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. |
Benzoic acid is less acidic than salicylic acid because of [Bihar MEE 1997] |
| A. | Hydrogen bond |
| B. | Inductive effect |
| C. | Resonance |
| D. | All of these |
| Answer» B. Inductive effect | |
| 2. |
\[C{{H}_{3}}CON{{H}_{2}}\xrightarrow{NaN{{O}_{2}}/HCl}X\] [Pb. CET 2003] |
| A. | \[C{{H}_{3}}COOH\] |
| B. | \[C{{H}_{3}}CO\overset{+}{\mathop{N}}\,{{H}_{3}}C{{l}^{-}}\] |
| C. | \[C{{H}_{3}}N{{H}_{2}}\] |
| D. | \[C{{H}_{3}}CHO\] |
| Answer» B. \[C{{H}_{3}}CO\overset{+}{\mathop{N}}\,{{H}_{3}}C{{l}^{-}}\] | |
| 3. |
Tischancko reaction is used for preparation of |
| A. | Ether |
| B. | Ester |
| C. | Amide |
| D. | Acid anhydride |
| Answer» C. Amide | |
| 4. |
Heating a mixture of ethyl alcohol and acetic acid in presence of conc. \[{{H}_{2}}S{{O}_{4}}\] produces a fruity smelling compound. This reaction is called [AIIMS 1996] |
| A. | Neutralisation |
| B. | Ester hydrolysis |
| C. | Esterification |
| D. | Williamson's synthesis |
| Answer» D. Williamson's synthesis | |
| 5. |
The reaction \[C{{H}_{3}}CH=C{{H}_{3}}\underset{{{H}^{+}}}{\mathop{\xrightarrow{CO+{{H}_{2}}O}}}\,C{{H}_{3}}-\underset{COOH\,\,\,\,\,\,\,}{\mathop{\underset{|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}{\mathop{CH-C{{H}_{3}}}}\,}}\,\] is known as [MP PMT 2002] |
| A. | Wurtz reactions |
| B. | Koch reaction |
| C. | Clemenson's reduction |
| D. | Kolbe's reaction |
| Answer» C. Clemenson's reduction | |
| 6. |
When formic acid reacts with \[PC{{l}_{5}}\] it forms [MNR 1982] |
| A. | Formyl chloride |
| B. | Acetyl chloride |
| C. | Methyl chloride |
| D. | Propionyl chloride |
| Answer» B. Acetyl chloride | |
| 7. |
Formic acid is obtained when [NCERT 1974] |
| A. | Calcium acetate is heated with conc. \[{{H}_{2}}S{{O}_{4}}\] |
| B. | Calcium formate is heated with calcium acetate |
| C. | Glycerol is heated with oxalic acid at \[{{110}^{o}}C\] |
| D. | Acetaldehyde is oxidised with \[{{K}_{2}}C{{r}_{2}}{{O}_{7}}\] and \[{{H}_{2}}S{{O}_{4}}\] |
| Answer» D. Acetaldehyde is oxidised with \[{{K}_{2}}C{{r}_{2}}{{O}_{7}}\] and \[{{H}_{2}}S{{O}_{4}}\] | |
| 8. |
The general formula for monocarboxylic acids is [CPMT 2003] |
| A. | \[{{C}_{n}}{{H}_{n}}COOH\] |
| B. | \[{{C}_{n}}{{H}_{2n+1}}COOH\] |
| C. | \[{{C}_{n}}{{H}_{2n-1}}COOH\] |
| D. | \[{{C}_{n}}{{H}_{2n}}{{O}_{2}}\] |
| Answer» C. \[{{C}_{n}}{{H}_{2n-1}}COOH\] | |
| 9. |
Which of the following pentoses will be optically active \[\begin{matrix} CHO \\ | \\ HCOH \\ | \\ HOCH \\ | \\ HCOH \\ | \\ C{{H}_{2}}OH \\ I \\ \end{matrix}\] \[\begin{matrix} CHO \\ | \\ HCOH \\ | \\ HCOH \\ | \\ HOCH \\ | \\ C{{H}_{2}}OH \\ II \\ \end{matrix}\] \[\begin{matrix} CHO \\ | \\ HCOH \\ | \\ HCOH \\ | \\ HCOH \\ | \\ C{{H}_{2}}OH \\ III \\ \end{matrix}\] [MP PET 1994] |
| A. | All |
| B. | II and III |
| C. | I |
| D. | II |
| Answer» B. II and III | |
| 10. |
Which of the following is not present in nucleic acids [MP PMT 1999] |
| A. | Uracil |
| B. | 2-aminopyridine |
| C. | Thymine |
| D. | Adenine |
| Answer» C. Thymine | |
| 11. |
In DNA, the complementary bases are [CBSE PMT 1998] |
| A. | Uracil and adenine; cytosine and guanine |
| B. | Adenine and thymine; guanine and cytosine |
| C. | Adenine and thymine; guanine and uracil |
| D. | Adenine and guanine; thymine and cytosine |
