MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 1187 Mcqs, each offering curated multiple-choice questions to sharpen your NEET knowledge and support exam preparation. Choose a topic below to get started.
| 651. |
A mixture of two amino acids having pI 9.60 and 5.40 can be separated |
| A. | by adjusting the pH of the solution at 9.60 |
| B. | by adjusting the pH of the solution at 4.20 |
| C. | by adjusting the pH of the solution at 7.0 |
| D. | by adjusting the pH of the solution at 7.5. |
| Answer» B. by adjusting the pH of the solution at 4.20 | |
| 652. |
Assume that a particular amino acid has an isoelectric point of 6.0. In a solution at pH 1.0, which of the following species will predominate? |
| A. | \[{{H}_{3}}\overset{+}{\mathop{N}}\,\overset{R}{\mathop{\overset{|}{\mathop{C}}\,}}\,HC{{O}_{2}}H\] |
| B. | \[{{H}_{2}}\overset{{}}{\mathop{N}}\,\overset{R}{\mathop{\overset{|}{\mathop{C}}\,}}\,HC{{O}_{2}}H\] |
| C. | \[{{H}_{3}}\overset{+}{\mathop{N}}\,\overset{R}{\mathop{\overset{|}{\mathop{C}}\,}}\,HC{{O}_{2}}\] |
| D. | \[{{H}_{2}}\overset{{}}{\mathop{N}}\,\overset{R}{\mathop{\overset{|}{\mathop{C}}\,}}\,HCO_{2}^{-}\] |
| Answer» B. \[{{H}_{2}}\overset{{}}{\mathop{N}}\,\overset{R}{\mathop{\overset{|}{\mathop{C}}\,}}\,HC{{O}_{2}}H\] | |
| 653. |
Hydrolysis of sucrose is called |
| A. | hydration |
| B. | saponification |
| C. | esterification |
| D. | inversion |
| Answer» E. | |
| 654. |
Which of the following does not reduce Benedict's solution? |
| A. | Glucose |
| B. | Fructose |
| C. | Sucrose |
| D. | Aldehyde |
| Answer» D. Aldehyde | |
| 655. |
Glycosidic linkage is actually an: |
| A. | Carbonyl bond |
| B. | Ether bond |
| C. | Ester bond |
| D. | Amide bond |
| Answer» C. Ester bond | |
| 656. |
Amylopectin is a polymer of |
| A. | \[\alpha -D\]-glucose |
| B. | amino acid |
| C. | \[\beta -D\]- glucose |
| D. | amylase. |
| Answer» B. amino acid | |
| 657. |
Natural glucose is termed D-glucose because: |
| A. | \[-OH\] on the second carbon is on the right side in Fischer projection |
| B. | \[-OH\] on the sixth carbon is on the right side in Fischer projection. |
| C. | \[-OH\] on the fifth carbon is on the right side in Fischer projection. |
| D. | It is dextrorotatory. |
| Answer» D. It is dextrorotatory. | |
| 658. |
In osazone formation, glucose reacts with three molecules of phenylhydrazine. Which statement is true regarding this? |
| A. | All the three molecules react in similar fashion |
| B. | Two molecules react in similar manner, while the third reacts in different way |
| C. | All the three molecules react in different ways |
| D. | None of the above is true |
| Answer» C. All the three molecules react in different ways | |
| 659. |
Which of the following statement(s) is (are) true? (i) All amino acids contain one chiral center. (ii) Some amino acids contain one, while some contain more chiral center or even no chiral center. (iii) All amino acids found in proteins have L configuration. (iv) All amino acids found in proteins have \[1{}^\circ \] amino group. |
| A. | (ii), (iii) & (iv) |
| B. | (ii) & (iii) |
| C. | (i), (iii) & (iv) |
| D. | (i) & (iv). |
| Answer» C. (i), (iii) & (iv) | |
| 660. |
