Compounds that should not be used as primary standards in titrimetric analysis are(redox)
(A) $Na_{2} Cr_{2} O_{7}$ (B) Oxalic acid(C) NaOH(D) $FeSO_{4} \cdot 6 H_{2} O$ (E) Sodium tetraborate
Choose the most appropriate answer from the options given below:

Question

Compounds that should not be used as primary standards in titrimetric analysis are(redox)
(A)

Na_{2} Cr_{2} O_{7}

(B) Oxalic acid(C) NaOH(D)

FeSO_{4} \cdot 6 H_{2} O

(E) Sodium tetraborate
Choose the most appropriate answer from the options given below:

Accepted Answer

Correct answer: D. (d) The primary standard is a highly pure stable compound with a known exact composition that can be accurately weighed and dissolved to creat a solution of known concentration. NaOH is hygroscopic and can't be used. FeSO_4 6H_2O is unstable and can be easily oxidised. Na_2 Cr_2O_7 is hygroscopic and can't be used.

$Compounds that should not be used as primary standards in titrimetric analysis are(redox) (A) Na_{2} Cr_{2} O_{7} (B) Oxalic acid(C) NaOH(D) FeSO_{4} \cdot 6 H_{2} O (E) Sodium tetraborate Choose the most appropriate answer from the options given below:$

Solution

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