This quiz works best with JavaScript enabled. Home > Cbse > Class 7 > Science > Acids > Class 7 Science Chapter 4 Acids – Quiz 18 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 7 Science Chapter 4 Acids Quiz 18 (58 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. FORMIC ACID IS FOUND IN A) CURD. B) VINEGAR. C) ANT'S STING. D) AMLA. Show Answer Correct Answer: C) ANT'S STING. 2. Litmus changes to the colour ..... in the presence of an acid. A) Blue. B) Yellow. C) Green. D) Red. Show Answer Correct Answer: D) Red. 3. Proteins are made up of a combination of how many unique amino acids? A) 10. B) 50. C) 20. D) 25. Show Answer Correct Answer: C) 20. 4. Use your CODON CHART to answer the following question.What amino acid is codded for by the codon GCA? A) Alanine. B) Serine. C) Arginine. D) Proline. Show Answer Correct Answer: A) Alanine. 5. SODIUM HYDROXIDE TURNS BLUE LITMUS PAPER RED A) TRUE. B) FALSE. C) All the above. D) None of the above. Show Answer Correct Answer: B) FALSE. 6. What happens when an acid reacts with a metal? A) It forms a salt and water. B) It forms a salt and hydrogen gas. C) It forms a base and water. D) It forms a base and hydrogen gas. Show Answer Correct Answer: B) It forms a salt and hydrogen gas. 7. What is the name of HI? A) Iodic acid. B) Iodous acid. C) Hydroiodic acid. D) Hypoiodous acid. Show Answer Correct Answer: C) Hydroiodic acid. 8. Which property do acids have? A) Sour taste. B) Bitter button. C) Slippery. D) None of the above. Show Answer Correct Answer: A) Sour taste. 9. HCl + LiOH $\rightarrow$ LiCl + H$_{2}$OIn the reaction represented by the equation above, which chemical acts as the acid? A) LiCl. B) Any otheruce. C) H$_{2}$O. D) HCl. Show Answer Correct Answer: D) HCl. 10. Which acid is used to preserve food materials? A) Carbonic acid. B) Benzoic acid. C) Hydrochloric acid. D) Sulphuric acid. Show Answer Correct Answer: B) Benzoic acid. 11. Plaster of pairs is made from- A) Slaked lime. B) Gypsum. C) Lime stone. D) Quick lime. Show Answer Correct Answer: B) Gypsum. 12. Given the following sequence of mRNA, what series of amino acids are coded for?mRNA:CUCAAGUGCUUC A) Leu-Lys-Cys-Phe. B) Val-Asp-Pro-His. C) Ser-Tyr-Arg-Gly. D) Pro-GLU-Leu-Val. Show Answer Correct Answer: A) Leu-Lys-Cys-Phe. 13. What is the characteristic functional group of carboxylic acids? A) Carbon. B) Carbonyl. C) Carboxyl. D) Hydroxyl. Show Answer Correct Answer: C) Carboxyl. 14. The repeating units of protein are A) Amino acids. B) Fatty acid. C) Glucose. D) Peptides. Show Answer Correct Answer: A) Amino acids. 15. Substance that is neither acidic nor basic it is said to be ..... A) Acidic. B) Basic. C) Neutral. D) None of the above. Show Answer Correct Answer: C) Neutral. 16. Lemon juice can be used to neutralize a basic solution. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 17. You should not store acids in ..... A) Plastic containers. B) Metallic containers. C) All the above. D) None of the above. Show Answer Correct Answer: B) Metallic containers. 18. Ammonia has a pH of 12. Ammonia is ..... A) A base. B) An acid. C) A metal. D) An element. Show Answer Correct Answer: A) A base. 19. A glowing splint placed in oxygen gas will A) Do nothing. B) Cause a squeaky pop. C) Relight. D) Get wet. Show Answer Correct Answer: C) Relight. 