This quiz works best with JavaScript enabled. Home > Cbse > Class 7 > Science > Acids > Class 7 Science Chapter 4 Acids – Quiz 1 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 7 Science Chapter 4 Acids Quiz 1 (60 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Acids taste ..... A) Sweet. B) Bitter. C) Spicy. D) Sour. Show Answer Correct Answer: D) Sour. 2. Colour of litmus in ammonium hydroxide A) Black. B) Red. C) Orange. D) Blue. Show Answer Correct Answer: D) 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. Litmus is extracted from A) Grapes. B) Lichens. C) Curd. D) Cabbage. Show Answer Correct Answer: B) Lichens. 5. Which has a bitter taste? A) Base. B) WHAT. C) Flagella. D) Acid. Show Answer Correct Answer: A) Base. 6. H$_{3}$PO$_{4}$ is an example of a ..... A) Base. B) Non-electrolyte. C) Acid. D) Salt. Show Answer Correct Answer: C) Acid. 7. When CO$_{2}$ is passed through lime water, it turns milky. the milkiness in due to formation of A) H$_{2}$ O. B) CO$_{2}$. C) CaO. D) CaCO$_{3}$. Show Answer Correct Answer: D) CaCO$_{3}$. 8. A substance that is 3 on the pH scale would be a(n): A) Solute. B) Neutral. C) Base. D) Acid. Show Answer Correct Answer: D) Acid. 9. Hydrophilic amino acid side chains are attracted by A) In molecules. B) Cl molecules. C) K molecules. D) H20 molecules. Show Answer Correct Answer: D) H20 molecules. 10. An arrhenius base A) Is a proton donor. B) Produces hydrogen ions in a solution. C) Produces hydroxide ions in a solution. D) Is a proton acceptor. Show Answer Correct Answer: C) Produces hydroxide ions in a solution. 11. 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. 12. Vinegar turns blue litmus paper ..... because it is ..... A) Red, acidic. B) Back to blue, acidic. C) Green, neutral. D) Purple, basic. Show Answer Correct Answer: A) Red, acidic. 13. Which of the following pH numbers indicate a strong alkali? A) 1. B) 5. C) 14. D) 7. Show Answer Correct Answer: C) 14. 14. Which of the following would be classified as an acid? A) Liquid drain cleaner. B) Soap. C) Toothepaste. D) Orange juice. Show Answer Correct Answer: D) Orange juice. 15. Which of the following is a neutralisation reaction? A) Metal + acid $\rightarrow$ salt + water. B) Base + acid $\rightarrow$ salt + water. C) Carbonate + acid $\rightarrow$salt+ carbon dioxide + hydrogen. D) Metal + acid $\rightarrow$ salt + hydrogen. Show Answer Correct Answer: B) Base + acid $\rightarrow$ salt + water. 16. 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. 17. An unknown substance is added to a solution and the pH increases. The substance is: A) Sweet. B) Basic. C) Acidic. D) Solvent. Show Answer Correct Answer: B) Basic. 18. Which of the following is the strongest base? A) 15. B) 14. C) 4. D) 7. Show Answer Correct Answer: B) 14. 19. 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) Equivalence point. C) Neutral point. D) Endpoint. Show Answer Correct Answer: D) Endpoint. 20. 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. 21. In a neutral solution, most amino acids exist as: A) Zwitterion molecules. B) Positively charged compounds. C) Negatively charged compounds. D) Hydrohobic molecules. Show Answer Correct Answer: A) Zwitterion molecules. 22. 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. 23. A proton or H$^{+}$ (hydrogen ion) reacts with water to form a A) Hydroxide ion OH$^{-}$. B) Hydrogen carbonate HCO$_{3}$$^{-}$. C) Hydronium ion H$_{3}$O$^{+}$. D) Carbonate ion CO$_{3}$$^{2-}$. Show Answer Correct Answer: C) Hydronium ion H$_{3}$O$^{+}$. 24. Which of these is true about RNA? A) Has a double helix. B) Has a single helix. C) Contains thymine. D) None of the above. Show Answer Correct Answer: B) Has a single helix. 