This quiz works best with JavaScript enabled. Home > Class 7 > Class 7 Science Chapter 4 Acids – Quiz 26 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 7 Science Chapter 4 Acids Quiz 26 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. What colour do bases turn in china rosd indicator? A) Blue. B) Magenta. C) Green. D) Gray. Show Answer Correct Answer: C) Green. 2. Which compounds can be classified as acids? A) HCl and NaOH. B) HNO$_{3}$ and NaCl. C) NH$_{3}$ and H$_{2}$CO$_{3}$. D) HBr and H$_{2}$SO$_{4}$. Show Answer Correct Answer: D) HBr and H$_{2}$SO$_{4}$. 3. Potassium phtalamide is the reagent used for amino acid synthesis using A) Gabriel synthesis. B) Strecker synthesis. C) Merrifield synthesis. D) O donnell synthesis. Show Answer Correct Answer: A) Gabriel synthesis. 4. What is the pOH of a 1 x 10$^{-8}$ M solution of HNO$_{3}$? A) 8. B) 6. C) 7. D) 9. Show Answer Correct Answer: B) 6. 5. An acid is a chemical substance usually a ..... A) Liquid. B) Paste. C) Powder. D) Chemical. Show Answer Correct Answer: A) Liquid. 6. Olfactory indicators are:(a) Clove(b) Turmeric(c) Soap(d) Rose Petals A) A. B) B. C) C. D) D. Show Answer Correct Answer: A) A. 7. SUBSTANCES WHICH TASTE SOUR ARE A) ACIDS. B) BASES. C) INDICATORS. D) NONE OF THESE. Show Answer Correct Answer: A) ACIDS. 8. What does a base release when placed in water? A) Hydroxide ions (OH-). B) Hydrogen ions (H+). C) Ions. D) Molecules. Show Answer Correct Answer: A) Hydroxide ions (OH-). 9. What is the formula for permanganic acid? A) Hold. B) MnO$_{4}$$^{-}$. C) Hmno $ _ {4} $. D) H$_{2}$MnO$_{4}$. Show Answer Correct Answer: C) Hmno $ _ {4} $. 10. The range of pH scale is A) 0 to 7. B) 7 to 14. C) 1 to 14. D) 0 to 14. Show Answer Correct Answer: D) 0 to 14. 11. At what pH of our mouth, tooth decay occurs?? A) 5.5. B) Below 5.5. C) Above 5.5. D) Above 7. Show Answer Correct Answer: B) Below 5.5. 12. Pure water has a pH of 7. Pure water ..... A) Is a base. B) Is a neutral substance. C) Could be either an acid or a base. D) Is an acid. Show Answer Correct Answer: B) Is a neutral substance. 13. Indigestion tablets always contain A) Acids. B) Antacids. C) Antibiotics. D) Indicators. Show Answer Correct Answer: B) Antacids. 14. Select the name of the following acid:HCl A) Hydrochloric acid. B) Chlorous acid. C) Chloric acid. D) None of the above. Show Answer Correct Answer: A) Hydrochloric acid. 15. Are these statements about amino acids true or false?Peptide links can undergo hydrolysis by reflux with hydrochloric acid A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 16. What is the formula for hydrophosphoric acid A) H$_{3}$PO$_{4}$. B) H$_{3}$PO$_{3}$. C) H$_{3}$P. D) HP. Show Answer Correct Answer: C) H$_{3}$P. 17. Hydrobromic acid, HBr, is a strong acid. Hydrofluoric acid, HF, is a weak acid. If you prepared equal concentrations of both acids in separate containers which would be TRUE? A) The hydrobromic acid would only partially dissociate. B) Both solutions would have the same pH. C) The pH of hydrobromic acid would be less than the pH of hydrofluoric acid. D) The pH of hydrofluoric acid would be less than the pH of hydrobromic acid. Show Answer Correct Answer: C) The pH of hydrobromic acid would be less than the pH of hydrofluoric acid. 18. Bases turn Red litmus to ..... A) Green. B) Yellow. C) Blue. D) Black. Show Answer Correct Answer: C) Blue. 19. 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. 20. 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. 21. 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. 22. What element do all acids contain? A) H. B) O. C) C. D) He. Show Answer Correct Answer: A) H. 23. Plaster of Paris is made from A) Lime stone. B) Slaked Lime. C) Quick lime. D) Gypsum. Show Answer Correct Answer: D) Gypsum. 24. 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. 25. Setting of Plaster of Paris takes place due to A) Oxidation. B) Reduction. C) Dehydration. D) Hydration. Show Answer Correct Answer: D) Hydration. ← 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 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 9Class 7 Science Chapter 4 Acids Quiz 10 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books