A) \[FeS{{O}_{4}}\]
B) \[FeS{{O}_{4}}{{(N{{H}_{4}})}_{2}}S{{O}_{4}}6{{H}_{2}}O\]
C) \[NaOH\]
D) \[HCl\]
Correct Answer: B
Solution :
Mohrs salt,\[FeS{{O}_{4}}{{(N{{H}_{4}})}_{2}}S{{O}_{4}}.6{{H}_{2}}O\]is a primary standard (i.e., pure and stable). On the other hand\[FeS{{O}_{4}}\]is always contaminated with\[F{{e}_{2}}{{(S{{O}_{4}})}_{3}}.NaOH\]is hygroscopic and always contains some moisture.\[HCl\]may lose some of\[HCl\]vapours on keeping. Thus they are not stable and pure and are not a primary standard.
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