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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.
| 11151. |
Group reagent for the precipitation of group II basic radicals for the qualitative analysis table is [MADT Bihar 1982] |
| A. | Dil. \[HCl+{{H}_{2}}S\] |
| B. | \[N{{H}_{4}}Cl\] (solid) + \[N{{H}_{4}}OH\] solution +\[{{H}_{2}}S\] |
| C. | \[{{\left( N{{H}_{4}} \right)}_{2}}C{{O}_{3}}\] solution |
| D. | None of these |
| Answer» B. \[N{{H}_{4}}Cl\] (solid) + \[N{{H}_{4}}OH\] solution +\[{{H}_{2}}S\] | |
| 11152. |
Which of the following compounds is brown coloured [AFMC 2001] |
| A. | \[Fe\left[ Fe{{\left( CN \right)}_{4}} \right]\] |
| B. | \[Fe\left[ Fe{{\left( CN \right)}_{6}} \right]\] |
| C. | \[F{{e}_{4}}\left[ Fe{{\left( CN \right)}_{6}} \right]\] |
| D. | \[{{K}_{2}}Fe\left[ Fe{{\left( CN \right)}_{6}} \right]\] |
| Answer» C. \[F{{e}_{4}}\left[ Fe{{\left( CN \right)}_{6}} \right]\] | |
| 11153. |
In the precipitation of the iron group in qualitative analysis, ammonium chloride is added before adding ammonium hydroxide to [AIIMS 1980; NCERT 1976; DPMT 1983; CPMT 1971, 73, 77,78, 80, 81, 83, 86; KCET 1999] |
| A. | Decrease concentration of \[O{{H}^{-}}\] ions |
| B. | Prevent interference by phosphate ions |
| C. | Increase concentration of \[C{{l}^{-}}\] ions |
| D. | Increase concentration of \[NH_{4}^{+}\] ions |
| Answer» B. Prevent interference by phosphate ions | |
| 11154. |
A precipitate of the following would be obtained when \[HCl\] is added to a solution of stannous sulphide \[(SnS)\] in yellow ammonium sulphide [CPMT 1977; NCERT 1974] |
| A. | \[SnS\] |
| B. | \[Sn{{S}_{2}}\] |
| C. | \[S{{n}_{2}}{{S}_{2}}\] |
| D. | \[{{(N{{H}_{4}})}_{2}}Sn{{S}_{3}}\] |
| Answer» C. \[S{{n}_{2}}{{S}_{2}}\] | |
| 11155. |
An aqueous solution contains the ions as \[Hg_{2}^{2+},\] \[H{{g}^{2+}},\] \[P{{b}^{2+}},\] and \[C{{d}^{2+}}\]. The addition of dilute \[HCl\left( 6N \right)\] precipitates [IIT 1995] |
| A. | \[H{{g}_{2}}C{{l}_{2}}\] only |
| B. | \[PbC{{l}_{2}}\] only |
| C. | \[PbC{{l}_{2}}\] and \[HgC{{l}_{2}}\] |
| D. | \[H{{g}_{2}}C{{l}_{2}}\] and \[PbC{{l}_{2}}\] |
| Answer» E. | |
| 11156. |
Mark the compound which turns black with \[N{{H}_{4}}OH\] [AFMC 1981; MP PMT 1995] |
| A. | Lead chloride |
| B. | Mercurous chloride |
| C. | Mercuric chloride |
| D. | Silver chloride |
| Answer» C. Mercuric chloride | |
| 11157. |
The aqueous solutions of the following salts will be coloured in the case of [IIT 1990] |
| A. | \[Zn{{(N{{O}_{3}})}_{2}}\] |
| B. | \[LiN{{O}_{3}}\] |
| C. | \[CrC{{l}_{3}}\] |
| D. | Potash alum |
| Answer» D. Potash alum | |
| 11158. |
On addition of aqueous \[NaOH\] to a salt solution, a white gelatinous precipitate is formed, which dissolves in excess alkali. The salt solution contains [MP PMT 1994] |
| A. | Chromium ions |
