TNPSC Group 4 - Elements and compounds acids bases salts petroleum products fertilizers pesticides metallurgy and food adulterants. Online Test (MCQ Quiz)

1. Which of the following is a noble gas?

A) Oxygen B) Nitrogen C) Helium D) Hydrogen

2. What is the chemical symbol for gold?

A) Ag B) Au C) Fe D) Cu

3. Which of the following is a strong acid?

A) Acetic acid B) Carbonic acid C) Hydrochloric acid D) Citric acid

4. What is the pH of a neutral solution?

A) 0 B) 7 C) 14 D) 1

5. Which of the following is a common household base?

A) Vinegar B) Lemon juice C) Baking soda D) Distilled water

6. What is the main component of natural gas?

A) Ethane B) Propane C) Methane D) Butane

7. Which petroleum product is primarily used as fuel for jet engines?

A) Gasoline B) Kerosene C) Diesel D) Lubricating oil

8. What is the primary nutrient in urea, a common fertilizer?

A) Phosphorus B) Potassium C) Nitrogen D) Sulfur

9. Which of the following is a widely used insecticide?

A) Potash B) DDT C) Superphosphate D) Ammonia

10. What is the process of extracting a metal from its ore called?

A) Refining B) Smelting C) Electrolysis D) Metallurgy

11. Which metal is extracted from bauxite ore?

A) Iron B) Copper C) Aluminum D) Zinc

12. What is the common adulterant found in milk?

A) Starch B) Water C) Formaldehyde D) Urea

13. Which element is essential for the formation of hemoglobin in red blood cells?

A) Calcium B) Iron C) Magnesium D) Potassium

14. What is the chemical formula for common salt?

A) KOH B) H2SO4 C) NaCl D) CaCO3

15. Which type of compound typically turns red litmus paper blue?

A) Acid B) Base C) Salt D) Oxide

16. What is the main use of asphalt, a product of petroleum distillation?

A) Fuel for heating B) Road construction C) Manufacturing plastics D) Lubricant

17. Which fertilizer provides phosphorus to plants?

A) Urea B) Potash C) Superphosphate D) Ammonium nitrate

18. Organophosphates are a class of:

A) Fertilizers B) Herbicides C) Insecticides D) Fungicides

19. What is the primary ore of iron?

A) Bauxite B) Haematite C) Chalcopyrite D) Galena

20. Which process is used to purify impure metals by melting them and allowing them to solidify?

A) Distillation B) Filtration C) Crystallization D) Zone refining

21. The adulteration of turmeric powder with which substance is common?

A) Metanil yellow B) Lead chromate C) Starch D) Carbon black

22. Which of the following is a non-metal that is a liquid at room temperature?

A) Mercury B) Bromine C) Iodine D) Sulfur

23. What is formed when an acid reacts with a base?

A) Water and a salt B) Only water C) Only a salt D) An oxide

24. Which gas is produced during the fractional distillation of petroleum and used as LPG?

A) Methane B) Ethane C) Propane and Butane D) Pentane

25. What is the main purpose of adding fertilizers to soil?

A) To increase soil acidity B) To improve soil structure C) To provide essential nutrients for plant growth D) To kill harmful microorganisms

26. Which of the following is a selective herbicide, meaning it targets specific weeds?

A) Paraquat B) Glyphosate C) 2,4-D D) Atrazine

27. The process of converting iron ore into iron is called:

A) Roasting B) Calcination C) Smelting D) Bessemerization

28. Which method is used to extract highly reactive metals like sodium from their molten salts?

A) Smelting B) Electrolysis C) Reduction with carbon D) Displacement

29. Adulteration of chili powder with brick dust is done to:

A) Increase spiciness B) Improve color C) Increase weight and volume D) Add nutritional value

30. Which element is the most abundant in the Earth's crust?

A) Silicon B) Aluminum C) Oxygen D) Iron

31. What is the chemical formula for sulfuric acid?

A) HNO3 B) HCl C) H2SO4 D) H3PO4

32. Which term describes a substance that can neutralize an acid?

A) Indicator B) Solvent C) Base D) Catalyst

33. What is the main component of LPG (Liquefied Petroleum Gas)?

A) Methane and ethane B) Propane and butane C) Ethylene and acetylene D) Benzene and toluene

34. Which element is a primary macronutrient for plants, crucial for photosynthesis?

A) Potassium B) Phosphorus C) Nitrogen D) Calcium

35. DDT (Dichloro-diphenyl-trichloroethane) is a pesticide that has been banned in many countries due to its:

A) Rapid biodegradability B) Low toxicity to non-target organisms C) Persistence and bioaccumulation D) High solubility in water

36. Which metal is extracted from the ore galena?

A) Copper B) Lead C) Zinc D) Tin

37. The Bessemer process is used for the production of:

A) Aluminum B) Copper C) Steel D) Zinc

38. Which of the following is a common adulterant in ground spices, used to enhance color?

A) Water B) Sawdust C) Artificial colors like Sudan dyes D) Salt

39. What is the chemical symbol for iron?

A) Ir B) I C) Fe D) In

40. Which acid is found in vinegar?

A) Formic acid B) Acetic acid C) Citric acid D) Lactic acid

41. A substance that changes color in the presence of an acid or base is called a(n):

A) Catalyst B) Indicator C) Emulsifier D) Stabilizer

42. Which fraction of petroleum is used as fuel for diesel engines?

A) Gasoline B) Kerosene C) Diesel oil D) Lubricating oil

43. Potassium nitrate (KNO3) is a type of fertilizer known as:

A) Nitrogenous fertilizer B) Phosphatic fertilizer C) Potassic fertilizer D) Complex fertilizer

44. Which of the following is a systemic insecticide, absorbed by the plant and toxic to pests that feed on it?

A) Pyrethroids B) Neonicotinoids C) Organochlorines D) Organophosphates

45. What is the main metal present in stainless steel?

A) Copper B) Aluminum C) Iron D) Chromium

46. Which process involves heating an ore in the presence of excess air to convert it into its oxide?

A) Smelting B) Roasting C) Reduction D) Calcination

47. The presence of 'benzoic acid' in food products often indicates:

A) Natural flavoring B) Preservative C) Sweetener D) Thickener

48. Which non-metal is crucial for the formation of all organic compounds?

A) Oxygen B) Nitrogen C) Sulfur D) Carbon

49. What is the chemical formula for calcium carbonate?

A) Ca(OH)2 B) CaO C) CaCO3 D) CaSO4

50. Which of the following is an amphoteric substance, meaning it can act as both an acid and a base?

A) Sodium hydroxide B) Sulfuric acid C) Water D) Ammonia

Elements and compounds acids bases salts petroleum products fertilizers pesticides metallurgy and food adulterants. - Online Test

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