This quiz works best with JavaScript enabled. Home > Cbse > Class 7 > Science > Acids > Class 7 Science Chapter 4 Acids – Quiz 2 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 7 Science Chapter 4 Acids Quiz 2 (60 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. In the following chemical equation, which compound is the acid?HCl + NH$_{3 }$$\rightarrow$ NH$_{4}$$^{+ }$+ Cl$^{-}$ A) NH$_{3}$. B) HCl. C) NH$_{4}$$^{+}$. D) Cl$^{-}$. Show Answer Correct Answer: B) HCl. 2. Why are some acids used in food? A) To make it salty. B) So there will be a bitter taste. C) So there will be a sour taste. D) To sweeten the food. Show Answer Correct Answer: C) So there will be a sour taste. 3. What is the main function of ATP? A) When the body breaks down proteins, carbohydrates, and lipids to create energy for our body to function. B) Copies DNA. C) Transports Molecules. D) Carrier of genetic information. Show Answer Correct Answer: A) When the body breaks down proteins, carbohydrates, and lipids to create energy for our body to function. 4. What nucleotide base does RNA contain that DNA does not? A) Thymine (T). B) Adenine (A). C) Uracil (u). D) Cytosine (C). Show Answer Correct Answer: C) Uracil (u). 5. Which of the following ias an example of alkali A) Hydrochloric acid. B) Vinegar. C) Calcium hydroxide. D) Nitric acid. Show Answer Correct Answer: C) Calcium hydroxide. 6. Ammonium chloride (NH$_{4}$Cl) is a A) Weak Acid. B) Strong Acid. C) Weak Base. D) Strong base. Show Answer Correct Answer: A) Weak Acid. 7. Nucleic Acids are made of A) CHO. B) CHON. C) CHONS. D) Lame. Show Answer Correct Answer: D) Lame. 8. When placed in oil hydrophilic amino acids are A) Attracted to each other. B) Attracted to the outside of the protein. C) Attracted to other hydrophobic side chains. D) Attracted to hydrophobic molecules. Show Answer Correct Answer: A) Attracted to each other. 9. What is the concentration of H$^{+}$ in pure water? A) 1 x 10$^{7}$ moles/liter. B) 1 x 10$^{-7}$ moles/liter. C) 1 x 10$^{-14}$ moles/liter. D) 1 x 10$^{-13}$ moles/liter. Show Answer Correct Answer: B) 1 x 10$^{-7}$ moles/liter. 10. Acid base indicator for visually impaired child A) Turmeric. B) Vanilla essence. C) Litmus. D) Universal indicator. Show Answer Correct Answer: B) Vanilla essence. 11. Milk of magnesia contains ..... A) Ammonium. B) Magnesium. C) Sodium. D) Potassium. Show Answer Correct Answer: B) Magnesium. 12. Acid reacts with Metal to form ..... A) Hydrogen Gas. B) Salt and Hydrogen gas. C) Salt and water. D) Water. Show Answer Correct Answer: B) Salt and Hydrogen gas. 13. Which of the following acids do we have in our stomach? A) Hydrochloric acid. B) Sulphuric acid. C) Ethanoic acid. D) Nitric acid. Show Answer Correct Answer: A) Hydrochloric acid. 14. What is the pH of water? A) 0. B) 14. C) 4. D) 7. Show Answer Correct Answer: D) 7. 15. Rain is called acid rain when its: A) PH falls below 7. B) PH falls below 6. C) PH falls below 5.6. D) PH above 7. Show Answer Correct Answer: C) PH falls below 5.6. 16. Protein synthesis takes place in two parts: A) Translation then transcription. B) Replication then translation. C) Transcription then translation. D) Replication then transcription. Show Answer Correct Answer: C) Transcription then translation. 17. Common name of CaOCl2 A) Baking powder. B) Washing powder. C) Bleaching powder. D) Plaster of paris. Show Answer Correct Answer: C) Bleaching powder. 18. When a small piece of sodium is added to water, A) It will explodes with fire. B) Vigorous movement of metal piece. C) Change the phenolphthalein added into pink. D) All of the above. Show Answer Correct Answer: D) All of the above. 