Which of the following pairs can be distinguished by Fehling's solution? |
| A. | Glucose and fructose |
| B. | Glucose and sucrose |
| C. | Methanal and ethanol |
| D. | Hydroxypropanone and benzaldehyde. |
| Answer» C. Methanal and ethanol | |
| 661. |
Glucose molecule reacts with X number of molecules of phenylhydrazine to yield osazone. The value of X is |
| A. | three |
| B. | two |
| C. | one |
| D. | four |
| Answer» B. two | |
| 662. |
Nucleotides in DNA are linked by - |
| A. | hydrogen bond |
| B. | 3', 5'-phosphodiester bond |
| C. | glycosidic bond |
| D. | peptide bond |
| Answer» C. glycosidic bond | |
| 663. |
Match List I (name of vitamin) with List II (deficiency result/disease) and select the correct answer using the codes given below the lists: List I List II I. Ascorbic acid A. Beri-beri II. Retinol B. Cracked lips III. Riboflavin C. Scurvy IV. Thiamine D. Night blindness |
| A. | I-B, II-A, III-C, IV-D |
| B. | I-A, II-B, III-C, IV-D |
| C. | I-D, II-C, III-B, IV-A |
| D. | I-C, II-D, III-B, IV-A |
| Answer» E. | |
| 664. |
The \[p{{K}_{4}}\] values for the three ionizable groups X, Y and Z of glutamic acid are 4.3, 9.7 and 2.2 respectively \[\underset{X}{\mathop{H{{O}_{2}}C}}\,-C{{H}_{2}}-\underset{Y}{\mathop{\underset{_{+}N{{H}_{3}}}{\mathop{\underset{|}{\mathop{C}}\,}}\,H}}\,-\underset{Z}{\mathop{C{{O}_{2}}H}}\,\] The isoelectric point for the amino acid is: |
| A. | 7.00 |
| B. | 3.25 |
| C. | 4.95 |
| D. | 5.95 |
| Answer» C. 4.95 | |
| 665. |
When \[\alpha \]-D-glucose and \[\beta \]-D-glucose are dissolved in water in two separate beakers I and II respectively and allowed to stand, then - |
| A. | specific rotation in beaker I will decrease while in II will increase upto a constant value |
| B. | the specific rotation of equilibrium mixture in two beakers will be different |
| C. | the equilibrium mixture in both beakers will be leavorotatory |
| D. | the equilibrium mixture in both beakers will contain only cyclic form of glucose |
| Answer» B. the specific rotation of equilibrium mixture in two beakers will be different | |
| 666. |
Which of the following will not show mutarotation? |
| A. | Maltose |
| B. | Lactose |
| C. | Glucose |
| D. | Sucrose |
| Answer» E. | |
| 667. |
Accumulation of which of the following molecules in the muscles occurs as a result of vigorous exercise? |
| A. | Glycogen |
| B. | Glucose |
| C. | Pyruvic acid |
| D. | L-lactic acid |
| Answer» E. | |
| 668. |
Complete hydrolysis of starch gives: |
| A. | glucose only |
| B. | galactose and fructose in equimolar amounts |
| C. | glucose and galactose in equimolar amounts |
| D. | glucose and fructose in equimolar amounts |
| Answer» B. galactose and fructose in equimolar amounts | |
| 669. |
Which one of the following is an amine hormone? |
| A. | Thyroxine |
| B. | Oxypurin |
| C. | Insulin |
| D. | Progesterone |
| Answer» B. Oxypurin | |
| 670. |
In fructose, the possible optical isomers are |
| A. | 12 |
| B. | 8 |
| C. | 16 |
| D. | 4 |
| Answer» C. 16 | |
| 671. |
In Lassaigne's test, the organic compound is fused with a piece of sodium metal in order to |
| A. | increase the ionisation of the compound. |
| B. | decrease the melting point of the compound. |
| C. | increase the reactivity of the compound. |
