This quiz works best with JavaScript enabled. Home > Class 7 > Class 7 Science Chapter 4 Acids – Quiz 3 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 7 Science Chapter 4 Acids Quiz 3 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. A colourless and odourless gas is liberated when hydrochloric acid is added to a solution of washing soda. The name of the gas is A) Carbon dioxide. B) Nitrogen dioxide. C) Sulphur dioxide. D) Sulphur trioxide. Show Answer Correct Answer: A) Carbon dioxide. 2. Identify the true statement about the following reaction:F$^{-}$ + H$_{2}$O $\rightarrow$ HF +OH$^{-}$ A) H$_{2}$O is a bronsted lowry base. B) H$_{2}$O is not an acid or base according to either model. C) H$_{2}$O is a bronsted lowry acid. D) H$_{2}$O is an arrhenius acid. Show Answer Correct Answer: C) H$_{2}$O is a bronsted lowry acid. 3. Which among the following is not a base? A) NaOH. B) KOH. C) HCl. D) NH$_{4}$OH. Show Answer Correct Answer: C) HCl. 4. Acids are ..... to taste. A) Sweet. B) Sour. C) Bitter. D) All of these. Show Answer Correct Answer: B) Sour. 5. Complete the following reaction:Hydrochloric acid + magnesium hydroxide $\rightarrow$ A) Magnesium chloride + water. B) Magnesium + water. C) Magnesium chloride + hydrogen gas. D) Magnesium chloride + water + carbon dioxide. Show Answer Correct Answer: A) Magnesium chloride + water. 6. Which of the following base is used in the manufacture of bleaching powder? A) Sodium hydroxide. B) Calcium hydroxide. C) Potassium hydroxide. D) Magnesium hydroxide. Show Answer Correct Answer: B) Calcium hydroxide. 7. If a litmus paper does not change color (stays red or blue), the solution is- A) An Acid. B) A Base. C) Neutral. D) None of the above. Show Answer Correct Answer: C) Neutral. 8. Reaction between acid and alkali producing salt and water: A) Combustion. B) Neutralization. C) Precipitation. D) Decomposition. Show Answer Correct Answer: B) Neutralization. 9. Who were the alchemists? A) A group of people who didn't trust a guy named Al. B) A group of people long ago who tried to turn ordinary metal into gold using different liquids and experimentation. C) A band. D) A group of scientists in the 1950's who created penicillin. Show Answer Correct Answer: B) A group of people long ago who tried to turn ordinary metal into gold using different liquids and experimentation. 10. Which option below places the pH values in the correct order, from WEAKEST ACID to STRONGEST ACID? A) 1, 4, 5, 6. B) 6, 4, 3, 1. C) 7, 9, 11, 14. D) 13, 12, 10, 8. Show Answer Correct Answer: B) 6, 4, 3, 1. 11. Incorrect statement about acids is/are A) They have bitter taste. B) They changes the colour or red litmus to blue. C) They changes the colour or blue litmus to red. D) All above. Show Answer Correct Answer: C) They changes the colour or blue litmus to red. 12. Calcium carbonate + sulphuric acid $\rightarrow$ A) Calcium hydroxide, carbon dioxide and water. B) Acid rain. C) Calcium sulphate and hydrogen. D) Calcium sulphate, carbon dioxide and water. Show Answer Correct Answer: D) Calcium sulphate, carbon dioxide and water. 13. Methyl Orange Index Color in Acid Solutions ..... A) Yellow. B) Green. C) Orange. D) Red. Show Answer Correct Answer: D) Red. 14. A salt is formed when nitric acid combines with sodium hydroxide. What are present in the salt that forms? A) Sodium chloride. B) Sodium ions and nitrate ions. C) Only sodium ions. D) Only nitrate ions. Show Answer Correct Answer: B) Sodium ions and nitrate ions. 15. An acid reacts with a metal carbonate to produce A) Salt, water and hydrogen gas. B) Salt, water and carbon dioxide. C) Limewater. D) Salt and water. Show Answer Correct Answer: B) Salt, water and carbon dioxide. 16. Methyl orange added to soda water A) Turns blue. B) Turns purple. C) Turns red. D) Turns green. Show Answer Correct Answer: C) Turns red. 17. In the following chemical equation, which compound is the acid?HCl + NH$_{3 }$$\rightarrow$ NH$_{4}$$^{+ }$+ Cl$^{-}$ A) HCl. B) NH$_{3}$. C) NH$_{4}$$^{+}$. D) Cl$^{-}$. Show Answer Correct Answer: A) HCl. 18. Why are some acids used in food? A) To sweeten the food. B) To make it salty. C) So there will be a sour taste. D) So there will be a bitter taste. Show Answer Correct Answer: C) So there will be a sour taste. 19. What is the main function of ATP? A) When the body breaks down proteins, carbohydrates, and lipids to create energy for our body to function. B) Copies DNA. C) Transports Molecules. D) Carrier of genetic information. Show Answer Correct Answer: A) When the body breaks down proteins, carbohydrates, and lipids to create energy for our body to function. 20. What nucleotide base does RNA contain that DNA does not? A) Adenine (A). B) Cytosine (C). C) Uracil (u). D) Thymine (T). Show Answer Correct Answer: C) Uracil (u). 21. Which of the following ias an example of alkali A) Vinegar. B) Nitric acid. C) Calcium hydroxide. D) Hydrochloric acid. Show Answer Correct Answer: C) Calcium hydroxide. 22. Ammonium chloride (NH$_{4}$Cl) is a A) Weak Acid. B) Weak Base. C) Strong Acid. D) Strong base. Show Answer Correct Answer: A) Weak Acid. 23. Nucleic Acids are made of A) CHO. B) CHON. C) Lame. D) CHONS. Show Answer Correct Answer: C) Lame. 24. When placed in oil hydrophilic amino acids are A) Attracted to hydrophobic molecules. B) Attracted to each other. C) Attracted to the outside of the protein. D) Attracted to other hydrophobic side chains. Show Answer Correct Answer: B) Attracted to each other. 25. What is the concentration of H$^{+}$ in pure water? A) 1 x 10$^{-13}$ moles/liter. B) 1 x 10$^{-14}$ moles/liter. C) 1 x 10$^{-7}$ moles/liter. D) 1 x 10$^{7}$ moles/liter. Show Answer Correct Answer: C) 1 x 10$^{-7}$ moles/liter. ← PreviousNext →Related QuizzesClass 7 Science Chapter 4 Acids Quiz 1Class 7 Science Chapter 4 Acids Quiz 2Class 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 10Class 7 Science Chapter 4 Acids Quiz 11 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books