| Answer» C. Adenine and thymine; guanine and uracil | |
| 12. |
A gene is a segment of a molecule of [AIIMS 1999] |
| A. | DNA |
| B. | m-RNA |
| C. | t-RNA |
| D. | Protein |
| Answer» B. m-RNA | |
| 13. |
The base present in DNA, but not in RNA is [KCET (Engg.) 2001; NCERT 1978; Manipal MEE 1985; MP PMT 1994, MP PET 1995; DCE 2004] |
| A. | Guanine |
| B. | Adenine |
| C. | Uracil |
| D. | Thymine |
| Answer» E. | |
| 14. |
The first harmone chemically synthesised in the laboratory is [BHU 2002] |
| A. | Cortisone |
| B. | Insuline |
| C. | Adrenaline |
| D. | Estrone |
| Answer» C. Adrenaline | |
| 15. |
Which do the following vitamins has isoprene units in its structure [JIPMER 2002] |
| A. | Vitamin A |
| B. | Vitamin C |
| C. | Vitamin \[{{B}_{2}}\] |
| D. | Vitamin D |
| Answer» B. Vitamin C | |
| 16. |
A nucleoside on hydrolysis gives [KCET 2004] |
| A. | A heterocyclic base and orthophosphoric acid |
| B. | An aldopentose, a heterocyclic base and orthophosphoric acid |
| C. | An aldopentose and a heterocyclic base |
| D. | An aldopentose and orthophosphoric acid |
| Answer» D. An aldopentose and orthophosphoric acid | |
| 17. |
The process by which synthesis of protein takes place based on the genetic information present in m-RNA is called [KCET 2003; Kerala CET 2005] |
| A. | Translation |
| B. | Transcription |
| C. | Replication |
| D. | Messenger hypothesis |
| Answer» B. Transcription | |
| 18. |
Which of the following tests is not used for testing proteins [Kerala PMT 1999; KCET 1999] |
| A. | Millon's test |
| B. | Molisch's test |
| C. | Biuret test |
| D. | Ninhydrin test |
| Answer» C. Biuret test | |
| 19. |
The functional group which is found in amino acid is [AFMC 1998; AIEEE 2002] |
| A. | \[-COOH\] group |
| B. | \[-N{{H}_{2}}\] group |
| C. | \[-C{{H}_{3}}\] group |
| D. | Both A and B |
| Answer» E. | |
| 20. |
Read the following statements carefully Albumin is a simple protein The amino acid alanine contains an acidic side chain Insulin is a hormone Muscles contain the protein keratin Point out the wrong statements in the above set of statements |
| A. | A, B |
| B. | C, D |
| C. | A, C |
| D. | B, D |
| Answer» E. | |
| 21. |
Proteins are composed of [MP PMT 1995; J & K 2005] |
| A. | \[\alpha -\]amino acids |
| B. | Carbohydrates |
| C. | Vitamins |
| D. | Mineral salts |
| Answer» B. Carbohydrates | |
| 22. |
Which of the following reacts with haemoglobin in the blood to form carboxyhaemoglobin [Manipal MEE 1995] |
| A. | CO |
| B. | \[C{{O}_{2}}\] |
| C. | HCOOH |
| D. | \[{{H}_{2}}C{{O}_{3}}\] |
| Answer» B. \[C{{O}_{2}}\] | |
| 23. |
Out of the following the best category of proteins is [SCRA 1991] |
| A. | Polyamides |
| B. | Polythioethers |
| C. | Glycerides |
| D. | Polysaccharides |
| Answer» B. Polythioethers | |
| 24. |
The enzyme ptylin used for the digestion of food is present in [CPMT 1981; Pb. PMT 2004] |
| A. | Saliva |
| B. | Blood |
| C. | Intestines |
| D. | Adrenal glands |
| Answer» B. Blood | |
| 25. |
Natural silk is a |
| A. | Polyester |
| B. | Polyamide |
| C. | Polyacid |
| D. | Polysaccharide |
| Answer» C. Polyacid | |
| 26. |
Pepsin enzyme hydrolyses [NCERT 1984; MP PET 1999; MP PMT 2001] |
| A. | Proteins to amino acids |
| B. | Fats to fatty acids |
| C. | Glucose to ethyl alcohol |
| D. | Polysaccharides to monosaccharides |
