MCQOPTIONS
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MCQOPTIONS
This section includes 657 Mcqs, each offering curated multiple-choice questions to sharpen your Testing Subject knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Which of the following has made it possible to get the maximum amount of products? |
| A. | Le Chatellier's principle |
| B. | Charle's law |
| C. | Boyle's law |
| D. | Snell's law |
| Answer» B. Charle's law | |
| 2. |
When [H+] is greater than 1 x 10-7, the solution is |
| A. | neutral |
| B. | acidic |
| C. | basic |
| D. | amphoteric |
| Answer» C. basic | |
| 3. |
What is the effect of acid on blue litmus paper? |
| A. | it remains blue |
| B. | it turns pink |
| C. | it turns red |
| D. | it becomes colorless |
| Answer» D. it becomes colorless | |
| 4. |
NaHSO4 is a/an |
| A. | basic salt |
| B. | common salt |
| C. | acid salt |
| D. | normal salt |
| Answer» D. normal salt | |
| 5. |
Considering Bronsted-Lowery theory, a base is a |
| A. | proton acceptor |
| B. | electron acceptor |
| C. | proton donor |
| D. | electron donor |
| Answer» B. electron acceptor | |
| 6. |
What is the pH of saliva? |
| A. | 6 |
| B. | 7 |
| C. | 8 |
| D. | 9 |
| Answer» B. 7 | |
| 7. |
Organic compounds are |
| A. | non-volatile |
| B. | volatile |
| C. | have high melting point |
| D. | have high boiling point |
| Answer» C. have high melting point | |
| 8. |
Butanone is an example of |
| A. | aldehydes |
| B. | ketones |
| C. | carboxylic acids |
| D. | ethers |
| Answer» C. carboxylic acids | |
| 9. |
If one hydrogen atom (H) of alkane (saturated hydrocarbon) is substituted by one halogen atom (F, Cl, Br, I), the compound formed is |
| A. | alkene |
| B. | alkyne |
| C. | halo alkane |
| D. | alkaline |
| Answer» D. alkaline | |
| 10. |
How many bonds are formed by carbon with other atoms? |
| A. | two |
| B. | three |
| C. | four |
| D. | five |
| Answer» D. five | |
| 11. |
Nature of organic compounds is |
| A. | ionic |
| B. | amphoteric |
| C. | covalent |
| D. | coordinate covalent |
| Answer» D. coordinate covalent | |
| 12. |
The state at which forward and reverse reactions occur at the same rate is |
| A. | equilibrium |
| B. | unstable equilibrium |
| C. | not in equilibrium |
| D. | neutral equilibrium |
| Answer» B. unstable equilibrium | |
| 13. |
When diluting acid always add |
| A. | water to acid |
| B. | acid to water |
| C. | acid to oxygen |
| D. | hydrogen to acid |
| Answer» C. acid to oxygen | |
| 14. |
The equilibrium constant can be used to determine the equilibrium concentration of equilibrium mixture knowing the |
| A. | final concentration of products |
| B. | final concentration of reactants |
| C. | initial concentration of reactants |
| D. | initial concentration of products |
| Answer» D. initial concentration of products | |
| 15. |
The term "active mass" shows the concentration of reactants and products in |
| A. | mol.dm-3 for a dilute solution |
| B. | mol.cm-3 for a dilute solution |
| C. | mol.dm-3 for a concentrated solution |
| D. | mol.cm-3 for a concentrated solution |
| Answer» B. mol.cm-3 for a dilute solution | |
| 16. |
The relationship by which the values that relate amounts of products to reactants at equilibrium can be determined is called |
| A. | law of conservation of mass |
| B. | law of chemical reactions |
| C. | law of mass action |
| D. | active mass |
| Answer» D. active mass | |
| 17. |
Which of the following is used as an antacid and laxative? |
| A. | sodium hydroxide |
| B. | potassium hydroxide |
| C. | calcium hydroxide |
| D. | magnesium hydroxide |
| Answer» E. | |
| 18. |
At pH6, Methyl red changes color from red to |
| A. | pink |
| B. | blue |
| C. | yellow |
| D. | orange |
| Answer» D. orange | |
| 19. |
What is the pH at which Bromothymol blue changes color? |
| A. | 5.5 |
| B. | 7 |
| C. | 9 |
| D. | 10 |
| Answer» C. 9 | |
| 20. |
When [H+] is equal to 1 x 10-7, the solution is |
| A. | neutral |
| B. | acidic |
| C. | basic |
| D. | amphoteric |
| Answer» B. acidic | |
| 21. |
What is the color of methyl orange in the HCl solution? |
| A. | red |
| B. | yellow |
| C. | blue |
| D. | pink |
| Answer» B. yellow | |
| 22. |
The compound which is responsible for acid rain is |
| A. | sulfur |
| B. | sulfur dioxide |
| C. | sulfur trioxide |
| D. | nitrogen |
| Answer» D. nitrogen | |
| 23. |
What is represented by each figure within a square bracket in the equilibrium expression? |
| A. | concentration in mol.dm-3 |
| B. | volume of products |
