MCQOPTIONS
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MCQOPTIONS
This section includes 140 Mcqs, each offering curated multiple-choice questions to sharpen your Chemistry knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
The most efficient agent for the absorption of \[S{{O}_{3}}\] is [KCET 1998] |
| A. | \[98%{{H}_{2}}S{{O}_{4}}\] |
| B. | \[80%{{H}_{2}}S{{O}_{4}}\] |
| C. | \[20%\]oleum |
| D. | \[90%{{H}_{2}}S{{O}_{4}}\] |
| Answer» B. \[80%{{H}_{2}}S{{O}_{4}}\] | |
| 2. |
Match List I with List II and select the correct answer using the codes given below the lists List I List IIList - IList - II(A)Peroxide(1)\[{{C}_{3}}{{O}_{2}}\](B)Superoxide(2)\[Pb{{O}_{2}}\](C)Dioxide(3)\[K{{O}_{2}}\](D)Suboxide(4)\[{{H}_{2}}{{O}_{2}}\]Codes: [NDA 1999] |
| A. | A-4 B-3 C-2 D-1 |
| B. | A-3 B-2 C-1 D-4 |
| C. | A-4 B-2 C-3 D-1 |
| D. | A-4 B-1 C-2 D-3 |
| Answer» B. A-3 B-2 C-1 D-4 | |
| 3. |
Concentrated hydrochloric acid when kept in open air sometimes produces a cloud of white fumes. The explanation for it is that [AIEEE 2003] |
| A. | Concentrated hydrochloric acid emits strongly smelling \[HCl\] gas all the time |
| B. | Oxygen in air reacts with the emitted \[HCl\] gas to form a cloud of chlorine gas |
| C. | Strong affinity of \[HCl\] gas for moisture in air results in forming of droplets of liquid solution which appears like a cloudy smoke |
| D. | Due to strong affinity for water, concentrated hydrochloric acid pulls moisture of air towards itself. This moisture forms droplets of water and hence the cloud |
| Answer» C. Strong affinity of \[HCl\] gas for moisture in air results in forming of droplets of liquid solution which appears like a cloudy smoke | |
| 4. |
Which of the following gas mixture is used by the divers inside the sea [AFMC 2004] |
| A. | \[{{O}_{2}}+He\] |
| B. | \[{{O}_{2}}+Xe\] |
| C. | \[{{O}_{2}}+Ar\] |
| D. | \[{{O}_{2}}+{{N}_{2}}\] |
| Answer» B. \[{{O}_{2}}+Xe\] | |
| 5. |
The colour of liquid \[{{O}_{2}}\] is [BVP 2004] |
| A. | Red |
| B. | Dark blue |
| C. | Pale yellow |
| D. | Pale blue |
| Answer» E. | |
| 6. |
Thermite is a mixture of [Pb. CET 2004] |
| A. | \[C{{r}_{2}}{{O}_{3}}+A{{l}_{2}}{{O}_{3}}\] |
| B. | \[F{{e}_{2}}{{O}_{3}}+Al\] |
| C. | \[F{{e}_{2}}{{O}_{3}}+A{{l}_{2}}{{O}_{3}}\] |
| D. | \[A{{l}_{2}}{{O}_{3}}+2Cr\] |
| Answer» C. \[F{{e}_{2}}{{O}_{3}}+A{{l}_{2}}{{O}_{3}}\] | |
| 7. |
The noble gas was first time discovered by |
| A. | Cavandish |
| B. | William Ramsay |
| C. | Rayleigh |
| D. | Frankland |
| Answer» C. Rayleigh | |
| 8. |
Nessler's reagent is [CPMT 2002] |
| A. | Potassium in mercuric iodide |
| B. | \[TiC{{l}_{4}}\] |
| C. | Anhydrous \[AlC{{l}_{3}}\] |
| D. | \[A{{l}_{2}}{{O}_{3}}/C{{r}_{2}}{{O}_{3}}\] |
| Answer» B. \[TiC{{l}_{4}}\] | |
| 9. |