| Answer» B. Fats to fatty acids | |
| 27. |
Proteins are hydrolysed by enzymes into [CPMT 1981; BHU 1987; MP PMT 1994, 2002] |
| A. | Dicarboxylic acids |
| B. | Hydroxy acids |
| C. | Amino acids |
| D. | Aromatic acids |
| Answer» D. Aromatic acids | |
| 28. |
Consider the following statements about haemoglobin. (1) It has four separate peptide subunits: Two identical \[\alpha \]-chains and two identical \[\beta \]-chains each bonded to haeme. (2) In CO poisoning, since much of the haemoglobin is ied up with CO, \[{{O}_{2}}\] transport to the tissues is inhibited. (3) Normal haemoglobin found in red blood cells has a glutamic acid residue. The correct statements are |
| A. | I and II |
| B. | II and III |
| C. | I and III |
| D. | All of these |
| Answer» E. | |
| 29. |
Which two of the following compounds are reduced to the same chiral alditol by sodium borohydride? I. II. III. IV. |
| A. | II and III |
| B. | I and II |
| C. | III and IV |
| D. | II and IV |
| Answer» C. III and IV | |
| 30. |
15 ml of 0.2 N alkali is required to complete neutralization of 30 ml acid solution. Concentration of the acid solution is [NCERT 1985; CPMT 1986] |
| A. | 0.1 N |
| B. | 0.3 N |
| C. | 0.15 N |
| D. | 0.4 N |
| Answer» B. 0.3 N | |
| 31. |
0.45 g of an acid (mol wt. = 90) required 20 ml of 0.5 N \[KOH\] for complete neutralization. Basicity of acid is [CPMT 1979] |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» C. 3 | |
| 32. |
The equivalent weight of an acid is equal to [AIIMS 1998] |
| A. | Molecular weight ´ acidity |
| B. | Molecular weight ´ basicity |
| C. | Molecular weight / basicity |
| D. | Molecular weight / acidity |
| Answer» D. Molecular weight / acidity | |
| 33. |
The simplest formula of a compound containing 50% of element X (at. wt. 10) and 50% of element Y (at. wt =20) is [DPMT 2000] |
| A. | \[{{X}_{2}}{{Y}_{3}}\] |
| B. | \[X{{Y}_{2}}\] |
| C. | \[{{X}_{2}}Y\] |
| D. | \[XY\] |
| Answer» D. \[XY\] | |
| 34. |
The maximum amount of \[BaS{{O}_{4}}\] precipitated on mixing \[BaC{{l}_{2}}\] (0.5M) with \[{{H}_{2}}S{{O}_{4}}\] (1M) will correspond to [AIIMS 1997] |
| A. | 0.5 M |
| B. | 1.0 M |
| C. | 1.5 M |
| D. | 2.0 M |
| Answer» B. 1.0 M | |
| 35. |
A 100 ml solution of 0.1 \[N-HCl\] was titrated with 0.2 \[N-NaOH\] solution. The titration was discontinued after adding 30 ml of \[NaOH\] solution. The remaining titration was completed by adding 0.25 \[N-KOH\] solution. The volume of \[KOH\] required for completing the titration is [MP PMT 1997] |
| A. | 16 ml |
| B. | 32 ml |
| C. | 35 ml |
| D. | 70 ml |
| Answer» B. 32 ml | |
| 36. |
100 \[c{{m}^{3}}\] of 0.1 N \[HCl\] solution is mixed with 100 \[c{{m}^{3}}\] of 0.2 N \[NaOH\] solution. The resulting solution is [MP PET 1996] |
| A. | 0.1 N and the solution is basic |
| B. | 0.05 N and the solution is basic |
| C. | 0.1 N and the solution is acidic |
| D. | 0.05 N and the solution is acidic |
| Answer» C. 0.1 N and the solution is acidic | |
| 37. |
0.1914g of an organic acid is dissolved in approx. 20 ml of water. 25 ml of 0.12 N NaOH required for the complete neutralization of the acid solution. The equivalent weight of the acid is [MP PET 2000] |
| A. | 65 |
| B. | 64 |
| C. | 63.8 |
| D. | 62.5 |
| Answer» D. 62.5 | |
| 38. |
1 gm of hydrogen is found to combine with 80 gms of bromine. 1 gm of calcium (valency 2) combines with 4 gms of bromine. The equivalent weight of calcium is [NCERT 1982] |
