This quiz works best with JavaScript enabled. Home > Cbse > Class 7 > Science > Acids > Class 7 Science Chapter 4 Acids – Quiz 8 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 7 Science Chapter 4 Acids Quiz 8 (60 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. If the ph value is 5 what is the substance A) Acid. B) Base. C) Neutral. D) Sweet. Show Answer Correct Answer: A) Acid. 2. Which compound is used to make soda acid fire extinguisher? A) Bleaching Powder. B) Sodium Carbonate. C) Sodium Hydrogen Carbonate. D) Sodium Hydroxide. Show Answer Correct Answer: C) Sodium Hydrogen Carbonate. 3. Acids are what range on the pH scale? A) 0-6.99. B) 7. C) 7.1-14. D) 0-14. Show Answer Correct Answer: A) 0-6.99. 4. Proteins are complex biomolecules that contain ..... A) Sugars. B) Nucleic acids. C) Lipids. D) Amino acids. Show Answer Correct Answer: D) Amino acids. 5. Identify the acid present in tamarind. A) Citric acid. B) Tannic acid. C) Lactic acid. D) Tartaric acid. Show Answer Correct Answer: D) Tartaric acid. 6. In a water solution, how do acids differ from bases? A) Acids form salts, but bases do not. B) Acids form hydrogen ions (H+), while bases form hydroxide ions (OH-). C) Acids turn litmus blue, while bases turn litmus red. D) Bases form salts, but acids do not. Show Answer Correct Answer: B) Acids form hydrogen ions (H+), while bases form hydroxide ions (OH-). 7. Curd can be stored in A) Steel. B) Bronze. C) Brass vessel. D) Copper vessel. Show Answer Correct Answer: A) Steel. 8. What is the chemical symbol for Hydrochloric Acid A) Ha. B) Hc. C) HCl. D) H. Show Answer Correct Answer: C) HCl. 9. What is the name of the acid with the formula HCl? A) Chlorous Acid. B) Chloric Acid. C) Hypochloric Acid. D) Hydrochloric Acid. Show Answer Correct Answer: D) Hydrochloric Acid. 10. The correct formula for phosphoric acid A) H $ _ {2} $ pH $ _ {4} $. B) H$_{2}$PO$_{4}$. C) HPO $ _ {4} $. D) HPO $ _ {3} $. Show Answer Correct Answer: B) H$_{2}$PO$_{4}$. 11. What happens immediately after you dissolve acid in water? A) Positively charged hydrogen atoms are released. B) Hydronium ions are released. C) Negatively charged hydrogen atoms are released. D) Neutrally charged hydrogen atoms are released. Show Answer Correct Answer: A) Positively charged hydrogen atoms are released. 12. The word equation for an acid reacting with a base is A) Acid + metal $\rightarrow$. B) Acid + metal $\rightarrow$. C) Acid + metal $\rightarrow$. D) Acid + base $\rightarrow$. Show Answer Correct Answer: A) Acid + metal $\rightarrow$. 13. If a solution has a pH of 1.5, then litmus would turn A) Yellow. B) Blue. C) Red. D) Purple. Show Answer Correct Answer: C) Red. 14. What elements make up Proteins? A) C, H, O. B) C, H, O, N, (S). C) C, H, O, N, P. D) C, H, O, N. Show Answer Correct Answer: B) C, H, O, N, (S). 15. A solution with a pH of 7 is ..... A) Increasing. B) Apple juice. C) Neutral. D) Decreasing. Show Answer Correct Answer: C) Neutral. 16. What are neutrals? A) They are acidic in nature. B) They are neither acidic nor basic. C) They are basic. D) None of these. Show Answer Correct Answer: B) They are neither acidic nor basic. 17. When put into a basic solution, red litmus paper ..... A) Turns magenta. B) Turns violet. C) Stays red. D) Turns blue. Show Answer Correct Answer: D) Turns blue. 18. Which substance is alkali? A) Lemon juice. B) Soft drink. C) Toothpaste. D) Vinegar. Show Answer Correct Answer: C) Toothpaste. 19. The reaction between HCOOH and CH$_{3}$COOH produces an ester called methyl methanoate. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 20. Egg shell is made up of A) Caco3. B) CA (OH) 2. C) CaO. D) CaCl2. Show Answer Correct Answer: A) Caco3. 