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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.
| 6651. |
Calculate the molal depression constant of a solvent which has freezing point \[{{16.6}^{o}}C\] and latent heat of fusion \[180.75\,J{{g}^{-1}}\]. [Orissa JEE 2005] |
| A. | 2.68 |
| B. | 3.86 |
| C. | 4.68 |
| D. | 2.86t6 |
| Answer» C. 4.68 | |
| 6652. |
What should be the freezing point of aqueous solution containing \[17\,gm\] of \[{{C}_{2}}{{H}_{5}}OH\] in \[1000\,gm\] of water (water \[{{K}_{f}}\] = 1.86 \[\deg -kg\,mo{{l}^{-1}}\] [MP PMT 1986] |
| A. | \[-{{0.69}^{o}}C\] |
| B. | \[-{{0.34}^{o}}C\] |
| C. | \[{{0.0}^{o}}C\] |
| D. | \[{{0.34}^{o}}C\] |
| Answer» B. \[-{{0.34}^{o}}C\] | |
| 6653. |
The freezing point of a 0.01M aqueous glucose solution at 1 atmosphere is \[-{{0.18}^{o}}C\]. To it, an addition of equal volume of 0.002 M glucose solution will; produce a solution with freezing point of nearly [AMU 1999] |
| A. | \[-{{0.036}^{o}}C\] |
| B. | \[-{{0.108}^{o}}C\] |
| C. | \[-{{0.216}^{o}}C\] |
| D. | \[-{{0.422}^{o}}C\] |
| Answer» D. \[-{{0.422}^{o}}C\] | |
| 6654. |
Which will show maximum depression in freezing point when concentration is 0.1M [IIT 1989; MNR 1990; UPSEAT 2000; 03; BCECE 2005] |
| A. | NaCl |
| B. | Urea |
| C. | Glucose |
| D. | \[{{K}_{2}}S{{O}_{4}}\] |
| Answer» E. | |
| 6655. |
Which of the following aqueous molal solution have highest freezing point [UPSEAT 2000, 01, 02; MNR 1988] |
| A. | Urea |
| B. | Barium chloride |
| C. | Potassium bromide |
| D. | Aluminum sulphate |
| Answer» B. Barium chloride | |
| 6656. |
1.00 gm of a non-electrolyte solute dissolved in 50 gm of benzene lowered the freezing point of benzene by 0.40 K. \[{{K}_{f}}\] for benzene is 5.12 kg mol?1. Molecular mass of the solute will be [DPMT 2004] |
| A. | \[256\,g\,mo{{l}^{-1}}\] |
| B. | \[2.56\,g\,mo{{l}^{-1}}\] |
| C. | \[512\times {{10}^{3}}\,g\,mo{{l}^{-1}}\] |
| D. | \[2.56\times {{10}^{4}}\,g\,mo{{l}^{-1}}\] |
| Answer» B. \[2.56\,g\,mo{{l}^{-1}}\] | |
| 6657. |
The amount of urea to be dissolved in 500 ml of water (K =18.6 K \[mol{{e}^{-1}}\]in 100g solvent) to produce a depression of \[{{0.186}^{o}}C\] in freezing point is [MH CET 2000] |
| A. | 9 g |
| B. | 6 g |
| C. | 3 g |
| D. | 0.3 g |
| Answer» D. 0.3 g | |
| 6658. |
During depression of freezing point in a solution the following are in equilibrium [IIT Screening 2003] |
| A. | Liquid solvent, solid solvent |
| B. | Liquid solvent, solid solute |
| C. | Liquid solute, solid solute |
| D. | Liquid solute solid solvent |
| Answer» B. Liquid solvent, solid solute | |
| 6659. |
What is the effect of the addition of sugar on the boiling and freezing points of water [Kerala CET (Med.) 2003] |
| A. | Both boiling point and freezing point increases |
| B. | Both boiling point and freezing point decreases |
