Leaves losing chlorophyll

Due to unknown reasons all moong and other plants in a particular pot are losing all the chlorphyll over a period of time and then drying up. The seeds from the same seed batch which were planted elsewhere are not facing a similar problem . The loss of chlorophyll is a gradual process taking a few weeks .
There appears to be a problem with the soil or a pest which is causing the loss of chlorophyll over a period of time.
The dark green leaves become almost white after a few weeks
Any information on the cause of loss of chlorophyll will be appreciated, along with home remedies