| B. | Aluminium ions |
| C. | Barium ions |
| D. | Iron ions |
| Answer» C. Barium ions | |
| 11159. |
Which one of the following sulphides is only completely precipitated when the acidic solution is made dilute [MP PET 2000] |
| A. | \[HgS\] |
| B. | \[PbS\] |
| C. | \[CdS\] |
| D. | \[CuS\] |
| Answer» D. \[CuS\] | |
| 11160. |
Which of the following give white precipitate when \[HCl\] is added to its aqueous solution |
| A. | \[H{{g}^{+}}\] |
| B. | \[M{{g}^{++}}\] |
| C. | \[Z{{n}^{++}}\] |
| D. | \[C{{d}^{++}}\] |
| Answer» B. \[M{{g}^{++}}\] | |
| 11161. |
A metal nitrate reacts with KI to give a black precipitate which on addition of excess of KI convert into orange colour solution. The cation of the metal nitrate is [IIT-JEE (Screening) 2005] |
| A. | \[H{{g}^{2+}}\] |
| B. | \[B{{i}^{3+}}\] |
| C. | \[P{{b}^{2+}}\] |
| D. | \[C{{u}^{+}}\] |
| Answer» C. \[P{{b}^{2+}}\] | |
| 11162. |
The alkaline earth metal that imparts apple green colour to the bunsen flame when introduced in it in the form of its chloride is [EAMCET 1979] |
| A. | Barium |
| B. | Strontium |
| C. | Calcium |
| D. | Magnesium |
| Answer» B. Strontium | |
| 11163. |
Sodium sulphite on heating with dilute \[HCl\] liberates a gas which [NCERT 1972] |
| A. | Turns lead acetate paper black |
| B. | Turns acidified potassium dichromate paper green |
| C. | Burns with a blue flame |
| D. | Smells like vinegar |
| Answer» C. Burns with a blue flame | |
| 11164. |
Which BLUE LIQUID is obtained on reacting equimolar amounts of two gases at\[-30{}^\circ C\]? [IIT 2005] |
| A. | \[{{N}_{2}}O\] |
| B. | \[{{N}_{2}}{{O}_{3}}\] |
| C. | \[{{N}_{2}}{{O}_{4}}\] |
| D. | \[{{N}_{2}}{{O}_{5}}\] |
| Answer» C. \[{{N}_{2}}{{O}_{4}}\] | |
| 11165. |
White precipitate of AgCl turns to greyish or black when |
| A. | reacts with \[N{{a}_{3}}As{{O}_{4}}\] |
| B. | exposed to sunlight |
| C. | reacts with \[{{K}_{2}}Cr{{O}_{4}}\] |
| D. | reacts with concentrated HCl |
| Answer» C. reacts with \[{{K}_{2}}Cr{{O}_{4}}\] | |
| 11166. |
Ammonia forms the complex \[Cu{{(N{{H}_{4}})}_{4}}^{2+}\] with copper ion in alkaline solution, but not in acidic solution. This is because of which of the following? |
| A. | In alkaline solution, insoluble \[Cu{{(OH)}_{2}}\] is precipitated, which is soluble in excess of any alkali |
| B. | \[Cu{{(OH)}_{2}}\] is amphoteric. |
| C. | In an acidic solution, hydration protects\[C{{u}^{2+}}\] ion. |
| D. | In acidic solution, proton coordinates with \[N{{H}_{3}}\] forming \[N{{H}_{4}}^{+}\] is not available. |
| Answer» E. | |
| 11167. |
Heating an ammoniacal solution of \[MgS{{O}_{4}}\] in the presence of \[N{{H}_{4}}Cl\] and \[N{{a}_{2}}HP{{O}_{4}}\] causes the precipitation of |
| A. | \[Mg(HP{{O}_{4}})S\] |
| B. | \[Mg(N{{H}_{4}})P{{O}_{4}}\] |
| C. | \[MgC{{l}_{2}}\] |