21. Weaker bases have a pH closer to ..... A) 14. B) 4. C) 8. D) 0. Show Answer Correct Answer: C) 8. 22. What are the weak acids and bases? A) All acids and bases are weak. B) If not classified as strong, the acid/base is considered weak. C) All acids and bases are strong. D) There are more strong acids and bases than there are weak acids/bases. Show Answer Correct Answer: B) If not classified as strong, the acid/base is considered weak. 23. A compound that donates H$^{+}$ ions is A) An Arrhenius Acid. B) A Bronsted-Lowry Base. C) A Bronsted-Lowry Acid. D) An Arrhenius Base. Show Answer Correct Answer: C) A Bronsted-Lowry Acid. 24. Write the formula of the following compound.Hydrochloric acid A) HCl. B) Hclo $ _ {2} $. C) HCLO $ _ {3} $. D) None of the above. Show Answer Correct Answer: A) HCl. 25. Sodium phosphate (Na$_{3}$PO$_{4}$) is a A) Weak Acid. B) Weak Base. C) Strong base. D) Strong Acid. Show Answer Correct Answer: B) Weak Base. 26. Soluble Bases are called A) Organic. B) Alkali. C) Synthetic. D) Natural. Show Answer Correct Answer: B) Alkali. 27. What is an Arrhenius base? A) A substance that produces H+ ion in water. B) A substance that produces OH-ion in water. C) A substance that produces H-ion in water. D) A substance that produces OH+ ion in water. Show Answer Correct Answer: B) A substance that produces OH-ion in water. 28. How many atoms are there in CH$_{4}$? A) 4. B) 6. C) 1. D) 5. Show Answer Correct Answer: D) 5. 29. What is the name of the acid with the formula H$_{2}$SO$_{4}$? A) Sulfurous Acid. B) Sulfate Acid. C) Hydrogen sulfuric Acid. D) Sulfuric Acid. Show Answer Correct Answer: D) Sulfuric Acid. 30. These acids are mineral acid except? A) Ethanoic acid. B) Hydrochloric acid. C) Nitric acid. D) Nitric acid. Show Answer Correct Answer: A) Ethanoic acid. 31. The correct formula for carbonic acid is A) H $ _ {2} $ co $ _ {2} $. B) HCl. C) HCO$_{3}$. D) H $ _ {2} $ co $ _ {3} $. Show Answer Correct Answer: D) H $ _ {2} $ co $ _ {3} $. 32. What is the formula for Hydrosulfuric Acid? A) H$_{2}$S. B) H$_{2}$(SO$_{3}$). C) H$_{2}$(SO$_{2}$). D) H$_{2}$(SO$_{4}$). Show Answer Correct Answer: A) H$_{2}$S. 33. What is the [H$^{+}$] if the pH is 4.0? A) 1.0 x 10$^{-4 }$M. B) 1.0 x 10$^{-10}$ M. C) 1.0 x 10$^{-14}$ M. D) 1.0 x 10$^{-7}$ M. Show Answer Correct Answer: A) 1.0 x 10$^{-4 }$M. 34. Weak acids have a lower pH than stronger acids? A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 35. What is a substance that produces Hydronium ions when it dissolves in Water? A) Acid. B) Base. C) Hydronium Ion. D) Ionization. Show Answer Correct Answer: A) Acid. 36. Lime water turns A) Blue litmus red. B) Red litmus blue. C) No change. D) None of the above. Show Answer Correct Answer: B) Red litmus blue. 37. In aqueous solution, H+ ions exist as A) Either H$_{3}$0$^{+ }$or H$_{9}$O$_{4}$$^{+}$. B) Neither of these. C) H$_{3}$0$^{+}$. D) H$_{9}$O$_{4}$$^{+}$. Show Answer Correct Answer: C) H$_{3}$0$^{+}$. 38. A turmeric stain on a white shirt turns to red when washed with soap. It is because ..... A) Soap solution is acidic in nature. B) Soap solution is basic in nature. C) Soap solution is both acidic and basic in nature. D) Soap solution is neutral in nature. Show Answer Correct Answer: B) Soap solution is basic in nature. 39. Which one of the following is base? A) Sugar syrup. B) Vinegar. C) Soap. D) Lemon juice. Show Answer Correct Answer: C) Soap. 40. The "Polyatomic Ion" chart is needed to name: A) Binary acids. B) Oxyacids. C) Jack acids. D) All acids. Show Answer Correct Answer: B) Oxyacids. 