JEE Main 2015 · 11 Apr · Shift 1, Chemistry question 47

$\ce{Na2Cr2O7}$ is in fact far more soluble (and hygroscopic) than $\ce{K2Cr2O7}$, so statement (4) is false. This is the keyed answer.

Statement (3) is also doubtful: it is $\ce{K2Cr2O7}$, not the hygroscopic sodium salt, that serves as a primary standard. (1) and (2) are true.