| D. | \[Mg{{(N{{H}_{4}})}_{4}}{{(P{{O}_{4}})}_{2}}\] |
| Answer» C. \[MgC{{l}_{2}}\] | |
| 11168. |
Nitrates form a brown ring when treated with \[HCl/FeS{{O}_{4}}\] followed by a few drops of cone. \[{{H}_{2}}S{{O}_{4}}\]. This test depends upon |
| A. | the reduction of nitrate to nitric oxide |
| B. | the oxidation of nitric oxide to nitrogen dioxide |
| C. | reduction of ferrous sulphate to iron |
| D. | oxidizing action of sulphuric acid |
| Answer» B. the oxidation of nitric oxide to nitrogen dioxide | |
| 11169. |
Acetaldehyde and acetone can be distinguished by [AIIMS 1996; DCE 1999; Pb. CET 2000] |
| A. | Molisch test |
| B. | Bromoform test |
| C. | Solubility in water |
| D. | Tollen's test |
| Answer» E. | |
| 11170. |
Only an aldehyde having..... can undergo the aldol condensation [KCET 1998] |
| A. | At least one beta H atom |
| B. | At least one alpha H atom |
| C. | An aromatic ring |
| D. | No alpha H atom |
| Answer» C. An aromatic ring | |
| 11171. |
When two molecules of acetaldehyde condense in the presence of dilute alkali, it forms [Bihar MEE 1996] |
| A. | Acetal |
| B. | Sodium formate |
| C. | Aldol |
| D. | Mesitylene |
| Answer» D. Mesitylene | |
| 11172. |
Bakelite is a polymer of [DPMT 1996; MP PET 2002] |
| A. | \[HCHO+\]phenol |
| B. | \[HCHO+\]aldehyde (acetaldehyde) |
| C. | Phenol\[+{{H}_{2}}S{{O}_{4}}\] |
| D. | \[HCHO+\]acetone |
| Answer» B. \[HCHO+\]aldehyde (acetaldehyde) | |
| 11173. |
A mixture of benzaldehyde and formaldehyde on heating with aqueous \[NaOH\] solution gives [IIT-JEE (Screening) 2001] |
| A. | Benzyl alcohol and sodium formate |
| B. | Sodium benzoate and methyl alcohol |
| C. | Sodium benzoate and sodium formate |
| D. | Benzyl alcohol and methyl alcohol |
| Answer» B. Sodium benzoate and methyl alcohol | |
| 11174. |
\[C{{H}_{3}}CH=CHCHO\] is oxidised to \[C{{H}_{3}}CH=CHCOOH\] using [NCERT 1978] |
| A. | Alkaline \[KMn{{O}_{4}}\] |
| B. | Selenium dioxide |
| C. | Ammoniacal \[AgN{{O}_{3}}\] |
| D. | All of these |
| Answer» D. All of these | |
| 11175. |
Acetaldehyde reacts with [CBSE PMT 1991] |
| A. | Electrophiles only |
| B. | Nucleophiles only |
| C. | Free radicals only |
| D. | Both electrophiles and nucleophiles |
| Answer» C. Free radicals only | |
| 11176. |
Aromatic aldehydes undergo disproportionation in presence of sodium or potassium hydroxide to give corresponding alcohol and acid. The reaction is known as [MNR 1987] |
| A. | Wurtz's reaction |
| B. | Cannizzaro reaction |
| C. | Friedel-Craft's reaction |
| D. | Claisen reaction |
| Answer» C. Friedel-Craft's reaction | |
| 11177. |
Benzaldehyde \[+NaOH\to \] [CPMT 1997, 2001; CBSE PMT 1999; Pb. PMT 1999] |
| A. | Benzyl alcohol |
| B. | Benzoic alcohol |
| C. | Hydrobenzamide |
| D. | Cinnamic acid |
| Answer» B. Benzoic alcohol | |
| 11178. |
