K is 23 mm. If the enthalpy of evaporation is 40.656 kJ/mol, the boiling point of water at 23 mm pressure will be: |
| A. | 250 K |
| B. | 294 K |
| C. | 51.6 K |
| D. | 12.5 K |
| Answer» C. 51.6 K | |
| 10483. |
The expression relating degree of dissociation of the weak electrolyte \[{{A}_{x}}{{B}_{y}}\] with its van't Hoff factor is |
| A. | \[\alpha =\frac{i-1}{x+y-1}\] |
| B. | \[\alpha =\frac{i+1}{x+y-1}\] |
| C. | \[\alpha =\frac{x+y-1}{i-1}\] |
| D. | \[\alpha =\frac{x+y-1}{i+1}\] |
| Answer» B. \[\alpha =\frac{i+1}{x+y-1}\] | |
| 10484. |
A mixture of A and B, which are two miscible liquids, is distilled under equilibrium conditions at atmospheric pressure. The mole fraction of A in solution is 0.3 and in vapour phase is 0.6. If the solution behaves ideally the ratio of \[P\,_{A}^{o}\] to \[P\,_{B}^{o}\] is |
| A. | 4 |
| B. | 2.5 |
| C. | 3.5 |
| D. | 1.5 |
| Answer» D. 1.5 | |
| 10485. |
If an equimolar solutions of \[CaC{{l}_{2}}\] and \[AlC{{l}_{3}}\] in water have boiling point of \[{{t}_{1}}\] and \[{{t}_{2}}\] respectively then |
| A. | \[{{t}_{1}}>{{t}_{2}}\] |
| B. | \[{{t}_{2}}+{{t}_{1}}\le 0\] |
| C. | \[{{t}_{1}}={{t}_{2}}\] |
| D. | \[{{t}_{1}}<{{t}_{2}}\] |
| Answer» E. | |
| 10486. |
The vapour pressure lowering of 0.2 molal urea solution at 40°C is (assuming latent heat of vaporization \[(\Delta H)\] is 10 Kcal/mol.) |
| A. | 0.2 torr |
| B. | 0.1 torr |
| C. | 0.5 torr |
| D. | 0.3 torr |
| Answer» B. 0.1 torr | |
| 10487. |
Formation of a solution from two components can be considered as (i) Pure solvent \[\to \] separated solvent molecules, \[\Delta {{H}_{1}}\] (ii) Pure solute \[\to \] separated solute molecules, \[\Delta {{H}_{2}}\] (iii) Separated solvent & solute molecules \[\to \] Solution, \[\Delta {{H}_{3}}\] solution so formed will be ideal if |
| A. | \[\Delta {{H}_{so\ln }}=\Delta {{H}_{3}}-\Delta {{H}_{1}}-\Delta {{H}_{2}}\] |
| B. | \[\Delta {{H}_{so\ln }}=\Delta {{H}_{1}}+\Delta {{H}_{2}}+\Delta {{H}_{3}}\] |
| C. | \[\Delta {{H}_{so\ln }}=\Delta {{H}_{1}}+\Delta {{H}_{2}}-\Delta {{H}_{3}}\] |
| D. | \[\Delta {{H}_{so\ln }}=\Delta {{H}_{1}}-\Delta {{H}_{2}}-\Delta {{H}_{3}}\] |
| Answer» C. \[\Delta {{H}_{so\ln }}=\Delta {{H}_{1}}+\Delta {{H}_{2}}-\Delta {{H}_{3}}\] | |
| 10488. |
The total vapor pressure of a mixture of 1 mol of volatile component A (\[P_{A}^{O}\]= 100 mm Hg) and 3 mol of volatile component B (\[P_{B}^{O}\]=80 mm Hg) is 90 mm Hg. For such case: |
| A. | there is a positive deviation from Raoult's law |
| B. | boiling point has been lowered |
| C. | force of attraction between A and B is smaller than that between A and A or between B and B |
| D. | all the above statements are correct |
| Answer» E. | |
| 10489. |
An aqueous solution containing liquid A \[(M.\,\,Wt.=128)\] 64% by weight has a vapour pressure of 145 mm. Find the vapour pressure of pure A. If that of water is 155 mm at the same temperature. |
| A. | 205 mm |
| B. | 2.05 mm |
| C. | 1.05 mm |
| D. | 105 mm |
| Answer» E. | |
| 10490. |
Match List I with List II and select the correct answer using the code given below the lists: List (I) List (II) [A] 50 mL of 3M HCl solution +150 mL of 1 M \[FeC{{l}_{3}}\] solution (p) 4.17 m [B] An aqueous solution of NaCl with mole fraction of NaCl as 0.1 (q) \[[C{{l}^{-}}]=3M\] [C] 20% (w/w) propanol \[({{C}_{3}}{{H}_{7}}OH)\] solution (r) \[[{{H}^{+}}]=2.75M\] [D] 10.95% (w/v) HCl solution (s) 6.1 m |
| A. | A-r, B-s, C-p, D-q |
| B. | A-q, B-s, C-r, D-q |
| C. | A-q, B-s, C-p, D-q |
| D. | A-q, B-r, C-p, D-s |
| Answer» D. A-q, B-r, C-p, D-s | |
| 10491. |
