This quiz works best with JavaScript enabled. Home > Cbse > Class 7 > Science > Acids > Class 7 Science Chapter 4 Acids – Quiz 11 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 7 Science Chapter 4 Acids Quiz 11 (60 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Bases turn Red litmus to ..... A) Yellow. B) Blue. C) Black. D) Green. Show Answer Correct Answer: B) Blue. 2. A neutralisation reaction is a reaction between A) Acid and a Base. B) Acid and water. C) Base and water. D) None of the above. Show Answer Correct Answer: A) Acid and a Base. 3. Indicators are natural dyes that indicate weather the given solution is ..... A) Acid. B) Base. C) Both of the above. D) None of the above. Show Answer Correct Answer: C) Both of the above. 4. The gas formed when an iron nail is put in hydrochloric acid is A) Hydrogen. B) Oxygen. C) Carbon dioxide. D) None of the above. Show Answer Correct Answer: A) Hydrogen. 5. What element do all acids contain? A) H. B) O. C) He. D) C. Show Answer Correct Answer: A) H. 6. Plaster of Paris is made from A) Quick lime. B) Slaked Lime. C) Lime stone. D) Gypsum. Show Answer Correct Answer: D) Gypsum. 7. Lakshmi is writing some statements about bases and indicators. Choose the correct statement and help her. A) Tooth decay is caused by the presence of a base. B) Indicator is a substance which shows different color in acidic and basic solution. C) Sodium Hydroxide turns blue Litmus red. D) All the above. Show Answer Correct Answer: B) Indicator is a substance which shows different color in acidic and basic solution. 8. Setting of Plaster of Paris takes place due to A) Oxidation. B) Dehydration. C) Hydration. D) Reduction. Show Answer Correct Answer: C) Hydration. 9. The pH scale measures ..... A) The strength of hydrogen ions. B) The concentration of hydrogen ions. C) The concentration of an acid. D) The strength of an acid. Show Answer Correct Answer: B) The concentration of hydrogen ions. 10. Are these statements about amino acids true or false?In the solid state amino acids exists as zwitterions A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 11. How does an Antacid help? A) It is harmful. It doesn't help in anything. B) To neutralize acidity in soil. C) To neutralize the effect of a bee sting. D) To correct excess acidity in stomach. Show Answer Correct Answer: D) To correct excess acidity in stomach. 12. Select the formula for the following acid:hydrobromic acid A) HBr. B) HRO $ _ {4} $. C) HRO $ _ {3} $. D) None of the above. Show Answer Correct Answer: A) HBr. 13. When a hydrogen ion is released what does the solution become? A) Basic. B) Acidic. C) Ampherteric. D) Proton. Show Answer Correct Answer: B) Acidic. 14. Sodium hydrogen carbonate is used in fire extinguisher. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 15. If a solution is basic which ion will be more present? A) K+. B) OH-. C) H-. D) H+. Show Answer Correct Answer: B) OH-. 16. Why must we conduct standardization? A) Determine the true molarity of a substance. B) To find out the concentration of an unknown acid we are titrating. C) Because it is a fun lab. D) To find the neutral point of combining an acid and base. Show Answer Correct Answer: A) Determine the true molarity of a substance. 17. When nitric acid is added to magnesium metal a reaction occurs and a gas is produced. The products of this reaction are: A) Magnesium nitrate and hydrogen gas. B) Magnesium carbonate and carbon dioxide. C) Magnesium chloride and hydrogen gas. D) Magnesium sulphate and carbon dioxide. Show Answer Correct Answer: A) Magnesium nitrate and hydrogen gas. 18. When using the Arrhenius model, what types of ions indicate that a compound is a base? A) H$^{+1}$. B) OH$^{-1}$. C) All the above. D) None of the above. Show Answer Correct Answer: B) OH$^{-1}$. 