Dimethyl ketones are usually characterised through [MNR 1992] |
| A. | Tollen's reagent |
| B. | Iodoform test |
| C. | Schiff's test |
| D. | Benedict's reagent |
| Answer» C. Schiff's test | |
| 11179. |
Which of the following will undergo aldol condensation [IIT 1998] |
| A. | Acetaldehyde |
| B. | Propanaldehyde |
| C. | Benzaldehyde |
| D. | Trideuteroacetaldehyde |
| Answer» B. Propanaldehyde | |
| 11180. |
Ketones react with Mg-Hg over water gives [AFMC 2005] |
| A. | Pinacolone |
| B. | Pinacols |
| C. | Alcohols |
| D. | None of these |
| Answer» C. Alcohols | |
| 11181. |
Formalin is an aqueous solution of [BHU 1979; DPMT 1983] |
| A. | Formic acid |
| B. | Formaldehyde |
| C. | Fluorescein |
| D. | Furfur aldehyde |
| Answer» C. Fluorescein | |
| 11182. |
Silver mirror test can be used to distinguish between [MP PET 2004] |
| A. | Ketone and acid |
| B. | Phenol and acid |
| C. | Aldehyde and acid |
| D. | Alcohol and phenol |
| Answer» D. Alcohol and phenol | |
| 11183. |
Which of the following react with \[NaHS{{O}_{3}}\] [Pb. CET 2003] |
| A. | \[C{{H}_{3}}COC{{H}_{3}}\] |
| B. | \[C{{H}_{3}}CHO\] |
| C. | \[HCHO\] |
| D. | All of these |
| Answer» E. | |
| 11184. |
Aldehydes and ketones can be reduced to corresponding hydrocarbons by [Kerala PMT 2004] |
| A. | Refluxing with water |
| B. | Refluxing with strong acids |
| C. | Refluxing with soda amalgam and water |
| D. | Refluxing with zinc amalgam and concentrated HCl |
| Answer» E. | |
| 11185. |
Acetaldehyde reacts with \[C{{l}_{2}}\] (in excess) to give [MP PMT 1997] |
| A. | Chloral |
| B. | Chloroform |
| C. | Acetic acid |
| D. | Trichloroacetic acid |
| Answer» B. Chloroform | |
| 11186. |
Which does not react with Fehling solution [MNR 1983, 93] |
| A. | Acetaldehyde |
| B. | Benzaldehyde |
| C. | Glucose |
| D. | Formic acid |
| Answer» C. Glucose | |
| 11187. |
Schiff's reagent is [MP PMT 1989] |
| A. | Magenta colour solution decolourised with sulphurous acid |
| B. | Ammoniacal cobalt chloride solution |
| C. | Ammoniacal manganese sulphate solution |
| D. | Magenta solution decolourised with chlorine |
| Answer» B. Ammoniacal cobalt chloride solution | |
| 11188. |
In the presence of a dilute base \[{{C}_{6}}{{H}_{5}}CHO\] and \[C{{H}_{3}}CHO\] react together to give a product. The product is [MP PET 1994] |
| A. | \[{{C}_{6}}{{H}_{5}}C{{H}_{3}}\] |
| B. | \[{{C}_{6}}{{H}_{5}}C{{H}_{2}}C{{H}_{2}}OH\] |
| C. | \[{{C}_{6}}{{H}_{5}}C{{H}_{2}}OH\] |
| D. | \[{{C}_{6}}{{H}_{5}}CH=CHCHO\] |
| Answer» E. | |
| 11189. |
An aldehyde on oxidation gives [CPMT 1973, 03; DPMT 1983; Manipal MEE 1995] |
| A. | An alcohol |
| B. | An acid |
| C. | A ketone |
| D. | An ether |
| Answer» C. A ketone | |
| 11190. |
\[C{{H}_{3}}COCl\underset{Pd/BaS{{O}_{4}}}{\mathop{\xrightarrow{2H}}}\,C{{H}_{3}}CHO+HCl;\] The above reaction is called [JIPMER 1997] |
