MCQOPTIONS
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MCQOPTIONS
This section includes 1262 Mcqs, each offering curated multiple-choice questions to sharpen your Chemistry Mcqs knowledge and support exam preparation. Choose a topic below to get started.
| 501. |
The process of fermentation of starch involve many enzymes the sequence of enzymes used are____________________? |
| A. | Diastase-maltase-zymase |
| B. | Zymase-maltase-diastase |
| C. | Maltase-diastase-zymase |
| D. | Diastase-zymase-maltase |
| Answer» B. Zymase-maltase-diastase | |
| 502. |
K2Cr2O7/H2SO4 generate____________________? |
| A. | Oxygen |
| B. | Hydrogen |
| C. | Nascent oxygen[O] |
| D. | Nascent hydrogen[H] |
| Answer» D. Nascent hydrogen[H] | |
| 503. |
Heating phenol with Zn will yield_________________? |
| A. | Benzene |
| B. | Benzoic acid |
| C. | Phenoxide |
| D. | Cyclohexane |
| Answer» B. Benzoic acid | |
| 504. |
Which one of the following species is not an electrophile ? |
| A. | NH3 |
| B. | Br+ |
| C. | H+ |
| D. | BF3 |
| Answer» B. Br+ | |
| 505. |
Dehalogenation of ethyl tetrahalide will give____________________? |
| A. | ethene |
| B. | ethyne |
| C. | ethyl halide |
| D. | all of the above are possible |
| Answer» C. ethyl halide | |
| 506. |
The ether used in Wurtz synthesis is__________________? |
| A. | acidic |
| B. | basic |
| C. | aqueous |
| D. | dry |
| Answer» E. | |
| 507. |
Which one of the following alcohols will be formed when ethyl magnesium bromide reacts with acetone ? |
| A. | primary alcohol |
| B. | secondary alcohol |
| C. | tertiary alcohol |
| D. | dihydric alcohol |
| Answer» D. dihydric alcohol | |
| 508. |
Raney nickel is prepared from ______________________ by treating with caustic soda? |
| A. | Ni-Cu alloy |
| B. | Ni-Fe alloy |
| C. | Ni-Al alloy |
| D. | Ni-Mg alloy |
| Answer» D. Ni-Mg alloy | |
| 509. |
In primary alkyl halides the halogen atom is attached to a carbon which is further attached to how many carbon atoms__________________? |
| A. | two |
| B. | three |
| C. | one |
| D. | four |
| Answer» D. four | |
| 510. |
Which one of the following molecules does not form alcohol when reacts with Grignard reagent ? |
| A. | formaldehyde |
| B. | acetaldehyde |
| C. | propanone |
| D. | carbondioxide |
| Answer» E. | |
| 511. |
50% inversion of configuration of molecules take place in a___________________? |
| A. | E1 – reaction |
| B. | E2 – reaction |
| C. | SN1 – reaction |
| D. | SN2 – reaction |
| Answer» D. SN2 – reaction | |
| 512. |
Which one of the following is termed as benzul alcohol ? |
| A. | C6H5OH |
| B. | C6H5CH(OH)2 |
| C. | C6H5CH2OH |
| D. | C6H5COOH |
| Answer» D. C6H5COOH | |
| 513. |
The best method of preparation of alkyl halides is a reaction of alcohol with__________________? |
| A. | Zn / HCI |
| B. | SOCl2 / Pyridine |
| C. | PCI3 |
| D. | PCI5 |
| Answer» C. PCI3 | |
| 514. |
Which C-X bond has the highest bond energy per mole ? |
| A. | C-F |
| B. | C-C |
| C. | C-Br |
| D. | C-I |
| Answer» B. C-C | |
| 515. |
Upto ___________________ C atoms alkanes are gases? |
| A. | 2 |
| B. | 3 |
| C. | 4 |
| D. | 6 |
| Answer» D. 6 | |
| 516. |
Vinylacetylene combines with HCI to form___________________? |
