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 elements
|
| 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 directly
|
| 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 | |