This quiz works best with JavaScript enabled. Home > Class 7 > Class 7 Science Chapter 4 Salts – Quiz 31 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 7 Science Chapter 4 Salts Quiz 31 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. What is the chemical formulae for Nitric acid? A) H$_{2}$SO$_{4}$. B) HNO$_{3}$. C) HCl. D) None of the above. Show Answer Correct Answer: B) HNO$_{3}$. 2. A substance with a ph of lower than 7 is a A) Acid. B) Threaten and. C) Base. D) Salt. Show Answer Correct Answer: A) Acid. 3. Which of the following shows the correct dissolution reaction for BaCl$_{2}$ as related to K$_{sp}$? A) BaCl$_{2}$(s) $\rightarrow$ Ba $^{2+}$(aq) + Cl$_{2}$$^{-}$(aq). B) BadCl$_{2}$(aq) $\rightarrow$ F $^{2+}$(aq) + 2Cl$^{-}$(aq). C) BadCl$_{2}$(s) $\rightarrow$ F $^{2+}$(aq) + 2Cl$^{-}$(aq). D) Bad $^{2+}$(aq) + 2Cl$^{-}$(aq) $\rightarrow$ BaCl$_{2}$(s). Show Answer Correct Answer: C) BadCl$_{2}$(s) $\rightarrow$ F $^{2+}$(aq) + 2Cl$^{-}$(aq). 4. Slaked lime and quick line respectively is A) Calcium Hydroxide and Calcium oxide. B) Calcium oxide AND Calcium Hydroxide. C) Both. D) None. Show Answer Correct Answer: A) Calcium Hydroxide and Calcium oxide. 5. State whether the following compound is soluble or insoluble. Potassium bromide KBr A) Soluble. B) Insoluble. C) All the above. D) None of the above. Show Answer Correct Answer: A) Soluble. 6. Acid + Carbonate $\rightarrow$ A) Salt + hydrogen. B) Salt + water + carbon dioxide. C) Salt + water. D) Salt + carbon dioxide. Show Answer Correct Answer: B) Salt + water + carbon dioxide. 7. What is the oxidation number of a Nitrogen in the compound HNO2? A) +3. B) +2. C) +5. D) None of the above. Show Answer Correct Answer: A) +3. 8. Which two chemicals could you react to make only potassium chloride and water? A) Potassium and hydrochloric acid. B) Potassium hydroxide and hydrochloric acid. C) Potassium oxide and sulfuric acid. D) Potassium and sulfuric acid. Show Answer Correct Answer: B) Potassium hydroxide and hydrochloric acid. 9. Copper sulphate is also known as A) Oil of vitriol. B) Blue vitriol. C) All the above. D) None of the above. Show Answer Correct Answer: B) Blue vitriol. 10. Metal + Steam yields ..... A) Metal Oxide + Hydrogen. B) Metal Hydroxide + Hydrogen. C) A + B. D) Metal Oxide. Show Answer Correct Answer: B) Metal Hydroxide + Hydrogen. 11. Sodium hydroxide when exposed to the atmosphere at ordinary temperature, absorb moisture from atmosphere to become moist and ultimately dissolve in water to form a solution. What property is being exhibited by sodium hydroxide A) Diiquescence. B) Hygroscopic. C) Efflorescence. D) Dehydration. Show Answer Correct Answer: A) Diiquescence. 12. A student wants to make a basic salt. which of the following pairs of acid and base should he use. A) HCl + NaOH. B) H $ _ {2} $ Co $ _ {3} $ noe. C) HCl + NH$_{4}$OH. D) H$_{2}$SO$_{4}$ + K0H. Show Answer Correct Answer: B) H $ _ {2} $ Co $ _ {3} $ noe. 13. When a solution is basic phenolphthalein gives a ..... colour. A) Blue. B) Yellow. C) Pink. D) Red. Show Answer Correct Answer: C) Pink. 14. What is the correctly written chemical formula for the ionic compound, strontium oxide? A) Sr $ _ {2} $ o. B) SrO$_{2}$. C) Sr $ _ {2} $ o $ _ {2} $. D) SrO. Show Answer Correct Answer: D) SrO. 15. Ammonium Hydroxide is present in: A) Lime water. B) Soap. C) Ant's Sting. D) Window Cleaner. Show Answer Correct Answer: D) Window Cleaner. 