This quiz works best with JavaScript enabled. Home > Class 7 > Class 7 Science Chapter 4 Acids – Quiz 9 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 7 Science Chapter 4 Acids Quiz 9 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. The repeating units in both DNA and RNA are called A) Hydrogen bonds. B) Nucleic acids. C) Nucleotides. D) Amino acids. Show Answer Correct Answer: C) Nucleotides. 2. Sulphuric acid is used in A) Toilet cleaner. B) Car batteries. C) Cleaning gold and silver. D) Food. Show Answer Correct Answer: B) Car batteries. 3. Which acid is called the king of chemicals? A) Hydrochloric acid. B) Benzoic acid. C) Acetic acid. D) Sulphuric acid. Show Answer Correct Answer: D) Sulphuric acid. 4. Phosphorous acid A) H$_{3}$PO$_{4}$. B) H$_{2}$PO$_{4}$. C) H$_{3}$P. D) Swarm. Show Answer Correct Answer: D) Swarm. 5. If an acid and a base react together it is called a ..... reaction A) Hypothetical. B) Photosynthesis. C) Neutralization. D) Variable. Show Answer Correct Answer: C) Neutralization. 6. Tastes bitter. A) Acids. B) Bases. C) Salts. D) All. Show Answer Correct Answer: B) Bases. 7. Identify the products of the following reaction:CaCO3 + 2HCl $\rightarrow$ A) Calcium hydrogen carbonate and chlorine gas. B) Calcium chloride and water. C) Calcium oxide, carbon dioxide and water. D) Calcium chloride, carbon dioxide and water. Show Answer Correct Answer: D) Calcium chloride, carbon dioxide and water. 8. What is the fomula of carbonic acid? A) H $ _ {2} $ co $ _ {3} $. B) H$_{2}$CrO$_{4}$. C) H$_{2}$C$_{2}$O$_{4}$. D) HCO$_{3}$. Show Answer Correct Answer: A) H $ _ {2} $ co $ _ {3} $. 9. Neutralisation reaction is a A) Physical and reversible change. B) Physical and irreversible change. C) Chemical and reversible change. D) Chemical and irreversible change. Show Answer Correct Answer: D) Chemical and irreversible change. 10. Which of the following codons will code for aspartic acid? A) AAU. B) GAG. C) GAU. D) UGG. Show Answer Correct Answer: C) GAU. 11. A hydronium ion is like a ..... molecule with an extra hydrogen atom. A) Acid. B) Base. C) Water. D) Vinegar. Show Answer Correct Answer: C) Water. 12. What factor can decrease the solubility of carboxylic acid in water? A) The increase in length of the hydrocarbon chain. B) The decrease in length of the hydrocarbon chain. C) The increase in number of carboxyl group. D) The number of hydrogen bond. Show Answer Correct Answer: A) The increase in length of the hydrocarbon chain. 13. PH of rain water in a pollution free area A) 10. B) 5.6. C) 7. D) 7, 4. Show Answer Correct Answer: C) 7. 14. A portion of mRNA is coded CUG. The corresponding DNA is coded A) GAC. B) GTC. C) CTG. D) CAG. Show Answer Correct Answer: A) GAC. 15. Why is toothpaste alkaline? A) It can neutralise strong alkaline inyour mouth. B) It can neutralise acid inyour mouth. C) It can refresh your teeth. D) Toothpaste is not alkaline. Show Answer Correct Answer: B) It can neutralise acid inyour mouth. 16. Select the name for the following acid:H$_{3}$PO$_{4}$ A) Phosphoric acid. B) Phosphorous acid. C) Hydrophosphoric acid. D) None of the above. Show Answer Correct Answer: A) Phosphoric acid. 17. When using pH paper, the pH of a solution can be determined by looking at the ..... of the paper. A) Texture. B) Color. C) Length. D) Mass. Show Answer Correct Answer: B) Color. 18. Antacids are examples of weak bases. Which of the following would most likely be the pH of an antacid? A) 2. B) 6. C) 8. D) 12. Show Answer Correct Answer: C) 8. 19. Which of these pH values would indicate that a solution is a weak base? A) 4. B) 5.6. C) 8. D) 13. Show Answer Correct Answer: C) 8. 20. What is the main reason carboxylic acid has the highest boiling point as compared to other compounds with comparable mass? A) It has carboxyl functional group. B) It is a strong acid. C) It has higher induced dipole-dipole interactions. D) It can form hydrogen bond in water. Show Answer Correct Answer: C) It has higher induced dipole-dipole interactions. 21. Most accepted model of DNA was proposed by A) Watson and Crick. B) Jacob and Monad. C) Korenberg. D) Frederick Mischer. Show Answer Correct Answer: A) Watson and Crick. 22. Each cell in our body contains an acid, name that acid. A) The decarbonicnucleic acid. B) The deoxyribonucleic acid. C) The diprotic acid. D) None of the above. Show Answer Correct Answer: B) The deoxyribonucleic acid. 23. Does your body break down Nucleic Acids for ATP? A) Yes. B) No. C) All the above. D) None of the above. Show Answer Correct Answer: B) No. 24. Which of the following is the strongest acid? A) Oven cleaner-13.5. B) Lemon juice-2.5. C) Soap-10. D) Blood-7.4. Show Answer Correct Answer: B) Lemon juice-2.5. 25. Name this acid. HClO A) Chloric acid. B) Perchloric acid. C) Hydrochloric acid. D) Hypochlorous acid. Show Answer Correct Answer: D) Hypochlorous 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 10Class 7 Science Chapter 4 Acids Quiz 11 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books