MCQOPTIONS
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MCQOPTIONS
This section includes 657 Mcqs, each offering curated multiple-choice questions to sharpen your Testing Subject knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Keeping in view the periodic law and the periodic table suggest which of the following elements should have the maximum electronegative character [MNR 1985] |
| A. | P |
| B. | As |
| C. | Bi |
| D. | Sb |
| Answer» B. As | |
| 2. |
Which element has the highest electronegativity [MP PET/PMT 1998] |
| A. | C |
| B. | Mg |
| C. | O |
| D. | S |
| Answer» D. S | |
| 3. |
On going from right to left in a period in the periodic table the electronegativity of the elements [MP PET/PMT 1998; MP PMT 2002] |
| A. | Increases |
| B. | Decreases |
| C. | Remain unchanged |
| D. | Decreases first then increases |
| Answer» C. Remain unchanged | |
| 4. |
Between \[HF,HCl,HBr\] and \[HI,HF\] has the highest ionic character because |
| A. | F has the highest electron affinity |
| B. | In \[HF\], electronegativity difference is highest |
| C. | \[{{F}^{-}}\] ion has the highest value of ionic radius |
| D. | Atomic orbitals of H and F have almost similar energy |
| Answer» C. \[{{F}^{-}}\] ion has the highest value of ionic radius | |
| 5. |
Electron affinity is the [MP PMT 1993] |
| A. | Energy absorbed when an electron is added to an isolated atom in the gaseous state |
| B. | Energy released when an electron is added to an isolated atom in the gaseous state |
| C. | Energy required to take out an electron from an isolated gaseous atom |
| D. | Power of an atom to attract an electron to itself |
| Answer» C. Energy required to take out an electron from an isolated gaseous atom | |
| 6. |
Which one of the following is an incorrect statement [MP PMT 2001] |
| A. | The ionisation potential of nitrogen is greater than that of oxygen |
| B. | The electron affinity of fluorine is greater than that of chlorine |
| C. | The ionisation potential of beryllium is greater than that of boron |
| D. | The electronegativity of fluorine is greater than that of chlorine |
| Answer» C. The ionisation potential of beryllium is greater than that of boron | |
| 7. |
The electron affinities of halogens are \[F=322\], \[Cl=349\], \[Br=324\], \[I=295kJ\,mo{{l}^{-1}}\]. The higher value for \[Cl\] as compared to that of \[F\] is due to [MP PMT 1997] |
| A. | Weaker electron-electron repulsion in \[Cl\] |
| B. | Higher atomic radius of \[F\] |
| C. | Smaller electronegativity of \[F\] |
| D. | More vacant P - subshell in \[Cl\] |
| Answer» B. Higher atomic radius of \[F\] | |
| 8. |
Order of electron affinity of \[F,\ Cl,\ Br\]and I is..... [AFMC 1999; Orissa JEE 2004,05] |
| A. | \[F<Cl>Br>I\] |
| B. | \[F>Cl>Br>I\] |
| C. | \[F<Cl<Br<I\] |
| D. | \[F>Cl<Br>I\] |
| Answer» B. \[F>Cl>Br>I\] | |
| 9. |
Which of the following properties show gradual decrease with increase in atomic number across a period in the periodic table [Pb. CET 2003] |
| A. | Electron affinity |
| B. | Ionization potential |
| C. | Electronegativity |
| D. | Size of atom |
| Answer» E. | |
| 10. |
Electron affinity is the lowest for |
| A. | Nitrogen |
| B. | Carbon |
| C. | Oxygen |
| D. | Sulphur |
| Answer» C. Oxygen | |
| 11. |
Increasing order of electron affinity is [RPET 2003] |
| A. | \[N<O<Cl<Al\] |
| B. | \[O<N<Al<Cl\] |
| C. | \[Al<N<O<Cl\] |
| D. | \[Cl<N<O<Al\] |
| Answer» D. \[Cl<N<O<Al\] | |