| C. | Boiling point increases and freezing point decreases |
| D. | Boiling point decreases and freezing point increases |
| Answer» D. Boiling point decreases and freezing point increases | |
| 6660. |
Given that \[\Delta {{T}_{f}}\] is the depression in freezing point of the solvent in a solution of a non-volatile solute of molality \[m\], the quantity \[\underset{m\to 0}{\mathop{\lim }}\,\left( \frac{\Delta {{T}_{f}}}{m} \right)\] is equal to [IIT 1994; UPSEAT 2001] |
| A. | Zero |
| B. | One |
| C. | Three |
| D. | None of the above |
| Answer» E. | |
| 6661. |
Heavy water freezes at [CPMT 1993] |
| A. | \[{{0}^{o}}C\] |
| B. | \[{{3.8}^{o}}C\] |
| C. | \[{{38}^{o}}C\] |
| D. | \[-{{0.38}^{o}}C\] |
| Answer» C. \[{{38}^{o}}C\] | |
| 6662. |
After adding a solute freezing point of solution decreases to ? 0.186. Calculate \[\Delta {{T}_{b}}\] if \[{{K}_{f}}=1.86\] and \[{{K}_{b}}=0.521\]. [Orissa JEE 2002, 04; MP PET/PMT 1998; AIEEE 2000] |
| A. | 0.521 |
| B. | 0.0521 |
| C. | 1.86 |
| D. | 0.0186 |
| Answer» C. 1.86 | |
| 6663. |
An aqueous solution of a non-electrolyte boils at \[{{100.52}^{o}}C\]. The freezing point of the solution will be |
| A. | \[{{0}^{o}}C\] |
| B. | \[-{{1.86}^{o}}C\] |
| C. | \[{{1.86}^{o}}C\] |
| D. | None of the above |
| Answer» C. \[{{1.86}^{o}}C\] | |
| 6664. |
The molar freezing point constant for water is \[{{1.86}^{o}}C\,mol{{e}^{-1}}\]. If 342 gm of canesugar \[({{C}_{12}}{{H}_{22}}{{O}_{11}})\] are dissolved in 1000 \[gm\] of water, the solution will freeze at [NCERT 1977; CPMT 1989; Roorkee 2000; DCE 2004] |
| A. | \[-{{1.86}^{o}}C\] |
| B. | \[{{1.86}^{o}}C\] |
| C. | \[-{{3.92}^{o}}C\] |
| D. | \[{{2.42}^{o}}C\] |
| Answer» B. \[{{1.86}^{o}}C\] | |
| 6665. |
A solution of urea \[\left( mol.\text{ }mass\text{ }56g\text{ }mo{{l}^{-1}} \right)\] boils at 100.18°C at the atmospheric pressure. If \[{{K}_{f}}\] and \[{{K}_{b}}\]for water are 1.86 and \[0.512K\text{ }kg\text{ }mo{{l}^{-1}}\] respectively the above solution will freeze at [CBSE PMT 2005] |
| A. | \[\,- 6.54{}^\circ C\] |
| B. | \[6.54{}^\circ C\] |
| C. | \[0.654{}^\circ C\] |
| D. | \[-0.654{}^\circ C\] |
| Answer» E. | |
| 6666. |
Schottky defect generally appears in [DCE 2004] |
| A. | \[NaCl\] |
| B. | \[KCl\] |
| C. | \[CsCl\] |
| D. | All of these |
| Answer» E. | |
| 6667. |
Frenkel defect is caused due to [MP PET 1994] |
| A. | An ion missing from the normal lattice site creating a vacancy |
| B. | An extra positive ion occupying an interstitial position in the lattice |
| C. | An extra negative ion occupying an interstitial position in the lattice |
| D. | The shift of a positive ion from its normal lattice site to an interstitial site |
| Answer» E. | |
| 6668. |
In the laboratory, sodium chloride is made by burning the sodium in the atmosphere of chlorine which is yellow in colour. The cause of yellow colour is |