| A. | polyacetylene |
| B. | benzene |
| C. | chloroprene |
| D. | divinyl acetylene |
| Answer» D. divinyl acetylene | |
| 517. |
Addition of CH3COOH and CH3COONa gives in water_______________? |
| A. | Standard solution |
| B. | buffer solution |
| C. | acidic buffer solution |
| D. | both B & C |
| Answer» E. | |
| 518. |
The gas used in manufacturing of urea fertilizer__________________? |
| A. | C2H6 |
| B. | C2H4 |
| C. | C2H2 |
| D. | CH4 |
| Answer» E. | |
| 519. |
Sabatier Senderns reaction involve _____________ in presence of Ni? |
| A. | Aalkene & H2 |
| B. | alkene & O2 |
| C. | alkene & N2 |
| D. | alkyne & Cl2 |
| Answer» B. alkene & O2 | |
| 520. |
Which of the following substance do not show continuous solubility curve ? |
| A. | KCIO4 |
| B. | Na2SO4. 10H2O |
| C. | K2Cr2O7 |
| D. | PbCl2 |
| Answer» C. K2Cr2O7 | |
| 521. |
Clemmensens reduction infolves the reduction of___________________? |
| A. | ketone |
| B. | aldehyde |
| C. | alkane |
| D. | all of the above |
| Answer» B. aldehyde | |
| 522. |
Soda lime is a mixture of____________________? |
| A. | CaO and KOH |
| B. | CaO and NaOH |
| C. | NaOH and Na2O |
| D. | Na2O and KOH |
| Answer» C. NaOH and Na2O | |
| 523. |
Which is the strongest acid ? |
| A. | HCIO |
| B. | HCIO2 |
| C. | HCIO3 |
| D. | HCIO4 |
| Answer» E. | |
| 524. |
Alkanes containing a methyl group on main chain at 2nd carbon are called________________? |
| A. | iso-alkane |
| B. | normal-alkane |
| C. | neo-alkane |
| D. | branched-alkane |
| Answer» B. normal-alkane | |
| 525. |
Which of the following is the weakest reducing agent ? |
| A. | HF |
| B. | HBr |
| C. | HC |
| D. | HI |
| Answer» B. HBr | |
| 526. |
Order of ease of halogenation in alkane is________________? |
| A. | I2>Cl2>Br2>F2 |
| B. | F2>Cl2>I2>Br2 |
| C. | F2>Cl2>Br2>I2 |
| D. | Cl2>F2>Br2>I2 |
| Answer» D. Cl2>F2>Br2>I2 | |
| 527. |
Alkenes are produced from dehalogenation of________________? |
| A. | dihalo alkane |
| B. | trihalo alkane |
| C. | vicinal dihalo alkane |
| D. | vicinal trihalo alkane |
| Answer» D. vicinal trihalo alkane | |
| 528. |
Which of the following will be acidic_____________? |
| A. | Which of the following will be acidic_____________? |
| B. | 1-butyne |
| C. | ethyne |
| D. | all of the above |
| Answer» E. | |
| 529. |
The number of molecules taking part in the rate determining step is called___________________? |
| A. | Order of reaction |
| B. | Rate of reaction |
| C. | Mole of a reaction |
| D. | Extent of a reaction |
| Answer» B. Rate of reaction | |
| 530. |
Alkanes are also known as________________? |
| A. | saturated hydrocarbon |
| B. | unsaturated hydrocarbon |
| C. | paraffins |
| D. | both A & C |
| Answer» D. both A & C | |
| 531. |
Which of the following statements is incorrect about fluorine_______________? |
| A. | fluorine is restricted to -1 oxidation state |
| B. | fluorine follows octet rule and as well as extended octet rule |
| C. | fluorine has lowest dissociation energy among the halogens |
| D. | both B and C |
| Answer» E. | |
| 532. |
The anhydride of HCIO4 is_________________? |
| A. | Cl2O |
| B. | Cl2O6 |
| C. | ClO2 |
| D. | Cl2O7 |
| Answer» E. | |
| 533. |
The colour of chlorine gas is_______________? |