19. Salt of carbonic acid and zinc will be a A) Not reacts. B) Acidic salt. C) Neural salt. D) Basic salt. Show Answer Correct Answer: C) Neural salt. 20. Natural indicators A) Turmeric and red cabbage leaves. B) Phenolphthalein. C) Methyl orange. D) Turmeric and methyl orange. Show Answer Correct Answer: A) Turmeric and red cabbage leaves. 21. According to the Arrhenius theory, an acid is a substance that A) Changes phenolphthalein from colorless to pink. B) Produces hydroxide ions as the only negative ions in an aqueous solution. C) Produces hydronium ions as the only positive ions in an aqueous solution. D) Changes litmus from red to blue. Show Answer Correct Answer: C) Produces hydronium ions as the only positive ions in an aqueous solution. 22. Which of the following phenomena occur when a small amount of acid is added to water? A) Neutralization. B) Ionisation. C) Dilution. D) Formation. Show Answer Correct Answer: C) Dilution. 23. The production of a protein is organized by which of the following organelles? A) Vesicle. B) Mitochondrion. C) Ribosome. D) Nucleus. Show Answer Correct Answer: C) Ribosome. 24. How many type of Litmus is there A) Zero. B) Five. C) Two. D) One. Show Answer Correct Answer: C) Two. 25. How many essential amino acids are there? A) 12. B) 3. C) 9. D) 20. Show Answer Correct Answer: C) 9. 26. Reaction of a carboxylic acid and sodium hydroxide will produce: A) A substituted carbonate salt. B) A substituted ammonium salt. C) A substituted water. D) A substituted carboxylates. Show Answer Correct Answer: D) A substituted carboxylates. 27. Which of the following is a chemical property of a base A) A slippery feel. B) Turns red litmus paper blue. C) Conducts an electric current. D) Forms hydronium ions in water. Show Answer Correct Answer: B) Turns red litmus paper blue. 28. Metals and acids react to form ..... A) Salt and hydrogen. B) Salt and water. C) Carbon dioxide, salt and water. D) Hydrogen only. Show Answer Correct Answer: A) Salt and hydrogen. 29. There are acids and base in our body A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 30. Rakesh has applied turmeric on baking soda. Turmeric is an ..... A) Base. B) Acid. C) Neutral. D) Salt. E) Indicator. Show Answer Correct Answer: E) Indicator. 31. Which of the following gas is liberated when an acid reacts with a metal? A) Hydrogen. B) Nitrogen. C) Carbon dioxide. D) Oxygen. Show Answer Correct Answer: A) Hydrogen. 32. What color does litmus paper turn in the presence of an acid? A) Green. B) Blue. C) Red. D) Black. Show Answer Correct Answer: C) Red. 33. Name the acid:HNO$_{3}$ A) Nitric acid. B) Nitrous acid. C) Hydronitrous acid. D) Hydronitric acid. Show Answer Correct Answer: A) Nitric acid. 34. Chemical formula of sulphuric acid A) Hcl. B) HNI3. C) H2SO4. D) NONE OF THE ABOVE. Show Answer Correct Answer: C) H2SO4. 35. An alkali is able to "cancel" out an acid. This process is also known as? A) Neutralization. B) Balancing. C) Extraction. D) Overcome. Show Answer Correct Answer: A) Neutralization. 36. What do we label a material or substance that falls at 7 on the pH scale? A) Young. B) Happy. C) Acid. D) Neutral. Show Answer Correct Answer: D) Neutral. 37. ..... are composed out of carbon (C), hydrogen (H), oxygen (O), nitrogen (N), and phosphorus (P) A) Carbohydrates. B) Lipids. C) Nucleic Acids. D) Proteins. Show Answer Correct Answer: C) Nucleic Acids. 38. When the soil is too basic, plants do not grow well in it. To improve its quality what must be added to the soil? A) Organic matter. B) Calamine solution. C) Quick lime. D) Slaked lime. Show Answer Correct Answer: A) Organic matter. 39. Sulfuric acid (a) A) H$_{2}$SiO$_{3}$. B) H$_{2}$SO$_{3}$. C) A. H2SO4. D) H$_{2}$S. Show Answer Correct Answer: C) A. H2SO4. 