This quiz works best with JavaScript enabled. Home > Cbse > Class 7 > Science > Acids > Class 7 Science Chapter 4 Acids – Quiz 5 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 7 Science Chapter 4 Acids Quiz 5 (60 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Haleema has an unknown substance in a beaker. She wants to determine the relative pH of the unknown substance. She places a piece of blue litmus paper into the substance, and the litmus paper stays blue. The substance in the beaker ..... A) Has a neutral pH. B) Is a base. C) Does not have a pH. D) Is an acid. Show Answer Correct Answer: B) Is a base. 2. CALAMIINE SOLUTION CONTAINS ..... A) LIME WATER. B) ZINC CARBONATE. C) FORMIC ACID. D) None of the above. Show Answer Correct Answer: B) ZINC CARBONATE. 3. Which formula represents a hydroxide ion? A) NH$_{4}$$^{+}$. B) HCO$_{3}$$^{-}$. C) H$_{3}$O$^{+}$. D) OH$^{-}$. Show Answer Correct Answer: D) OH$^{-}$. 4. Neutralization is a reaction between A) Two acids. B) Two bases. C) One acid and one base. D) None of them. Show Answer Correct Answer: C) One acid and one base. 5. A food that contains all 9 essential amino acids A) Complete proteins. B) Whey. C) Globular proteins. D) Fibrous proteins. Show Answer Correct Answer: A) Complete proteins. 6. A substance with a pH of 7 is which of the following? A) Acid. B) Base. C) Neutral. D) None of the above. Show Answer Correct Answer: C) Neutral. 7. How do acids taste A) Salty. B) Spicy. C) Sweet. D) Sour. Show Answer Correct Answer: D) Sour. 8. Turns litmus blue. A) Acids. B) Bases. C) Salts. D) All. Show Answer Correct Answer: B) Bases. 9. Which of the following solutions has the lowest electrical conductivity? (All solutions are of the same concentration.) A) Ethanoic acid. B) Sodium chloride. C) Sulphuric acid. D) Sodium hydroxide. Show Answer Correct Answer: A) Ethanoic acid. 10. Chemical formula of baking soda is- A) MgSO$_{4}$. B) MgCO$_{3}$. C) Naco $ _ {3} $. D) NaHCO $ _ {3} $. Show Answer Correct Answer: D) NaHCO $ _ {3} $. 11. The acid present in tamarind is A) Oxalic acid. B) Formic acid. C) Acetic acid. D) Tartaric acid. Show Answer Correct Answer: D) Tartaric acid. 12. One prominent feature of DNA is its ..... -helix structure. A) Single. B) Double. C) Triple. D) None. Show Answer Correct Answer: B) Double. 13. Another name for inorganic acids is A) Ignorable acids. B) Mineral acids. C) Dangerous acids. D) Strong acids. Show Answer Correct Answer: B) Mineral acids. 14. H$_{2}$SO$_{4, }$HCl and HNO$_{3 are generally known as ..... acids }$ A) Natural. B) Organic. C) Edible. D) Mineral. Show Answer Correct Answer: D) Mineral. 15. Acids increase the concentration of what in water? A) H$^{+}$ ions. B) Hydrate ions. C) OH$^{-}$ ions. D) Hydroxide ions. Show Answer Correct Answer: A) H$^{+}$ ions. 16. Which chemical is called baking soda? A) Sodium hydroxide. B) Sodium chloride. C) Sodium carbonate. D) Sodium bicarbonate. Show Answer Correct Answer: D) Sodium bicarbonate. 17. What is the chemical formula for hydroxide? A) H$_{3}$O$^{-}$. B) H$_{3}$O$^{+}$. C) OH$^{+}$. D) OH-. Show Answer Correct Answer: D) OH-. 18. Is the following compound an acid or a base?NH$_{4}$OH A) Acid. B) Base. C) All the above. D) None of the above. Show Answer Correct Answer: B) Base. 19. Which of the following is a property of an acid(a) Slippery feel(b) Non-reactive(c) Sour taste(d) Strong color A) C. B) D. C) A. D) B. Show Answer Correct Answer: A) C. 20. What dictates the shape of a protein? A) The shape of the RBC. B) The consumed amino acids. C) How much you eat. D) The position of all amino acids in the chain. Show Answer Correct Answer: D) The position of all amino acids in the chain. 21. If a student places a few drops of hydrochloric acid on a piece of blue litmus paper, what will happen? A) It will stay blue. B) It will turn red. C) It will turn yellow. D) It will turn black. Show Answer Correct Answer: B) It will turn red. 22. Stronger acids have a pH closer to ..... A) 7. B) 0. C) 14. D) 9. Show Answer Correct Answer: B) 0. 