| D. | convert the covalent compound into a mixture of ionic compounds. |
| Answer» E. | |
| 672. |
0.5 g mixture of \[{{K}_{2}}C{{r}_{2}}{{O}_{7}}\] and \[KMn{{O}_{4}}\] was treated with excess of KI in acidic medium. \[{{I}_{2}}\]liberated required \[100c{{m}^{3}}\] of 0.15 N \[N{{a}_{2}}{{S}_{2}}{{\text{O}}_{3}}\] solution for titration. The percentage amount of \[{{K}_{2}}C{{r}_{2}}{{O}_{7}}\] in the mixture is |
| A. | 85.36% |
| B. | 0.1464 |
| C. | 58.63% |
| D. | 0.2614 |
| Answer» C. 58.63% | |
| 673. |
A pink coloured salt turns blue on heating. The presence of which cation is most likely? |
| A. | \[C{{o}^{2+}}\] |
| B. | \[C{{u}^{2+}}\] |
| C. | \[Z{{n}^{2+}}\] |
| D. | \[F{{e}^{2+}}\] |
| Answer» B. \[C{{u}^{2+}}\] | |
| 674. |
A substance on treatment with dil. \[{{H}_{2}}S{{O}_{4}}\] liberates a colourless gas which produces (I) turbidity with baryta water and (II) turns acidified dichromate solution green. The reaction indicates the presence of |
| A. | \[CO_{3}^{2-}\] |
| B. | \[{{s}^{2-}}\] |
| C. | \[SO_{3}^{2-}\] |
| D. | \[NO_{3}^{-}\] |
| Answer» D. \[NO_{3}^{-}\] | |
| 675. |
Which of the following gives a precipitate with \[Pb{{(N{{O}_{3}})}_{2}}\] but not with \[Ba{{(N{{O}_{3}})}_{2}}\]? |
| A. | Sodium chloride |
| B. | Sodium acetate |
| C. | Sodium nitrate |
| D. | Sodium hyrogen phosphate |
| Answer» B. Sodium acetate | |
| 676. |
An orange precipitate of II group is dissolved in cone. \[HCl\]; the solution when treated with excess of water turns milky due to formation of |
| A. | \[Sn\left( OH \right)Cl\] |
| B. | \[Sb\left( OH \right)C{{l}_{2}}\] |
| C. | \[SbOCl\] |
| D. | \[Sb{{\left( OH \right)}_{2}}Cl\] |
| Answer» D. \[Sb{{\left( OH \right)}_{2}}Cl\] | |
| 677. |
The sodium extract prepared from sulphanilic acid, contains \[SC{{N}^{-}}\]. It gives blood red colouration with |
| A. | a mixture of \[N{{a}_{2}}S\] and \[C{{S}_{2}}\] |
| B. | \[FeC{{l}_{3}}\] |
| C. | \[FeS{{O}_{4}}\] |
| D. | \[N{{a}_{2}}S{{O}_{3}}\] |
| Answer» C. \[FeS{{O}_{4}}\] | |
| 678. |
\[[X]+{{H}_{2}}S{{O}_{4}}\xrightarrow{{}}[Y]\] a colourless gas with irritating smell,\[[Y]+{{K}_{2}}C{{r}_{2}}O+{{H}_{2}}S{{O}_{4}}\xrightarrow{{}}\] green solution.[X] and [Y] is: |
| A. | \[S{{O}_{3}}^{2-},S{{O}_{2}}\] |
| B. | \[C{{l}^{-}},HCl\] |
| C. | \[{{S}^{2-}},{{H}_{2}}S\] |
| D. | \[C{{O}_{3}}^{2-},C{{O}_{2}}\] |
| Answer» B. \[C{{l}^{-}},HCl\] | |
| 679. |
2.79 g of an organic compound when heated in Carius tube with cone. \[HN{{O}_{3}}\] and \[{{H}_{2}}P{{O}_{4}}\] formed is converted into \[MgN{{H}_{4}}.P{{O}_{4}}\]ppt. The ppt. on heating gave 1.332 g of \[M{{g}_{2}}{{P}_{2}}{{O}_{7}}\]. The percentage of P in the compound is |
| A. | 23.33% |
| B. | 0.1333 |
| C. | 33.33% |
| D. | 0.2666 |
| Answer» C. 33.33% | |
| 680. |
A salt which gives \[C{{O}_{2}}\] with hot conc. \[{{H}_{2}}S{{O}_{4}}\] and also decolourizes acidified\[KMn{{O}_{4}}\]. On warming is: |
| A. | \[HCO_{3}^{-}\] |
| B. | \[CO_{3}^{2-}\] |
| C. | Qxalate |
| D. | Acetate |
| Answer» D. Acetate | |
| 681. |
The presence of magnesium is confirmed in the qualitative analysis by the formation of a white crystalline precipitate of |
| A. | \[Mg{{\left( HC{{O}_{3}} \right)}_{2}}\] |