41. When the soil is too Basic, what do you add to neutralise the effect? A) Nitric Acid. B) Basic Quicklime. C) Organic Matter. D) Phenolphthalein. Show Answer Correct Answer: C) Organic Matter. 42. Which base is used to cure acidity problems? A) Ammonium hydroxide. B) Sodium hydroxide. C) Potassium hydroxide. D) Magnesium hydroxide. Show Answer Correct Answer: D) Magnesium hydroxide. 43. ..... is a compound that contains one or more hydrogen atoms and produces hydrogen ions when dissolved in water. A) An acid. B) A base. C) A salt. D) None of the above. Show Answer Correct Answer: A) An acid. 44. Which of the following statements is true concerning acids and bases? A) Acids and bases don't react with each other. B) Acids mixed with bases neutralize each other. C) Acids mixed with bases make stronger bases. D) Acids mixed with bases make stronger acids. Show Answer Correct Answer: B) Acids mixed with bases neutralize each other. 45. A drop of solution 'X' is placed on a strip of pH paper. A deep red colour is produced. The solution 'X' is A) H$_{2}$O. B) HCl. C) On $ _ {2} $ co $ _ {3} $. D) NaOH. Show Answer Correct Answer: B) HCl. 46. Lactic acid present in A) Lemon. B) T e a. C) Apple. D) Milk. Show Answer Correct Answer: D) Milk. 47. Metal oxide + acid $\rightarrow$ A) Salt and water. B) Salt and hydrogen. C) Salt, carbon dioxide and water. D) Salt and vinegar. Show Answer Correct Answer: A) Salt and water. 48. Which molecule contains your genetic information stored in your cells? A) NADPH. B) DNA. C) ADP. D) ATP. Show Answer Correct Answer: B) DNA. 49. Hydrogen bonds are really a form of A) Hydrophilic charge. B) Negative charge. C) Hydrophobic charge. D) Electrostatic charge. Show Answer Correct Answer: D) Electrostatic charge. 50. An acid is a solution that contains ..... ions dissolved in water. A) Positive. B) Negative. C) All the above. D) None of the above. Show Answer Correct Answer: A) Positive. 51. Manure is added, when the soil is too ..... A) Acidic. B) Basic. C) Neutral. D) None of these. Show Answer Correct Answer: B) Basic. 52. What is the formula for carbonic acid? A) H $ _ {2} $ co $ _ {2} $. B) H $ _ {2} $ co $ _ {3} $. C) CO$_{3}$. D) HCO$_{2}$. Show Answer Correct Answer: B) H $ _ {2} $ co $ _ {3} $. 53. What is the formula for hydrochloric acid? A) H$_{3}$ClO$_{3}$. B) HCl. C) HCLO $ _ {3} $. D) HCLO. Show Answer Correct Answer: B) HCl. 54. The correct formula for hydrobromic acid is A) HBE. B) HBr. C) HCl. D) H$_{2}$Br. Show Answer Correct Answer: B) HBr. 55. True or FalseAcids turn red in turmeric indicator. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 56. The process of creating RNA using DNA as the template is A) Translation. B) Transcription. C) Translocation. D) Transylvania. Show Answer Correct Answer: B) Transcription. 57. In the following chemical equation, which compound is the base?HCl + NH$_{3 }$$\rightarrow$ NH$_{4}$$^{+ }$+ Cl$^{-}$ A) Cl$^{-}$. B) HCl. C) NH$_{3 }$. D) NH$_{4}$$^{+}$. Show Answer Correct Answer: C) NH$_{3 }$. 58. Which of the following is different from others? A) $ _ {2} $ of. B) CuO. C) SO$_{2}$. D) Cao. Show Answer Correct Answer: C) SO$_{2}$. 59. Which amino acid contain the aromatic ring A) Threonine. B) Tryptophan. C) Tyrosine. D) None of the above. Show Answer Correct Answer: B) Tryptophan. 60. What is the function of DNA? A) Tells you it is a nucleic acid and not a protein. B) Carrier of genetic information. C) Creates proteins. D) Allows things to enter and leave the cell. Show Answer Correct Answer: B) Carrier of genetic information. ← 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 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 9 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books