Suppose 5 gm of \[C{{H}_{3}}COOH\] is dissolved in one litre of ethanol. Assume that no reaction between them takes place. Calculate molality of resulting solution if density of ethanol is 0.789 gm/ml. |
| A. | 0.0856 |
| B. | 0.0956 |
| C. | 0.1056 |
| D. | 0.1156 |
| Answer» D. 0.1156 | |
| 10492. |
The ratio of \[\Delta {{T}_{f}}\] for \[{{K}_{4}}[Fe{{(CN)}_{6}}]\] solution (assuming complete ionization) to \[\Delta {{T}_{f}}\] for solution of sugar of equal concentration is |
| A. | 0.167361111111111 |
| B. | 0.209722222222222 |
| C. | 0.209027777777778 |
| D. | 0.177083333333333 |
| Answer» D. 0.177083333333333 | |
| 10493. |
Maximum freezing point will be for 1 molal solution of assuming equal ionization in each case |
| A. | \[[Fe{{({{H}_{2}}O)}_{6}}]C{{l}_{3}}\] |
| B. | \[[Fe{{({{H}_{2}}O)}_{5}}Cl]C{{l}_{2}}.{{H}_{2}}O\] |
| C. | \[[Fe{{({{H}_{2}}O)}_{4}}C{{l}_{2}}]Cl.\,2{{H}_{2}}O\] |
| D. | \[[Fe{{({{H}_{2}}O)}_{3}}C{{l}_{3}}].\,3{{H}_{2}}O\] |
| Answer» E. | |
| 10494. |
A 0.001 molal solution of \[\left[ Pt{{\left( N{{H}_{3}} \right)}_{4}}C{{l}_{4}} \right]\] in water had a freezing point depression of\[0.0054{}^\circ C\]. If \[{{K}_{f}}\] for water is 1.80, the correct formulation for the above molecule is: |
| A. | \[\left[ Pt{{\left( N{{H}_{3}} \right)}_{4}}C{{l}_{3}} \right]Cl\] |
| B. | \[\left[ Pt{{\left( N{{H}_{3}} \right)}_{4}}Cl \right]C{{l}_{2}}\] |
| C. | \[\left[ Pt{{\left( N{{H}_{3}} \right)}_{4}}C{{l}_{2}} \right]C{{l}_{3}}\] |
| D. | \[\left[ Pt{{\left( N{{H}_{3}} \right)}_{4}}C{{l}_{4}} \right]\] |
| Answer» C. \[\left[ Pt{{\left( N{{H}_{3}} \right)}_{4}}C{{l}_{2}} \right]C{{l}_{3}}\] | |
| 10495. |
Vapour pressure of \[CC{{l}_{4}}\] at \[{{25}^{o}}C\] is 143 mm of Hg. 0.5 gm of a non-volatile solute (mol. wt. = 65) is dissolved in 100 ml \[CC{{l}_{4}}.\] Find the vapour pressure of the solution (Density of \[CC{{l}_{4}}=1.54\,g.c{{m}^{3}}\]) |
| A. | 141.93 mm |
| B. | 94.39 mm |
| C. | 199.34 mm |
| D. | 143.99 mm |
| Answer» B. 94.39 mm | |
| 10496. |
Equal volume of 0.1 M urea and 0.1 M glucose are mixed. The mixture will have |
| A. | Lower osmotic pressure |
| B. | Same osmotic pressure |
| C. | Higher osmotic pressure |
| D. | None of these |
| Answer» C. Higher osmotic pressure | |
| 10497. |
An azeotropic mixture of two liquids boils at a lower temperature than either of them when |
| A. | it is saturated |
| B. | it does not deviate from Raoult's law |
| C. | it shows negative deviation from Raoult's law |
| D. | it shows positive deviation from Raoult's law |
| Answer» E. | |
| 10498. |
At \[20{}^\circ C\] and 1.00 atm partial pressure of hydrogen, 18 mL of hydrogen, measured at STP, dissolves in 1L of water. If water at \[20{}^\circ C\]is exposed to a gaseous mixture having a total pressure of 1400 Torr (excluding the vapour pressure of water) and containing 68.5% \[{{H}_{2}}\] by volume, find the volume of \[{{H}_{2}},\] measured at STP, which will dissolve in 1L of water. |
| A. | 18 mL |
| B. | 12 mL |
| C. | 23 mL |
| D. | 121 mL |
| Answer» D. 121 mL | |
| 10499. |
A solution of 0.2 mole \[Kl\]\[(\alpha =100\,%)\] in 1000 g water freezes at \[{{T}_{1}}{{\,}^{0}}C\]. Now to this solution 0.1 mole \[Hg{{I}_{2}}\] is added and the resulting solution freezes at \[{{T}_{2}}{{\,}^{0}}C\]. Which of the following is correct: |
| A. | \[{{T}_{1}}={{T}_{2}}\] |
| B. | \[{{T}_{1}}>{{T}_{2}}\] |
| C. | \[{{T}_{1}}<{{T}_{2}}\] |
| D. | Nothing can be predict |
| Answer» D. Nothing can be predict | |
| 10500. |
Find the molality of \[{{H}_{2}}S{{O}_{4}}\] solution whose specific gravity is \[1.98\,g\,m{{l}^{-}}\] and 95% of volume is \[{{H}_{2}}S{{O}_{4}}\]. |
| A. | 7.412 |
| B. | 8.412 |
| C. | 9.412 |
| D. | 10.412 |
| Answer» D. 10.412 | |