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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.
| 6151. |
Which of the following conditions represents an equilibrium |
| A. | Freezing of ice in a open vessel, temperature of ice is constant |
| B. | Few drops of water is present along with air in a balloon, temperature of balloon is constant |
| C. | Water is boiling in an open vessel over stove, temperature of water is constant |
| D. | All the statements A, B and C are correct for the equilibrium |
| Answer» C. Water is boiling in an open vessel over stove, temperature of water is constant | |
| 6152. |
In chemical reaction \[A\]⇌\[B\], the system will be known in equilibrium when [MP PMT 1990; NCERT 1977] |
| A. | A completely changes to B |
| B. | 50% of A changes to B |
| C. | The rate of change of A to B and B to A on both the sides are same |
| D. | Only 10% of A changes to B |
| Answer» D. Only 10% of A changes to B | |
| 6153. |
When rate of forward reaction becomes equal to backward reaction, this state is termed as [NCERT 1975, 80; CPMT 1973, 74, 77] |
| A. | Chemical equilibrium |
| B. | Reversible state |
| C. | Equilibrium |
| D. | All of these |
| Answer» B. Reversible state | |
| 6154. |
In any chemical reaction, equilibrium is supposed to be establish when [CPMT 1974, 80, 89; EAMCET 1975, 77, 79; MP PMT 1990; NCERT 1980; MP PET 1995] |
| A. | Mutual opposite reactions undergo |
| B. | Concentration of reactants and resulting products are equal |
| C. | Velocity of mutual reactions become equal |
| D. | The temperature of mutual opposite reactions become equal |
| Answer» D. The temperature of mutual opposite reactions become equal | |
| 6155. |
If the solution boils at a temperature \[{{T}_{1}}\] and the solvent at a temperature \[{{T}_{2}}\] the elevation of boiling point is given by [MP PET 1996] |
| A. | \[{{T}_{1}}+{{T}_{2}}\] |
| B. | \[{{T}_{1}}-{{T}_{2}}\] |
| C. | \[{{T}_{2}}-{{T}_{1}}\] |
| D. | \[{{T}_{1}}\div {{T}_{2}}\] |
| Answer» C. \[{{T}_{2}}-{{T}_{1}}\] | |
| 6156. |
Which of the following statements is correct for the boiling point of solvent containing a dissolved solid substance [NCERT 1972, 74] |
| A. | Boiling point of the liquid is depressed |
| B. | Boiling point of the liquid is elevated |
| C. | There is no effect on the boiling point |
| D. | The change depends upon the polarity of liquid |
| Answer» C. There is no effect on the boiling point | |
| 6157. |
When a substance is dissolved in a solvent, the vapour pressure of solvent decreases. It brings [BHU 2004] |
| A. | A decrease in boiling point of solution |
| B. | An increase in boiling point of the solution |
| C. | A decrease in freezing point of the solution |
| D. | An increase in freezing point of the solution |
| Answer» C. A decrease in freezing point of the solution | |
| 6158. |
Pressure cooker reduces cooking time for food because [MP PMT 1987; NCERT 1975; CPMT 1991; AIEEE 2003] |
| A. | Heat is more evenly distributed in the cooking space |
| B. | Boiling point of water involved in cooking is increased |
| C. | The higher pressure inside the cooker crushes the food material |
| D. | Cooking involves chemical changes helped by a rise in temperature |
| Answer» C. The higher pressure inside the cooker crushes the food material | |
| 6159. |
If \[0.15\,g\] of a solute dissolved in \[15\,g\] of solvent is boiled at a temperature higher by \[{{0.216}^{o}}C\] than that of the pure solvent. The molecular weight of the substance (molal elevation constant for the solvent is \[{{2.16}^{o}}C\]) is [CBSE PMT 1999; BHU 1997] |