Four reactions are given below (i)\[2Li+2{{H}_{2}}O\to 2LiOH+{{H}_{2}}\] (ii)\[2Na+2{{H}_{2}}O\to 2NaOH+{{H}_{2}}\] (iii)\[2LiN{{O}_{3}}\xrightarrow{Heat}2LiN{{O}_{2}}+{{O}_{2}}\] (iv)\[2NaN{{O}_{3}}\xrightarrow{Heat}2NaN{{O}_{2}}+{{O}_{2}}\] Which of the above, if any, is wrong |
| A. | (iv) |
| B. | (iii) |
| C. | (i) |
| D. | None of these |
| Answer» C. (i) | |
| 10. |
Increasing order of solubility is [AFMC 1987] |
| A. | \[CaC{{O}_{3}},KHC{{O}_{3}},NaHC{{O}_{3}}\] |
| B. | \[NaHC{{O}_{3}},KHC{{O}_{3}},CaC{{O}_{3}}\] |
| C. | \[KHC{{O}_{3}},NaHC{{O}_{3}},CaC{{O}_{3}}\] |
| D. | \[CaC{{O}_{3}},NaHC{{O}_{3}},KHC{{O}_{3}}\] |
| Answer» E. | |
| 11. |
When \[S{{O}_{2}}\] is passed through acidified solution of \[{{H}_{2}}S\] [CPMT 1973, 81, 93] |
| A. | \[{{H}_{2}}S{{O}_{4}}\] is formed |
| B. | \[{{H}_{2}}S{{O}_{3}}\] is formed |
| C. | Sulphur is precipitated |
| D. | None of these |
| Answer» D. None of these | |
| 12. |
The mixture of conc. HCl and potassium chlorate on heating gives [Roorkee 2000] |
| A. | \[C{{l}_{2}}\] only |
| B. | \[Cl{{O}_{2}}\]only |
| C. | \[C{{l}_{2}}+Cl{{O}_{2}}\] |
| D. | \[C{{l}_{2}}+Cl{{O}_{2}}+Cl{{O}_{3}}\] |
| Answer» D. \[C{{l}_{2}}+Cl{{O}_{2}}+Cl{{O}_{3}}\] | |
| 13. |
Lithium aluminium hydride acts as [CPMT 1994] |
| A. | Oxidising agent |
| B. | Reducing agent |
| C. | Both the above |
| D. | None of these |
| Answer» C. Both the above | |
| 14. |
Which one of the following is the true covalent oxide of iodine [MP PET/PMT 1988] |
| A. | \[{{I}_{2}}{{O}_{4}}\] |
| B. | \[{{I}_{2}}{{O}_{5}}\] |
| C. | \[{{I}_{2}}{{O}_{7}}\] |
| D. | \[{{I}_{2}}{{O}_{9}}\] |
| Answer» C. \[{{I}_{2}}{{O}_{7}}\] | |
| 15. |
\[BaS{{O}_{4}}\] and carbon on heating reacts to produce [Pb. PMT 2004] |
| A. | \[Ba+S{{O}_{2}}+C{{O}_{2}}\] |
| B. | \[BaS+CO\] |
| C. | \[BaS+{{O}_{2}}+S{{O}_{2}}\] |
| D. | \[BaC{{O}_{3}}+S+{{O}_{2}}\] |
| Answer» C. \[BaS+{{O}_{2}}+S{{O}_{2}}\] | |
| 16. |
Lead is maximum in [BVP 2004] |
| A. | Soda glass |
| B. | Jena glass |
| C. | Pyrex glass |
| D. | Flint glass |
| Answer» E. | |
| 17. |
The first ionisation energies of alkaline earth metals are higher than those of the alkali metals. This is because [UPSEAT 2001] |
| A. | There is increases in the nuclear charge of the alkaline earth metals |
| B. | There is decreases in the nuclear charge of the alkaline earth metals |
| C. | There is no change in the nuclear charge |
| D. | None of these |
| Answer» B. There is decreases in the nuclear charge of the alkaline earth metals | |
| 18. |
Red phosphorus is less reactive than yellow phosphorus because [DPMT 1982; JIPMER 1999;CBSE PMT 1999; RPET 2003] |
| A. | Its colour is red |
| B. | It is highly polymerized |
| C. | It is hard |
| D. | It is insoluble in \[{{C}_{2}}{{H}_{5}}OH\] |
| Answer» C. It is hard | |
| 19. |
Nitrogen is liberated by the thermal decomposition of only [IIT 1991] |
| A. | \[N{{H}_{4}}N{{O}_{2}}\] |
| B. | \[Na{{N}_{3}}\] |