| 12. |
Nitrogen has lower electron affinity than its preceeding element carbon because |
| A. | Electron affinity decreases along a period |
| B. | Electron affinity generally increases along a period |
| C. | Nitrogen atom has half filled p-orbital |
| D. | Nitrogen is a p-block element |
| Answer» C. Nitrogen atom has half filled p-orbital | |
| 13. |
The electron affinity values (in \[kJ\,mo{{l}^{-1}}\]) of three halogens \[X,\,Y\] and \[Z\] are respectively - 349, - 333 and - 325. Then \[X,\,Y\] and \[Z\] are respectively [EAMCET 2003] |
| A. | \[{{F}_{2}},\,C{{l}_{2}}\] and \[B{{r}_{2}}\] |
| B. | \[C{{l}_{2}},\,{{F}_{2}}\] and \[B{{r}_{2}}\] |
| C. | \[C{{l}_{2}},\,B{{r}_{2}}\] and \[{{F}_{2}}\] |
| D. | \[B{{r}_{2}},\,C{{l}_{2}}\] and \[{{F}_{2}}\] |
| Answer» C. \[C{{l}_{2}},\,B{{r}_{2}}\] and \[{{F}_{2}}\] | |
| 14. |
Which of the following species has the highest electron affinity [KCET 1996] |
| A. | \[F\] |
| B. | \[O\] |
| C. | \[{{O}^{-}}\] |
| D. | \[N{{a}^{+}}\] |
| Answer» B. \[O\] | |
| 15. |
The amount of energy which is released due to addition of extra electron to the outermost orbit of gaseous atom is called [BHU 1996] |
| A. | Electron capacity |
| B. | Electron affinity |
| C. | Ionisation potential |
| D. | Electronegativity |
| Answer» C. Ionisation potential | |
| 16. |
For electron affinity of halogens which of the following is correct [AIIMS 2004] |
| A. | \[Br>F\] |
| B. | \[F>Cl\] |
| C. | \[Br<Cl\] |
| D. | \[F>I\] |
| Answer» D. \[F>I\] | |
| 17. |
Fluorine has low electron affinity than chlorine because of [CPMT 1997] |
| A. | Smaller radius of fluorine, high density |
| B. | Smaller radius of chlorine, high density |
| C. | Bigger radius of fluorine, less density |
| D. | Smaller radius of chlorine, less density |
| Answer» B. Smaller radius of chlorine, high density | |
| 18. |
Electron affinity depends on [MP PMT 2002] |
| A. | Atomic size |
| B. | Nuclear charge |
| C. | Atomic number |
| D. | Atomic size and nuclear charge both |
| Answer» E. | |
| 19. |
On the electrolysis of aqueous solution of sodium sulphate, on cathode we get [MP PMT 1992, 2002] |
| A. | \[Na\] |
| B. | \[{{H}_{2}}\] |
| C. | \[S{{O}_{2}}\] |
| D. | \[S{{O}_{3}}\] |
| Answer» C. \[S{{O}_{2}}\] | |
| 20. |
Electrolyte can conduct electricity because |
| A. | Their molecules contain unpaired electrons, which are mobile |
| B. | Their molecules contain loosely held electrons which get free under the influence of voltage |
| C. | The molecules break up into ions when a voltage is applied |
| D. | The molecules are broken up into ions when the electrolyte is fused or is dissolved in the solvent |
| Answer» E. | |
| 21. |
Which one of the following metals could not be obtained on electrolysis of aqueous solution of its salts [IIT 1990] |
| A. | \[Ag\] |
| B. | \[Mg\] |
| C. | \[Cu\] |
| D. | \[Cr\] |
| Answer» C. \[Cu\] | |
| 22. |
Electrolytes when dissolved in water dissociates into ions because [CPMT 1974, 78; MNR 1983] |
| A. | They are unstable |
| B. | The water dissolves it |
| C. | The force of repulsion increases |
| D. | The forces of electrostatic attraction are broken down by water |
| Answer» E. | |
| 23. |
Which of the following is not a non electrolyte [J & K 2005] |
| A. | Acetic acid |
| B. | Glucose |
| C. | Ethanol |
| D. | Urea |
| Answer» B. Glucose | |
| 24. |
An electrolyte [KCET 1984; MP PET/PMT 1988] |
| A. | Forms complex ions in solution |
