MCQOPTIONS
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MCQOPTIONS
This section includes 75 Mcqs, each offering curated multiple-choice questions to sharpen your Chemistry knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Name the scientist who stated that matter can be converted into energy . |
| A. | Boyle |
| B. | Lavoisier |
| C. | Avogadro |
| D. | Einstein |
| Answer» E. | |
| 2. |
Air is |
| A. | Compound |
| B. | element |
| C. | mixture |
| D. | solution |
| Answer» D. solution | |
| 3. |
Which one is the pure element |
| A. | glass |
| B. | cement |
| C. | sodium |
| D. | none of these |
| Answer» D. none of these | |
| 4. |
The isotopes of chlorine with mass number 35 and 37 exist in the ratio of |
| A. | 1 : 2 |
| B. | 2 : 3 |
| C. | 3 : 1 |
| D. | 3 : 4 |
| Answer» D. 3 : 4 | |
| 5. |
The father of modern chemistry is |
| A. | Priestley |
| B. | Lavoisier |
| C. | Dalton |
| D. | Mendeleev |
| Answer» C. Dalton | |
| 6. |
The total number of electrons present in 18ml of water (density of water is 1g/ml) |
| A. | 6.02 x 10 |
| B. | 6.02 x 10 |
| C. | 6.02 x 10 |
| D. | 6.02 x 10 |
| Answer» D. 6.02 x 10 | |
| 7. |
Which one of the following laws explain the formation of carbon monoxide and carbon dioxide from carbon and oxygen ? |
| A. | Law of conservation of mass |
| B. | Law of multiple proportion |
| C. | Law of reciprocal proportions |
| D. | Law of definite proportions |
| Answer» C. Law of reciprocal proportions | |
| 8. |
'Misch metal' is widely used in manufacture of which of the following |
| A. | material of car brake |
| B. | smoke detectors |
| C. | cigarette lighters |
| D. | emergency lights |
| Answer» D. emergency lights | |
| 9. |
Which one is the compound in the following ? |
| A. | Mercury |
| B. | Ozone |
| C. | Air |
| D. | Ammonia |
| Answer» E. | |
| 10. |
Diamond is |
| A. | an element |
| B. | a compound |
| C. | a mixture |
| D. | a liquid |
| Answer» B. a compound | |
| 11. |
Bar is a unit of |
| A. | pressure |
| B. | force |
| C. | energy |
| D. | frequency |
| Answer» B. force | |
| 12. |
What is the elements present in urea |
| A. | C, H, O |
| B. | C, N, O |
| C. | C,N,H |
| D. | C, O, N, H |
| Answer» E. | |
| 13. |
An element X forms an oxide XO3 What is the valency of X ? |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 6 |
| Answer» E. | |
| 14. |
Sodium carbonate crystals lose water molecules. This property is called |
| A. | hygroscopy |
| B. | deliquescence |
| C. | efflorescence |
| D. | none of these |
| Answer» D. none of these | |
| 15. |
Which of the following chemicals is used in foam fire extinguishers? |
| A. | Aluminium sulphate |
| B. | Copper sulphate |
| C. | Cobalt sulphate |
| D. | Nickel sulphate |
| Answer» B. Copper sulphate | |
| 16. |
The substances that are composed of two or more different elements in fixed proportion by mass are called |
| A. | mixture |
| B. | compound |
| C. | element |
| D. | none of these |
| Answer» C. element | |
| 17. |
Milk is a |
| A. | mixture |
| B. | element |
| C. | metal |
| D. | none of these |
| Answer» B. element | |
| 18. |
The law of constant proportions was enunciated by |
| A. | Dalton |
| B. | Berthelot |
| C. | Avogadro |
| D. | Proust |
| Answer» E. | |
| 19. |
Which one is not metal |
| A. | Sulpher |
| B. | Sugar |
| C. | Zinc |
| D. | Copper |
| Answer» B. Sugar | |
| 20. |
Antimony is |
| A. | metal |
| B. | non metal |
| C. | metalloid |
| D. | none of these |
| Answer» D. none of these | |
| 21. |
The most abundant metal in earth crust is |
| A. | iron |
| B. | magnesium |
| C. | calcium |
| D. | aluminium |
| Answer» E. | |
| 22. |
Which one of the following is not an element |
| A. | Oxygen |
| B. | Hydrogen |
| C. | Silica |
| D. | Nitrogen |
| Answer» D. Nitrogen | |
| 23. |
Consider the following elements1. Copper2. Gold3. Platinum4. SilverWhich of the above elements exists free in nature ? |
| A. | 1 and 2 |
| B. | 2 and 3 |
| C. | 1, 2 and 4 |
| D. | 3 and 4 |
| Answer» C. 1, 2 and 4 | |
| 24. |
Consider the following statements. Equivalent weight of the compound is the weight of it that combines with or displaces directly1. 1.008 part by weight of hydrogen2. 16 parts by weight of nitrogen3. 35.45 part by weight of chlorineWhich of the statements given above are correct ? |
| A. | 1, 2 and 3 |
| B. | 1 and 2 |
| C. | 2 and 3 |
| D. | 1 and 3 |
