MCQOPTIONS
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MCQOPTIONS
This section includes 80 Mcqs, each offering curated multiple-choice questions to sharpen your Chemistry knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
In following reaction \[yMnO_{4}^{-}+x{{H}^{+}}+{{C}_{2}}O_{4}^{-}\to yM{{n}^{++}}+2C{{O}_{2}}+\frac{x}{2}{{H}_{2}}O\], x and y are [CPMT 1997] |
| A. | 2 and 16 |
| B. | 16 and 2 |
| C. | 8 and 16 |
| D. | 5 and 2 |
| Answer» C. 8 and 16 | |
| 2. |
Which of the following element has maximum density |
| A. | \[Hg\] |
| B. | \[Au\] |
| C. | \[Os\] |
| D. | \[Pb\] |
| Answer» D. \[Pb\] | |
| 3. |
Zinc and mercury do not show variable valency like d-block elements because [RPMT 2000; MP PMT 2000] |
| A. | They are soft |
| B. | Their d- shells are complete |
| C. | They have only two electrons in the outermost subshell |
| D. | Their d-shells are incomplete |
| Answer» C. They have only two electrons in the outermost subshell | |
| 4. |
The transition element have a characteristic electronic configuration which can be represented as [MP PMT/PET 1988; MP PMT 1989] |
| A. | \[(n-2){{s}^{2}}{{p}^{6}}{{d}^{1-10}}(n-1){{s}^{2}}{{p}^{6}}n{{s}^{2}}\] |
| B. | \[(n-2){{s}^{2}}{{p}^{6}}{{d}^{1-10}}(n-1){{s}^{1}}{{p}^{6}}{{d}^{1}}\] or \[{{d}^{1}}n{{s}^{1}}\] |
| C. | \[(n-1){{s}^{1}}{{p}^{6}}{{d}^{10}}n{{s}^{2}}{{p}^{6}}n{{d}^{1-10}}\] |
| D. | \[(n-1){{s}^{2}}{{p}^{6}}{{d}^{1-10}}n{{s}^{1}}\] or \[n{{s}^{2}}\] |
| Answer» E. | |
| 5. |
In the first transition series, the highest B.P. and M.P. is of |
| A. | \[Cr\] |
| B. | \[V\] |
| C. | \[Ni\] |
| D. | \[Fe\] |
| Answer» B. \[V\] | |
| 6. |
Which ion is not coloured [DPMT 2001] |
| A. | \[C{{r}^{3+}}\] |
| B. | \[C{{o}^{2+}}\] |
| C. | \[C{{r}^{2+}}\] |
| D. | \[C{{u}^{+}}\] |
| Answer» E. | |
| 7. |
Elements which generally exhibit multiple oxidation states and whose ions are usually coloured are [NCERT 1973; MP PMT 2000] |
| A. | Metalloids |
| B. | Transition elements |
| C. | Non-metals |
| D. | Gases |
| Answer» C. Non-metals | |
| 8. |
Among the following pairs of ions, the lower oxidation state in aqueous solution is more stable than the other in [AIIMS 2005] |
| A. | \[T{{l}^{+}},\ T{{l}^{3+}}\] |
| B. | \[C{{u}^{+}},\ C{{u}^{2+}}\] |
| C. | \[C{{r}^{2+}},\ C{{r}^{3+}}\] |
| D. | \[{{V}^{2+}},\ V{{O}^{2+}}\] |
| Answer» B. \[C{{u}^{+}},\ C{{u}^{2+}}\] | |
| 9. |
Which one belongs to 3d-transition series [MP PMT 2004] |
| A. | Copper |
| B. | Gold |
| C. | Cobalt |
| D. | Silver |
| Answer» D. Silver | |
| 10. |
Which one of the following is not a transition metal [MP PMT 1999] |
| A. | Chromium |
| B. | Titanium |
| C. | Lead |
| D. | Tungsten |
| Answer» D. Tungsten | |
| 11. |
Which metal represents more than one oxidation state [CPMT 1990] |
| A. | \[Al\] |
| B. | \[Na\] |
| C. | \[Mg\] |
| D. | \[Fe\] |
| Answer» E. | |
| 12. |
Due to covalent bonding, the transitional metals are |
| A. | Lustrous |
| B. | Conductor |
| C. | Hard and brittle |
| D. | Ductile |
| Answer» D. Ductile | |
| 13. |
Which metal does not give the following reaction M + water or steam \[\to \]oxide + H¯ [Pb. PMT 2001] |
