Block Elements (Group 1 and Group 2) Quiz - CBSE Class 11 Science
Free practice quiz: Block Elements (Group 1 and Group 2) (CBSE Class 11 Science). 20 multiple-choice questions with answers and explanations. Play online, no sign-up needed.
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Which of the following is NOT a characteristic of alkali metals (Group 1)?
- Low electronegativity
- High reactivity
- Form +1 ions
- High melting points
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Answer: D. High melting points
Alkali metals have low melting points due to weak metallic bonding.
Explain the trend in atomic radii across Group 1.
- Increases
- Decreases
- Remains constant
- Irregular trend
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Answer: A. Increases
Atomic radii increase down the group due to the addition of electron shells.
Compare and contrast the reactivity of lithium and sodium.
- Lithium is more reactive
- Sodium is more reactive
- They have equal reactivity
- Their reactivity is unpredictable
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Answer: B. Sodium is more reactive
Sodium has a lower ionization energy than lithium.
Describe the biological importance of magnesium and calcium.
- Magnesium in chlorophyll, calcium in bones and teeth
- Magnesium in bones, calcium in chlorophyll
- Both are crucial for nerve impulse transmission only
- No significant biological roles
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Answer: A. Magnesium in chlorophyll, calcium in bones and teeth
Magnesium is essential for photosynthesis, while calcium is vital for structural integrity and various biological processes.
Explain the effect of increasing atomic number on the reducing power of alkali metals.
- Reducing power decreases
- Reducing power increases
- Reducing power remains constant
- No significant effect
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Answer: B. Reducing power increases
Reducing power increases down the group due to decreasing ionization energy.