1 Acid rain is mainly caused by the presence of which gases in the atmosphere? A CO2 and O2 B SO2 and NOx C CH4 and H2 D N2 and O2
3 Which property is typical of acids? A They taste sour B They taste bitter C They feel slippery D They turn red litmus blue
4 Which control measure reduces acid rain? A Increasing SO₂ emissions B Using low-sulfur fuel C Burning more coal D Adding more NOx to the air
5 Acid rain damages buildings made of marble mainly because marble contains: A Calcium carbonate B Sodium chloride C Iron oxide D Silicon dioxide
6 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
7 Down a group, the ionisation energy generally: A Increases B Decreases C Remains constant D Becomes zero
8 Along a period from left to right, the metallic character of elements: A Increases B Decreases C Remains unchanged D Shows no trend
9 Which property is typical of bases? A They taste sour B They turn blue litmus red C They feel slippery D They release H⁺ ions in water
10 Which reaction produces a salt and water? A Acid + metal B Acid + carbonate C Acid + base D Acid + acid
11 As we move down a group, atomic size: A Increases B Decreases C Remains the same D First increases then decreases
12 As we move from left to right across a period, the atomic size of elements generally: A increases B decreases C remains the same D first increases then decreases
14 According to Arrhenius, an acid is a substance that: A Accepts a proton B Donates a proton C Produces H+ ions in water D Produces OH- ions in water
15 According to Moseley, the modern periodic table is based on which property of elements? A Atomic mass B Atomic number C Density D Valency
16 Which of the following is a weak base? A Sodium hydroxide B Potassium hydroxide C Ammonia D Calcium hydroxide
17 Which group of the periodic table contains the halogens? A Group 1 B Group 2 C Group 17 D Group 18
18 The elements of Group 17 are known as: A Alkali metals B Halogens C Noble gases D Transition metals
19 In the modern periodic table, elements are arranged in order of increasing: A Atomic mass B Atomic number C Density D Melting point
20 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
21 As we move from left to right across a period, the atomic size generally: A Increases B Decreases C Remains constant D First increases then decreases
22 Which of the following is the most reactive metal in the reactivity series? A Sodium B Potassium C Magnesium D Copper
23 Which group of elements in the periodic table is known as the alkali metals? A Group 1 B Group 2 C Group 17 D Group 18
24 In the reaction NH₃ + H₂O ⇌ NH₄⁺ + OH⁻, water acts as a: A Proton donor B Proton acceptor C Electron pair donor D Lewis acid
25 Which property is shown by acids when they react with metals such as zinc? A Hydrogen gas is produced B Oxygen gas is produced C Carbon dioxide gas is produced D Chlorine gas is produced