Inorganic Chemistry - Block Elements

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Q1. Which of the following is the lightest alkaline earth metal? (2019)

Solution:

Beryllium (Be) is the lightest alkaline earth metal.

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Q2. Which alkaline earth metal is used in fireworks for its bright flame? (2021)

Solution:

Strontium (Sr) is used in fireworks to produce a bright red flame.

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Q3. Which of the following compounds is formed when magnesium reacts with oxygen? (2019)

Solution:

Magnesium reacts with oxygen to form magnesium oxide (MgO).

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Q4. Which of the following is not an alkaline earth metal? (2020)

Solution:

Aluminum (Al) is not an alkaline earth metal; it is a post-transition metal.

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Q5. Which of the following statements is true about alkali metals? (2023)

Solution:

Alkali metals are good conductors of electricity due to the presence of free-moving electrons.

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Q6. Which alkali metal is known for its vigorous reaction with water? (2022)

Solution:

Potassium (K) reacts vigorously with water, producing potassium hydroxide and hydrogen gas.

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Q7. What is the trend in atomic radius as you move down the alkali metal group? (2022)

Solution:

The atomic radius increases as you move down the alkali metal group due to the addition of electron shells.

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Q8. Which of the following elements is a member of the alkali metals? (2020)

Solution:

Sodium (Na) is an alkali metal, while Magnesium (Mg), Calcium (Ca), and Barium (Ba) are alkaline earth metals.

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Q9. Which of the following alkaline earth metals reacts vigorously with water? (2019)

Solution:

Calcium reacts vigorously with water to form calcium hydroxide and hydrogen gas.

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Q10. Which of the following elements is not an alkali metal? (2023)

Solution:

Aluminum (Al) is not an alkali metal; it is a post-transition metal.