| A. | Presence of \[N{{a}^{+}}\]ions in the crystal lattice |
| B. | Presence of \[C{{l}^{-}}\]ions in the crystal lattice |
| C. | Presence of electron in the crystal lattice |
| D. | Presence of face centered cubic crystal lattice |
| Answer» D. Presence of face centered cubic crystal lattice | |
| 6669. |
If \[NaCl\] is doped with \[{{10}^{-3}}mol\ %\,\,SrC{{l}_{2}},\] then the concentration of cation vacancies will be |
| A. | \[1\times {{10}^{-3}}mol%\] |
| B. | \[2\times {{10}^{-3}}mol%\] |
| C. | \[3\times {{10}^{-3}}mol%\] |
| D. | \[4\times {{10}^{-3}}mol%\] |
| Answer» B. \[2\times {{10}^{-3}}mol%\] | |
| 6670. |
Doping of silicon (Si) with boron B leads to [UPSEAT 2004] |
| A. | \[n\]-type semiconductor |
| B. | \[p\]-type semiconductor |
| C. | Metal |
| D. | Insulator |
| Answer» E. | |
| 6671. |
Schottky defect defines imperfection in the lattice structure of a [AIIMS 2002] |
| A. | Solid |
| B. | Liquid |
| C. | Gas |
| D. | Plasma |
| Answer» B. Liquid | |
| 6672. |
In a solid lattice the cation has left a lattice site and is located at an interstitial position, the lattice defect is [AIIMS 1982, 1991; DCE 2002; J & K 2005] |
| A. | Interstitial defect |
| B. | Valency defect |
| C. | Frenkel defect |
| D. | Schottky defect |
| Answer» D. Schottky defect | |
| 6673. |
Which one of the following crystals does not exhibit Frenkel defect [MP PET 2002] |
| A. | AgBr |
| B. | AgCl |
| C. | KBr |
| D. | ZnS |
| Answer» D. ZnS | |
| 6674. |
Which defect causes decrease in the density of crystal [KCET 2000, 05] |
| A. | Frenkel |
| B. | Schottky |
| C. | Interstitial |
| D. | \[F-\]centre |
| Answer» C. Interstitial | |
| 6675. |
The flame colours of metal ions are due to [KCET 2003] |
| A. | Frenkel defect |
| B. | Schottky defect |
| C. | Metal deficiency defect |
| D. | Metal excess defect |
| Answer» E. | |
| 6676. |
Which one of the following is the most correct statement |
| A. | Brass is an interstitial alloy, while steel is a substitutional alloy |
| B. | Brass is a substitutional alloy, while steel is an interstitial alloy |
| C. | Brass and steel are both substitutional alloys |
| D. | Brass and steel are both interstitial alloys |
| Answer» D. Brass and steel are both interstitial alloys | |
| 6677. |
Frenkel and Schottky defects are [BHU 2003] |
| A. | Nucleus defects |
| B. | Non-crystal defects |
| C. | Crystal defects |
| D. | None of these |
| Answer» D. None of these | |
| 6678. |
In \[AgBr\] crystal, the ion size lies in the order \[A{{g}^{+}} |
| A. | Defectless (perfect) crystal |
| B. | Schottky defect only |
| C. | Frenkel defect only |
| D. | Both Schottky and Frenkel defects |
| Answer» D. Both Schottky and Frenkel defects | |
| 6679. |
If a non-metal is added to the interstitial sites of a metal then the metal becomes [DCE 2001] |
| A. | Softer |
| B. | Less tensile |
| C. | Less malleable |