16. State a reason why filtration is carried out during the preparation of Copper (II) sulphate when copper (II) oxide is added to dilute Sulphuric (VI)? A) To dry Copper (II) Sulphate. B) To remove water. C) To remove unreacted Copper (II) oxide. D) To speed up the rate of reaction. Show Answer Correct Answer: C) To remove unreacted Copper (II) oxide. 17. Substance which indicate if a substance is acid or basic is called a ..... A) China rose petals. B) Indicators. C) Turmeric. D) All of these. Show Answer Correct Answer: B) Indicators. 18. WHAT ARE INDICATORS? A) Indicators are the substances which when added in a solution show a change in colour, indicating whether it is an acidic or basic solution. B) Indicators are sour in taste. C) Indicators are bitter in taste. D) None of the above. Show Answer Correct Answer: A) Indicators are the substances which when added in a solution show a change in colour, indicating whether it is an acidic or basic solution. 19. Read the following and answer the question. A factory releases all it's waste, that is, harmful acids into bodies of water.The waste needs to be released immediately. But, there are organisms living inside the water too. Which one of these is the correct solution? A) Clear out all living organisms inside the body of water. Then, release the factory waste. B) Release all the waste immediately. C) Add Bases to neutralise the waste. D) None of the above. Show Answer Correct Answer: C) Add Bases to neutralise the waste. 20. Which is not a property of acids? A) These are sour to taste. B) Acids turn blue litmus red. C) Acids do not change the colour of turmeric indicator. D) With china rose indicator, these give dark pink colour. E) Acids turn red litmus blue. Show Answer Correct Answer: E) Acids turn red litmus blue. 21. If K < Q, which part of the reaction will speed up? A) Dissolution. B) Precipitation. C) None. D) None of the above. Show Answer Correct Answer: B) Precipitation. 22. What is the test for Hydrogen gas? A) Squeaky pop. B) Lime water turning cloudy. C) Add pH paper. D) None of the above. Show Answer Correct Answer: A) Squeaky pop. 23. Acid reacts with carbonates to form salt, water and ..... A) Carbon dioxide gas. B) Oxygen gas. C) Hydrogen gas. D) Metal carbonate. Show Answer Correct Answer: A) Carbon dioxide gas. 24. Which substance is a base? A) Sodium chloride. B) Zinc sulphate. C) Carbon dioxide. D) Magnesium oxide. Show Answer Correct Answer: D) Magnesium oxide. 25. What is the word equation for Neutralization? A) Acid + Alkali $\rightarrow$ Salt + Water. B) Acid + Carbonate $\rightarrow$ Salt + Water + Carbon Dioxide. C) Acid + Alkali $\rightarrow$ Salt + Water + Carbon Dioxide. D) Acid + Carbonate $\rightarrow$ Salt + Water. Show Answer Correct Answer: A) Acid + Alkali $\rightarrow$ Salt + Water. ← PreviousNext →Related QuizzesClass 7 Science Chapter 4 Salts Quiz 1Class 7 Science Chapter 4 Salts Quiz 2Class 7 Science Chapter 4 Salts Quiz 3Class 7 Science Chapter 4 Salts Quiz 4Class 7 Science Chapter 4 Salts Quiz 5Class 7 Science Chapter 4 Salts Quiz 6Class 7 Science Chapter 4 Salts Quiz 7Class 7 Science Chapter 4 Salts Quiz 8Class 7 Science Chapter 4 Salts Quiz 9Class 7 Science Chapter 4 Salts Quiz 10 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books