1 Which concept defines an acid as an electron pair acceptor? A Arrhenius concept B Brønsted-Lowry concept C Lewis concept D Ostwald concept
3 Water acts as both an acid and a base. This property of water is called: A Neutralisation B Amphoteric nature C Hydrolysis D Ionisation
4 According to the Brønsted-Lowry concept, what is an acid? A A proton donor B A proton acceptor C An electron pair donor D An electron pair acceptor
5 According to the Lewis concept, an acid is a substance that: A donates a proton. B accepts a proton. C donates an electron pair. D accepts an electron pair.
6 Which reaction shows neutralization? A Acid + metal -> salt + hydrogen B Acid + base -> salt + water C Acid + carbonate -> salt + water + carbon dioxide D Base + metal -> salt + hydrogen
7 When an acid reacts with a metal carbonate, which gas is produced? A Hydrogen B Oxygen C Carbon dioxide D Nitrogen
8 What is formed when an acid reacts with a base? A Salt and water B Salt and hydrogen C Salt and carbon dioxide D Only water
9 Which indicator turns red in acidic solution and blue in basic solution? A Litmus B Methyl orange C Phenolphthalein D Universal indicator
10 A limitation of the Arrhenius concept is that it: A Cannot explain the basic nature of ammonia B Cannot explain acids in water C Requires a non-aqueous solvent D Only applies to strong acids
11 Which reaction occurs when an acid reacts with a metal carbonate? A Only salt and water are formed. B Salt, water and carbon dioxide are formed. C Only hydrogen gas is produced. D No reaction takes place.
13 Why are strong acids more dangerous to handle than weak acids of the same concentration? A They are always more concentrated B They ionize completely and release more H⁺ ions C They do not react with skin D They have higher pH
14 Which indicator is colorless in acidic solution and pink in basic solution? A Litmus B Phenolphthalein C Methyl orange D Universal indicator
15 Water is amphoteric because it can: A Only donate protons B Only accept protons C Both donate and accept protons D Neither donate nor accept protons
16 Acid rain is generally described as rain having a pH value: A Exactly 7 B Above 7 C Below 5.6 D Between 7 and 8
17 Which of the following is an example of a strong acid? A Acetic acid (CH3COOH) B Carbonic acid (H2CO3) C Hydrochloric acid (HCl) D Water (H2O)
18 Which of the following is a weak base? A Sodium hydroxide B Potassium hydroxide C Ammonia D Calcium hydroxide
19 Which concept defines an acid as a proton donor? A Arrhenius concept B Bronsted-Lowry concept C Lewis concept D Electron-pair concept
21 According to the Arrhenius concept, a base is a substance that: A Donates a proton B Accepts a proton C Produces OH- ions in water D Accepts an electron pair
22 Which of the following is a control measure to reduce acid rain? A Burning more coal B Using catalytic converters in vehicles C Increasing the use of fossil fuels D Adding more SO2 to the atmosphere
23 Which carbonate reacts with acid to produce carbon dioxide? A Calcium carbonate B Sodium chloride C Ammonium chloride D Copper sulfate
24 Which of the following is a property of bases? A They turn blue litmus red B They have a sour taste C They feel slippery to touch D They react with metals to produce hydrogen gas
25 A base that produces OH- ions in water is described by which concept? A Bronsted-Lowry concept B Lewis concept C Arrhenius concept D Proton-acceptor concept