This quiz works best with JavaScript enabled. Home > Cbse > Class 7 > Science > Acids > Class 7 Science Chapter 4 Acids – Quiz 3 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 7 Science Chapter 4 Acids Quiz 3 (60 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. A measure of hydronium ion concentration in a solution A) Balloon size. B) PH. C) Ph. D) Triple beam balance. Show Answer Correct Answer: B) PH. 2. The pH of pure water is A) 7. B) 1. C) 5. D) 11. Show Answer Correct Answer: A) 7. 3. An unknown substance was tested and found to have an extremely high concentration of hydroxide ions, OH$^{-}$. and very low concentration of hydronium ions, H$_{3}$O$^{+}$. Which pH would make the most sense? A) PH = 8. B) PH = 12. C) PH = 6. D) PH = 2. Show Answer Correct Answer: B) PH = 12. 4. The compounds obtained on heating baking soda are A) Sulphur dioxide and sodium carbonate. B) Sodium bicarbonate, water and carbon dioxide. C) Sodium carbonate, water and carbon dioxide. D) Hydrochloric acid and water. Show Answer Correct Answer: C) Sodium carbonate, water and carbon dioxide. 5. ..... is used for white washing A) Potassium hydroxide. B) Calcium carbonate. C) Calcium hydroxide. D) Sodium hydroxide. Show Answer Correct Answer: C) Calcium hydroxide. 6. Colour of blue litmus solution ..... when poured into ammonium hydroxide solution. A) Turns green. B) Turns red. C) Turns yellow. D) Stays the same. Show Answer Correct Answer: D) Stays the same. 7. The reaction between ammonium hydroxide and sulfuric acid is called A) Precipitation. B) Combustion. C) Synthesis. D) Neutralization. Show Answer Correct Answer: D) Neutralization. 8. To protect tooth decay, one is advised to brush the teeth regulary. The ingredient of the paste which checks tooth decay is: A) Neutral. B) Basic. C) Acidic. D) Corrosive. Show Answer Correct Answer: B) Basic. 9. True or false:bases are sometimes called alkaline. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 10. Fruits such as oranges, lemon etc, contain ..... Acid A) Citric. B) Ascorbic. C) Lactic. D) Acetic. Show Answer Correct Answer: A) Citric. 11. The colour of universal indicator in a substance that is very acidic is: A) Red. B) Purple. C) Orange. D) Green. Show Answer Correct Answer: A) Red. 12. Metallic oxides are basic in nature. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 13. Which of the following substances contain an alkali? A) Vinegar. B) Baking powder. C) Coca Cola. D) Distilled water. Show Answer Correct Answer: B) Baking powder. 14. Select the formula for the following acid:chloric acid A) HCLO $ _ {3} $. B) HCl. C) Hclo $ _ {4} $. D) None of the above. Show Answer Correct Answer: A) HCLO $ _ {3} $. 15. Which elements are mostly found in proteins? A) C, H, O, N. B) C, H, O. C) C, H, O, N, P. D) C, H, O, N, S, Ca. Show Answer Correct Answer: A) C, H, O, N. 16. Acids aren't Corrosive. True or False? A) True. B) False. C) I don't know. D) None of the above. Show Answer Correct Answer: B) False. 17. OH$^{-}$ is called the: A) Hydrate ion. B) Hydronium ion. C) Hydrogen ion. D) Hydroxide ion. Show Answer Correct Answer: D) Hydroxide ion. 18. When naming oxyacids, change "-ite" to: A) -ic. B) -ite. C) -ate. D) -ous. Show Answer Correct Answer: D) -ous. 19. Which of the following is not a characteristic of a base? A) Feels slippery. B) Tastes bitter. C) Is an electrolyte. D) Reacts with a metal to form H gas. Show Answer Correct Answer: D) Reacts with a metal to form H gas. 20. Not a acidic salt A) COSO4. B) NH4CL. C) CH3Coon. D) FeCl3. Show Answer Correct Answer: C) CH3Coon. 21. The following is the neutralization process in the following ..... A) Acid + alkali $\rightarrow$ acid-alkaline solution. B) Acid + alkali $\rightarrow$ neutral solution. C) Acid + alkali $\rightarrow$ sodium chloride + hydrogen. D) Acid + alkali $\rightarrow$ salty + water. Show Answer Correct Answer: D) Acid + alkali $\rightarrow$ salty + water. 