Amorphous substances show
(A) short and long range order
(B) short range order
(C ) long range order(D ) have no sharp `M.P`

Options

A. (a) and (c) are correct
B. (b) and (c) are correct
C. (c) and (d) are correct
D. (b) and (d) are correct

Answer

To solve the question regarding the characteristics of amorphous substances, we will analyze each option provided:

**Step 1: Understanding Amorphous Substances**
Amorphous substances are solids that lack a well-defined long-range order in their atomic arrangement. This means that while they may have some short-range order, they do not exhibit a repeating pattern over long distances.

**Step 2: Analyzing the Options**
- **Option A: Short and long range order**
This is incorrect because amorphous substances only exhibit short-range order, not long-range order.

- **Option B: Short range order**
This is correct. Amorphous substances do have short-range order in their structure.

- **Option C: Long range order**
This is incorrect. Amorphous substances do not have long-range order.

- **Option D: Have no sharp melting point**
This is correct. Amorphous substances do not have a sharp melting point; instead, they soften over a range of temperatures.

**Step 3: Conclusion**
Based on the analysis:
- Correct statements about amorphous substances are B (short range order) and D (have no sharp melting point).

Thus, the correct answer is **Option 4: B and D are correct.**

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