Which of the following reagents are used as primary standard?
$I : K M n O_{4}; I I : N a O H; I I I : K_{2} C r_{2} O_{7}; I V : F e S O_{4} (N H_{4})_{2} S O_{4} .6 H_{2} O; V : H_{2} C_{2} O_{4} .2 H_{2} O$

All except

I I, I V

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All except

I, I I

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All except

I, I I, I I I

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Only

I V

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Solution

The correct option is B All except $I, I I$
Primary Standard: A primary standard is a reagent which is very pure, representative of the number of moles the substance contains and easily weighed.
Primary standards are typically used in titrations and other analysis techniques as standardization solutions.

Examples of primary standards used in redox titrations include pure iron, $N a C_{2} O_{4}$ (sodium oxalate), $A s_{2} O_{3}$ (arsenic trioxide), $K_{2} C r_{2} O_{7}$ (potassium dichromate), $K B r O_{3}$ (potassium bromate), $K I O_{3}$ (potassium iodate) and $K H (I O_{3})_{2}$ (potassium hydrogen iodate).

So, option (B) is correct.

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Which of the following reagents are used as primary standard?I:KMnO4;II:NaOH;III:K2Cr2O7;IV:FeSO4(NH4)2SO4.6H2O;V:H2C2O4.2H2O

Which of the following reagents are used as primary standard?
$I : K M n O_{4}; I I : N a O H; I I I : K_{2} C r_{2} O_{7}; I V : F e S O_{4} (N H_{4})_{2} S O_{4} .6 H_{2} O; V : H_{2} C_{2} O_{4} .2 H_{2} O$