MCQOPTIONS
Saved Bookmarks
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.
| 551. |
Which one of the following is not the use of graphite ? |
| A. | Lead pencils |
| B. | Abrasive |
| C. | Lubricant |
| D. | Electrode of electrolytic cell |
| Answer» C. Lubricant | |
| 552. |
Which of the following does not contain phosphorus ? |
| A. | Yolk of egg |
| B. | Bone |
| C. | Nerves |
| D. | Steel |
| Answer» E. | |
| 553. |
Phosphoric acid is a weak acid and its basicity is____________________? |
| A. | 1 |
| B. | 3 |
| C. | zero |
| D. | 2 |
| Answer» C. zero | |
| 554. |
Boric acid cannot be used__________________? |
| A. | As antiseptic in medicine |
| B. | For washing eyes |
| C. | In soda bottles |
| D. | For enamel and glazes |
| Answer» D. For enamel and glazes | |
| 555. |
P2O5 is a hygroscopic powder which sublimes at______________? |
| A. | 260°C |
| B. | 360°C |
| C. | 630°C |
| D. | 620°C |
| Answer» C. 630°C | |
| 556. |
Which element can form tripositive ion ? |
| A. | Beryllium |
| B. | Carbon |
| C. | Silicon |
| D. | Aluminium |
| Answer» E. | |
| 557. |
Which of the following is different with respect to physical appearance ? |
| A. | Arsenic |
| B. | Phosphorus |
| C. | Antimony |
| D. | Bismuth |
| Answer» C. Antimony | |
| 558. |
Compounds of nitrogen and phosphorus are mostly________________? |
| A. | ionic |
| B. | covalent |
| C. | polar |
| D. | all varieties are possible |
| Answer» C. polar | |
| 559. |
Which of the following shows inert pair effect ? |
| A. | boron |
| B. | carbon |
| C. | silicon |
| D. | tin |
| Answer» E. | |
| 560. |
Substance which is found in dried up lakes of Tibet and California is_______________? |
| A. | Tincal |
| B. | Boric acid |
| C. | Calcium carbonate |
| D. | Colemanite |
| Answer» B. Boric acid | |
| 561. |
The metal which is used in thermite process because of its activity is____________________? |
| A. | iron |
| B. | copper |
| C. | aluminium |
| D. | zinc |
| Answer» D. zinc | |
| 562. |
Which of the following does not give Borax bead test ? |
| A. | Cu |
| B. | Cr |
| C. | Ni |
| D. | A1 |
| Answer» E. | |
| 563. |
Boron is non-netal whereas A1 is metal. It is due to_______________________? |
| A. | Small size |
| B. | High nuclear charge |
| C. | Both A and B |
| D. | No authorized justification yet |
| Answer» D. No authorized justification yet | |
| 564. |
Tincal is a mineral of___________________? |
| A. | A1 |
| B. | Si |
| C. | B |
| D. | C |
| Answer» D. C | |
| 565. |
Because of its ability to combine with both oxygen and nitrogen aluminium metal is used_____________? |
| A. | As nitrometer |
| B. | To remove air bubbles from molten metal |
| C. | To produce alloy |
| D. | As insulator |
| Answer» C. To produce alloy | |
| 566. |
Silicon differ from silica by a group of__________________? |
| A. | Ch3 |
| B. | OH |
| C. | OCH3 |
| D. | O2 |
| Answer» B. OH | |
| 567. |
In network of silica (SiO2) each silicon atom is surrounded by _____________ atoms of osygen? |
| A. | 4 |
| B. | 2 |
| C. | 1 |
| D. | 6 |
| Answer» B. 2 | |
| 568. |
Orthoboric acid is 2.6% soluble in water at 40?C and ___________at 107°C. |
| A. | 26% |
| B. | 27% |
| C. | 37% |
| D. | <2.6% |
| Answer» D. <2.6% | |
| 569. |
Second ionization potential of alkali metals are very high due to_______________? |
| A. | being s-block elements |
| B. | inert gas configurations |
| C. | ns1 electronic configuration |
| D. | being metals |
| Answer» C. ns1 electronic configuration | |
| 570. |
The preparation of benzene from acetylene can also be said as_________________? |
| A. | Oxidation |
| B. | Polymerization |
| C. | Dehydration |
| D. | Condensation |
| Answer» C. Dehydration | |
| 571. |
Nitronium ion is___________________? |
| A. | NO3 |
| B. | NO |
| C. | NO2- |
| D. | NO2+ |
| Answer» E. | |
| 572. |
Benzene is heated in air with V2O5 at 450°C it undergoes________________? |
| A. | Substitution reaction |
| B. | Addition reaction |
| C. | Elimination reaction |
| D. | Oxidation reaction |
| Answer» E. | |
| 573. |
One of the outstanding features of boron is its ability to form__________________? |
| A. | Molecular addition compounds |
| B. | Molecular crystals |
| C. | Semiconductors |
| D. | Ionic compounds |
| Answer» B. Molecular crystals | |
| 574. |
Aniline is a derivative of benzene which contains__________________? |
| A. | Imino group |
| B. | Amino group |
| C. | Amide group |
| D. | Nitro group |
| Answer» C. Amide group | |
| 575. |
In benzene sulphonic acid the sulphonic group is attached with benzene ring through ___________________? |
| A. | Hydrogen |
| B. | Oxygen |
| C. | Sulphur |
| D. | OH |
| Answer» D. OH | |
| 576. |
The hydrolysis of Benzenetrizonide will yield three moles of____________________? |
| A. | Glyoxime |
| B. | Benzaldehyde |
| C. | Glycol |
| D. | Glyoxal |
| Answer» E. | |
| 577. |
What catalyst is employed when benzene is prepared from acetylene at 70°C? |
| A. | Cr2O3 + A2O3 + SiO2 |