20. Which gas is liberated when Sodium hydrogen carbonate reacts with an acid? A) Hydrogen. B) Sulphur dioxide. C) Nitrogen dioxide. D) Carbondioxide. Show Answer Correct Answer: D) Carbondioxide. 21. Which one of the following is an example of a base? A) Vinegar. B) Lemons. C) Orange juice. D) Dish soap. Show Answer Correct Answer: D) Dish soap. 22. Sodium hypochlorite (NaOCl) is a A) Strong Acid. B) Weak Acid. C) Weak Base. D) Strong base. Show Answer Correct Answer: C) Weak Base. 23. The following are the best ..... A) Hydrogen. B) Detergent powder. C) Bleaching powder. D) Carbon. Show Answer Correct Answer: C) Bleaching powder. 24. True or False. Electrolytes e.g. NaCl ionize when dissolved in water, separating into positive and negative ions (charged particles) e.g. Na$^{+}$ and Cl$^{-}$ A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 25. What is the suffix for carboxylic acids? A) -ic acid. B) -oic acid. C) -oic. D) None of the above. Show Answer Correct Answer: B) -oic acid. 26. Litmus is obtained from ..... A) Lichens. B) Acids. C) Neutrals. D) None of these. Show Answer Correct Answer: A) Lichens. 27. Blue litmus paper is held in dry HCl fume, A) No change. B) Turn to red. C) Turn to green. D) Turn to blue. Show Answer Correct Answer: A) No change. 28. Hydrochloric acid is commonly found in gastric juice. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 29. A substance that is a 10 on the pH scale would be a(n) ..... A) Base. B) Acid. C) Neutral. D) Indicator. Show Answer Correct Answer: A) Base. 30. Which of the following statements is most likely to be true of non-polar R groups in aqueous solution? A) They are hydrophillic and found buried within proteins. B) They are hydrophillic and found on protein surfaces. C) They are hydrophobic and found within proteins. D) They are hydrophobic and found on protein surfaces. Show Answer Correct Answer: C) They are hydrophobic and found within proteins. 31. What is the name HC$_{2}$H$_{3}$O$_{2}$? A) Hydroacetic acid. B) Acetous Acid. C) Acetate. D) Acetic Acid. Show Answer Correct Answer: D) Acetic Acid. 32. Name this acid. HClO$_{4}$ A) Perchloric acid. B) Hypochlorous acid. C) Chloric acid. D) Hydrochloric acid. Show Answer Correct Answer: A) Perchloric acid. 33. What is the amino acid which contains 2 carboxylic groups? A) Alanine (a)-way. B) Aspartate (D)-Asp. C) Serine (s)-Being. D) Tyrosine (Y)-Tyr. Show Answer Correct Answer: B) Aspartate (D)-Asp. 34. When coiled together, DNA looks like a: A) Single Helix. B) Triple Helix. C) Broken Ladder. D) Double Helix. Show Answer Correct Answer: D) Double Helix. 35. The pH of a substance that is slightly alkaline could be A) 1. B) 9. C) 5. D) 11. Show Answer Correct Answer: B) 9. 36. A solution with a pH value of 9 is considered? A) Salty. B) Neutral. C) Basic. D) Acidic. Show Answer Correct Answer: C) Basic. 37. Which of the following substances is alkaline A) Dishwashing liquid. B) Milk. C) Vinegar. D) Distilled water. Show Answer Correct Answer: A) Dishwashing liquid. 38. Cabbage juice changes color in the presence of other chemicals, and the color it changes depends on the other chemical's pH. We can classify cabbage juice as a(n) ..... A) Indicator. B) Chameleon. C) Reactant. D) Product. Show Answer Correct Answer: A) Indicator. 