| A. | Mercury |
| B. | Iron |
| C. | Sodium |
| D. | Magnesium |
| Answer» B. Iron | |
| 14. |
In which of the following, tendency towards formation of coloured ions is maximum [MP PET 1999] |
| A. | s-block elements |
| B. | d-block elements |
| C. | p-block elements |
| D. | f-block elements |
| Answer» C. p-block elements | |
| 15. |
The correct order of density is |
| A. | \[Cu>Ni>Zn>Sc\] |
| B. | \[Ni>Cu>Zn>Sc\] |
| C. | \[Zn>Cu>Ni>Sc\] |
| D. | \[Sc>Zn>Ni>Cu\] |
| Answer» C. \[Zn>Cu>Ni>Sc\] | |
| 16. |
Thallium shows different oxidation states because [Kurukshetra CEE 1998] |
| A. | It is a transition metal |
| B. | Of inert-pair effect |
| C. | Of its high reactivity |
| D. | Of its amphoteric character |
| Answer» C. Of its high reactivity | |
| 17. |
Which occludes hydrogen |
| A. | \[Os\] |
| B. | \[Pt\] |
| C. | \[Ni\] |
| D. | All of these |
| Answer» E. | |
| 18. |
Which of the following transition metals can have highest oxidation state [RPET 2003] |
| A. | \[Cr\] |
| B. | Co |
| C. | \[Ni\] |
| D. | Cu |
| Answer» D. Cu | |
| 19. |
In solution of \[AgN{{O}_{3,}}\]if Cu is a solution become blue due to [MH CET 2002] |
| A. | Oxidation of Ag |
| B. | Oxidation of Cu |
| C. | Reduction of Ag |
| D. | Reduction of Cu |
| Answer» C. Reduction of Ag | |
| 20. |
In which of the following metallic bond is strongest [MP PET 2003] |
| A. | Fe |
| B. | Sc |
| C. | V |
| D. | Cr |
| Answer» E. | |
| 21. |
Transitional elements exhibit variable valencies because they release electrons from the following orbits [MP PET/PMT 1988; MP PET 1989;UPSEAT 2001] |
| A. | ns orbit |
| B. | ns and np orbits |
| C. | (n - 1)d and ns orbits |
| D. | (n - 1)d orbit |
| Answer» D. (n - 1)d orbit | |
| 22. |
\[M{{n}^{++}}\] can be converted into \[M{{n}^{7+}}\] by reacting with [UPSEAT 2003] |
| A. | \[S{{O}_{2}}\] |
| B. | \[C{{l}_{2}}\] |
| C. | \[Pb{{O}_{2}}\] |
| D. | \[SnC{{l}_{2}}\] |
| Answer» D. \[SnC{{l}_{2}}\] | |
| 23. |
Which one of the following has the maximum number of unpaired electrons [UPSEAT 2001] |
| A. | \[M{{g}^{2+}}\] |
| B. | \[T{{i}^{3+}}\] |
| C. | \[{{V}^{3+}}\] |
| D. | \[F{{e}^{2+}}\] |
| Answer» E. | |
| 24. |
Which of the following ions form most stable complex compound [MP PMT 1995] |
| A. | \[C{{u}^{++}}\] |
| B. | \[N{{i}^{++}}\] |
| C. | \[F{{e}^{++}}\] |
| D. | \[M{{n}^{++}}\] |
| Answer» B. \[N{{i}^{++}}\] | |
| 25. |
Which of the following weighs less when weighed in magnetic field |
| A. | \[VC{{l}_{3}}\] |
| B. | \[ScC{{l}_{3}}\] |
| C. | \[TiC{{l}_{3}}\] |
| D. | \[FeC{{l}_{3}}\] |
| Answer» C. \[TiC{{l}_{3}}\] | |
| 26. |
An elements is in \[{{M}^{3+}}\] form. Its electronic configuration is \[[Ar]3{{d}^{1}}\] the ion is [JIPMER 2002] |
| A. | \[T{{i}^{3+}}\] |
| B. | \[T{{i}^{4+}}\] |
| C. | \[C{{a}^{2+}}\] |
| D. | \[S{{c}^{+}}\] |
| Answer» B. \[T{{i}^{4+}}\] | |
| 27. |
Out of all the known elements, the percentage of transitional elements is approximately |
| A. | 0.3 |
| B. | 0.5 |
| C. | 0.6 |
| D. | 0.75 |
| Answer» D. 0.75 | |
| 28. |
Atomic number of Cr and Fe are 24 and 26 respectively. Which of the following is paramagnetic with the spin of electron [CBSE PMT 2002] |