23. The correct name for this acid CH$_{3}$COOH is A) Acetic acid. B) Hydrochloric acid. C) Acetate acid. D) Hydroacetic acid. Show Answer Correct Answer: A) Acetic acid. 24. A scale used to specify how acidic or basic a water-based solution is. Acidic solutions have a lower pH, while basic solutions have a higher pH A) Plate scale. B) PH Scale. C) Grocery store scale. D) Triple beam balance. Show Answer Correct Answer: B) PH Scale. 25. Concentration is A) A measure of how strong an acid or base is. B) The amount of solute in the solvent. C) The amount of solvent in the solute. D) The size of the particles in a solution. Show Answer Correct Answer: B) The amount of solute in the solvent. 26. The correct name for this acid H$_{2}$SO$_{3}$ is A) Sulfate acid. B) Hydrosulfiric acid. C) Sulfiric acid. D) Sulfurous acid. Show Answer Correct Answer: D) Sulfurous acid. 27. IF A DROP OF CHINA ROSE INDICATOR IS GIVEN TO AN ACID. IT CHANGES IT'S COLOUR FROM LIGHT PINK TO ..... A) GREEN. B) MAGENTA. C) YELLOW. D) REMAINS SAME. Show Answer Correct Answer: B) MAGENTA. 28. What was Rosalind Franklin's role in the discovery of the structure of DNA? A) She discovered that DNA is made of nucleotides. B) She carried out X-ray diffraction experiments leading to the determination that DNA is a double helix. C) She carried out X-ray diffraction experiments and concluded that DNA strands run in opposite directions. D) She produced the three-dimensional molecular model of DNA to show that it is a double helix. Show Answer Correct Answer: B) She carried out X-ray diffraction experiments leading to the determination that DNA is a double helix. 29. If you neutralize an acid with a base what will be produced? A) Sugar and water. B) Sugar and salt. C) Salt and water. D) Water. Show Answer Correct Answer: C) Salt and water. 30. What is the function of RNA? A) Messenger carrying instructions from DNA for controlling the synthesis of proteins. B) Carries genetic information. C) Allows things to enter/leave the cell. D) Tells you it is a nucleic acid and not a protein. Show Answer Correct Answer: A) Messenger carrying instructions from DNA for controlling the synthesis of proteins. 31. Name the acid that uses an acetate ion:HC$_{2}$H$_{3}$O$_{2}$ A) Acetous acid. B) Acetic acid. C) Hydrogen Acetate acid. D) Hydrogen Acetatic acid. Show Answer Correct Answer: B) Acetic acid. 32. Bicarbonate of soda (pH 9) be used to treat a bee sting. A bee sting is ..... A) Acidic. B) Neutral. C) Basic. D) Salt. Show Answer Correct Answer: A) Acidic. 33. Why should curd and sour substance not be kept in brass and copper vessels? A) Because they are acids, the acid will react and the container will be corroded. B) Because they are bases. C) They are indicators. D) Because they are olfactory indicators. Show Answer Correct Answer: A) Because they are acids, the acid will react and the container will be corroded. 34. All sour tasting fruits and vegetables contain ..... A) Sugar. B) Salt. C) Acid. D) None of the above. Show Answer Correct Answer: C) Acid. 35. What does an acid release when placed in water? A) Hydroxide ions (OH-). B) Hydrogen ions (H+). C) Nothing. D) Ions. Show Answer Correct Answer: B) Hydrogen ions (H+). 36. Vinegar is a dilute solution of ..... acid A) Acetic. B) Formic. C) Oxalic. D) Oleic. Show Answer Correct Answer: A) Acetic. 37. Bases are compounds which are characterized by ..... A) Bitterness in taste. B) A soapy touch. C) Sourness in taste. D) Both a & b. Show Answer Correct Answer: D) Both a & b. 38. A bronsted lowry 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: D) Is a proton acceptor. 39. Acid + Metal $\rightarrow$? A) Salt + Hydrogen. B) Salt + Water. C) Salt. D) Hydrogen. Show Answer Correct Answer: A) Salt + Hydrogen. 