19. Hydrangea, Petunia and geranium are A) Synthetic indicator. B) Acid base indicators. C) Acid. D) Base. Show Answer Correct Answer: B) Acid base indicators. 20. When a Base is added to litmus paper it turns ..... A) Green. B) Blue. C) Red. D) Orange. Show Answer Correct Answer: B) Blue. 21. What does the word 'alkali' means A) The ashes. B) Burn. C) Sour. D) Bitter. Show Answer Correct Answer: A) The ashes. 22. Water can act as both an acid and a base according to the bronsted lowry model. This means water is A) Ionic. B) Conjugate. C) Ampherteric. D) Neutral. Show Answer Correct Answer: C) Ampherteric. 23. Carbonic acid (a) A) H $ _ {2} $ co $ _ {2} $. B) To.H2CO3. C) H $ _ {2} $ co $ _ {4} $. D) H$_{4}$C. Show Answer Correct Answer: B) To.H2CO3. 24. Produces a salt and water in a neutralization reaction A) Acid. B) Base. C) Both an acid and a base. D) None of the above. Show Answer Correct Answer: C) Both an acid and a base. 25. Where is Ruheman's purple seen? A) Ninhydrin reaction. B) Biuret Reaction. C) Dansyl chloride reaction. D) Benedict'ss reaction. Show Answer Correct Answer: A) Ninhydrin reaction. 26. If Copper sulphate pentahydrate is heated then, A) Crystal shape chnages. B) It becomes white. C) It becomes blue. D) None. Show Answer Correct Answer: B) It becomes white. 27. What type of solution does a base produce when dissolved in water? A) Neutral. B) Acidic. C) Salty. D) Basic. Show Answer Correct Answer: D) Basic. 28. What is the three base sequence of mRNA that codes for a single amino acid? A) Anticodon. B) Codon. C) Protein. D) None of the above. Show Answer Correct Answer: B) Codon. 29. What substance would do the best job of cleaning pots and pans? A) A substance with a pH of 4. B) A substance with a pH of 8. C) A substance with a pH of 7. D) A substance with a pH of 2. Show Answer Correct Answer: B) A substance with a pH of 8. 30. An acid can react with A) AgCl. B) We can. C) PbSO4. D) Na2so4. Show Answer Correct Answer: B) We can. 31. Which of the acids are called king of chemicals A) Nitric Acid. B) Vinegar(acetic acid). C) Sulphuric Acid. D) Hydrochloric Acid. Show Answer Correct Answer: C) Sulphuric Acid. 32. Can sodium hydroxide is used to manufacture paper and textiles A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 33. Which type of reaction is this? Base + Acid $\rightarrow$ Salt + Water A) Addition reaction. B) Displacement reaction. C) Neutralization reaction. D) Substitution reaction. Show Answer Correct Answer: C) Neutralization reaction. 34. Indicator that turns red in the presence of an acid and blue in the presence of a base A) Litmus. B) Solute. C) Solvent. D) Temperature. Show Answer Correct Answer: A) Litmus. 35. Non-meat examples of protein include A) Broccoli, kale, carrots. B) Beans, legumes, eggs. C) Tofu, apples, spinach. D) None of the above. Show Answer Correct Answer: B) Beans, legumes, eggs. 36. Where does translation take place? A) Cytoplasm. B) Golgi Body. C) Ribosome. D) Nucleus. Show Answer Correct Answer: C) Ribosome. 37. Steps or rungs of ladder, are made up of: A) Nitrogen containing bases that connect in center by weak hydrogen bonds. B) Nitrogen containing bases that connect in the center by carbohydrate bonds. C) Nitrogen containing bases that connect in the center by weak phosphate bonds. D) Nitrogen containing bases that connect in the center by strong phosphate bonds. Show Answer Correct Answer: A) Nitrogen containing bases that connect in center by weak hydrogen bonds. 38. How do acidic solutions taste? A) Sour. B) Sweet. C) Delicious. D) Bitter. Show Answer Correct Answer: A) Sour. 39. Zn(OH)$_{2}$ is an example of a ..... A) Salt. B) Water. C) Base. D) Acid. Show Answer Correct Answer: C) Base. 40. Soluble base in water is, A) Metallic oxide. B) Alkali. C) Metallic hydroxide. D) None of the above. Show Answer Correct Answer: B) Alkali. 