This quiz works best with JavaScript enabled. Home > Class 7 > Class 7 Science Chapter 4 Acids – Quiz 19 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 7 Science Chapter 4 Acids Quiz 19 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Nitrous Acid A) HNO2. B) H2NO2. C) HNI3. D) None of the above. Show Answer Correct Answer: A) HNO2. 2. Which compound is used to make soda acid fire extinguisher? A) Sodium Carbonate. B) Sodium Hydroxide. C) Bleaching Powder. D) Sodium Hydrogen Carbonate. Show Answer Correct Answer: D) Sodium Hydrogen Carbonate. 3. Acids are what range on the pH scale? A) 0-14. B) 0-6.99. C) 7. D) 7.1-14. Show Answer Correct Answer: B) 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) Tannic acid. B) Lactic acid. C) Tartaric acid. D) Citric acid. Show Answer Correct Answer: C) Tartaric acid. 6. In a water solution, how do acids differ from bases? A) Acids form salts, but bases do not. B) Acids turn litmus blue, while bases turn litmus red. C) Acids form hydrogen ions (H+), while bases form hydroxide ions (OH-). D) Bases form salts, but acids do not. Show Answer Correct Answer: C) Acids form hydrogen ions (H+), while bases form hydroxide ions (OH-). 7. Curd can be stored in A) Brass vessel. B) Copper vessel. C) Steel. D) Bronze. Show Answer Correct Answer: C) Steel. 8. What is the chemical symbol for Hydrochloric Acid A) HCl. B) H. C) Ha. D) Hc. Show Answer Correct Answer: A) HCl. 9. Salts A) Formed from joining positive and negative ions. B) Increase OH ions. C) Forms a salt and water. D) Increases H2O ions. Show Answer Correct Answer: A) Formed from joining positive and negative ions. 10. What is the name of the acid with the formula HCl? A) Chloric Acid. B) Chlorous Acid. C) Hypochloric Acid. D) Hydrochloric Acid. Show Answer Correct Answer: D) Hydrochloric Acid. 11. The correct formula for phosphoric acid A) HPO $ _ {4} $. B) H$_{2}$PO$_{4}$. C) H $ _ {2} $ pH $ _ {4} $. D) HPO $ _ {3} $. Show Answer Correct Answer: B) H$_{2}$PO$_{4}$. 12. 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. 13. The word equation for an acid reacting with a base is A) Acid + metal $\rightarrow$. B) Acid + base $\rightarrow$. C) Acid + metal $\rightarrow$. D) Acid + metal $\rightarrow$. Show Answer Correct Answer: A) Acid + metal $\rightarrow$. 14. If a solution has a pH of 1.5, then litmus would turn A) Red. B) Purple. C) Blue. D) Yellow. Show Answer Correct Answer: A) Red. 15. What elements make up Proteins? A) C, H, O, N, (S). B) C, H, O, N. C) C, H, O, N, P. D) C, H, O. Show Answer Correct Answer: A) C, H, O, N, (S). 16. A solution with a pH of 7 is ..... A) Increasing. B) Neutral. C) Decreasing. D) Apple juice. Show Answer Correct Answer: B) Neutral. 17. 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. 18. When put into a basic solution, red litmus paper ..... A) Stays red. B) Turns blue. C) Turns magenta. D) Turns violet. Show Answer Correct Answer: B) Turns blue. 19. Which substance is alkali? A) Toothpaste. B) Lemon juice. C) Vinegar. D) Soft drink. Show Answer Correct Answer: A) Toothpaste. 20. 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. 21. Egg shell is made up of A) Caco3. B) CaO. C) CA (OH) 2. D) CaCl2. Show Answer Correct Answer: A) Caco3. 22. Weaker bases have a pH closer to ..... A) 8. B) 14. C) 0. D) 4. Show Answer Correct Answer: A) 8. 23. Neutralisation is a reaction between A) Acid and base. B) Acid and a neutral substance. C) Two acids. D) Two bases. Show Answer Correct Answer: A) Acid and base. 24. 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. 25. A compound that donates H$^{+}$ ions is A) A Bronsted-Lowry Acid. B) An Arrhenius Acid. C) A Bronsted-Lowry Base. D) An Arrhenius Base. Show Answer Correct Answer: A) A Bronsted-Lowry Acid. ← 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