This quiz works best with JavaScript enabled. Home > Class 7 > Class 7 Science Chapter 4 Acids – Quiz 23 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 7 Science Chapter 4 Acids Quiz 23 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Why are many enzymes soluble in water? A) They contain large numbers of hydrogen bonds. B) They contain many amino acids with hydrophilic side chains. C) They contain an active site. D) None of the above. Show Answer Correct Answer: B) They contain many amino acids with hydrophilic side chains. 2. (a) conduct electricity and turn litmus paper red. A) A. Acids. B) Bases. C) Neutral solutions. D) Salts. Show Answer Correct Answer: A) A. Acids. 3. What is the formula for chromic acid? A) H$_{2}$Cr. B) H$_{2}$CrO$_{4}$. C) H$_{2}$CrO$_{3}$. D) H$_{2}$CrO. Show Answer Correct Answer: B) H$_{2}$CrO$_{4}$. 4. Methanoic (HCOOH) is a A) Weak Acid. B) Weak Base. C) Strong Acid. D) Strong base. Show Answer Correct Answer: A) Weak Acid. 5. When neutralization reaction happens, they form- A) Salt and Sodium Chloride. B) Salt, Water and Heat. C) Heat and Sugar. D) None of the above. Show Answer Correct Answer: B) Salt, Water and Heat. 6. The pH of vinegar is 2.5. Vinegar is a ..... A) Strong acid. B) Strong base. C) Weak base. D) Weak acid. Show Answer Correct Answer: A) Strong acid. 7. A solution was added to some ammonium chloride then heated. A gas which had a pungent smell and turned moist red litmus blue was produced. Which of the following could have been present in the original solution? A) Hydrochloric acid. B) Vinegar. C) Potassium hydroxide. D) Sodium chloride. Show Answer Correct Answer: C) Potassium hydroxide. 8. Bromic acid A) HBr. B) HRO $ _ {2} $. C) HRO $ _ {3} $. D) H$_{3}$BrO$_{3}$. Show Answer Correct Answer: C) HRO $ _ {3} $. 9. Phhe value of neutral solvents A) 7. B) 4. C) 8. D) 10. Show Answer Correct Answer: A) 7. 10. Which of the following show an acid and its conjugate base pair (in that order) A) H$_{2}$SO$_{4}$, SO$_{4}$$^{2-}$. B) OH$^{-}$, H$_{2}$O. C) NH $ _ {4} $$^{+} $, h $ _ {2} $ o. D) H $ _ {2} $ Co $ {3} $, HCO $ _ {3} $$^{-} $. Show Answer Correct Answer: D) H $ _ {2} $ Co $ {3} $, HCO $ _ {3} $$^{-} $. 11. When action is done with acid and metal ..... give the gas. A) Hydrogen. B) Chlorine. C) Carbon Diaxide. D) Oxygen. Show Answer Correct Answer: A) Hydrogen. 12. Which one of the following can be used as acid-base indicator by visually impaired student? A) Litmus. B) Turmeric. C) Vanilla essence. D) Petunia leaves. Show Answer Correct Answer: C) Vanilla essence. 13. What is the name for this acid HF A) Fluoric acid. B) Hydrofluoric acid. C) Fluorous acid. D) None of the above. Show Answer Correct Answer: B) Hydrofluoric acid. 14. Which of the following is true about acids and bases? A) The lower the pH, the stronger the acid. B) The higher the pH, the stronger the acid. C) The lower the pH, the more neutral the acid. D) The higher the pH, the weaker the base. Show Answer Correct Answer: A) The lower the pH, the stronger the acid. 15. Nitric Acid is an Example of ..... A) Mineral Acid. B) Strong Acid. C) Weak Acid. D) Natural Acid. Show Answer Correct Answer: A) Mineral Acid. 16. Enzymes are an example of which macromolecule? A) Carbohydrates. B) Lipids. C) Proteins. D) Nucleic Acids. Show Answer Correct Answer: C) Proteins. 17. The name of the acid with the formula HF is ..... A) Flouric acid. B) Hydrofluoric acid. C) Fluorate acid. D) Hydrogen fluoridic acid. Show Answer Correct Answer: B) Hydrofluoric acid. 18. Which is the correct pairing? A) A-C. B) A-T. C) A-G. D) None of the above. Show Answer Correct Answer: B) A-T. 19. A BASE WAS GIVEN TO AN INDICATOR, AND IT GAVE PINK COLOUR. WHICH INDICATOR WAS USED? A) PHENOLPHTHALEIN. B) TURMERIC INDICATOR. C) LITMUS PAPER. D) CHINA ROSE INDICATOR. Show Answer Correct Answer: A) PHENOLPHTHALEIN. 20. 12M Ammonia is a weak alkali. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 21. Which characteristics describe an acid? A) Sour, indicator turns red, pH less than 7, produces hydrogen ions (H$^{+}$). B) Bitter, slippery, indicator turns blue, pH greater than 7, produces hydroxide ions (OH$^{-}$). C) Neutral, pH of 7. D) Sour, indicator turns red, pH greater than 7. Show Answer Correct Answer: A) Sour, indicator turns red, pH less than 7, produces hydrogen ions (H$^{+}$). 22. An aqueous solution turns red litmus blue. On excess addition of which of the following would reverse the change? A) Baking powder. B) Lime. C) Ammonium hydroxide solution. D) HCl. Show Answer Correct Answer: D) HCl. 23. Which pH has the most hydrogen ions (H+)? A) 2. B) 7. C) 10. D) 13. Show Answer Correct Answer: A) 2. 24. What is the formula for chloric acid? A) HCl. B) Hclo $ _ {4} $. C) HCLO $ _ {3} $. D) Hclo $ _ {2} $. Show Answer Correct Answer: C) HCLO $ _ {3} $. 25. Which of the following is neutral? A) Milk. B) Eggs. C) Gummy worms. D) Pure water. Show Answer Correct Answer: D) Pure water. ← PreviousNext →Related 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 8Class 7 Science Chapter 4 Acids Quiz 9Class 7 Science Chapter 4 Acids Quiz 10 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books