| B. | Gives ions only when electricity is passed |
| C. | Possesses ions even in solid state |
| D. | Gives ions only when dissolved in water |
| Answer» D. Gives ions only when dissolved in water | |
| 25. |
Which one of the following material conducts electricity [Kerala (Med.) 2003] |
| A. | Diamond |
| B. | Crystalline sodium chloride |
| C. | Barium sulphate |
| D. | Fused potassium chloride |
| E. | Molten sulphur |
| Answer» E. Molten sulphur | |
| 26. |
Which of the following liberate hydrogen on reaction with dilute \[{{H}_{2}}S{{O}_{4}}\] [Roorkee 2000] |
| A. | \[Fe\] |
| B. | \[Cu\] |
| C. | \[Al\] |
| D. | \[Hg\] |
| Answer» D. \[Hg\] | |
| 27. |
Which of the following properties of pure metal makes it more useful then the corresponding alloy [RPET 2000] |
| A. | It is harder than corresponding alloy |
| B. | It has high density |
| C. | It can be extracted easily |
| D. | It conducts heat and electricity easily |
| Answer» E. | |
| 28. |
Electrolysis of molten anhydrous calcium chloride produces [AIIMS 2000] |
| A. | Calcium |
| B. | Phosphorus |
| C. | Sulphur |
| D. | Sodium |
| Answer» B. Phosphorus | |
| 29. |
During electrolysis, the species discharged at cathode are [AFMC 2000] |
| A. | Ions |
| B. | Cation |
| C. | Anion |
| D. | All of these |
| Answer» C. Anion | |
| 30. |
Which of the following is non-electrolytes [KCET (Med.) 1999] |
| A. | \[NaCl\] |
| B. | \[CaC{{l}_{2}}\] |
| C. | \[{{C}_{12}}{{H}_{22}}{{O}_{11}}\] |
| D. | \[C{{H}_{3}}COOH\] |
| Answer» D. \[C{{H}_{3}}COOH\] | |
| 31. |
When a molten ionic hydride is electrolysed [JIPMER 1999] |
| A. | Hydrogen is liberated at the cathode |
| B. | Hydrogen is liberated at the anode |
| C. | There is no reaction |
| D. | \[{{H}^{-}}\] ions produced migrate to the cathode |
| Answer» C. There is no reaction | |
| 32. |
Degree of ionisation of a solution depends upon [BHU 1998] |
| A. | Temperature |
| B. | Nature of the electrolyte |
| C. | Nature of the solvent |
| D. | None of these |
| Answer» E. | |
| 33. |
Electrolysis is a process in which the cations and anions of the electrolyte are [MP PET 1995] |
| A. | Hydrated |
| B. | Hydrolysed |
| C. | Charged |
| D. | Discharged |
| Answer» E. | |
| 34. |
Sodium is made by the electrolysis of a molten mixture of about 40% \[NaCl\] and 60% \[CaC{{l}_{2}}\] because [CBSE PMT 1995] |
| A. | \[CaC{{l}_{2}}\] helps in conduction of electricity |
| B. | This mixture has a lower melting point than \[NaCl\] |
| C. | \[C{{a}^{++}}\] can displace \[Na\] from \[NaCl\] |
| D. | \[C{{a}^{++}}\] can reduce \[NaCl\] to \[Na\] |
| Answer» C. \[C{{a}^{++}}\] can displace \[Na\] from \[NaCl\] | |
| 35. |
In aqueous solution, strong electrolytes [AMU 1983, 84] |
| A. | Are partially ionized |
| B. | Do not ionise |
| C. | Ionise almost completely |
| D. | Form polymers |
| Answer» D. Form polymers | |
| 36. |
Use of electrolysis is [AFMC 1995] |
| A. | Electroplating |
| B. | Electrorefining |
| C. | A and B both |
| D. | None of these |
| Answer» D. None of these | |
| 37. |
In electrolysis of aqueous copper sulphate, the gas at anode and cathode is [AFMC 1995] |
| A. | \[{{O}_{2}}\] and \[{{H}_{2}}\] |
| B. | \[S{{O}_{2}}\] and \[{{H}_{2}}\] |
| C. | \[{{H}_{2}}\] and \[{{O}_{2}}\] |
| D. | \[S{{O}_{3}}\] and \[{{O}_{2}}\] |
| Answer» B. \[S{{O}_{2}}\] and \[{{H}_{2}}\] | |
| 38. |
Which is responsible for electrical conduction of molten sodium chloride [MADT Bihar 1995] |