| C. | \[{{(N{{H}_{4}})}_{2}}C{{r}_{2}}{{O}_{7}}\] |
| D. | All the three |
| Answer» E. | |
| 20. |
Which would quickly absorbs oxygen [CBSE PMT 1992; MP PET 1995] |
| A. | Alkaline solution of pyrogallol |
| B. | Conc. \[{{H}_{2}}S{{O}_{4}}\] |
| C. | Lime water |
| D. | Alkaline solution of \[CuS{{O}_{4}}\] |
| Answer» B. Conc. \[{{H}_{2}}S{{O}_{4}}\] | |
| 21. |
Which of the following is the life saving mixture for an asthma patient [MP PMT 2001] |
| A. | Mixture of helium and oxygen |
| B. | Mixture of neon and oxygen |
| C. | Mixture of xenon and nitrogen |
| D. | Mixture of argon and oxygen |
| Answer» B. Mixture of neon and oxygen | |
| 22. |
The compounds of alkaline earth metals have the following magnetic nature [MP PET/PMT 1998; RPMT 2000; JIPMER 2002] |
| A. | Diamagnetic |
| B. | Paramagnetic |
| C. | Ferromagnetic |
| D. | Diaferromagnetic |
| Answer» B. Paramagnetic | |
| 23. |
The number of electron and proton in the third alkaline earth metal ion will be [MP PET 2003] |
| A. | \[\frac{e}{20},\,\,\frac{p}{20}\] |
| B. | \[\frac{e}{18},\,\,\frac{p}{20}\] |
| C. | \[\frac{e}{18},\,\,\frac{p}{18}\] |
| D. | \[\frac{e}{19},\,\,\frac{p}{20}\] |
| Answer» E. | |
| 24. |
Solubility of iodine in water is greatly increased by the addition of iodide ions because of the formation of ...... [IIT 1994] |
| A. | \[{{I}_{2}}\] |
| B. | \[{{I}_{3}}\] |
| C. | \[{{I}_{3}}^{-}\] |
| D. | \[{{I}^{-}}\] |
| Answer» D. \[{{I}^{-}}\] | |
| 25. |
Which of the following statements is false for alkali metals [MNR 1994; MP PET 2001] |
| A. | Lithium is the strongest reducing agent |
| B. | \[Na\] is amphoteric in nature |
| C. | \[L{{i}^{+}}\] is exceptionally small |
| D. | All alkali metals give blue solution in liquid ammonia |
| Answer» C. \[L{{i}^{+}}\] is exceptionally small | |
| 26. |
The substance not likely to contain \[CaC{{O}_{3}}\] is [AIEEE 2003] |
| A. | A marble statue |
| B. | Calcined gypsum |
| C. | Sea shells |
| D. | Dolomite |
| Answer» C. Sea shells | |
| 27. |
Which group is called buffer group of the periodic table [Pb. CET 2004] |
| A. | I |
| B. | VII |
| C. | VIII |
| D. | Zero |
| Answer» E. | |
| 28. |
Which one of the following is not an amphoteric substance [KCET 2004] |
| A. | \[HN{{O}_{3}}\] |
| B. | \[HCO_{3}^{-}\] |
| C. | \[{{H}_{2}}O\] |
| D. | \[N{{H}_{3}}\] |
| Answer» B. \[HCO_{3}^{-}\] | |
| 29. |
What is the correct relationship between the pHs of isomolar solutions of sodium oxide \[(p{{H}_{1}}),\] sodium sulphide \[(p{{H}_{2}}),\] sodium selenide \[(p{{H}_{3}})\] and sodium telluride \[(p{{H}_{4}})\] [CBSE PMT 2005] |
| A. | \[p{{H}_{1}}>p{{H}_{2}}=p{{H}_{3}}>p{{H}_{4}}\] |
| B. | \[p{{H}_{1}}<p{{H}_{2}}<p{{H}_{3}}<p{{H}_{4}}\] |
| C. | \[p{{H}_{1}}<p{{H}_{2}}<p{{H}_{3}}=p{{H}_{4}}\] |
| D. | \[p{{H}_{1}}>p{{H}_{2}}>p{{H}_{3}}>p{{H}_{4}}\] |
| Answer» E. | |
