Which of the following given statements is/are correct?
(a) cold cream is an example of (W/O) type emulsions,
(b)electrical conductance of aqueous emulsions is less than that of oil emulsions
(c) emulsions cannot be broken into constituent liquids by heating or freezing
(d) an emulsion can be diluted with water, then it forms (O/W) type emulsion

Options

A. (a) and (d)
B. only (a)
C. (a), (b) & (c)
D. (a) ,(c) & (d)

Answer

To determine which of the given statements about emulsions are correct, we will analyze each statement one by one.

### Step-by-Step Solution:

1. **Statement (a)**: "Cold cream is an example of (W/O) type emulsions."
- **Analysis**: Cold cream is indeed an example of a water-in-oil (W/O) emulsion. In this type, water droplets are dispersed in oil. Therefore, this statement is **correct**.

2. **Statement (b)**: "Electrical conductance of aqueous emulsions is less than that of oil emulsions."
- **Analysis**: Aqueous emulsions, which contain water, generally have higher electrical conductivity compared to oil emulsions. This is because water is a better conductor of electricity than oil. Hence, this statement is **incorrect**.

3. **Statement (c)**: "Emulsions cannot be broken into constituent liquids by heating or freezing."
- **Analysis**: Emulsions can indeed be broken down into their constituent liquids by processes such as heating or freezing. Therefore, this statement is **incorrect**.

4. **Statement (d)**: "An emulsion can be diluted with water, then it forms (O/W) type emulsion."
- **Analysis**: When an emulsion (specifically a W/O emulsion) is diluted with water, it can transition to an oil-in-water (O/W) emulsion, as the water becomes the continuous phase. Thus, this statement is **correct**.

### Conclusion:
Based on the analysis, the correct statements are:
- (a) Cold cream is an example of (W/O) type emulsions. **(Correct)**
- (b) Electrical conductance of aqueous emulsions is less than that of oil emulsions. **(Incorrect)**
- (c) Emulsions cannot be broken into constituent liquids by heating or freezing. **(Incorrect)**
- (d) An emulsion can be diluted with water, then it forms (O/W) type emulsion. **(Correct)**

Therefore, the correct answers are **(a) and (d)**.