| D. | More ductile |
| Answer» C. Less malleable | |
| 6680. |
Point defects are present in [MP PMT 1997] |
| A. | Ionic solids |
| B. | Molecular solids |
| C. | Amorphous solids |
| D. | Liquids |
| Answer» B. Molecular solids | |
| 6681. |
Due to Frenkel defect, the density of ionic solids [MP PET 1996; MP PMT 2002] |
| A. | Increases |
| B. | Decreases |
| C. | Does not change |
| D. | Changes |
| Answer» D. Changes | |
| 6682. |
The following is not a function of an impurity present in a crystal [MP PET 1995] |
| A. | Establishing thermal equilibrium |
| B. | Having tendency to diffuse |
| C. | Contributing to scattering |
| D. | Introducing new electronic energy levels |
| Answer» B. Having tendency to diffuse | |
| 6683. |
Ionic solids, with Schottky defects, contain in their structure [CBSE PMT 1994] |
| A. | Equal number of cation and anion vacancies |
| B. | Anion vacancies and interstitial anions |
| C. | Cation vacancies only |
| D. | Cation vacancies and interstitial cations |
| Answer» B. Anion vacancies and interstitial anions | |
| 6684. |
Schottky defect in crystals is observed when [CBSE PMT 1998; KCET 2002] |
| A. | Density of crystal is increased |
| B. | Unequal number of cations and anions are missing from the lattice |
| C. | An ion leaves its normal site and occupies an interstitial site |
| D. | Equal number of cations and anions are missing from the lattice |
| Answer» E. | |
| 6685. |
Certain crystals produce electric signals on application of pressure. This phenomenon is called [BHU 2005] |
| A. | Pyroelectricity |
| B. | Ferroelectricity |
| C. | Peizoelectricity |
| D. | Ferrielectricity |
| Answer» D. Ferrielectricity | |
| 6686. |
In a face-centered cubic lattice, a unit cell is shared equally by how many unit cells [CBSE PMT 2005] |
| A. | 8 |
| B. | 4 |
| C. | 2 |
| D. | 6 |
| Answer» E. | |
| 6687. |
Example of unit cell with crystallographic dimensions \[a\ne b\ne c,\,\,\alpha =\gamma ={{90}^{o}},\,\,\beta \ne {{90}^{o}}\] is [AFMC 1998] |
| A. | Calcite |
| B. | Graphite |
| C. | Rhombic sulphur |
| D. | Monoclinic sulphur |
| Answer» E. | |
| 6688. |
How many space lattices are obtainable from the different crystal systems [MP PMT 1996; MP PET/PMT 1998] |
| A. | 7 |
| B. | 14 |
| C. | 32 |
| D. | 230 |
| Answer» C. 32 | |
| 6689. |
Space lattice of \[Ca{{F}_{2}}\] is [MP PMT 1993] |
| A. | Face centred cubic |
| B. | Body centred cubic |
| C. | Simple cubic |
| D. | Hexagonal closed packing |
| Answer» B. Body centred cubic | |
| 6690. |
Rhombic sulphur has the following structure |
| A. | Open chain |
| B. | Tetrahedral |
| C. | Puckered 6-membered ring |
| D. | Puckered 8-membered ring |
| Answer» E. | |
| 6691. |
An \[fcc\] unit cell of aluminum contains the equivalent of how many atoms [DCE 2003] |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» E. | |
| 6692. |