| 30. |
As the alkaline earth metals (except Be) tend to lose their valence electrons readily they act as [Kerala (Med.) 2002] |
| A. | Weak oxidising agent |
| B. | Weak reducing agent |
| C. | Strong oxidising agent |
| D. | Strong reducing agent |
| Answer» E. | |
| 31. |
The correct sequence in decreasing order of the percentage of nitrogen in the given compounds is [NDA 1999] |
| A. | Urea > Ammonium chloride > Ammonium nitrate > Ammonium nitrite |
| B. | Urea > Ammonium nitrate > Ammonium nitrite > Ammonium chloride |
| C. | Urea > Ammonium nitrite > Ammonium nitrate > Ammonium chloride |
| D. | Urea > Ammonium nitrite > Ammonium chloride > Ammonium nitrate |
| Answer» D. Urea > Ammonium nitrite > Ammonium chloride > Ammonium nitrate | |
| 32. |
A certain metal M is used to prepare an antacid, which is used as a medicine in acidity. This metal accidently catches fire which can not be put out by using \[C{{O}_{2}}\] based extinguishers. The metal M is [BHU 2002] |
| A. | \[Ca\] |
| B. | C |
| C. | Mg |
| D. | All of these |
| Answer» D. All of these | |
| 33. |
The thermal stability of alkaline earth metal carbonates \[MgC{{O}_{3}},\,CaC{{O}_{3}},\]\[BaC{{O}_{3}}\] and \[SrC{{O}_{3}}\]decreases as [MP PMT 2002] |
| A. | \[CaC{{O}_{3}}>SrC{{O}_{3}}>MgC{{O}_{3}}>BaC{{O}_{3}}\] |
| B. | \[BaC{{O}_{3}}>SrC{{O}_{3}}>MgC{{O}_{3}}>CaC{{O}_{3}}\] |
| C. | \[BaC{{O}_{3}}>SrC{{O}_{3}}>CaC{{O}_{3}}>MgC{{O}_{3}}\] |
| D. | \[MgC{{O}_{3}}>CaC{{O}_{3}}>SrC{{O}_{3}}>BaC{{O}_{3}}\] |
| Answer» D. \[MgC{{O}_{3}}>CaC{{O}_{3}}>SrC{{O}_{3}}>BaC{{O}_{3}}\] | |
| 34. |
The element having atomic number 56 belongs to [AFMC 2002] |
| A. | Actinides |
| B. | Alkaline earth metals |
| C. | Transition series |
| D. | Lanthanides |
| Answer» C. Transition series | |
| 35. |
Which of the following statements is false [BHU 2005] |
| A. | CaOCl2 gives OH-, Cl- and OCl- in aqueous solution |
| B. | Diamond and graphite are allotrops of carbon |
| C. | Bleaching action of Cl2 in moist condition is not permanent |
| D. | Calomel is Hg2Cl2 |
| Answer» D. Calomel is Hg2Cl2 | |
| 36. |
Which of the following hydroxide is insoluble in water [AIIMS 2001] |
| A. | \[Be{{(OH)}_{2}}\] |
| B. | \[Mg{{(OH)}_{2}}\] |
| C. | \[Ca{{(OH)}_{2}}\] |
| D. | \[Ba{{(OH)}_{2}}\] |
| Answer» B. \[Mg{{(OH)}_{2}}\] | |
| 37. |
\[MgC{{l}_{2}}.6{{H}_{2}}O\] when heated gives [CPMT 1997] |
| A. | Magnesium oxychloride |
| B. | Magnesium dichloride |
| C. | Magnesium oxide |
| D. | Magnesium chloride |
| Answer» D. Magnesium chloride | |
| 38. |
Which one of the following is the strongest base [Pb. PMT 1998] |
| A. | \[Be{{\left( OH \right)}_{2}}\] |
| B. | \[Mg{{\left( OH \right)}_{2}}\] |
| C. | \[Al{{\left( OH \right)}_{3}}\] |
| D. | \[Si{{\left( OH \right)}_{4}}\] |
| Answer» C. \[Al{{\left( OH \right)}_{3}}\] | |
| 39. |