39. Ethylammonium chloride (CH$_{3}$CH$_{2}$NH$_{3}$Cl) is a A) Weak Base. B) Strong Acid. C) Weak Acid. D) Strong base. Show Answer Correct Answer: C) Weak Acid. 40. What type of acid is in inside of our stomach? A) Citric acid. B) Lactic acid. C) Hydrochloric acid. D) Sulpheric acid. Show Answer Correct Answer: C) Hydrochloric acid. 41. What anion would you find in acetic acid? A) HCO$_{3}$$^{-}$. B) C$_{2}$H$_{3}$O$_{2}$$^{-}$. C) H$^{+}$. D) O$^{-2}$. Show Answer Correct Answer: B) C$_{2}$H$_{3}$O$_{2}$$^{-}$. 42. Which of the following feel soapy on touching? A) Acid. B) Base. C) Salt. D) None of these. Show Answer Correct Answer: B) Base. 43. When naming acids with poly-atomic ions, change "-ite" to: A) -ite. B) -ate. C) -ous. D) -ic. Show Answer Correct Answer: C) -ous. 44. If you have 40 adenine in a DNA molecule, how many thymine can you expect? A) 30. B) 40. C) 20. D) 50. Show Answer Correct Answer: B) 40. 45. Hydrochloric acid (a) A) HClO$_{2}$. B) Hclo $ _ {4} $. C) HCLO $ _ {3} $. D) A. HCl. Show Answer Correct Answer: D) A. HCl. 46. Adenine pairs with A) Thymine only. B) Uracil only. C) Thymine and Uracil. D) Guanine. Show Answer Correct Answer: C) Thymine and Uracil. 47. How would you classify a substance that brightly lights a light bulb and dissociates completely? A) Strong acid/base. B) Weak acid/base. C) Neutral substance. D) Metalloid. Show Answer Correct Answer: A) Strong acid/base. 48. A substance with a pH of 5 is which of the following? A) Acid. B) Base. C) Neutral. D) None of the above. Show Answer Correct Answer: A) Acid. 49. Bases have a pH of A) 7. B) Less than 7. C) More than 7. D) None of the above. Show Answer Correct Answer: C) More than 7. 50. You can eat or drink a base. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 51. Litmus has a ..... colour when mixed with distilled water. A) Blue. B) Mauve. C) Yellow. D) Green. Show Answer Correct Answer: B) Mauve. 52. Deoxyribose sugar is present in A) DNA only. B) RNA only. C) DNA and RNA. D) T-RNA. Show Answer Correct Answer: A) DNA only. 53. The acid changes the color of blue litmus to ..... A) Acid. B) Red. C) Base. D) Pink. Show Answer Correct Answer: B) Red. 54. Which is known as caustic soda? A) Sodium bicarbonate. B) Sodium chloride. C) Potassium hydroxide. D) Sodium hydroxide. Show Answer Correct Answer: D) Sodium hydroxide. 55. ..... is generally an ionic compound that produces hydroxide ions when dissolved in water. A) An acid. B) A base. C) A salt. D) None of the above. Show Answer Correct Answer: B) A base. 56. Acid in our stomach: A) Acetic acid. B) Sulfuric acid. C) Carbonic acid. D) Hydrochloric acid. Show Answer Correct Answer: D) Hydrochloric acid. 57. A student detected the pH of four unknown solutions A, B, C and D as follows:11, 5, 7 and 2. Predict the nature of these solutions. Which one is neutral solution A) B. B) A. C) C. D) D. Show Answer Correct Answer: C) C. 58. When found in food, acids are ..... A) Sour. B) Slippery. C) Salty. D) Bitter. Show Answer Correct Answer: A) Sour. ← PreviousRelated QuizzesScience QuizzesClass 7 QuizzesClass 7 Science Chapter 4 Acids Quiz 1Class 7 Science Chapter 4 Acids Quiz 2Class 7 Science Chapter 4 Acids Quiz 3Class 7 Science Chapter 4 Acids Quiz 4Class 7 Science Chapter 4 Acids Quiz 5Class 7 Science Chapter 4 Acids Quiz 6Class 7 Science Chapter 4 Acids Quiz 7Class 7 Science Chapter 4 Acids Quiz 8 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books