| A. | \[{{[Cr{{(N{{H}_{3}})}_{6}}]}^{+3}}\] |
| B. | \[[Fe{{(CO)}_{5}}]\] |
| C. | \[{{[Fe{{(CN)}_{6}}]}^{-4}}\] |
| D. | \[[Cr{{(CO)}_{6}}]\] |
| Answer» B. \[[Fe{{(CO)}_{5}}]\] | |
| 29. |
Which of the following is/are soluble in ethanol [Roorkee Qualifying 1998] |
| A. | \[Hg{{F}_{2}}\] |
| B. | \[HgC{{l}_{2}}\] |
| C. | \[HgB{{r}_{2}}\] |
| D. | \[Hg{{I}_{2}}\] |
| Answer» B. \[HgC{{l}_{2}}\] | |
| 30. |
Collin's reagent is [RPMT 2002] |
| A. | \[MN{{O}_{2}}/HCl\] |
| B. | \[MN{{O}_{4}}/{{C}_{5}}{{H}_{5}}N\] |
| C. | \[{{K}_{2}}C{{r}_{2}}{{O}_{7}}/{{H}_{2}}S{{O}_{4}}\] |
| D. | \[C{{r}_{2}}{{O}_{3}}/2{{C}_{5}}{{H}_{5}}N\] |
| Answer» E. | |
| 31. |
Which of the following is used as white pigment |
| A. | \[Ti{{O}_{2}}\] |
| B. | \[{{V}_{2}}{{O}_{5}}\] |
| C. | \[CuO\] |
| D. | \[HgO\] |
| Answer» B. \[{{V}_{2}}{{O}_{5}}\] | |
| 32. |
\[Cu(CN)_{4}^{2-}\] is colourless as it absorbs light in |
| A. | Visible region |
| B. | Ultraviolet region |
| C. | Infrared region |
| D. | All above are wrong |
| Answer» E. | |
| 33. |
Which of the following exhibit maximum oxidation state of vanadium |
| A. | \[VOC{{l}_{3}}\] |
| B. | \[VC{{l}_{4}}\] |
| C. | \[VC{{l}_{3}}\] |
| D. | \[VC{{l}_{2}}\] |
| Answer» B. \[VC{{l}_{4}}\] | |
| 34. |
On adding KI to a solution of copper sulphate [CPMT 1973; NCERT 1977; MP PMT 1989] |
| A. | Cupric oxide is precipitated |
| B. | Metallic copper is precipitated |
| C. | Cuprous iodide is precipitated with liberation of iodine |
| D. | No change occurs |
| Answer» D. No change occurs | |
| 35. |
Which statement is not correct [MP PET 1999] |
| A. | Potassium permanganate is a powerful oxidising substance |
| B. | Potassium permanganate is a weaker oxidising substance than potassium dichromate |
| C. | Potassium permanganate is a stronger oxidising substance than potassium dichromate |
| D. | Potassium dichromate oxidises a secondary alcohol into a ketone |
| Answer» C. Potassium permanganate is a stronger oxidising substance than potassium dichromate | |
| 36. |
When \[KMn{{O}_{4}}\] is reduced with oxalic acid in acidic solution, the oxidation number of \[Mn\] changes from [CPMT 1989] |
| A. | 7 to 4 |
| B. | 6 to 4 |
| C. | 7 to 2 |
| D. | 4 to 2 |
| Answer» D. 4 to 2 | |
| 37. |
When zinc is added to \[CuS{{O}_{4}}\] copper gets ppt. due to [CPMT 1979] |
| A. | Reduction of copper ions |
| B. | Oxidation of copper ions |
| C. | Hydrolysis of copper sulphate |
| D. | Complex formation |
| Answer» B. Oxidation of copper ions | |
| 38. |
In the extraction of copper when molten copper is cooled slowly, blister copper is obtained due to evolution of the following gas |
| A. | Water vapour |
| B. | Sulphur dioxide |
| C. | Carbon dioxide |
| D. | Carbon monoxide |
| Answer» C. Carbon dioxide | |
| 39. |
In the smelting of roasted copper pyrites ore, melting occurs so that the first reaction is |
| A. | All the sulphur preferentially combines with iron to form \[FeS\] and \[CuO\] is formed |
| B. | All the sulphur preferentially combines with copper to form \[CuS\] and \[FeO\] is formed |