22. A base is a compound that releases ..... ios when dissolved in water A) OH$^{+}$. B) O$^{-}$. C) O$_{2}$$^{-}$. D) H$^{+}$. Show Answer Correct Answer: A) OH$^{+}$. 23. Universal indicator is added to a solution. The solution turns purple. The solution contains A) Sodium hydroxide solution. B) Citric acid. C) Only water. D) Hydrochloric acid. Show Answer Correct Answer: A) Sodium hydroxide solution. 24. Which of these compounds is the most soluble in water? A) 1, 2-Propanediol. B) Ethanoic acid. C) Propanol. D) Ethanedioc acid. Show Answer Correct Answer: D) Ethanedioc acid. 25. Acid in car battery: A) Carbonic acid. B) Acetic acid. C) Hydrochloric acid. D) Sulfuric acid. Show Answer Correct Answer: D) Sulfuric acid. 26. Which of the following is a strong acid? A) Carbonic acid. B) Hydrochloric acid. C) Lemon juice (citric acid). D) Vinegar (acetic acid). Show Answer Correct Answer: B) Hydrochloric acid. 27. Sodium hydroxide (NaOH) is a A) Weak Acid. B) Strong Acid. C) Weak Base. D) Strong base. Show Answer Correct Answer: D) Strong base. 28. Ammonia is found in many household products, including window cleaner. What is the pH of ammonia? A) It's acidic. B) It's basic. C) It's neutral. D) None of the above. Show Answer Correct Answer: B) It's basic. 29. Acid present in lemon orange A) Oxalic acid. B) Citric acid. C) Malic acid. D) Lactic acid. Show Answer Correct Answer: B) Citric acid. 30. Medicines used for treatment of indigestion A) Antiseptic. B) Antacid. C) Antibiotic. D) Analgesic. Show Answer Correct Answer: B) Antacid. 31. Value of water of water ..... CAL/GM A) 100. B) 720. C) 80. D) 540. Show Answer Correct Answer: D) 540. 32. What is the formula for Sulfurous Acid? A) H$_{2}$SO$_{4}$. B) HSO $ _ {3} $. C) H$_{2}$SO$_{3}$. D) SO$_{3}$. Show Answer Correct Answer: C) H$_{2}$SO$_{3}$. 33. Which is false regarding RNA? A) RNA is a single polynucleotide. B) There are three types of RNA which are mRNA, rRNA, tRNA. C) RNA is longer compared to DNA. D) Thymine in DNA is replaced by uracil in RNA. Show Answer Correct Answer: C) RNA is longer compared to DNA. 34. Which of the following would be classified as an acid according to the Arrhenius definition? A) CA (OH) 2. B) Hakka. C) NaCl. D) Ancient. Show Answer Correct Answer: B) Hakka. 35. Soap is slippery and bitter to the taste. From this description, we can conclude that it is most likely a(n) ..... A) Acid. B) Base. C) All the above. D) None of the above. Show Answer Correct Answer: B) Base. 36. Changes the color of indicators. A) Acids. B) Bases. C) All. D) None of the above. Show Answer Correct Answer: C) All. 37. H$_{2}$C$_{2}$O$_{4}$ A) Carbonic acid. B) Oxalic acid. C) Chromic acid. D) Chloric acid. Show Answer Correct Answer: B) Oxalic acid. 38. China rose indicator turns ..... when added to lemon juice. A) Green. B) Pink. C) Yellow. D) Brown. Show Answer Correct Answer: B) Pink. 39. Tannic acid is found in ..... A) Tears. B) Tea. C) Tomatoes. D) None of the above. Show Answer Correct Answer: B) Tea. 40. A hydrogen ion, H$^{+}$, is the same as a(n): A) Proton. B) Electron. C) Neutron. D) Hydroxide ion. Show Answer Correct Answer: A) Proton. 41. Which of the following pH numbers indicates a neutral substance? A) 7. B) 1. C) 13. D) 5. Show Answer Correct Answer: A) 7. 