| Answer» E. | |
| 25. |
What is the composition of nitrolim - a chemical fertilizer? |
| A. | Nitrogen and limestone |
| B. | Calcium carbide and nitrogen |
| C. | Calcium carbide and carbon |
| D. | None of these |
| Answer» E. | |
| 26. |
Which one of the following glasses is used in bullet proof screens? |
| A. | Soda glass |
| B. | Pyrex glass |
| C. | Jena glass |
| D. | Reinforced glass |
| Answer» E. | |
| 27. |
Among the given nutrients, Milk is a poor source of |
| A. | calcium |
| B. | Protein |
| C. | carbohydrate |
| D. | vitamin C |
| E. | .. |
| Answer» E. .. | |
| 28. |
Which one of the following substance does not have a melting point? |
| A. | bromine |
| B. | sodium chloride |
| C. | mercury |
| D. | glass |
| Answer» E. | |
| 29. |
How many electrons are there in Na+ |
| A. | 1 |
| B. | 10 |
| C. | 11 |
| D. | 12 |
| Answer» C. 11 | |
| 30. |
Which of the following is a mixture ? |
| A. | Distilled water |
| B. | Gasoline |
| C. | Liquified petroleum |
| D. | Both (b), (c) |
| Answer» E. | |
| 31. |
A mixture of sand and naphthalene can be separated by |
| A. | fractional distillation |
| B. | sublimation |
| C. | chromatography |
| D. | any of them |
| Answer» C. chromatography | |
| 32. |
Which one of the following is not a mixture |
| A. | Air |
| B. | Mercury |
| C. | Milk |
| D. | Cement |
| Answer» C. Milk | |
| 33. |
Which one among the following is the heaviest ? |
| A. | 1 mole of water molecules |
| B. | 1 mole of ammonia molecules |
| C. | 1 mole of sodium atoms |
| D. | 1 mole of hydrogen molecules |
| Answer» D. 1 mole of hydrogen molecules | |
| 34. |
How many moles are there is 140 g Si (atomic mass of silicon is 28) ? |
| A. | 5 |
| B. | 10 |
| C. | 28 |
| D. | 140 |
| Answer» B. 10 | |
| 35. |
What is the number of P atoms in one mole of P4 |
| A. | 1.504 x 10 |
| B. | 6.023 x 10 |
| C. | 1.209 x 10 |
| D. | 2.409 x 10 |
| Answer» E. | |
| 36. |
In known elements, the maximum number is of |
| A. | metals |
| B. | non-metals |
| C. | metalloids |
| D. | none of these |
| Answer» B. non-metals | |
| 37. |
A gas is found to have the formula (CO)n. Its vapor density is 70. The value of n must be |
| A. | 5 |
| B. | 4 |
| C. | 9 |
| D. | 6 |
| Answer» B. 4 | |
| 38. |
Which one of the following mixture is homogeneous ? |
| A. | Starch and sugar |
| B. | Methanol and water |
| C. | Graphite and charcoal |
| D. | Calcium carbonate and calcium bicarbonate |
| Answer» C. Graphite and charcoal | |
| 39. |
Which one of the following laws directly explains the law of conservation of mass ? |
| A. | Hund's law |
| B. | Dalton's law |
| C. | Avogadro's law |
| D. | Berzelius hypothesis |
| Answer» D. Berzelius hypothesis | |
| 40. |
The M.K.S system was first introduced by |
| A. | Archimedes |
| B. | Eienstein |
| C. | Newton |
| D. | Giorgi |
| Answer» E. | |
| 41. |
The best standard of atomic mass is |
| A. | carbon - 12 |
| B. | oxygen - 16 |
| C. | hydrogen - 1.008 |
| D. | chlorine - 35.5 |
| Answer» B. oxygen - 16 | |
| 42. |
Oxygen and Ozone are |
| A. | allotropes |
| B. | isomers |
| C. | isotopes |
| D. | isobars |
| Answer» B. isomers | |
| 43. |
Which of the following is an element ? |
| A. | Alumina |
| B. | Brass |
| C. | Graphite |
| D. | Silicon |
| Answer» E. | |
| 44. |
A pure substance can only be |
| A. | compound |
| B. | an element |
| C. | an element or a compound |
| D. | a heterogeneous mixture |
| Answer» D. a heterogeneous mixture | |
| 45. |
The credit for the discovery of transoceanic element goes to |
| A. | Hahn |
| B. | Rutherford |
| C. | Seaborg |
| D. | Curie |
| Answer» D. Curie | |
| 46. |
What is iodised table salt ? |
| A. | An element |
| B. | A compound |
| C. | A heterogeneous mixture |
| D. | A homogeneous mixture |
| Answer» E. | |
| 47. |
Which fertilizer is assimilated directly by the plant ? |
| A. | Super phosphate |
| B. | Nitrolim |
| C. | Muriate of Potash |
| D. | Humus |
| Answer» D. Humus | |
| 48. |
An alloy is |
| A. | a compound |
| B. | an allotropic form |
| C. | an isomer |
| D. | a mixture |
| Answer» E. | |
| 49. |
The substances that are composed of two or more different elements in |
| A. | mixture |
| B. | compound |
| C. | element |
| D. | none of these |
| Answer» C. element | |
| 50. |
Antimony |
| A. | metal |
| B. | non metal |
| C. | metalloid |
| D. | none of these |
| Answer» D. none of these | |