| A. | 1.01 |
| B. | 10 |
| C. | 10.1 |
| D. | 100 |
| Answer» E. | |
| 6160. |
The rise in the boiling point of a solution containing 1.8 gram of glucose in \[100g\] of a solvent in \[{{0.1}^{o}}C\]. The molal elevation constant of the liquid is [CPMT 1999] |
| A. | 0.01 \[K/m\] |
| B. | \[0.1\,K/m\] |
| C. | \[1\,K/m\] |
| D. | \[10\,K/m\] |
| Answer» D. \[10\,K/m\] | |
| 6161. |
Mark the correct relationship between the boiling points of very dilute solutions of \[BaC{{l}_{2}}\,({{t}_{1}})\] and \[KCl\,({{t}_{2}})\], having the same molarity [CPMT 1984, 93] |
| A. | \[{{t}_{1}}={{t}_{2}}\] |
| B. | \[{{t}_{1}}>{{t}_{2}}\] |
| C. | \[{{t}_{2}}>{{t}_{1}}\] |
| D. | \[{{t}_{2}}\] is approximately equal to \[{{t}_{1}}\] |
| Answer» C. \[{{t}_{2}}>{{t}_{1}}\] | |
| 6162. |
A solution of 1 molal concentration of a solute will have maximum boiling point elevation when the solvent is [MP PMT 2000] |
| A. | Ethyl alcohol |
| B. | Acetone |
| C. | Benzene |
| D. | Chloroform |
| Answer» D. Chloroform | |
| 6163. |
The elevation in boiling point for one molal solution of a solute in a solvent is called [MH CET 2001] |
| A. | Boiling point constant |
| B. | Molal elevation constant |
| C. | Cryoscopic constant |
| D. | None of these |
| Answer» C. Cryoscopic constant | |
| 6164. |
At higher altitudes the boiling point of water lowers because [NCERT 1972; CPMT 1994; J & K 2005] |
| A. | Atmospheric pressure is low |
| B. | Temperature is low |
| C. | Atmospheric pressure is high |
| D. | None of these |
| Answer» B. Temperature is low | |
| 6165. |
When common salt is dissolved in water [CBSE PMT 1988; MP PET 1995; DCE 2000] |
| A. | Melting point of the solution increases |
| B. | Boiling point of the solution increases |
| C. | Boiling point of the solution decreases |
| D. | Both melting point and boiling point decreases |
| Answer» C. Boiling point of the solution decreases | |
| 6166. |
An aqueous solution containing 1g of urea boils at \[{{100.25}^{o}}C\]. The aqueous solution containing 3 g of glucose in the same volume will boil at (Molecular weight of urea and glucose are 60 and 180 respectively) [CBSE PMT 2000] |
| A. | \[{{100.75}^{o}}C\] |
| B. | \[{{100.5}^{o}}C\] |
| C. | \[{{100.25}^{o}}C\] |
| D. | \[{{100}^{o}}C\] |
| Answer» D. \[{{100}^{o}}C\] | |
| 6167. |
When 10g of a non-volatile solute is dissolved in 100 g of benzene, it raises boiling point by \[{{1}^{o}}C\] then molecular mass of the solute is \[({{K}_{b}}\]for benzene =2.53k-m?1) [BHU 2002] |
| A. | 223 g |
| B. | 233 g |
| C. | 243 g |
| D. | 253 g |
| Answer» E. | |
| 6168. |
The elevation in boiling point of a solution of 13.44g of CuCl2 in 1kg of water using the following information will be (Molecular weight of CuCl2 = 134.4 and Kb = 0.52 K molal-1) [IIT 2005] |
| A. | 0.16 |
| B. | 0.05 |
| C. | 0.1 |
| D. | 0.2 |
| Answer» B. 0.05 | |
| 6169. |
The temperature, at which the vapour pressure of a liquid becomes equal to the atmospheric pressure is known as [Pb. PMT 2000] |
| A. | Freezing point |
| B. | Boiling point |
| C. | Absolute temperature |
| D. | None of these |
| Answer» C. Absolute temperature | |
| 6170. |
Value of gas constant R is [AIEEE 2002] |
| A. | 0.082 litre atm |
| B. | 0.987 cal \[mo{{l}^{-1}}{{K}^{-1}}\] |
| C. | 8.3 J \[mo{{l}^{-1}}{{K}^{-1}}\] |
| D. | 83 erg \[mo{{l}^{-1}}{{K}^{-1}}\] |
| Answer» D. 83 erg \[mo{{l}^{-1}}{{K}^{-1}}\] | |
