Question

Match the following:

List I (alkaline earth metal)	List II (density / g cm3)
A. Be	I. 1.74
B. Mg	II. 1.84
C. Ca	III. 2.63
D. Sr	IV. 1.55

The correct answer is

• A. A-III, B-II, C-I, D-IV
• B. A - I, B - II, C - III, D - IV
• C. A - IV, B - III, C - II, D - I
• D. A - II, B - I, C - III, D - IV

Hint:

Density values for common elements can usually be found in reference tables, and they are essential for matching substances in problems like this.

Answer 1

The Correct Option is A

We are given a set of alkaline earth metals and their corresponding densities. To match the metals with their densities, we need to refer to their known values: - \( \text{Be} \) has a density of \( 1.74 \, \text{g/cm}^3 \), - \( \text{Mg} \) has a density of \( 1.84 \, \text{g/cm}^3 \), - \( \text{Ca} \) has a density of \( 2.63 \, \text{g/cm}^3 \), - \( \text{Sr} \) has a density of \( 1.55 \, \text{g/cm}^3 \). Thus, the correct matching is: A - III, B - II, C - I, D - IV.

Answer 2

Step 1: Understanding the Elements and Their Densities
The alkaline earth metals given are Beryllium (Be), Magnesium (Mg), Calcium (Ca), and Strontium (Sr). Each metal has a characteristic density value, which generally increases down the group but with some exceptions.

Step 2: Analyzing the Density Values
- Beryllium (Be) is the lightest among these and has a relatively high density of about 2.63 g/cm³.
- Magnesium (Mg) has a density close to 1.84 g/cm³.
- Calcium (Ca) has a density of around 1.74 g/cm³.
- Strontium (Sr) is heavier than calcium and magnesium but less dense than beryllium, approximately 1.55 g/cm³.

Step 3: Matching Each Metal with Its Density
- A. Be → III. 2.63 g/cm³
- B. Mg → II. 1.84 g/cm³
- C. Ca → I. 1.74 g/cm³
- D. Sr → IV. 1.55 g/cm³

Step 4: Conclusion
Thus, the correct matching of alkaline earth metals with their densities is A-III, B-II, C-I, D-IV.