Compounds that should not be used as primary | vedclass

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(D) primary standard is a highly pure,stable compound with a known exact composition that can be accurately weighed and dissolved to create a solution

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$A, C$ and $D$ Only

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(D) primary standard is a highly pure,stable compound with a known exact composition that can be accurately weighed and dissolved to create a solution of known concentration. $1.$ $Na_2Cr_2O_7$ is hygroscopic,meaning it absorbs moisture from the air,making it unsuitable as a primary standard. $2.$ $NaOH$ is highly hygroscopic and reacts with atmospheric $CO_2$,so it cannot be used as a primary standard. $3.$ $FeSO_4 \cdot 6H_2O$ is unstable and easily oxidized by atmospheric oxygen,making it unsuitable. Oxalic acid and Sodium tetraborate are stable and commonly used as primary standards. Therefore,$Na_2Cr_2O_7$ $(A)$,$NaOH$ $(C)$,and $FeSO_4 \cdot 6H_2O$ $(D)$ should not be used as primary standards.

Compounds that should not be used as primary standards in titrimetric analysis are $:$
$A.$ $Na_2Cr_2O_7$
$B.$ Oxalic acid
$C.$ $NaOH$
$D.$ $FeSO_4 \cdot 6H_2O$
$E.$ Sodium tetraborate
Choose the most appropriate answer from the options given below $:$

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Compounds that should not be used as primary standards in titrimetric analysis are $:$$A.$ $Na_2Cr_2O_7$$B.$ Oxalic acid$C.$ $NaOH$$D.$ $FeSO_4 \cdot 6H_2O$$E.$ Sodium tetraborateChoose the most appropriate answer from the options given below $:$