MCQOPTIONS
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MCQOPTIONS
This section includes 29 Mcqs, each offering curated multiple-choice questions to sharpen your Chemistry Mcqs knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
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 | |
| 2. |
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 | |
| 3. |
Boron in soil has been considered micronutrient for |
| A. | Soil porocity |
| B. | Proper growth of plants |
| C. | Alkalinity of soil |
| D. | All |
| Answer» C. Alkalinity of soil | |
| 4. |
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 | |
| 5. |
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 | |
| 6. |
Which of the following does not give Borax bead test? |
| A. | Cu |
| B. | Cr |
| C. | Ni |
| D. | A1 |
| Answer» E. | |
| 7. |
Special features of borate glass is that it is |
| A. | Heat resistant |
| B. | Low melting |
| C. | Used to prepare chemical garden |
| D. | Green in colour |
| Answer» B. Low melting | |
| 8. |
The metal which is used in thermite process because of its activity is |
| A. | Iron |
| B. | Copper |
| C. | Aluminium |
| D. | Zinc |
| Answer» D. Zinc | |
| 9. |
Aluminium oxide is |
| A. | Acidic oxide |
| B. | Basic oxide |
| C. | Amphoteric oxide |
| D. | It does not exists |
| Answer» D. It does not exists | |
| 10. |
Which of the following shows inert pair effect? |
| A. | Boron |
| B. | Carbon |
| C. | Silicon |
| D. | Tin |
| Answer» E. | |
| 11. |
Which electronic configuration corresponds to an element of group IIIA? |
| A. | 1s2 2s2 2p3 |
| B. | 1s2 2s2 2p6 3s2 3p1 |
| C. | 1s2 2s2 2p4 |
| D. | 1s2 2s2 2p6 3s2 3p6 4s2 3d1 |
| Answer» C. 1s2 2s2 2p4 | |
| 12. |
Tincal is a mineral of |
| A. | A1 |
| B. | Si |
| C. | B |
| D. | C |
| Answer» D. C | |
| 13. |
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 | |
| 14. |
The process of aluminium extraction is called |
| A. | Hall process |
| B. | Thermite process |
| C. | Haber process |
| D. | Contact process |
| Answer» B. Thermite process | |
| 15. |
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 | |
| 16. |
Aqueous solution of borax above 62?C gives crystals of |
| A. | Na2B4O7.4H2O |
| B. | Na2B4O7.5H2O |
| C. | Na2B4O7.2H2O |
| D. | Na2B4O7.10H2O |
| Answer» C. Na2B4O7.2H2O | |
| 17. |
Silicon differ from silica by a group of |
| A. | Ch3 |
| B. | ?OH |
| C. | OCH3 |
| D. | O2 |
| Answer» B. ?OH | |
| 18. |
Which of the following is not a use of silicon? |
| A. | Lubricants |
| B. | Hydraulic brakes |
| C. | Antifreeze |
| D. | Water repellent |
| Answer» D. Water repellent | |
| 19. |
CO2 is gas while SiO2 is solid at room temperature. |
| A. | Carbon is non-metal while silicon is semi-metal |
| B. | CO2 is an independent molecule while SiO2 has network covalent structure |
| C. | CO2 forms multiple bond while silicon does not form multiple bonds |
| D. | Silicon has all sigma bonds |
| Answer» C. CO2 forms multiple bond while silicon does not form multiple bonds | |
| 20. |
Boron is non metal while other elements of IIIA group are metals. This is because |
| A. | It has small size |
| B. | It has high nuclear charge |
| C. | It forms molecular addition compounds |
| D. | All of the above |
| Answer» E. | |
| 21. |
The coloured glassy mass in borax bead test is due to the formation of |
| A. | Metal borate |
| B. | Metal meta borate |
| C. | Metal boride |
| D. | Metal silicate |
| Answer» C. Metal boride | |
| 22. |
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 | |
| 23. |
The chief ore of A? is: |
| A. | Na3A?F6 |
| B. | A?2O32H2O |
| C. | A?2O3H2O |
| D. | A?2O33H2O |
| Answer» C. A?2O3H2O | |
| 24. |
If temperature of gallium arsenide is increased then its conductivity will |
| A. | Decrease |
| B. | Increase |
| C. | Remains constant |
| D. | First decreases then increases |
| Answer» C. Remains constant | |
| 25. |
Which of the following will decompose to produce litharge |
| A. | Pb2O |
| B. | Pb3O4 |
| C. | PbO2 |
| D. | All of the above |
| Answer» C. PbO2 | |
| 26. |
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 | |
| 27. |
Which element can form tripositive ion? |
| A. | Beryllium |
| B. | Carbon |
| C. | Silicon |
| D. | Aluminium |
| Answer» E. | |
| 28. |
Which of the following is metasilicic acid? |
| A. | H2SnO3 |
| B. | H2SiO3 |
| C. | H3AsO4 |
| D. | H3SbO4 |
| Answer» C. H3AsO4 | |
| 29. |
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% | |