| C. | All the sulphur preferentially combines with iron to form \[FeS\] and \[C{{u}_{2}}O\] is formed |
| D. | All the sulphur preferentially combines with copper to form \[C{{u}_{2}}S\] and \[FeO\] is formed |
| Answer» B. All the sulphur preferentially combines with copper to form \[CuS\] and \[FeO\] is formed | |
| 40. |
Parke's process of desilverization of lead depends upon |
| A. | Partition coefficient of silver between molten zinc / molten lead having a high value |
| B. | Partition coefficient of silver between molten zinc/molten lead having a low value |
| C. | Crystallizing out of pure lead while the silver-lead eutectic which has a lower melting point is left behind in liquid form |
| D. | Chemical combination of zinc and silver which precipitates out easily |
| Answer» B. Partition coefficient of silver between molten zinc/molten lead having a low value | |
| 41. |
Extraction of silver from commercial lead is possible by [BHU 1979] |
| A. | Mond's process |
| B. | Park's process |
| C. | Haber's process |
| D. | Clark's process |
| Answer» C. Haber's process | |
| 42. |
The compound \[ZnF{{e}_{2}}{{O}_{4}}\]is [Kerala (Engg.) 2002] |
| A. | A normal spinel compound |
| B. | Interstitial compound |
| C. | Covalent compound |
| D. | Co-ordination compound |
| Answer» B. Interstitial compound | |
| 43. |
Which of the following is least soluble in water [NCERT 1974, 78; MNR 1984, 89] |
| A. | \[AgI\] |
| B. | \[AgCl\] |
| C. | \[AgBr\] |
| D. | \[A{{g}_{2}}S\] |
| Answer» E. | |
| 44. |
The nitrate of which metal left globule on heating strongly [JIPMER 2001] |
| A. | \[Pb{{(N{{O}_{3}})}_{2}}\] |
| B. | \[NaN{{O}_{3}}\] |
| C. | \[AgN{{O}_{3}}\] |
| D. | \[Cu{{(N{{O}_{3}})}_{2}}\] |
| Answer» D. \[Cu{{(N{{O}_{3}})}_{2}}\] | |
| 45. |
\[FeS{{O}_{4}}.{{(N{{H}_{4}})}_{2}}S{{O}_{4}}.6{{H}_{2}}O\] is called [Bihar CEE 1995] |
| A. | Mohr's salt |
| B. | Green salt |
| C. | Alum |
| D. | Glauber's salt |
| Answer» B. Green salt | |
| 46. |
Zinc when reacted with excess of \[NaOH\] gives [CPMT 1974, 78, 94; MP PMT 1999] |
| A. | Zinc hydroxide |
| B. | Zinc oxide |
| C. | Di sodium zincate |
| D. | Sodium zincate |
| Answer» E. | |
| 47. |
In acidic medium potassium dichromate acts as an oxidant according to the equation, \[C{{r}_{2}}O_{7}^{2-}+14{{H}^{+}}+6{{e}^{-}}\to 2C{{r}^{3+}}+7{{H}_{2}}O\]. What is the equivalent weight of \[{{K}_{2}}C{{r}_{2}}{{O}_{7}}\]? (mol. Wt. = M) [MP PET/PMT 1998] |
| A. | \[M\] |
| B. | \[M/2\] |
| C. | \[M/3\] |
| D. | \[M/6\] |
| Answer» E. | |
| 48. |
Silver nitrate is prepared by [CPMT 1984] |
| A. | The action of only conc. \[HN{{O}_{3}}\] on silver |
| B. | Heating silver oxide with \[N{{O}_{2}}\] |
| C. | The action of hot dil. \[HN{{O}_{3}}\] on silver |
| D. | Dissolve \[Ag\] in aqua-regia |
| Answer» D. Dissolve \[Ag\] in aqua-regia | |
| 49. |
A cuprous ore among the following is [KCET 2002] |
| A. | Cuprite |
| B. | Malachite |
| C. | Chalcopyrites |
| D. | Azurite |
| Answer» B. Malachite | |
| 50. |
Which of the following metals will not react with a solution of \[CuS{{O}_{4}}\] [CPMT 1996] |
| A. | \[Fe\] |
| B. | \[Zn\] |
| C. | \[Mg\] |
| D. | \[Hg\] |
| Answer» E. | |