The methods NOT involved in concentration of ore are
A.Liquid
B.Leaching
C.Electrolysis
D.Hydroallic washing
E.Froth floatation
Choose the correct answer from the options given below:

Options

A. `B,D` and `E` only ``
B. `C,D` and `E` only ``
C. `A` and `C` only ``
D. `B,D` and `C` only

Answer

To solve the question regarding the methods NOT involved in the concentration of ore, we will analyze each option provided:

1. **Liquid**: This option seems to refer to "liquefaction," which is not a method of concentrating ore. Instead, it is a process related to refining or separating materials based on their liquid state. Therefore, this method is NOT involved in the concentration of ore.

2. **Leaching**: This is a method used in the concentration of ores, particularly for metals like gold and silver. In leaching, a solvent is used to dissolve the desired minerals from the ore. Thus, leaching is involved in the concentration of ore.

3. **Electrolysis**: This method is primarily used for the extraction of metals, especially those with high reactivity, such as sodium and aluminum. Electrolysis is not a method for concentrating ore but rather for refining and extracting metals from their ores. Therefore, this method is NOT involved in the concentration of ore.

4. **Hydraulic washing**: This method involves using a stream of water to separate impurities based on density differences. It is a common technique for concentrating ores, particularly in the case of heavy minerals. Thus, hydraulic washing is involved in the concentration of ore.

5. **Froth flotation**: This is a widely used method for concentrating sulfide ores. It works on the principle of differences in surface properties of the minerals. Froth flotation is indeed a method of concentrating ore.

Based on the analysis, the methods NOT involved in the concentration of ore are:

**Answer: A (Liquid) and C (Electrolysis)**