Which of the following alkaline-earth metal hydroxides is the strongest base [CPMT 1996] |
| A. | \[Be{{(OH)}_{2}}\] |
| B. | \[Mg{{(OH)}_{2}}\] |
| C. | \[Ca{{(OH)}_{2}}\] |
| D. | \[Ba{{(OH)}_{2}}\] |
| Answer» E. | |
| 40. |
Alkaline earth metals come under [Bihar MEE 1996] |
| A. | Halogens |
| B. | Representative elements |
| C. | Transition elements |
| D. | Inner transition elements |
| E. | None of these |
| Answer» C. Transition elements | |
| 41. |
The formula for calcium chlorite is [CBSE PMT 1994, 96] |
| A. | \[Ca{{\left( Cl{{O}_{4}} \right)}_{2}}\] |
| B. | \[Ca{{\left( Cl{{O}_{3}} \right)}_{2}}\] |
| C. | \[CaCl{{O}_{2}}\] |
| D. | \[Ca{{(Cl{{O}_{2}})}_{2}}\] |
| Answer» E. | |
| 42. |
A mixture of lime paste is sand, water and [RPMT 1997] |
| A. | Gypsum |
| B. | Slacked lime |
| C. | Quick lime |
| D. | Lime stone |
| Answer» D. Lime stone | |
| 43. |
In the Alkaline earth metals, the element forming predominantly covalent compound is [BHU 2001] |
| A. | \[Be\] |
| B. | \[Mg\] |
| C. | \[Sr\] |
| D. | \[Ca\] |
| Answer» B. \[Mg\] | |
| 44. |
Which of the following substances is used in the laboratory for fast drying of neutral gases [AIIMS 1998; AFMC 1999] |
| A. | Sodium phosphate |
| B. | Phosphorus pentoxide |
| C. | Sodium sulphate |
| D. | Anhydrous calcium chloride |
| Answer» E. | |
| 45. |
Alkaline earth metals are [MP PMT 1996] |
| A. | Li, Be, K, Mg, Ca |
| B. | Be, Mg, Ca, Sr, Ba |
| C. | Be, K, Mg, Ca, Sr |
| D. | Be, Mg, Ca, K, Rb |
| Answer» C. Be, K, Mg, Ca, Sr | |
| 46. |
Which of the following decreases on going gradually from \[Be\] to \[Ba\] (in periodic table) |
| A. | Basic character of hydroxides |
| B. | Solubility of sulphates in water |
| C. | Solubility of hydroxides in water |
| D. | Strength of elements as reducing agent |
| Answer» C. Solubility of hydroxides in water | |
| 47. |
Identify the correct statement [CBSE PMT 1995] |
| A. | Gypsum contains a lower percentage of plaster of calcium than plaster of paris |
| B. | Gypsum is obtained by heating plaster of paris |
| C. | Plaster of paris can be obtained by hydration of gypsum |
| D. | Plaster of paris is obtained by partial oxidation of gypsum |
| Answer» B. Gypsum is obtained by heating plaster of paris | |
| 48. |
Portland cement is manufactured by using [CPMT 1986] |
| A. | Lime stone, clay and sand |
| B. | Lime stone, gypsum and sand |
| C. | Lime stone, gypsum and alumina |
| D. | Lime stone, clay and gypsum |
| Answer» E. | |
| 49. |
A major constituent of portland cement except lime is [CPMT 1982] |
| A. | Silica |
| B. | Alumina |
| C. | Iron oxide |
| D. | Magnesia |
| Answer» B. Alumina | |
| 50. |
A substance absorbs \[C{{O}_{2}}\] and violently reacts with water. That substance is [AFMC 1988] |
| A. | \[CaC{{O}_{3}}\] |
| B. | \[CaO\] |
| C. | \[{{H}_{2}}S{{O}_{4}}\] |
| D. | \[ZnO\] |
| Answer» C. \[{{H}_{2}}S{{O}_{4}}\] | |