40. When more water is added to an acid it is ..... A) Diluted. B) Concentrated. C) Normal. D) None of the above. Show Answer Correct Answer: A) Diluted. 41. Pure sulphuric acid changes blue litmus paper red. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 42. Binary acids start with the prefix " ..... " A) Nitric. B) Acid. C) Hydraulic. D) Hydro. Show Answer Correct Answer: D) Hydro. 43. A reaction that does NOT contribute to acid rain is A) Sulphur dioxide + water $\rightarrow$ sulphurous acid. B) Sulphur trioxide + water $\rightarrow$ sulphuric acid. C) Hydrochloric acid + sodium hydroxide $\rightarrow$ sodium chloride + water. D) Nitrogen dioxide + water $\rightarrow$ nitrous acid + nitric acid. Show Answer Correct Answer: C) Hydrochloric acid + sodium hydroxide $\rightarrow$ sodium chloride + water. 44. When acid react with Zinc, which gas is formed? A) Oxygen. B) Hydrogen. C) Carbon of Oxide. D) None of the above. Show Answer Correct Answer: B) Hydrogen. 45. Which of the following is an acid-base indicator? A) Turmeric. B) Vinegar. C) Lime water. D) Baking soda. Show Answer Correct Answer: A) Turmeric. 46. Name this acid with the formula HF A) Fluoric acid. B) Hydrofluoric acid. C) Hypofluoric acid. D) Hydrogen fluorine acid. Show Answer Correct Answer: B) Hydrofluoric acid. 47. How many amino acids are coded for by this sequence of nucleotides:ATG GGA ACT CCA A) 2. B) 6. C) 4. D) 12. Show Answer Correct Answer: C) 4. 48. Amino acids are ampholytes because they can function as either a(an): A) Acid or base. B) Positive or negatively charged. C) Polar or non polar molecule. D) Neutral molecule or an ion. Show Answer Correct Answer: A) Acid or base. 49. The pH of a solution is 2.0. What is the [OH$^{-}$] concentration? A) 1x10$^{-2}$M. B) 1x10$^{-12}$M. C) 2 M. D) 12 M. Show Answer Correct Answer: B) 1x10$^{-12}$M. 50. Alkalis feel ..... A) Rough. B) Smooth. C) Soapy. D) Granulated. Show Answer Correct Answer: C) Soapy. 51. The purple colour of cabbage ..... when it is dipped in an acid A) Turns black. B) Disappears. C) Turns red. D) Remains as t is. Show Answer Correct Answer: C) Turns red. 52. The name of acid in lemon juice is A) Sulfuric acid. B) Ethanoic. C) Lemonic acid. D) Citric acid. Show Answer Correct Answer: D) Citric acid. 53. A strong acid is an acid that is ..... A) 100% ionizes in water. B) An electrolyte. C) Both. D) Neither. Show Answer Correct Answer: C) Both. 54. Which of the following is not the properties of alkalis? A) The pH scale of alkalis from 8-14. B) Slipery. C) Corrosive. D) Have a pH less than 7. Show Answer Correct Answer: D) Have a pH less than 7. 55. Turns litmus red A) Acids. B) Bases. C) All. D) None of the above. Show Answer Correct Answer: A) Acids. 56. Lemon juice is an example of ..... A) A base. B) An acid. C) A neutral substance. D) None of the above. Show Answer Correct Answer: B) An acid. 57. What are 2 types of nucleic acids? A) Fatty Acids and Glycerol. B) DNA and RNA. C) Amino Acids and Enzymes. D) Monosaccharides and Polysaccharides. Show Answer Correct Answer: B) DNA and RNA. 58. If an acid is combined with a base of equal strength, the result will most likely be A) A stronger acid. B) A neutral solution. C) A stronger base. D) Impossible to tell without testing the pH. Show Answer Correct Answer: B) A neutral solution. 59. Dry HCl gas dhanges the colour of dry blue litmus A) Dry blue litmus. B) Dry red litmus. C) Both. D) None. Show Answer Correct Answer: D) None. 60. Human blood has a pH between 7.35 and 7.45. Which of the following best describes human blood? A) Slightly acidic. B) Strongly basic. C) Strongly acidic. D) Slightly basic. Show Answer Correct Answer: D) Slightly basic. ← PreviousNext →Related QuizzesScience QuizzesClass 7 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 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