| 6171. |
The molal boiling point constant for water is \[{{0.513}^{o}}C\,kg\,mo{{l}^{-1}}\]. When 0.1 mole of sugar is dissolved in \[200ml\] of water, the solution boils under a pressure of one atmosphere at [AIIMS 1991] |
| A. | \[{{100.513}^{o}}C\] |
| B. | \[{{100.0513}^{o}}C\] |
| C. | \[{{100.256}^{o}}C\] |
| D. | \[{{101.025}^{o}}C\] |
| Answer» D. \[{{101.025}^{o}}C\] | |
| 6172. |
The molal elevation constant is the ratio of the elevation in B.P. to [CPMT 1982] |
| A. | Molarity |
| B. | Molality |
| C. | Mole fraction of solute |
| D. | Mole fraction of solvent |
| Answer» C. Mole fraction of solute | |
| 6173. |
If for a sucrose solution elevation in boiling point is 0.1°C then what will be the boiling point of NaCl solution for same molal concentration [BHU 1998, 2005] |
| A. | \[0.1{}^\circ C\] |
| B. | \[0.2{}^\circ C\] |
| C. | \[0.08{}^\circ C\] |
| D. | \[0.01{}^\circ C\] |
| Answer» C. \[0.08{}^\circ C\] | |
| 6174. |
The latent heat of vapourisation of water is \[9700\,Cal/mole\] and if the b.p. is \[{{100}^{o}}C\], ebullioscopic constant of water is [CBSE PMT 1989] |
| A. | \[{{0.513}^{o}}C\] |
| B. | \[{{1.026}^{o}}C\] |
| C. | \[{{10.26}^{o}}C\] |
| D. | \[{{1.832}^{o}}C\] |
| Answer» B. \[{{1.026}^{o}}C\] | |
| 6175. |
In the following which substance will have highest boiling point [NCERT 1973; MP PMT 1990] |
| A. | \[He\] |
| B. | \[CsF\] |
| C. | \[N{{H}_{3}}\] |
| D. | \[CHC{{l}_{3}}\] |
| Answer» C. \[N{{H}_{3}}\] | |
| 6176. |
Electrovalent bond formation depends on |
| A. | Ionization energy |
| B. | Electron affinity |
| C. | Lattice energy |
| D. | All the three above |
| Answer» E. | |
| 6177. |
Which of the following conduct electricity in the fused state [Roorkee 2000] |
| A. | \[BeC{{l}_{2}}\] |
| B. | \[MgC{{l}_{2}}\] |
| C. | \[SrC{{l}_{2}}\] |
| D. | \[BaC{{l}_{2}}\] |
| Answer» C. \[SrC{{l}_{2}}\] | |
| 6178. |
Which of the following hydrides are ionic [Roorkee 1999] |
| A. | \[Ca{{H}_{2}}\] |
| B. | \[Ba{{H}_{2}}\] |
| C. | \[Sr{{H}_{2}}\] |
| D. | \[Be{{H}_{2}}\] |
| Answer» B. \[Ba{{H}_{2}}\] | |
| 6179. |
Which of the following statements is not true for ionic compounds [RPET 2003] |
| A. | High melting point |
| B. | Least lattice energy |
| C. | Least solubility in organic compounds |
| D. | Soluble in water |
| Answer» C. Least solubility in organic compounds | |
| 6180. |
Which of the following has highest melting point [RPET 2003] |
| A. | \[BeC{{l}_{2}}\] |
| B. | \[MgC{{l}_{2}}\] |
| C. | \[CaC{{l}_{2}}\] |
| D. | \[BaC{{l}_{2}}\] |
| Answer» E. | |
| 6181. |
The energy that opposes dissolution of a solvent is [CPMT 2002] |
| A. | Hydration energy |
| B. | Lattice energy |
| C. | Internal energy |
| D. | Bond energy |
| Answer» E. | |
| 6182. |
Which of the following pairs of species has same electronic configuration [UPSEAT 2002] |
| A. | \[Z{{n}^{2+}}\] and \[N{{i}^{2+}}\] |
| B. | \[C{{o}^{+3}}\] and \[N{{i}^{4+}}\] |
| C. | \[C{{o}^{2+}}\] and \[N{{i}^{2+}}\] |
| D. | \[T{{i}^{4+}}\] and \[{{V}^{3+}}\] |
| Answer» C. \[C{{o}^{2+}}\] and \[N{{i}^{2+}}\] | |
| 6183. |
The interionic attraction depends on interaction of [Kerala CET (Med.) 2002] |
| A. | Solute-Solute |
| B. | Solvent-Solvent |
| C. | The charges |
| D. | Molecular properties |
| Answer» D. Molecular properties | |
| 6184. |
A electrovalent compound is made up of [CPMT 1978, 81; MNR 1979] |
| A. | Electrically charged molecules |
| B. | Neutral molecules |
| C. | Neutral atoms |