| B. | Raney nickel |
| C. | Organo-nickel |
| D. | Ni 250 – 300°C |
| Answer» D. Ni 250 – 300°C | |
| 578. |
The resonance energy of benzene is__________________? |
| A. | 150.5 kJ/mol |
| B. | 250.5 kJ/mol |
| C. | 150.5 Cal/mol |
| D. | 250.5 Cal/mol |
| Answer» B. 250.5 kJ/mol | |
| 579. |
Reacting bromine with benzene in the presence of sunlight will result in_______________? |
| A. | The rupturing of benzene ring |
| B. | Substitution reaction |
| C. | Addition reaction |
| D. | No-reaction |
| Answer» D. No-reaction | |
| 580. |
Which one of the following methods will not give benzene ? |
| A. | Heating sod. Salt of Benzoic acid with soda lime |
| B. | Distilling phenol with Zn dust |
| C. | Chlorobenzene with NaOH at 360°C & 150atm. |
| D. | Hydrolysis of benzene sulphonic acid with super heated steam |
| Answer» D. Hydrolysis of benzene sulphonic acid with super heated steam | |
| 581. |
During sulphonation of benzene H2SO4 generates the electrophile _________________? |
| A. | HSO4- |
| B. | SO2 |
| C. | SO3 |
| D. | H+ |
| Answer» D. H+ | |
| 582. |
Sodium is not observed in +2 oxidation state because of its__________________? |
| A. | high first ionization potential |
| B. | high second ioniation potential |
| C. | high ionic radius |
| D. | high electronegativity |
| Answer» C. high ionic radius | |
| 583. |
The element cesium bears resemblance with________________? |
| A. | Ca |
| B. | Cr |
| C. | Both of the above |
| D. | None of the above |
| Answer» E. | |
| 584. |
Magnesium metal does not burn in the vessel containing_______________? |
| A. | N2 |
| B. | O2 |
| C. | N2 and O2 |
| D. | Ne |
| Answer» E. | |
| 585. |
Nitrates of which pair of elements give different products on thermal decomposition ? |
| A. | Na K |
| B. | Mg Ca |
| C. | Li Na |
| D. | Li Ca |
| Answer» D. Li Ca | |
| 586. |
Addition of 2% gypsum in cement________________? |
| A. | Triggers hydration |
| B. | Triggers hydrolysis |
| C. | Prevents rapid hardening |
| D. | all of the above |
| Answer» D. all of the above | |
| 587. |
Which one can form complex ? |
| A. | Na |
| B. | Cr |
| C. | Li |
| D. | K |
| Answer» D. K | |
| 588. |
The oxides of beryllium BeO is_______________? |
| A. | Acidic |
| B. | Basic |
| C. | Amphoteric |
| D. | Neutral |
| Answer» D. Neutral | |
| 589. |
First ionization potential of alkaline earth metal is greater than alkali metals because___________________? |
| A. | They are more reactive |
| B. | They have greater atomic radii |
| C. | They have smaller atomic sizes |
| D. | All |
| Answer» D. All | |
| 590. |
Li is different from its family members due to____________________? |
| A. | small size |
| B. | high charge density |
| C. | less electropositivity |
| D. | all of the above |
| Answer» E. | |
| 591. |
The ore CaSO4.H2O has the general name_______________? |
| A. | Gypsum |
| B. | Dolomite |
| C. | Calcite |
| D. | Plaster of Paris |
| Answer» B. Dolomite | |
| 592. |
Phenanthrene is a fused polycyclic compound contains __________ benzene rings ? |
| A. | Two |
| B. | Three |
| C. | Four |
| D. | Five |
| Answer» C. Four | |
| 593. |
How many electrons are there in benzene to form delocalized electron cloud________________? |
| A. | 3 |
| B. | 4 |
| C. | 6 |
| D. | 8 |
| Answer» D. 8 | |
| 594. |
Which element is necessary for normal leaf development ? |
| A. | Si |
| B. | Ba |
| C. | Mg |
| D. | Ca |
| Answer» E. | |
| 595. |
Which of the following sulphates is not soluble in water ? |
| A. | Sodium sulphate |
| B. | Potassium sulphate |
| C. | Zinc sulphate |
| D. | Barium sulphate |
| Answer» E. | |
| 596. |
Alkali and alkaline earth metals impart colours when heated over burner. It is due to______________? |
| A. | Smaller electronegativity of alkali metals |
| B. | Smaller ionic radius of these metals |
| C. | De-excitation of electrons from higher energy levels to low energy level |
| D. | Excitation of electrons from low energy levels to higher energy levels |
| Answer» D. Excitation of electrons from low energy levels to higher energy levels | |
| 597. |
In diaphragm cell level of brine in anode compartment is kept slightly higher which prevents_______________? |
| A. | Hydroxide ions to reach anode |
| B. | Chlorine gas to mix |
| C. | Cathode to decay |
| D. | All of the above |
| Answer» B. Chlorine gas to mix | |
| 598. |
Carnalite has chemical formula__________________? |
| A. | KCI |
| B. | KCI.MgCl2.6H2O |
| C. | Na2B4O7.10H2O |
| D. | CaCO3.MgCO3 |
| Answer» C. Na2B4O7.10H2O | |
| 599. |
NaOH is named as caustic soda because________________? |
| A. | It corrodes the organic tissues |
| B. | It is used in soda water |
| C. | It reacts with chlorine gas |
| D. | It reacts with fats to form soap |
| Answer» B. It is used in soda water | |
| 600. |
Electrolysis of dilute solution of NaCl results at the anode_______________? |
| A. | sodium |
| B. | hydrogen |
| C. | chlorine |
| D. | oxygen |
| Answer» E. | |