| A. | Reimer-Tiemann reaction |
| B. | Cannizzaro reaction |
| C. | Rosenmund reaction |
| D. | Reformatsky reaction |
| Answer» D. Reformatsky reaction | |
| 11191. |
Compound which gives acetone on ozonolysis [UPSEAT 2003] |
| A. | \[C{{H}_{3}}-CH=CH-C{{H}_{3}}\] |
| B. | \[{{(C{{H}_{3}})}_{2}}C=C{{(C{{H}_{3}})}_{2}}\] |
| C. | \[{{C}_{6}}{{H}_{5}}CH=C{{H}_{2}}\] |
| D. | \[C{{H}_{3}}CH=C{{H}_{2}}\] |
| Answer» C. \[{{C}_{6}}{{H}_{5}}CH=C{{H}_{2}}\] | |
| 11192. |
\[R-CH=C{{H}_{2}}+CO+{{H}_{2}}\] \[\underset{\text{High Pressure}}{\mathop{\xrightarrow{\text{High Temp}}}}\,RC{{H}_{2}}C{{H}_{2}}CHO.\] [DPMT 2004] The above reaction is |
| A. | Mendius reaction |
| B. | Oxo process |
| C. | Sandorn's reaction |
| D. | Stephen's reaction |
| Answer» C. Sandorn's reaction | |
| 11193. |
Hydrolysis of ozonide of 1-butene gives [Kerala PMT 2003] |
| A. | Ethylene only |
| B. | Acetaldehyde and Formaldehyde |
| C. | Propionaldehyde and Formaldehyde |
| D. | Acetaldehyde only |
| Answer» D. Acetaldehyde only | |
| 11194. |
Propyne on hydrolysis in presence of HCl and \[HgS{{O}_{4}}\] gives [DPMT 1980; CPMT 1983] |
| A. | Acetaldehyde |
| B. | Acetone |
| C. | Formaldehyde |
| D. | None of these |
| Answer» C. Formaldehyde | |
| 11195. |
Catalyst used in Rosenmund reduction is [Bihar MEE 1997] |
| A. | Pd / \[BaS{{O}_{4}}\] |
| B. | Zn-Hg couple |
| C. | \[LiAl{{H}_{4}}\] |
| D. | \[Ni/{{H}_{2}}\] |
| Answer» E. | |
| 11196. |
Arrange the following in the increasing order of reactivity with \[N{{H}_{3}}\]: (I) \[C{{H}_{2}}O\] (II) \[C{{H}_{3}}CHO\] (III) \[C{{H}_{3}}-CO-C{{H}_{3}}\] (IV) |
| A. | I<II<III<IV |
| B. | III<IV<I<II |
| C. | IV<III<II<I |
| D. | II<I<IV<III |
| Answer» D. II<I<IV<III | |
| 11197. |
Which ester given below can most easily be produced by acid catalysed esterification (Fischer's esterification)? |
| A. | \[C{{H}_{3}}C{{H}_{2}}COO{{C}_{6}}{{H}_{5}}\] |
| B. | \[C{{H}_{3}}C{{H}_{2}}COOCH(C{{H}_{3}})C{{H}_{2}}C{{H}_{3}}\] |
| C. | \[C{{H}_{3}}C{{H}_{2}}COOC{{(C{{H}_{3}})}_{2}}C{{H}_{2}}C{{H}_{3}}\] |
| D. | \[C{{H}_{3}}C{{H}_{2}}COO{{C}_{2}}{{H}_{5}}\] |
| Answer» E. | |
| 11198. |
In cold countries ethylene glycol is added to water in the radiators to [CPMT 1971; NCERT 1971; MP PMT 1993] |
| A. | Bring down the specific heat of water |
| B. | Lower the viscosity |
| C. | Reduce the viscosity |
| D. | Make water a better lubricant |
| Answer» B. Lower the viscosity | |
| 11199. |
Ether can be used [CPMT 1982] |
| A. | As a general anaesthetic |
| B. | As a refrigerant |
| C. | In perfumery |
| D. | All of these |
| Answer» E. | |
| 11200. |
Wine (alcoholic beverages) contains [CPMT 1972, 77; BHU 1996; AFMC 2001] |
| A. | \[C{{H}_{3}}OH\] |
| B. | Glycerol |
| C. | \[{{C}_{2}}{{H}_{5}}OH\] |
| D. | 2-propanol |
| Answer» D. 2-propanol | |