| B. | \[MgN{{H}_{4}}P{{O}_{4}}\] |
| C. | \[MgN{{H}_{4}}{{\left( HC{{O}_{3}} \right)}_{3}}\] |
| D. | \[MgC{{O}_{3}}\] |
| Answer» C. \[MgN{{H}_{4}}{{\left( HC{{O}_{3}} \right)}_{3}}\] | |
| 682. |
An organic compound has C and H percentage in the ratio 6 : 1 and C and O percentage in the ratio 3:4 the compound is |
| A. | HCHO |
| B. | \[C{{H}_{3}}OH\] |
| C. | \[C{{H}_{3}}C{{H}_{2}}OH\] |
| D. | \[{{(COOH)}_{2}}\] |
| Answer» B. \[C{{H}_{3}}OH\] | |
| 683. |
0.59 g of an organic substance when treated with caustic soda evolved ammonia which required 20 cc of N/2 sulphuric acid for neutralisation. The percentage of nitrogen is |
| A. | 26.32% |
| B. | 0.4 |
| C. | 53.6% |
| D. | 0.636 |
| Answer» B. 0.4 | |
| 684. |
0.45 g of acid (molecular weight 90) is neutralized by 20 ml of 0.5N caustic potash. The basicity of acid is |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» C. 3 | |
| 685. |
Prussian blue is formed when |
| A. | ferrous sulphate reacts with \[FeC{{l}_{3}}\] |
| B. | ferric sulphate reacts with \[{{K}_{4}}Fe{{\left( CN \right)}_{6}}\] |
| C. | ferrous ammonium sulphate reacts with \[FeC{{l}_{3}}\] |
| D. | ammonium sulphate reacts with \[N{{O}_{2}}\] |
| Answer» C. ferrous ammonium sulphate reacts with \[FeC{{l}_{3}}\] | |
| 686. |
0.24 g of a volatile liquid on vaporization gives 45 ml of vapours at NTP. What will be the vapour density of the substance? (Density of \[{{H}_{2}}=0.089g\text{ }{{L}^{-1}}\]) |
| A. | 95.39 |
| B. | 39.95 |
| C. | 99.53 |
| D. | 59.93 |
| Answer» E. | |
| 687. |
A gas "X" is passed through water to form a saturated solution. The aqueous solutions on treatment with the \[AgN{{O}_{3}}\] gives a white preciptate. The saturated aqueous solution also dissolves magnesium ribbon with evolution of a colourless gas "Y" Identify 'X' and 'Y?. |
| A. | \[X=C{{O}_{2}},Y=C{{l}_{2}}\] |
| B. | \[X=C{{l}_{2}},Y=C{{O}_{2}}\] |
| C. | \[X=C{{l}_{2}},Y={{H}_{2}}\] |
| D. | \[X={{H}_{2}},Y=C{{l}_{2}}\] |
| Answer» D. \[X={{H}_{2}},Y=C{{l}_{2}}\] | |
| 688. |
In Kjeldahl's method for the estimation of\[{{\operatorname{N}}_{2}}\], potassium sulphate and copper sulphate are used. On the basis of their functions which of the following statement(s) is/are correct?I. Potassium sulphate raises the bpt. And ensures complete reaction.II. Copper sulphate acts as catalyst.III. Potassium sulphate acts as catalyst and copper sulphate raises the bpt. |
| A. | Only III is correct |
| B. | I and II are correct |
| C. | Only II is correct |
| D. | None is correct |
| Answer» C. Only II is correct | |
| 689. |
A salt on treatment with dil. \[HCl\] gives a pungent smelling gas and a yellow precipitate. The salt gives green flame when tested. The solution gives a yellow precipitate with potassium chromate. The salt is |
| A. | \[NiS{{O}_{4}}\] |
| B. | \[Ba{{S}_{2}}{{O}_{3}}\] |
| C. | \[Pb{{S}_{2}}{{O}_{3}}\] |
| D. | \[CuS{{O}_{4}}\] |
| Answer» C. \[Pb{{S}_{2}}{{O}_{3}}\] | |
| 690. |
The best method for the separation of naphthalene and benzoic acid from their mixture is: |
| A. | Distillation |
| B. | Sublimation |
| C. | Chromatography |
| D. | Crystallisation |
| Answer» C. Chromatography | |
| 691. |
