Statement I is false because sodium dichromate is deliquescent (absorbs moisture from the atmosphere) and cannot be weighed accurately, so it is not used as a primary standard. Potassium dichromate, however, is a primary standard.
Statement II is false because phenolphthalein is a weak organic acid, not a weak base. It remains largely undissociated in an acidic medium (colorless) and dissociates in a basic medium to give a pink color.
Therefore, both Statement I and Statement II are false.
Answer: Both Statement I and Statement II are false