1 Elements in the same group of the periodic table have similar chemical properties because they have the same: A Number of shells B Number of valence electrons C Atomic mass D Number of neutrons
2 Elements of a group have the same: A Number of shells B Number of valence electrons C Atomic mass D Number of neutrons
3 The tendency of an atom to attract a shared pair of electrons towards itself is called: A Ionisation energy B Electron affinity C Electronegativity D Atomic radius
4 Which gas is a major contributor to acid rain along with sulfur dioxide? A Carbon monoxide (CO) B Nitrogen oxides (NOₓ) C Methane (CH₄) D Ozone (O₃)
5 Which block of the periodic table contains the alkali metals? A s-block B p-block C d-block D f-block
6 Which of the following alkali metals is the most reactive? A Lithium B Sodium C Potassium D Rubidium
7 The most reactive metals are found in which group of the periodic table? A Group 1 B Group 2 C Group 17 D Group 18
10 Ionisation energy is the energy required to: A Add an electron to an atom B Remove an electron from an atom C Share an electron D Break a chemical bond
11 Which of the following is a limitation of the Arrhenius concept? A It explains the behaviour of acids and bases in water only. B It explains proton transfer in all solvents. C It explains electron pair donation. D It explains the amphoteric nature of water.
12 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
13 Which reaction produces a salt and water? A Acid + metal B Acid + carbonate C Acid + base D Acid + acid
14 Which of the following is a property of acids? A They taste bitter B They feel soapy C They turn blue litmus red D They release OH⁻ ions in water
15 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
16 Which property is typical of acids? A They taste sour B They taste bitter C They feel slippery D They turn red litmus blue
17 Going down a group, metallic character generally: A increases B decreases C remains constant D becomes zero
18 What is the trend of atomic size across a period from left to right? A Atomic size increases B Atomic size decreases C Atomic size remains the same D Atomic size first increases then decreases
19 Which element is placed in the f-block of the periodic table? A Iron B Uranium C Calcium D Chlorine
20 Who arranged the elements in order of increasing atomic number and gave the modern periodic law? A Mendeleev B Moseley C Newlands D Dobereiner
21 Which indicator turns red in acidic solution? A Blue litmus B Red litmus C Phenolphthalein D Methyl orange
22 According to the Lewis concept, a base is a substance that: A Donates a proton B Accepts a proton C Donates an electron pair D Accepts an electron pair
23 Moseley improved the periodic table by arranging elements according to: A Atomic mass B Atomic number C Valence electrons D Density
24 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
25 Acids react with carbonates to produce: A Only salt B Salt and water C Salt, water and carbon dioxide D Salt and hydrogen gas