This quiz works best with JavaScript enabled. Home > Class 7 > Class 7 Science Chapter 4 Acids – Quiz 1 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 7 Science Chapter 4 Acids Quiz 1 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Acids taste ..... A) Sour. B) Spicy. C) Sweet. D) Bitter. Show Answer Correct Answer: A) Sour. 2. Colour of litmus in ammonium hydroxide A) Blue. B) Red. C) Orange. D) Black. Show Answer Correct Answer: A) Blue. 3. Lab safety gear includes A) Hat, sunglasses, and umbrella. B) Gloves, apron, and safety goggles. C) Procedure, vent hood, and sink. D) Shirt and shoes. Show Answer Correct Answer: B) Gloves, apron, and safety goggles. 4. Name HF A) Hydrofluoric acid. B) Hypofluoric acid. C) Hydrogen fluorine acid. D) Fluoric acid. Show Answer Correct Answer: A) Hydrofluoric acid. 5. Litmus is extracted from A) Curd. B) Grapes. C) Lichens. D) Cabbage. Show Answer Correct Answer: C) Lichens. 6. Which has a bitter taste? A) Base. B) Acid. C) Flagella. D) WHAT. Show Answer Correct Answer: A) Base. 7. H$_{3}$PO$_{4}$ is an example of a ..... A) Acid. B) Base. C) Salt. D) Non-electrolyte. Show Answer Correct Answer: A) Acid. 8. When CO$_{2}$ is passed through lime water, it turns milky. the milkiness in due to formation of A) H$_{2}$ O. B) CaCO$_{3}$. C) CaO. D) CO$_{2}$. Show Answer Correct Answer: B) CaCO$_{3}$. 9. A substance that is 3 on the pH scale would be a(n): A) Acid. B) Base. C) Neutral. D) Solute. Show Answer Correct Answer: A) Acid. 10. Hydrophilic amino acid side chains are attracted by A) H20 molecules. B) K molecules. C) In molecules. D) Cl molecules. Show Answer Correct Answer: A) H20 molecules. 11. An arrhenius base A) Produces hydroxide ions in a solution. B) Is a proton donor. C) Produces hydrogen ions in a solution. D) Is a proton acceptor. Show Answer Correct Answer: A) Produces hydroxide ions in a solution. 12. Another example of Neutralization Reaction is ..... A) Using Magnesium Hydroxide (Milk of Magnesia) as an antacid to correct excess acidity in the stomach. B) Using Nitric acid to clean gold and silver ornaments. C) Both of them. D) None of the above. Show Answer Correct Answer: A) Using Magnesium Hydroxide (Milk of Magnesia) as an antacid to correct excess acidity in the stomach. 13. Vinegar turns blue litmus paper ..... because it is ..... A) Red, acidic. B) Purple, basic. C) Back to blue, acidic. D) Green, neutral. Show Answer Correct Answer: A) Red, acidic. 14. Which of the following pH numbers indicate a strong alkali? A) 1. B) 5. C) 7. D) 14. Show Answer Correct Answer: D) 14. 15. Which of the following would be classified as an acid? A) Soap. B) Orange juice. C) Liquid drain cleaner. D) Toothepaste. Show Answer Correct Answer: B) Orange juice. 16. Which of the following is a neutralisation reaction? A) Metal + acid $\rightarrow$ salt + hydrogen. B) Metal + acid $\rightarrow$ salt + water. C) Carbonate + acid $\rightarrow$salt+ carbon dioxide + hydrogen. D) Base + acid $\rightarrow$ salt + water. Show Answer Correct Answer: D) Base + acid $\rightarrow$ salt + water. 17. What is is isoelectric point (pI) of amino acids? A) PH where there is equal number of zwitter ions and cations. B) PH where there is equal number of anions and zwitter ions. C) PH where the amino acid as zwitter ion carries no net charge. D) PH where the amino acid as zwitter ion carries net charge. Show Answer Correct Answer: C) PH where the amino acid as zwitter ion carries no net charge. 18. H$_{2}$SO$_{3}$ A) Sulfuric acid. B) Hydrosulfuric acid. C) Sulfurous acid. D) Persulfuric acid. Show Answer Correct Answer: C) Sulfurous acid. 19. An unknown substance is added to a solution and the pH increases. The substance is: A) Acidic. B) Basic. C) Solvent. D) Sweet. Show Answer Correct Answer: B) Basic. 20. Which of the following is the strongest base? A) 4. B) 14. C) 7. D) 15. Show Answer Correct Answer: B) 14. 21. When a reaction reaches neutralization and you can physically see a change in color from the indicator, this is called the A) Stoichiometric point. B) Endpoint. C) Equivalence point. D) Neutral point. Show Answer Correct Answer: B) Endpoint. 22. The two strands making up the DNA double helix molecule A) Contain ribose and deoxyribose in opposite strands. B) Are held together by hydrogen bonds. C) Are attached through a phosphate to hold the strands together. D) Contain uracil but not thymine. Show Answer Correct Answer: B) Are held together by hydrogen bonds. 23. In a neutral solution, most amino acids exist as: A) Positively charged compounds. B) Zwitterion molecules. C) Negatively charged compounds. D) Hydrohobic molecules. Show Answer Correct Answer: B) Zwitterion molecules. 24. When an acid is dissolved in water, it turns red litmus paper blue. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 25. A proton or H$^{+}$ (hydrogen ion) reacts with water to form a A) Hydroxide ion OH$^{-}$. B) Hydronium ion H$_{3}$O$^{+}$. C) Carbonate ion CO$_{3}$$^{2-}$. D) Hydrogen carbonate HCO$_{3}$$^{-}$. Show Answer Correct Answer: B) Hydronium ion H$_{3}$O$^{+}$. Next →Related QuizzesClass 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 10Class 7 Science Chapter 4 Acids Quiz 11 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books