| D. | Electrically charged atoms or group of atoms |
| Answer» E. | |
| 6185. |
Which one is the strongest bond [Pb. PMT 2001] |
| A. | \[BrF\] |
| B. | \[FF\] |
| C. | \[ClF\] |
| D. | \[BrCl\] |
| Answer» B. \[FF\] | |
| 6186. |
Bond formed in crystal by anion and cation is [CBSE PMT 2000] |
| A. | Ionic |
| B. | Metallic |
| C. | Covalent |
| D. | Dipole |
| Answer» B. Metallic | |
| 6187. |
An atom with atomic number 20 is most likely to combine chemically with the atom whose atomic number is [BHU 2000] |
| A. | 11 |
| B. | 14 |
| C. | 16 |
| D. | 10 |
| Answer» D. 10 | |
| 6188. |
Which type of bonding exists in \[L{{i}_{2}}O\] and \[Ca{{F}_{2}}\] respectively [RPET 2000] |
| A. | Ionic, ionic |
| B. | Ionic, covalent |
| C. | Covalent, ionic |
| D. | Coordinate, ionic |
| Answer» B. Ionic, covalent | |
| 6189. |
Which of the following is least ionic [MP PET 2002] |
| A. | \[{{C}_{2}}{{H}_{5}}Cl\] |
| B. | \[KCl\] |
| C. | \[BaC{{l}_{2}}\] |
| D. | \[{{C}_{6}}{{H}_{5}}{{N}^{+}}{{H}_{3}}C{{l}^{-}}\] |
| Answer» B. \[KCl\] | |
| 6190. |
An element X with the electronic configuration \[1{{s}^{2}},\,2{{s}^{2}}2{{p}^{6}},\,3{{s}^{2}}\] would be expected to form the chloride with the formula [JIPMER 2000] |
| A. | \[XC{{l}_{3}}\] |
| B. | \[XC{{l}_{2}}\] |
| C. | \[XCl\] |
| D. | \[{{X}_{2}}Cl\] |
| Answer» C. \[XCl\] | |
| 6191. |
Highest melting point would be of [RPMT 1999] |
| A. | \[He\] |
| B. | \[CsCl\] |
| C. | \[N{{H}_{3}}\] |
| D. | \[CHC{{l}_{3}}\] |
| Answer» C. \[N{{H}_{3}}\] | |
| 6192. |
What is the effect of more electronegative atom on the strength of ionic bond [AMU 1999] |
| A. | Decreases |
| B. | Increases |
| C. | Decreases slowly |
| D. | Remains the same |
| Answer» C. Decreases slowly | |
| 6193. |
Electrovalent compound's [MP PMT 1984] |
| A. | Melting points are low |
| B. | Boiling points are low |
| C. | Conduct current in fused state |
| D. | Insoluble in polar solvent |
| Answer» D. Insoluble in polar solvent | |
| 6194. |
Ionic compounds do not have [RPMT 1997] |
| A. | Hard and brittle nature |
| B. | High melting and boiling point |
| C. | Directional properties |
| D. | Soluble in polar solvents |
| Answer» D. Soluble in polar solvents | |
| 6195. |
The main reaction during electrovalent bond formation is |
| A. | Redox reaction |
| B. | Substitution reaction |
| C. | Addition reaction |
| D. | Elimination reaction |
| Answer» B. Substitution reaction | |
| 6196. |
Electrovalent compounds are [CPMT 1996] |
| A. | Good conductor of electricity |
| B. | Polar in nature |
| C. | Low M.P. and low B.P. |
| D. | Easily available |
| Answer» C. Low M.P. and low B.P. | |
| 6197. |
The high melting point and insolubility in organic solvents of sulphanilic acid are due to its ...... structure. [IIT 1994] |
| A. | Simple ionic |
| B. | Bipolar ionic |
| C. | Cubic |
| D. | Hexagonal |
| Answer» C. Cubic | |
| 6198. |
Which of the following halides has maximum melting point |
| A. | \[NaCl\] |
| B. | \[NaBr\] |
| C. | \[NaI\] |
| D. | \[NaF\] |
| Answer» E. | |
| 6199. |
Which of the following is least soluble [CPMT 1989] |
| A. | \[Be{{F}_{2}}\] |
| B. | \[Sr{{F}_{2}}\] |
| C. | \[Ca{{F}_{2}}\] |
| D. | \[Mg{{F}_{2}}\] |
| Answer» C. \[Ca{{F}_{2}}\] | |
| 6200. |
Among the bonds formed by a chlorine atom with atoms of hydrogen, chlorine, sodium and carbon, the strongest bond is formed between [EAMCET 1988; MP PMT 1993] |
| A. | \[H-Cl\] |
| B. | \[Cl-Cl\] |
| C. | \[Na-Cl\] |
| D. | \[C-Cl\] |
| Answer» D. \[C-Cl\] | |