This quiz works best with JavaScript enabled. Home > Class 7 > Class 7 Science Chapter 4 Acids – Quiz 31 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 7 Science Chapter 4 Acids Quiz 31 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. In a base phenolphthalein will give what color? A) Green. B) Blue. C) Pink. D) Clear. Show Answer Correct Answer: C) Pink. 2. Which characteristics describe a base? 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: B) Bitter, slippery, indicator turns blue, pH greater than 7, produces hydroxide ions (OH$^{-}$). 3. Which has a slippery texture? A) Acid. B) Base. C) All the above. D) None of the above. Show Answer Correct Answer: B) Base. 4. Which of the following word pairs correctly completes the sentence below? ..... are corrosive substances characterized as having a oily feel, a bitter taste, and a ..... A) Acids; pH less than 7. B) Acids; pH greater than 7. C) Bases; pH greater than 7. D) Bases; pH less than 7. Show Answer Correct Answer: C) Bases; pH greater than 7. 5. Which of the following is a binary acid? A) H$_{2}$SO$_{4}$. B) HNO$_{3}$. C) H $ _ {2} from $. D) HC $ _ {2} $ h $ {3} $ o $ {2} $. Show Answer Correct Answer: C) H $ _ {2} from $. 6. Name the acid present in our stomach. A) Sulphuric acid. B) Hydrochloric acid. C) Nitric acid. D) Carbonic acid. Show Answer Correct Answer: B) Hydrochloric acid. 7. What are the differences between proteins and lipids? A) Proteins function to help speed up reactions, copy DNA, and transport moleculesLipids allow things to enter/leave the cell and can store energy. B) Proteins all things to enter/leave the cell and can store energyLipids function to help speed up reactions, copy DNA, and transport molecules. C) None of the above. D) None of the above. Show Answer Correct Answer: A) Proteins function to help speed up reactions, copy DNA, and transport moleculesLipids allow things to enter/leave the cell and can store energy. 8. Lemon juice is ..... in taste A) Sour. B) Bitter. C) Salty. D) Sweet. Show Answer Correct Answer: A) Sour. 9. What is another name for basic A) Arrhenius. B) Lewis. C) Alkenes. D) Alkaline. Show Answer Correct Answer: D) Alkaline. 10. HF A) Hydrofluoric acid. B) Hypofluoric acid. C) Hydrogen fluorine acid. D) None of the above. Show Answer Correct Answer: A) Hydrofluoric acid. 11. When acid and base reacts ..... and ..... are formed? A) Salt, Hydrogen. B) Salt, Water. C) Salt, Carbon dioxide. D) Hydrogen, carbondioxide. Show Answer Correct Answer: B) Salt, Water. 12. Which of the following is basic in nature? A) Lime water. B) Baking soda. C) Both (a) and (b). D) Lemon juice. Show Answer Correct Answer: C) Both (a) and (b). 13. Which is a basic amino acid A) Alanine. B) Histidine. C) Serine. D) Proline. Show Answer Correct Answer: B) Histidine. 14. When you left a steel nail in a bag with copper pennies and a vinegar and salt solution, the nail turned a copper color. What happened? A) The steel nail turned into a gold nail!. B) The steel nail became copper all the way through. C) Nothing happened in my bag, so I don't care. D) The nail was covered with a thin layer of copper. Show Answer Correct Answer: D) The nail was covered with a thin layer of copper. 15. NH$_{3}$ + H$_{2}$O + CO$_{2}$ + NaCl gives A) NaHCO $ _ {3} $ + NH $ _ {4} $ Cl. B) NaHCO $ _ {3} $. C) NH$_{4}$Cl. D) NaHCO $ _ {3} $ + NH $ _ {4} $ Cl + H $ _ {2} $ o. Show Answer Correct Answer: A) NaHCO $ _ {3} $ + NH $ _ {4} $ Cl. 16. What is the name of the following:NaOH A) Sodium hydroxide. B) Sodium oxide hydrogen. C) Hydrosodium acid. D) Sodium hydrogen oxide. Show Answer Correct Answer: A) Sodium hydroxide. 17. The color of universal indicator in hydrochloric acid: A) Red. B) Blue. C) Purple. D) Green. Show Answer Correct Answer: A) Red. 18. Is this neutralised wasp sting and vinegar A) Yes. B) No. C) All the above. D) None of the above. Show Answer Correct Answer: A) Yes. 19. The pH value of an acid represents its ..... of positive ions in the solution A) Amount. B) Concentration. C) Color. D) Charge. Show Answer Correct Answer: B) Concentration. 20. OUR STOMACH CONTAINS ..... A) SODIUM HYDROGEN. B) HYDROCHLORIC ACID. C) AMMONIUM HYDROXIDE. D) NONE OF THESE. Show Answer Correct Answer: B) HYDROCHLORIC ACID. 21. A solution with a pH value of 3 is considered? A) Acidic. B) Basic. C) Neutral. D) Salty. Show Answer Correct Answer: A) Acidic. 22. The backbone of DNA is made up of ..... & ..... units. A) Sugar & base. B) Sugar & phosphate. C) Base & phosphate. D) Phosphate & phosphate. Show Answer Correct Answer: B) Sugar & phosphate. 23. The salt formed when sulfuric acid reacts with iron oxide (rust) is A) Iron chloride. B) Iron hydroxide. C) Iron nitrate. D) Iron sulfate. Show Answer Correct Answer: D) Iron sulfate. 24. Which of the following is NOT part of a nucleotide? A) Nitrogenous Base. B) Phosphate Group. C) Pentose Sugar. D) Fatty Acid. Show Answer Correct Answer: D) Fatty Acid. 25. What sugar is found in DNA? A) Glucose. B) Within limits. C) Dexoxyribose. D) Fructose. Show Answer Correct Answer: C) Dexoxyribose. ← 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