25. Which of the following particles is in the smallest amount in a dilute aqueous solution of ethanoic acid? A) OH$^{-}$. B) CH$_{3}$COO$^{-}$. C) H$^{+}$. D) CH$_{3}$COOH. Show Answer Correct Answer: A) OH$^{-}$. 26. Ranging from 0 to 14, a pH value indicates how acidic or basic a solution is. Which of these pH values would be a strong acid? A) 2. B) 13. C) 9. D) 6. Show Answer Correct Answer: A) 2. 27. Tomato contains ..... acid A) Oxalic acid. B) Malic acid. C) Tartaric acid. D) Citric acid. Show Answer Correct Answer: A) Oxalic acid. 28. Methyl orange is an ..... A) Acid. B) Indicator. C) Base. D) None of the above. Show Answer Correct Answer: B) Indicator. 29. When added to water what releases hydrogen ions? A) Isotopes. B) Noble Gas. C) Transition Metals. D) Acid. Show Answer Correct Answer: D) Acid. 30. ATCAGTGAT A codon is a sequence of three nucleotides that code for an amino acid. If the DNA sequence shown here goes through transcription and translation, how many amino acids will result from this sequence? A) 2. B) 5. C) 3. D) 4. Show Answer Correct Answer: C) 3. 31. What kind of bond holds the two strands of DNA together? A) Ionic bonds. B) Polar bonds. C) Covalent bonds. D) Hydrogen bonds. Show Answer Correct Answer: D) Hydrogen bonds. 32. What is the pH of distilled water? A) PH 12. B) PH 3. C) PH 8. D) PH 7. Show Answer Correct Answer: D) PH 7. 33. When using the Arrhenius model, what types of ions indicate that a compound is an acid? A) H$^{+}$. B) OH$^{-1}$. C) All the above. D) None of the above. Show Answer Correct Answer: A) H$^{+}$. 34. What is the name for this acid H$_{2}$SO$_{4}$ A) Nitric acid. B) Sulfuric acid. C) Hydrochloric acid. D) Phosphorus acid. Show Answer Correct Answer: B) Sulfuric acid. 35. What happens when acid and base react? A) Only water is formed. B) They get neutralized. C) Acid gets diluted. D) An explosion results. Show Answer Correct Answer: B) They get neutralized. 36. Is the following compound an acid or a base?HI A) Acid. B) Base. C) All the above. D) None of the above. Show Answer Correct Answer: A) Acid. 37. A pH of 3 is how many times more acidic than a pH of 5? A) 20. B) 10. C) 2. D) 100. Show Answer Correct Answer: D) 100. 38. Acids produce ..... in an aqueous solution? A) Acid molecules. B) Water particles. C) Hydrogen ions (H+). D) Hydroxide ions. Show Answer Correct Answer: C) Hydrogen ions (H+). 39. What is the chemical symbol for Nitric Acid A) Hay. B) HNI3. C) H3NO. D) Hay. Show Answer Correct Answer: B) HNI3. 40. Which of the following pH numbers indicates a strong acid? A) 14. B) 1. C) 7. D) 5. Show Answer Correct Answer: B) 1. 41. Bleach and oven cleaner are: A) Strong bases. B) Weak acids. C) Weak bases. D) Strong acids. Show Answer Correct Answer: A) Strong bases. 42. This acid is used in car batteries and is also called 'Oil of Vitriol'. A) Nitric acid. B) Sulphuric acid. C) Phosphoric acid. D) Carbonic acid. Show Answer Correct Answer: B) Sulphuric acid. 43. Which of the following is not a base? A) Lemon juice. B) Washing soda. C) Caustic potash. D) Caustic soda. Show Answer Correct Answer: A) Lemon juice. 44. Bleaching powder is soluble in cold water giving a milky solution due to- A) Available chlorine. B) Calcium carbonate formation. C) The absorption of carbon dioxide from atmosphere. D) Lime present in it. Show Answer Correct Answer: D) Lime present in it. 45. Which of the following is not an olfactory indicator A) Vanilla. B) Clove. C) Litmus. D) Onion. Show Answer Correct Answer: C) Litmus. 