Tetragonal crystal system has the following unit cell dimensions [MP PMT 1993] |
| A. | \[a=b=c\] and \[\alpha =\beta =\gamma ={{90}^{o}}\] |
| B. | \[a=b\ne c\] and \[\alpha =\beta =\gamma ={{90}^{o}}\] |
| C. | \[a\ne b\ne c\] and \[\alpha =\beta =\gamma ={{90}^{o}}\] |
| D. | \[a=b\ne c\] and \[\alpha =\beta ={{90}^{o}},\,\,\,\gamma ={{120}^{o}}\] |
| Answer» C. \[a\ne b\ne c\] and \[\alpha =\beta =\gamma ={{90}^{o}}\] | |
| 6693. |
The number of tetrahedral voids in the unit cell of a face centered cubic lattice of similar atoms is [Kerala PMT 2004] |
| A. | 4 |
| B. | 6 |
| C. | 8 |
| D. | 10 |
| Answer» D. 10 | |
| 6694. |
The structure of \[N{{a}_{2}}O\] crystal is |
| A. | \[CsCl\] type |
| B. | \[NaCl\] type |
| C. | \[ZnS\] type |
| D. | Antifluorite |
| Answer» E. | |
| 6695. |
The crystal system of a compound with unit cell dimensions\[a=0.387\], \[b=0.387\] and \[c=0.504nm\] and \[\alpha =\beta ={{90}^{o}}\] and \[\gamma ={{120}^{o}}\] is [AIIMS 2004] |
| A. | Cubic |
| B. | Hexagonal |
| C. | Orthorhombic |
| D. | Rhombohedral |
| Answer» C. Orthorhombic | |
| 6696. |
Structure similar to zinc blende is found in |
| A. | \[AgCl\] |
| B. | \[NaCl\] |
| C. | \[CuCl\] |
| D. | \[TlCl\] |
| Answer» D. \[TlCl\] | |
| 6697. |
The structure of \[TlCl\] is similar to \[CsCl.\] What would be the radius ratio in \[TlCl\] |
| A. | \[0.155-0.225\] |
| B. | \[0.225-0.414\] |
| C. | \[0.414-0.732\] |
| D. | \[0.732-1.000\] |
| Answer» E. | |
| 6698. |
Bravais lattices are of [MP PMT 1997] |
| A. | 8 types |
| B. | 12 types |
| C. | 14 types |
| D. | 9 types |
| Answer» D. 9 types | |
| 6699. |
Which of the following is correct [DPMT 1997] |
| A. | Crystal systemAxial distanceAxial anglesExamplesCubic\[a\ne ~b=c\]\[\alpha =\beta \ne \gamma =90{}^\circ \]\[Cu,\text{ }KCl\] |
| B. | Crystal systemAxial distanceAxial anglesExamplesMonoclinic\[a\ne ~b=c\]\[\alpha =\beta =\gamma =90{}^\circ \]\[PbCr{{O}_{2}},PbCr{{O}_{4}}\] |
| C. | Crystal systemAxial distanceAxial anglesExamplesRhombohedral\[a=~b=c\]\[\alpha =\beta =\gamma \ne 90{}^\circ \]\[CaC{{O}_{3}},\text{ }HgS\] |
| D. | Crystal systemAxial distanceAxial anglesExamplesTriclinic\[a=~b=c\]\[\alpha \ne \beta =\gamma \ne 90{}^\circ \]\[{{K}_{2}}C{{r}_{2}}{{O}_{7}},\text{ }CuS{{O}_{4}}.\text{ }5{{H}_{2}}O\] |
| Answer» D. Crystal systemAxial distanceAxial anglesExamplesTriclinic\[a=~b=c\]\[\alpha \ne \beta =\gamma \ne 90{}^\circ \]\[{{K}_{2}}C{{r}_{2}}{{O}_{7}},\text{ }CuS{{O}_{4}}.\text{ }5{{H}_{2}}O\] | |
| 6700. |
Monoclinic crystal has dimension [DCE 2000] |
| A. | \[a\ne b\ne c,\,\alpha =\gamma =90{}^\circ ,\,\beta \ne 90{}^\circ \] |
| B. | \[a=b=c,\,\alpha =\beta =\gamma =90{}^\circ \] |
| C. | \[a=b\ne c,\,\alpha =\beta =\gamma =90{}^\circ \] |
| D. | \[a\ne b\ne c,\,\alpha \ne \beta \ne \gamma \ne 90{}^\circ \] |
| Answer» B. \[a=b=c,\,\alpha =\beta =\gamma =90{}^\circ \] | |