| A. | 10 |
| B. | 20 |
| C. | 40 |
| D. | 80 |
| Answer» C. 40 | |
| 39. |
The indicator used in titrating weak acid (e.g. oxalic acid) with a strong base (e.g. caustic soda) solution is [IIT-JEE 1985; CPMT 1990; MNR 1980; NCERT 1973, 77; MP PMT 1994] |
| A. | Methyl orange |
| B. | Methyl red |
| C. | Fluorescein |
| D. | Phenolphthalein |
| Answer» E. | |
| 40. |
If we use phenolphthalein as an indicator in a titration of \[N{{a}_{2}}C{{O}_{3}}\] with \[HCl,\] the usual result is [CBSE PMT 1989] |
| A. | No visible change will occur |
| B. | The indicator reacts with the acid |
| C. | The indicator reacts with the base |
| D. | Sodium chloride and carbonic acid will be formed |
| Answer» B. The indicator reacts with the acid | |
| 41. |
10 ml of conc. \[{{H}_{2}}S{{O}_{4}}\] (18 molar) is diluted to 1 litre. The approximate strength of dilute acid could be [CPMT 1971] |
| A. | 0.18 N |
| B. | 0.36 N |
| C. | 0.09 N |
| D. | 18.00 N |
| Answer» C. 0.09 N | |
| 42. |
When a standard solution of NaOH is left in the air for a few hours, [Kerala PMT 2004] |
| A. | A precipitate will form. |
| B. | Strength will decrease. |
| C. | The concentration of \[N{{a}^{+}}\] ions will decrease. |
| D. | All are wrong. |
| Answer» C. The concentration of \[N{{a}^{+}}\] ions will decrease. | |
| 43. |
The volume of 0.6 M NaOH required to neutralise\[30c{{m}^{3}}\] of 0.4 M HCl is [Pb. CET 2001] |
| A. | 40 \[c{{m}^{3}}\] |
| B. | 30 \[c{{m}^{3}}\] |
| C. | 20 \[c{{m}^{3}}\] |
| D. | 10 \[c{{m}^{3}}\] |
| Answer» D. 10 \[c{{m}^{3}}\] | |
| 44. |
The primary standard solution for estimation of \[N{{a}_{2}}{{S}_{2}}{{O}_{3}}\] is [Orissa JEE 2005] |
| A. | \[{{I}_{2}}\] solution |
| B. | \[KMn{{O}_{4}}\] |
| C. | \[{{K}_{2}}C{{r}_{2}}{{O}_{7}}\] |
| D. | Oxalic acid |
| Answer» B. \[KMn{{O}_{4}}\] | |
| 45. |
Which of the following precipitate does not dissolve even in large excess of \[N{{H}_{4}}OH\] [MP PMT 1991] |
| A. | \[AgCl\] |
| B. | \[AgBr\] |
| C. | \[AgI\] |
| D. | None of these |
| Answer» D. None of these | |
| 46. |
A mixture when heated with conc. \[{{H}_{2}}S{{O}_{4}}\] with \[Mn{{O}_{2}}\] brown fumes are formed due to |
| A. | \[B{{r}^{-}}\] |
| B. | \[NO_{3}^{-}\] |
| C. | \[C{{l}^{-}}\] |
| D. | \[{{I}^{-}}\] |
| Answer» B. \[NO_{3}^{-}\] | |
| 47. |
........ is formed when potassium iodide is heated with conc. \[{{H}_{2}}S{{O}_{4}}\] [CPMT 1971] |
| A. | \[HI\] |
| B. | \[{{I}_{2}}\] |
| C. | \[HI{{O}_{3}}\] |
| D. | \[KI{{O}_{3}}\] |
| Answer» C. \[HI{{O}_{3}}\] | |
| 48. |
Which of the following combines with \[Fe\] (II) ions to form a brown complex [AIIMS 1982, 87; AFMC 1988; CBSE PMT 2000; Pb. PMT 2000; MP PET 2000, 01] |
| A. | \[{{N}_{2}}O\] |
| B. | \[NO\] |
| C. | \[{{N}_{2}}{{O}_{3}}\] |
| D. | \[{{N}_{2}}{{O}_{5}}\] |
| Answer» C. \[{{N}_{2}}{{O}_{3}}\] | |
| 49. |
Which one of the following anions is not easily removed from aqueous solutions by precipitation [IIT 1995] |
| A. | \[C{{l}^{-}}\] |
| B. | \[NO_{3}^{-}\] |
| C. | \[CO_{3}^{-2}\] |
| D. | \[SO_{4}^{-2}\] |
| Answer» C. \[CO_{3}^{-2}\] | |
| 50. |
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 2005] |
| A. | \[H{{g}^{2+}}\] |
| B. | \[B{{i}^{3+}}\] |
| C. | \[P{{b}^{2+}}\] |
| D. | \[C{{u}^{+}}\] |
| Answer» C. \[P{{b}^{2+}}\] | |