41. Which has a pH below 7? A) Acid. B) Base. C) All the above. D) None of the above. Show Answer Correct Answer: A) Acid. 42. Which of the following particles is NOT present in a dilute aqueous solution of ammonia? A) OH$^{-}$. B) NH$_{4}$$^{+}$. C) NH$_{4}$OH. D) NH$_{3}$. Show Answer Correct Answer: C) NH$_{4}$OH. 43. Any substance that produces hydroxide ions in water is known as ..... A) A neutral. B) A base. C) An acid. D) A hydrogen ion. Show Answer Correct Answer: B) A base. 44. Litmus paper can tell you if a solution is acidic, neutral or basic by changing color when placed in a solution. If you test a base with litmus paper, it will turn ..... A) Purple. B) Red. C) Blue. D) Pink. Show Answer Correct Answer: C) Blue. 45. How do we test for hydrogen? A) Squeaky pop test. B) Hydrogen makes a glowing splint relight. C) Hydrogen extinguishes a lit splint. D) Bubbling through lime water. Show Answer Correct Answer: A) Squeaky pop test. 46. Select the name for the following acid:H$_{2}$S A) Hydrosulfuric acid. B) Sulfuric acid. C) Sulfurous. D) None of the above. Show Answer Correct Answer: A) Hydrosulfuric acid. 47. What is the pH of an extremely strong acid? A) PH 7. B) PH 2. C) PH 0. D) PH 13. Show Answer Correct Answer: B) PH 2. 48. According to the pH scale, indicator will turn red if a solution is A) Bored. B) Alkali. C) Acidic. D) Neutral. Show Answer Correct Answer: C) Acidic. 49. What are properties of acids? A) Bitter, slippery, ph above 7. B) Sour, reacts with metals, ph below 7. C) Sour, reacts with metals, ph above 7. D) Bitter, ph of 7, does not react with metals. Show Answer Correct Answer: B) Sour, reacts with metals, ph below 7. 50. What do acids and bases have in common? A) They both eat away at metal. B) They can both conduct electricity. C) They both have a sour taste. D) They both form positively charged ions when dissolved in water. Show Answer Correct Answer: B) They can both conduct electricity. 51. True or False.A hydrogen ion H$^{+}$ is also known as a proton. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 52. Number of chromosomes in human beings A) 23 pairs. B) 22 pairs. C) 23. D) 40. Show Answer Correct Answer: A) 23 pairs. 53. In RNA, uracil takes the place of the DNA nitrogen base called A) Guanine. B) Cytosine. C) Adenine. D) Thymine. Show Answer Correct Answer: D) Thymine. 54. Which substance is used in automobile battery? A) Sulphuric acid. B) Vinegar. C) Sodium hydroxide. D) Citric acid. Show Answer Correct Answer: A) Sulphuric acid. 55. Sodium hydroxide is used A) In alkaline batteries. B) In manufacture of soap. C) As an antacid. D) As a cleansing agent. Show Answer Correct Answer: B) In manufacture of soap. 56. Which of these is not found in DNA? A) Adenine. B) Phosphate. C) Thymine. D) Within limits. Show Answer Correct Answer: D) Within limits. 57. A substance is found to have the following characteristics:Very bitter taste Feels slippery to the touch Produces OH-ions when dissolved in water In what category would the substance be classified? A) Acid. B) Fatty acid. C) Base. D) Enzyme. Show Answer Correct Answer: C) Base. 58. What is the pH range of an acid? A) 4-6. B) 8-14. C) 1-6. D) 1-7. Show Answer Correct Answer: C) 1-6. 59. What is the first use of mineral acid? A) To separate silver and gold. B) To hurt people. C) To produce cleaning product. D) To separate acids and alkalis. Show Answer Correct Answer: A) To separate silver and gold. 60. What is the name of H$_{2}$SO$_{3}$? A) Hydrosulfuric Acid. B) Sulfurous Acid. C) Sulfuric Acid. D) Hydrosulfurous Acid. Show Answer Correct Answer: B) Sulfurous Acid. ← 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 5Class 7 Science Chapter 4 Acids Quiz 6Class 7 Science Chapter 4 Acids Quiz 7Class 7 Science Chapter 4 Acids Quiz 8 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books