42. If the substance is neutral, what would the pH be?11 A) 3. B) 11. C) 7. D) 5. E) 9. Show Answer Correct Answer: C) 7. 43. If the soil is acidic what we should do to make it neutral A) Add salt. B) Add acid. C) Add base. D) Add sugar. Show Answer Correct Answer: C) Add base. 44. All molecular formula below are carboxylic acid, except A) COOH-CH$_{3}$-COOH. B) C$_{6}$H$_{14}$O$_{2}$. C) C$_{5}$H$_{10}$O$_{2}$. D) COOHC$_{2}$H$_{5}$. E) CH$_{3}$COOH. Show Answer Correct Answer: B) C$_{6}$H$_{14}$O$_{2}$. 45. What is used to neutralize acidity in soil A) Sodium hydroxide. B) Acetic acid. C) Magnesium hydroxide. D) Calcium hydroxide. Show Answer Correct Answer: D) Calcium hydroxide. 46. Adenine, Thymine, Guanine and Cytosine are what? A) Sugars. B) Bases. C) Phosphates. D) Nucleotides. Show Answer Correct Answer: B) Bases. 47. Is the following compound an acid or a base? Ca(OH)$_{2}$ A) Acid. B) Base. C) All the above. D) None of the above. Show Answer Correct Answer: B) Base. 48. Acids are found on the pH scale between which numbers? A) 19-42. B) 0-7. C) 7. D) 7-14. Show Answer Correct Answer: B) 0-7. 49. Which of the following is NOT a characteristic of an acid? A) Neutralises bases. B) Corrosive. C) Sour taste. D) Turns litmus paper blue. Show Answer Correct Answer: D) Turns litmus paper blue. 50. Which of the following statements about acids is true? A) They taste sweet. B) They taste sour. C) They have a pH between 8-14. D) None of the above. Show Answer Correct Answer: B) They taste sour. 51. What is the function of mRNA? A) To get message from DNA. B) The find correct amino acid. C) To help attach codons and anti-codons at ribosome. D) Make DNA. Show Answer Correct Answer: A) To get message from DNA. 52. What type of reaction is the following:HCl + Zn $\rightarrow$ ZnCl$_{2}$ + H$_{2}$ A) Neutralization. B) Acid and a metal. C) Acid and a carbonate. D) Ionic. Show Answer Correct Answer: B) Acid and a metal. 53. Which of the following contains Malic Acid? A) Apple. B) Milk. C) Lactic. D) Grapes. E) Oranges. Show Answer Correct Answer: A) Apple. 54. Which of the following substances contain acid? A) Washing powder. B) An orange. C) Distilled water. D) Bleach. Show Answer Correct Answer: B) An orange. 55. What other laboratory substance can you use to test if colourless substance is an acid or an alkali? A) Catalyst. B) Salt. C) Universal Indicator. D) Water. Show Answer Correct Answer: C) Universal Indicator. 56. According to Bronsted-Lowry, what does an acid do? A) It produces OH$^{-}$ in water. B) It donates a proton (H$^{+}$). C) It accepts a proton (H$^{+}$). D) It produces H$^{+}$ in water. Show Answer Correct Answer: B) It donates a proton (H$^{+}$). 57. What is the formula for hydrofluoric acid? A) HF. B) HFO$_{3}$. C) H$_{2}$FO$_{3}$. D) HFO. Show Answer Correct Answer: A) HF. 58. A salt is formed when nitric acid combines with sodium hydroxide. What is the name of the salt? A) Hydrogen Nitrate. B) Unique. C) Sodium nitrate. D) Sodium chloride. Show Answer Correct Answer: C) Sodium nitrate. 59. What is the formula for nitrous acid? A) HNO$_{3}$. B) HNO$_{4}$. C) HNO$_{2}$. D) HNO. Show Answer Correct Answer: C) HNO$_{2}$. 60. How Many Types Of Acids Are There A) 3. B) 4. C) 1. D) 5. Show Answer Correct Answer: B) 4. ← PreviousNext →Related QuizzesScience QuizzesClass 7 QuizzesClass 7 Science Chapter 4 Acids Quiz 1Class 7 Science Chapter 4 Acids Quiz 2Class 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 8Class 7 Science Chapter 4 Acids Quiz 9 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books