40. In the folding of proteins, the amino acids that are hydrophilic will A) Move to the outside. B) Move to the inside. C) Not change. D) Stay in the middle. Show Answer Correct Answer: A) Move to the outside. 41. What happens when an acid and a base mix? A) Optimization. B) Equalization. C) Neutralization. D) Nebulization. Show Answer Correct Answer: C) Neutralization. 42. The color of litmus in neutral solution: A) Green. B) Red. C) Blue. D) Purple. Show Answer Correct Answer: D) Purple. 43. Name the acid:H$_{3}$PO$_{3}$ A) Phosphorous acid. B) Hydrophosphoric acid. C) Phosphoric acid. D) Phosphoric hydroxide. Show Answer Correct Answer: A) Phosphorous acid. 44. What two substance are formed when an acid and alkali react together in equal amounts? A) Salt and water. B) Alkali and water. C) Acid and water. D) Acid and alkali. Show Answer Correct Answer: A) Salt and water. 45. What completely ionizes in solution? A) Weak acids. B) Strong Salts. C) Neutral salts. D) Strong acids. Show Answer Correct Answer: D) Strong acids. 46. IF YOU DIP RED LITMUS PAPER INTO A SOLUTION AND IT TURNS BLUE. THE SOLUTION IS A) NUETRAL. B) ACID. C) BASE. D) NONE OF THESE. Show Answer Correct Answer: C) BASE. 47. Which of the following is a base? A) Vinegar. B) Baking soda in water. C) Lemonade. D) Orange juice. Show Answer Correct Answer: B) Baking soda in water. 48. What is the chemical formula of Sodium Hydroxide? A) NACL. B) Nacl. C) NaCL. D) NaCl. Show Answer Correct Answer: D) NaCl. 49. What is the formula for Acetic Acid? A) HCO. B) CH$_{3}$COO. C) HC$_{2}$H$_{3}$O$_{2}$. D) HCH $ _ {3} $ O $ _ {2} $. Show Answer Correct Answer: C) HC$_{2}$H$_{3}$O$_{2}$. 50. The nature of an antacid is A) Neutral. B) Ampherteric. C) Acidic. D) Basic. Show Answer Correct Answer: D) Basic. 51. What is the formula for hydrobromic acid? A) HBr. B) HBrO. C) HRO $ _ {3} $. D) HRO $ _ {2} $. Show Answer Correct Answer: A) HBr. 52. What substance could you use to test if a substance is an acid or alkali? A) Salt. B) Catalyst. C) Indicator. D) Water. Show Answer Correct Answer: C) Indicator. 53. What colour is pH neutral? A) Green. B) Red. C) Orange. D) Yellow. Show Answer Correct Answer: A) Green. 54. Bases turn yellow turmeric paper to ..... A) Orange. B) Green. C) Pink. D) Red. Show Answer Correct Answer: D) Red. 55. Amino acids all have the same general structure except for the: A) 'R' Group. B) Carboxyl Group. C) Amino Group. D) Carbonyl Group. Show Answer Correct Answer: A) 'R' Group. 56. Which is not a base? A) Sodium hydroxide. B) Vinegar. C) Magnesium hydroxide. D) Ammonium hydroxide. Show Answer Correct Answer: B) Vinegar. 57. Any substance that gives a visible sign, usually by a colour change A) Isolated. B) Helium. C) Indicator. D) Independent. Show Answer Correct Answer: C) Indicator. 58. Use your codon chart to answer the following question:AUG AGA ACG CCGWhat is the amino acid sequence from the mRNA above? A) Methionine-arginine-proline-threoinine. B) Methionine-alanine-threoinine-proline. C) Methionine-proline-arginine-threoinine. D) Methionine-arginine-threoinine-proline. Show Answer Correct Answer: D) Methionine-arginine-threoinine-proline. 59. When acid is added to blue litmus paper the colour is A) Blue. B) Green. C) Yellow. D) Red. Show Answer Correct Answer: D) Red. 60. When the pH of your pool is too low, it can irritate your skin, what do you need to add to raise it A) Hydrochloric acid. B) Sodium carbonate. C) Salt (e.g. sodium chloride). D) Chlorine. Show Answer Correct Answer: B) Sodium carbonate. ← PreviousNext →Related QuizzesScience QuizzesClass 7 QuizzesClass 7 Science Chapter 4 Acids Quiz 1Class 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