| A. | pale yellow |
| B. | freenish yellow |
| C. | reddish brown |
| D. | grayish black |
| Answer» C. reddish brown | |
| 534. |
Which one of the following is the weakest acid in water__________________? |
| A. | HF |
| B. | HCI |
| C. | HBr |
| D. | HI |
| Answer» B. HCI | |
| 535. |
In which compound nitrogen has maximum oxidation state____________________? |
| A. | N2O |
| B. | NO2 |
| C. | HNO2 |
| D. | HNO3 |
| Answer» E. | |
| 536. |
Among the halogens the rare element is________________? |
| A. | Fluorine |
| B. | Chlorine |
| C. | Astatine |
| D. | Iodine |
| Answer» D. Iodine | |
| 537. |
Bleaching powder is not used for bleaching________________? |
| A. | Cotton |
| B. | Costly fabrics |
| C. | Linen |
| D. | Paper pulb |
| Answer» C. Linen | |
| 538. |
The chemical formula of sodium hypochlorite is________________? |
| A. | NaCLO |
| B. | NaClO2 |
| C. | NaClO3 |
| D. | NaClO4 |
| Answer» B. NaClO2 | |
| 539. |
Which of the halogen can displace other three elements ? |
| A. | Flourine |
| B. | Chlorine |
| C. | Iodine |
| D. | Bromine |
| Answer» B. Chlorine | |
| 540. |
Consider the following reaction- 2KCIO3 + H2C2O4 + H2SO4 ? K2SO4 + 2H2O + 2CO2 + Oxide Which oxide of chlorine is produced in the above reaction ? |
| A. | Cl2O |
| B. | ClO2 |
| C. | Cl2O6 |
| D. | Cl2O7 |
| Answer» C. Cl2O6 | |
| 541. |
Vander Waals forces are stronger in_______________? |
| A. | F2 |
| B. | Cl2 |
| C. | Br2 |
| D. | I2 |
| Answer» E. | |
| 542. |
The most electronegative element among the following is_________________? |
| A. | Sb |
| B. | N |
| C. | As |
| D. | P |
| Answer» C. As | |
| 543. |
FeSO4 forms brown ring with________________? |
| A. | N2O3 |
| B. | NO2 |
| C. | NO |
| D. | N2O |
| Answer» D. N2O | |
| 544. |
Oxygen does not react with all except_________________? |
| A. | Alkali |
| B. | Acid |
| C. | Water |
| D. | Metals |
| Answer» E. | |
| 545. |
Which one of following is not a property of pure quartz ? |
| A. | Coloured solid |
| B. | Brittle |
| C. | Hard |
| D. | All of above |
| Answer» B. Brittle | |
| 546. |
Phosphene gas will be produced if phosphorous acid is subjected to___________________? |
| A. | Oxidation |
| B. | Reduction |
| C. | Decomposition |
| D. | Both b & c |
| Answer» E. | |
| 547. |
Phosphorous acid upon thermal decomposition yields phosphoric acid and____________________? |
| A. | Phosphine |
| B. | Phosphorus |
| C. | Water |
| D. | Phosphorus pentoxide |
| Answer» B. Phosphorus | |
| 548. |
Identify the correct statement regarding CO_______________? |
| A. | it combines with H2O to form carbonic acid |
| B. | it reacts with red blood cells of haemoglobin |
| C. | it is powerful oxidizing agent |
| D. | it is used to prepare aerated drinks |
| Answer» C. it is powerful oxidizing agent | |
| 549. |
Ozonolysis of benzene produces___________________? |
| A. | Glycol |
| B. | Glyoxal |
| C. | Vicinal diol |
| D. | Both B & C |
| Answer» C. Vicinal diol | |
| 550. |
Borax is a white crystalline solid and it is_________________? |
| A. | More soluble in cold water |
| B. | More soluble in hot water |
| C. | Insoluble in water |
| D. | Soluble only in organic solvents |
| Answer» C. Insoluble in water | |