46. A colourless and odourless gas is liberated when hydrochloric acid is added to a solution of washing soda. The name of the gas is A) Sulphur dioxide. B) Sulphur trioxide. C) Carbon dioxide. D) Nitrogen dioxide. Show Answer Correct Answer: C) Carbon dioxide. 47. Identify the true statement about the following reaction:F$^{-}$ + H$_{2}$O $\rightarrow$ HF +OH$^{-}$ A) H$_{2}$O is a bronsted lowry acid. B) H$_{2}$O is not an acid or base according to either model. C) H$_{2}$O is a bronsted lowry base. D) H$_{2}$O is an arrhenius acid. Show Answer Correct Answer: A) H$_{2}$O is a bronsted lowry acid. 48. Acids are ..... to taste. A) Sweet. B) Sour. C) Bitter. D) All of these. Show Answer Correct Answer: B) Sour. 49. Complete the following reaction:Hydrochloric acid + magnesium hydroxide $\rightarrow$ A) Magnesium chloride + water. B) Magnesium + water. C) Magnesium chloride + water + carbon dioxide. D) Magnesium chloride + hydrogen gas. Show Answer Correct Answer: A) Magnesium chloride + water. 50. Which of the following base is used in the manufacture of bleaching powder? A) Potassium hydroxide. B) Sodium hydroxide. C) Calcium hydroxide. D) Magnesium hydroxide. Show Answer Correct Answer: C) Calcium hydroxide. 51. If a litmus paper does not change color (stays red or blue), the solution is- A) An Acid. B) A Base. C) Neutral. D) None of the above. Show Answer Correct Answer: C) Neutral. 52. Reaction between acid and alkali producing salt and water: A) Decomposition. B) Neutralization. C) Precipitation. D) Combustion. Show Answer Correct Answer: B) Neutralization. 53. Who were the alchemists? A) A group of people who didn't trust a guy named Al. B) A group of people long ago who tried to turn ordinary metal into gold using different liquids and experimentation. C) A band. D) A group of scientists in the 1950's who created penicillin. Show Answer Correct Answer: B) A group of people long ago who tried to turn ordinary metal into gold using different liquids and experimentation. 54. Which option below places the pH values in the correct order, from WEAKEST ACID to STRONGEST ACID? A) 6, 4, 3, 1. B) 13, 12, 10, 8. C) 7, 9, 11, 14. D) 1, 4, 5, 6. Show Answer Correct Answer: A) 6, 4, 3, 1. 55. Incorrect statement about acids is/are A) They have bitter taste. B) They changes the colour or red litmus to blue. C) They changes the colour or blue litmus to red. D) All above. Show Answer Correct Answer: C) They changes the colour or blue litmus to red. 56. Calcium carbonate + sulphuric acid $\rightarrow$ A) Calcium hydroxide, carbon dioxide and water. B) Acid rain. C) Calcium sulphate and hydrogen. D) Calcium sulphate, carbon dioxide and water. Show Answer Correct Answer: D) Calcium sulphate, carbon dioxide and water. 57. Methyl Orange Index Color in Acid Solutions ..... A) Yellow. B) Orange. C) Green. D) Red. Show Answer Correct Answer: D) Red. 58. A salt is formed when nitric acid combines with sodium hydroxide. What are present in the salt that forms? A) Sodium chloride. B) Sodium ions and nitrate ions. C) Only sodium ions. D) Only nitrate ions. Show Answer Correct Answer: B) Sodium ions and nitrate ions. 59. An acid reacts with a metal carbonate to produce A) Salt, water and hydrogen gas. B) Salt, water and carbon dioxide. C) Limewater. D) Salt and water. Show Answer Correct Answer: B) Salt, water and carbon dioxide. 60. Methyl orange added to soda water A) Turns green. B) Turns purple. C) Turns red. D) Turns blue. Show Answer Correct Answer: C) Turns red. Next →Related QuizzesScience QuizzesClass 7 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 9 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books