Sieve the gram flour into a bowl and add the salt, bicarbonate of soda, ground rice, cumin, coriander, chili powder and green chilies. Mix well. Gradually add the water and keep mixing until a thick batter is formed. Chill for 30 minutes.
Coat the chicken pieces with the batter.
Heat the oil in a wok/deep fry to 180 degC. Use a tablespoon or tongs to put in as many batter coated potatoes as will fit without overlap. Fry until golden brown (6 to 8 minutes). Remove with a slotted spoon and drain on absorbent paper.
Fry the remaining chicken pieces in the same manner.