Is this a valid way of training a model ? training loss in 1.1921e-07? While training a keras model, i got this logs. 

Epoch 49/50
2/2 [==============================] - 2s 943ms/step - loss: 1.1921e-07 - acc: 1.0000


As per my knowledge, i know that the ideal loss should be btw 1 to 10 (not sure) while training a model, but i faced this loss value while training in e-07.

Is this a valid training? Or I'm doing wrong somewhere ??
Loss is just a sum of errors that your model makes, so lower values are desirable. In your case, the training accuracy is 1.00, meaning that your model is making perfect predictions during training. No mistakes - no loss, so this is to be expected.

However, having 100% accuracy in training is usually an indication that the model has become too familiar with the training data, effectively memorizing it instead of learning to generalize. Such a model will most likely fail to make adequate predictions on data it hasn't seen before. Unless your validation accuracy is also around 100%, then you're severely overfitting. Great explanations that will get you started on interpreting loss and accuracy can be found here.