Inorganic Chemistry - Block Elements
Q. What is the common oxidation state of alkaline earth metals? (2019)
Solution
Alkaline earth metals typically exhibit a common oxidation state of +2.
Correct Answer: B — +2
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Q. What is the primary characteristic of alkaline earth metals? (2020)
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A.
They are highly reactive
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B.
They have a +2 oxidation state
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C.
They are gases at room temperature
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D.
They form covalent bonds
Solution
Alkaline earth metals typically have a +2 oxidation state due to the loss of two electrons.
Correct Answer: B — They have a +2 oxidation state
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Q. What is the primary product of the thermal decomposition of calcium carbonate? (2019)
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A.
Calcium oxide
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B.
Calcium hydroxide
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C.
Calcium bicarbonate
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D.
Calcium chloride
Solution
The thermal decomposition of calcium carbonate (CaCO3) produces calcium oxide (CaO) and carbon dioxide (CO2).
Correct Answer: A — Calcium oxide
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Q. What is the trend in atomic radius as you move down the alkali metal group? (2022)
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A.
Increases
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B.
Decreases
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C.
Remains constant
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D.
Increases then decreases
Solution
The atomic radius increases as you move down the alkali metal group due to the addition of electron shells.
Correct Answer: A — Increases
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Q. Which of the following alkali metals is most reactive with water? (2023)
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A.
Lithium
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B.
Sodium
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C.
Potassium
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D.
Rubidium
Solution
Potassium (K) is more reactive with water than Sodium (Na) and Lithium (Li).
Correct Answer: C — Potassium
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Q. Which of the following compounds is used as a drying agent? (2023)
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A.
Calcium chloride
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B.
Sodium chloride
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C.
Potassium bromide
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D.
Magnesium sulfate
Solution
Calcium chloride (CaCl2) is commonly used as a drying agent due to its hygroscopic nature.
Correct Answer: A — Calcium chloride
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Q. Which of the following elements has the highest ionization energy in the alkali metal group? (2023)
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A.
Lithium
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B.
Sodium
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C.
Potassium
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D.
Rubidium
Solution
Lithium (Li) has the highest ionization energy among the alkali metals due to its smaller atomic size.
Correct Answer: A — Lithium
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Q. Which of the following elements is a member of the alkali metals? (2020)
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A.
Magnesium
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B.
Sodium
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C.
Calcium
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D.
Barium
Solution
Sodium (Na) is an alkali metal, while Magnesium (Mg), Calcium (Ca), and Barium (Ba) are alkaline earth metals.
Correct Answer: B — Sodium
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Q. Which of the following is the lightest alkaline earth metal? (2019)
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A.
Barium
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B.
Calcium
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C.
Magnesium
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D.
Beryllium
Solution
Beryllium (Be) is the lightest alkaline earth metal.
Correct Answer: D — Beryllium
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Q. Which of the following is the most electropositive element? (2021)
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A.
Lithium
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B.
Sodium
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C.
Potassium
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D.
Rubidium
Solution
Rubidium (Rb) is the most electropositive element among the given options.
Correct Answer: D — Rubidium
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