This quiz works best with JavaScript enabled. Home > Class 7 > Class 7 Science Chapter 4 Acids – Quiz 6 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 7 Science Chapter 4 Acids Quiz 6 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. 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-arginine-threoinine-proline. D) Methionine-proline-arginine-threoinine. Show Answer Correct Answer: C) Methionine-arginine-threoinine-proline. 2. When acid is added to blue litmus paper the colour is A) Red. B) Blue. C) Green. D) Yellow. Show Answer Correct Answer: A) Red. 3. When the pH of your pool is too low, it can irritate your skin, what do you need to add to raise it A) Salt (e.g. sodium chloride). B) Chlorine. C) Hydrochloric acid. D) Sodium carbonate. Show Answer Correct Answer: D) Sodium carbonate. 4. A measure of hydronium ion concentration in a solution A) Balloon size. B) PH. C) Ph. D) Triple beam balance. Show Answer Correct Answer: B) PH. 5. The pH of pure water is A) 1. B) 5. C) 7. D) 11. Show Answer Correct Answer: C) 7. 6. An unknown substance was tested and found to have an extremely high concentration of hydroxide ions, OH$^{-}$. and very low concentration of hydronium ions, H$_{3}$O$^{+}$. Which pH would make the most sense? A) PH = 2. B) PH = 6. C) PH = 8. D) PH = 12. Show Answer Correct Answer: D) PH = 12. 7. The compounds obtained on heating baking soda are A) Sulphur dioxide and sodium carbonate. B) Sodium bicarbonate, water and carbon dioxide. C) Sodium carbonate, water and carbon dioxide. D) Hydrochloric acid and water. Show Answer Correct Answer: C) Sodium carbonate, water and carbon dioxide. 8. ..... is used for white washing A) Sodium hydroxide. B) Potassium hydroxide. C) Calcium carbonate. D) Calcium hydroxide. Show Answer Correct Answer: D) Calcium hydroxide. 9. Colour of blue litmus solution ..... when poured into ammonium hydroxide solution. A) Turns red. B) Turns green. C) Stays the same. D) Turns yellow. Show Answer Correct Answer: C) Stays the same. 10. The reaction between ammonium hydroxide and sulfuric acid is called A) Combustion. B) Synthesis. C) Precipitation. D) Neutralization. Show Answer Correct Answer: D) Neutralization. 11. To protect tooth decay, one is advised to brush the teeth regulary. The ingredient of the paste which checks tooth decay is: A) Acidic. B) Basic. C) Neutral. D) Corrosive. Show Answer Correct Answer: B) Basic. 12. True or false:bases are sometimes called alkaline. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 13. Fruits such as oranges, lemon etc, contain ..... Acid A) Citric. B) Lactic. C) Ascorbic. D) Acetic. Show Answer Correct Answer: A) Citric. 14. The colour of universal indicator in a substance that is very acidic is: A) Green. B) Orange. C) Purple. D) Red. Show Answer Correct Answer: D) Red. 15. Metallic oxides are basic in nature. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 16. Which of the following substances contain an alkali? A) Baking powder. B) Coca Cola. C) Distilled water. D) Vinegar. Show Answer Correct Answer: A) Baking powder. 17. Select the formula for the following acid:chloric acid A) HCLO $ _ {3} $. B) HCl. C) Hclo $ _ {4} $. D) None of the above. Show Answer Correct Answer: A) HCLO $ _ {3} $. 18. An acid A) Formed from joining positive and negative ions. B) Increases OH ions. C) Forms a salt and water. D) Increases H$_{3}$O+ ions. Show Answer Correct Answer: D) Increases H$_{3}$O+ ions. 19. Which elements are mostly found in proteins? A) C, H, O. B) C, H, O, N. C) C, H, O, N, P. D) C, H, O, N, S, Ca. Show Answer Correct Answer: B) C, H, O, N. 20. A dilute acid A) Can be either a strong or weak acid. B) Is a weak acid. C) Is a strong acid. D) A strong base. Show Answer Correct Answer: A) Can be either a strong or weak acid. 21. Acids aren't Corrosive. True or False? A) True. B) False. C) I don't know. D) None of the above. Show Answer Correct Answer: B) False. 22. OH$^{-}$ is called the: A) Hydrate ion. B) Hydrogen ion. C) Hydronium ion. D) Hydroxide ion. Show Answer Correct Answer: D) Hydroxide ion. 23. When naming oxyacids, change "-ite" to: A) -ate. B) -ic. C) -ous. D) -ite. Show Answer Correct Answer: C) -ous. 24. Which of the following is not a characteristic of a base? A) Feels slippery. B) Is an electrolyte. C) Tastes bitter. D) Reacts with a metal to form H gas. Show Answer Correct Answer: D) Reacts with a metal to form H gas. 25. Not a acidic salt A) COSO4. B) NH4CL. C) FeCl3. D) CH3Coon. Show Answer Correct Answer: D) CH3Coon. ← 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 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