| A. | Free electrons |
| B. | Free ions |
| C. | Free molecules |
| D. | Atoms of sodium and chlorine |
| Answer» C. Free molecules | |
| 39. |
Pure water does not conduct electricity because it [Manipal MEE 1995] |
| A. | Has a low boiling point |
| B. | Is almost totally unionized |
| C. | Is neutral |
| D. | Is readily decomposed |
| Answer» C. Is neutral | |
| 40. |
The passage of current liberates \[{{H}_{2}}\] at cathode and \[C{{l}_{2}}\] at anode. The solution is [EAMCET 1979,87] |
| A. | Copper chloride in water |
| B. | \[NaCl\] in water |
| C. | \[{{H}_{2}}S{{O}_{4}}\] |
| D. | Water |
| Answer» C. \[{{H}_{2}}S{{O}_{4}}\] | |
| 41. |
When a solution of an electrolyte is heated the conductance of the solution [KCET 1991] |
| A. | Increases because of the electrolyte conducts better |
| B. | Decreases because of the increased heat |
| C. | Decreases because of the dissociation of the electrolyte is suppressed |
| D. | Increases because the electrolyte is dissociated more |
| Answer» E. | |
| 42. |
During electrolysis of \[NaCl\]solution, part of the reaction is \[N{{a}^{+}}+{{e}^{-}}\to Na.\] This is termed as [NCERT 1984] |
| A. | Oxidation |
| B. | Reduction |
| C. | Deposition |
| D. | Cathode reaction |
| Answer» C. Deposition | |
| 43. |
Electrolysis of aqueous \[HCl\] solution produces [CPMT 1987] |
| A. | \[{{H}_{2}}\] gas at the anode |
| B. | \[{{H}_{2}}\] gas at the cathode |
| C. | \[C{{l}_{2}}\] gas at the cathode |
| D. | \[C{{l}_{2}}\] and \[{{O}_{2}}\] gases both at the anode |
| Answer» C. \[C{{l}_{2}}\] gas at the cathode | |
| 44. |
The amount of ion discharged during electrolysis is not directly proportional to [NCERT 1973] |
| A. | Resistance |
| B. | Time |
| C. | Current |
| D. | Chemical equivalent of the ion |
| Answer» B. Time | |
| 45. |
During the electrolysis of fused \[NaCl,\] which reaction occurs at anode [NCERT 1973; AFMC 1992; MP PMT 2002] |
| A. | Chloride ions are oxidized |
| B. | Chloride ions are reduced |
| C. | Sodium ions are oxidised |
| D. | Sodium ions are reduced |
| Answer» B. Chloride ions are reduced | |
| 46. |
Strong electrolytes are those which [MNR 1983] |
| A. | Dissolve readily in water |
| B. | Conduct electricity |
| C. | Dissociate into ions at high dilution |
| D. | Completely dissociate into ions at all dilutions |
| Answer» E. | |
| 47. |
The addition of a polar solvent to a solid electrolyte results in [NCERT 1973] |
| A. | Polarization |
| B. | Association |
| C. | Ionization |
| D. | Non-liberation of heat |
| Answer» D. Non-liberation of heat | |
| 48. |
On electrolysing a solution of dilute \[{{H}_{2}}S{{O}_{4}}\] between platinum electrodes, the gas evolved at the anode is [NCERT 1977, 79; MNR 1980; CBSE PMT 1992] |
| A. | \[S{{O}_{2}}\] |
| B. | \[I{{F}_{5}}\] |
| C. | \[{{O}_{2}}\] |
| D. | \[{{H}_{2}}\] |
| Answer» D. \[{{H}_{2}}\] | |
| 49. |
A solution of sodium sulphate in water is electrolysed using inert electrodes. The products at the cathode and anode are respectively [IIT 1987,96] |
| A. | \[{{H}_{2}},\,\,\,{{O}_{2}}\] |
| B. | \[{{O}_{2}},\,\,{{H}_{2}}\] |
| C. | \[{{O}_{2}},\,\,Na\] |
| D. | \[{{O}_{2}},\,\,S{{O}_{2}}\] |
| Answer» B. \[{{O}_{2}},\,\,{{H}_{2}}\] | |
| 50. |
An electric current is passed through an aqueous solution of the following. Which one shall decompose [NCERT 1972] |
| A. | Urea |
| B. | Glucose |
| C. | \[AgN{{O}_{3}}\] |
| D. | Ethyl alcohol |
| Answer» D. Ethyl alcohol | |