| C. | mass of products |
| D. | mass of reactants |
| Answer» B. volume of products | |
| 24. |
Percentage of nitrogen in the air is |
| A. | 0.78 |
| B. | 0.21 |
| C. | 0.0093 |
| D. | 0.0004 |
| Answer» B. 0.21 | |
| 25. |
The temperature of the thermosphere is up to |
| A. | 120 °C |
| B. | 1200 °C |
| C. | 1800 °C |
| D. | 1000 °C |
| Answer» D. 1000 °C | |
| 26. |
The gas responsible for global warming is |
| A. | oxygen |
| B. | carbon dioxide |
| C. | carbon monoxide |
| D. | oxygen |
| Answer» C. carbon monoxide | |
| 27. |
When ozone absorbs UV radiation, the energy is converted in to |
| A. | light |
| B. | sound |
| C. | heat |
| D. | electricity |
| Answer» D. electricity | |
| 28. |
Percentage of oxygen in the air is |
| A. | 0.78 |
| B. | 0.21 |
| C. | 0.0093 |
| D. | 0.0004 |
| Answer» C. 0.0093 | |
| 29. |
Percentage of helium in the air is |
| A. | 0.000624 |
| B. | 0.000524 |
| C. | 0.000724 |
| D. | 0.000824 |
| Answer» C. 0.000724 | |
| 30. |
Percentage of carbon dioxide in the air is |
| A. | 0.78 |
| B. | 0.21 |
| C. | 0.0093 |
| D. | 0.0004 |
| Answer» E. | |
| 31. |
The amount of Nitrogen (N2) present in dry air is |
| A. | 0.2 |
| B. | 0.78 |
| C. | 0.48 |
| D. | 0.68 |
| Answer» C. 0.48 | |
| 32. |
The maximum amount of ozone (O3) is present in |
| A. | troposphere |
| B. | stratosphere |
| C. | mesosphere |
| D. | thermosphere |
| Answer» C. mesosphere | |
| 33. |
The mass of atmosphere contained in the troposphere is about |
| A. | 10-20% |
| B. | 75-80% |
| C. | 90-100% |
| D. | 50-60% |
| Answer» C. 90-100% | |
| 34. |
Ozone (O?) comprises of |
| A. | one oxygen atom |
| B. | 2 oxygen atoms |
| C. | 3 oxygen atoms |
| D. | 4 oxygen atoms |
| Answer» D. 4 oxygen atoms | |
| 35. |
The reformation of ozone in the stratosphere is powered by |
| A. | ultraviolet radiation |
| B. | atmospheric oxygen |
| C. | sunlight |
| D. | heat |
| Answer» B. atmospheric oxygen | |
| 36. |
Ozone gas (O3) has |
| A. | unpleasant odor |
| B. | pleasant odor |
| C. | no odor |
| D. | orange color |
| Answer» B. pleasant odor | |
| 37. |
The atmospheric layer closest to the earth's surface is |
| A. | troposphere |
| B. | mesosphere |
| C. | stratosphere |
| D. | thermosphere |
| Answer» B. mesosphere | |
| 38. |
The atmosphere consists of |
| A. | gases only |
| B. | water vapors only |
| C. | chemicals |
| D. | gases and water vapors |
| Answer» E. | |
| 39. |
What is the pH of water? |
| A. | 4 |
| B. | 5 |
| C. | 6 |
| D. | 7 |
| Answer» E. | |
| 40. |
Which theory was proposed to overcome the shortcomings of the Arrhenius theory? |
| A. | Bronsted-Lowery theory |
| B. | Lewis theory |
| C. | Bohr atomic theory |
| D. | Dalton's theory |
| Answer» B. Lewis theory | |
| 41. |
What is the color of methyl orange in lemon juice? |
| A. | red |
| B. | yellow |
| C. | blue |
| D. | pink |
| Answer» B. yellow | |
| 42. |
Which of the following is used in the manufacture of many chemicals, drugs, dyes, paints, and explosives? |
| A. | hydrochloric acid |
| B. | nitric acid |
| C. | sulphuric acid |
| D. | phosphoric acid |
| Answer» D. phosphoric acid | |
| 43. |
Partial neutralization of Carbonic acid forms |
| A. | carbon dioxide |
| B. | hydrogen carbonate |
| C. | carbonate |
| D. | carbon monoxide |
| Answer» C. carbonate | |
| 44. |
The strands of DNA are held together by |
| A. | covalent bond |
| B. | ionic bond |
| C. | hydrogen bond |
| D. | dipole dipole interaction |
| Answer» D. dipole dipole interaction | |
| 45. |
Considering the structure of DNA, the two strands twisted around each other in a spiral formation are called |
| A. | single helix |
| B. | double helix |
| C. | triple helix |
| D. | tetra helix |
| Answer» C. triple helix | |
| 46. |
Which of the following is oligosaccharide? |
| A. | glucose |
| B. | fructose |
| C. | maltose |
| D. | galactose |
| Answer» D. galactose | |
| 47. |
Which of the following is a pentahydroxy ketone? |
| A. | glucose |
| B. | fructose |
| C. | sucrose |
| D. | starch |
| Answer» C. sucrose | |
| 48. |
How many amino acids are not synthesized by our bodies? |
| A. | 40 |
| B. | 30 |
| C. | 20 |
| D. | 10 |
| Answer» E. | |
| 49. |
Complete neutralization of Carbonic acid forms |
| A. | carbon dioxide |
| B. | hydrogen carbonate |
| C. | carbonate |
| D. | carbon monoxide |
| Answer» D. carbon monoxide | |
| 50. |
What is the experimentally determined concentration of OH- ions at 25 degrees Celsius? |
| A. | 1 x 10-2 |
| B. | 1 x 10-4 |
| C. | 1 x 10-7 |
| D. | 1 x 10-10 |
| Answer» D. 1 x 10-10 | |