Compound and \[\underset{\left( Q \right)}{\mathop{C{{H}_{3}}-C{{H}_{2}}-O-C{{H}_{2}}-C{{H}_{2}}}}\,\] can be differentiated by: |
| A. | \[{{N}_{3}}{{O}^{\oplus }},Na\] |
| B. | \[{{H}_{3}}{{O}^{\oplus }}\], Tollens' test |
| C. | \[{{H}_{3}}{{O}^{\oplus }}\] Fehlingtest |
| D. | All of these |
| Answer» E. | |
| 692. |
Potassium chromate solution is added to an aqueous solution of a metal chloride. The precipitate thus obtained is insoluble in acetic acid. When precipitate is subjected to flame test the colour of the flame is |
| A. | lilac |
| B. | apple green |
| C. | crimson red |
| D. | golden yellow |
| Answer» C. crimson red | |
| 693. |
For preparing 250 mL of N/20 solution of Mohr 's salt, the amount of Mohr's salt needed is |
| A. | 9.8 g |
| B. | 4.9 g |
| C. | 19.6 g |
| D. | 3.2 g |
| Answer» C. 19.6 g | |
| 694. |
Volume of 3% solution of sodium carbonate necessary to neutralise a litre of 0.1N sulphuric acid |
| A. | 176.66 ml |
| B. | 156.6 ml |
| C. | 116.0 ml |
| D. | 196.1 ml |
| Answer» B. 156.6 ml | |
| 695. |
If 0.2 gram of an organic compound containing carbon, hydrogen and oxygen on combustion, yielded 0.147 gram carbon dioxide and 0.12 gram water. What will be the content of oxygen in the substance? |
| A. | 73.29% |
| B. | 0.7845 |
| C. | 83.23% |
| D. | 0.895 |
| Answer» B. 0.7845 | |
| 696. |
An aqueous solution of colourless metal sulphate M gives a white precipitate with\[N{{H}_{4}}OH\]. This was soluble in excess of\[N{{H}_{4}}OH\]. On passing \[{{H}_{2}}S\] through this solution a white ppt. is formed. The metal M in the salt is |
| A. | Ca |
| B. | Ba |
| C. | Al |
| D. | Zn |
| Answer» E. | |
| 697. |
\[KMn{{O}_{4}}\] reacts with oxalic acid as:\[MnO_{4}^{-}+{{C}_{2}}O_{4}^{2-}+{{H}^{+}}\xrightarrow{{}}M{{n}^{2+}}+{{CO}_{2}}+{{H}_{2}}O\]Hence, 50 ml of 0.04 M \[KMn{{O}_{4}}\] is acidic medium is chemically equivalent to |
| A. | 100 ml of 0.1M \[{{H}_{2}}{{C}_{2}}{{O}_{4}}\] |
| B. | 50 ml of 0.2 M \[{{H}_{2}}{{C}_{2}}{{O}_{4}}\] |
| C. | 50 ml of 0.1M \[{{H}_{2}}{{C}_{2}}{{O}_{4}}\] |
| D. | 25 ml of 0.1M \[{{H}_{2}}{{C}_{2}}{{O}_{4}}\] |
| Answer» D. 25 ml of 0.1M \[{{H}_{2}}{{C}_{2}}{{O}_{4}}\] | |
| 698. |
An aqueous solution of \[FeS{{O}_{4}},A{{l}_{2}}{{(S{{O}_{4}})}_{3}}\] and chrome alum is heated with excess of \[N{{a}_{2}}{{O}_{2}}\] and filtered. The materials obtained are:- |
| A. | A colourless filtrate and a green residue. |
| B. | A yellow filtrate and a green residue. |
| C. | A yellow filtrate and a brown residue. |
| D. | A green filtrate and a brown residue. |
| Answer» C. A yellow filtrate and a brown residue. | |
| 699. |
1.25 g of a sample of \[N{{a}_{2}}C{{O}_{3}}\] and \[NaS{{O}_{4}}\] is dissolved in 250 ml solution. 25 ml of this solution neutralises 20 ml of 0. 1 N\[{{H}_{2}}S{{O}_{4}}\]. The % of \[N{{a}_{2}}{{O}_{2}}\] in this sample is |
| A. | 84.8% |
| B. | 0.0848 |
| C. | 15.2% |
| D. | 0.424 |
| Answer» B. 0.0848 | |
| 700. |
A solution containing \[A{{s}^{3+}},C{{d}^{2+}},N{{i}^{2+}}\] and \[Z{{n}^{2+}}\] is made alkaline with dilute \[N{{H}_{4}}OH\] and treated with \[{{H}_{2}}S\]. The precipitate obtained will consist of |
| A. | \[A{{s}_{2}}{{S}_{3}}\] and CdS |
| B. | CdS.NiS and ZnS |
| C. | NiS and ZnS |
| D. | Sulphide of all ions |
| Answer» E. | |