This quiz works best with JavaScript enabled. Home > Class 7 > Class 7 Science Chapter 4 Acids – Quiz 4 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 7 Science Chapter 4 Acids Quiz 4 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Acid base indicator for visually impaired child A) Litmus. B) Vanilla essence. C) Turmeric. D) Universal indicator. Show Answer Correct Answer: B) Vanilla essence. 2. Milk of magnesia contains ..... A) Sodium. B) Potassium. C) Magnesium. D) Ammonium. Show Answer Correct Answer: C) Magnesium. 3. 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. 4. Which of the following acids do we have in our stomach? A) Ethanoic acid. B) Hydrochloric acid. C) Nitric acid. D) Sulphuric acid. Show Answer Correct Answer: B) Hydrochloric acid. 5. What is the pH of water? A) 0. B) 4. C) 7. D) 14. Show Answer Correct Answer: C) 7. 6. 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. 7. Protein synthesis takes place in two parts: A) Transcription then translation. B) Replication then transcription. C) Translation then transcription. D) Replication then translation. Show Answer Correct Answer: A) Transcription then translation. 8. Common name of CaOCl2 A) Washing powder. B) Baking powder. C) Bleaching powder. D) Plaster of paris. Show Answer Correct Answer: C) Bleaching powder. 9. 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. 10. Salt of carbonic acid and zinc will be a A) Neural salt. B) Acidic salt. C) Basic salt. D) Not reacts. Show Answer Correct Answer: A) Neural salt. 11. 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. 12. According to the Arrhenius theory, an acid is a substance that A) Changes litmus from red to blue. B) Changes phenolphthalein from colorless to pink. C) Produces hydronium ions as the only positive ions in an aqueous solution. D) Produces hydroxide ions as the only negative ions in an aqueous solution. Show Answer Correct Answer: C) Produces hydronium ions as the only positive ions in an aqueous solution. 13. Which of the following phenomena occur when a small amount of acid is added to water? A) Ionisation. B) Neutralization. C) Dilution. D) Formation. Show Answer Correct Answer: C) Dilution. 14. The production of a protein is organized by which of the following organelles? A) Ribosome. B) Nucleus. C) Mitochondrion. D) Vesicle. Show Answer Correct Answer: A) Ribosome. 15. How many type of Litmus is there A) One. B) Zero. C) Five. D) Two. Show Answer Correct Answer: D) Two. 16. How many essential amino acids are there? A) 3. B) 9. C) 12. D) 20. Show Answer Correct Answer: B) 9. 17. Reaction of a carboxylic acid and sodium hydroxide will produce: A) A substituted ammonium salt. B) A substituted carbonate salt. C) A substituted water. D) A substituted carboxylates. Show Answer Correct Answer: D) A substituted carboxylates. 18. Which of the following is a chemical property of a base A) A slippery feel. B) Conducts an electric current. C) Turns red litmus paper blue. D) Forms hydronium ions in water. Show Answer Correct Answer: C) Turns red litmus paper blue. 19. 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. 20. 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. 21. Rakesh has applied turmeric on baking soda. Turmeric is an ..... A) Acid. B) Base. C) Salt. D) Neutral. E) Indicator. Show Answer Correct Answer: E) Indicator. 22. Which of the following gas is liberated when an acid reacts with a metal? A) Hydrogen. B) Nitrogen. C) Oxygen. D) Carbon dioxide. Show Answer Correct Answer: A) Hydrogen. 23. What color does litmus paper turn in the presence of an acid? A) Blue. B) Black. C) Green. D) Red. Show Answer Correct Answer: D) Red. 24. Name the acid:HNO$_{3}$ A) Hydronitrous acid. B) Hydronitric acid. C) Nitric acid. D) Nitrous acid. Show Answer Correct Answer: C) Nitric acid. 25. Chemical formula of sulphuric acid A) Hcl. B) HNI3. C) H2SO4. D) NONE OF THE ABOVE. Show Answer Correct Answer: C) H2SO4. ← PreviousNext →Related 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 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