$CaCO_3$ (aqueous suspension) $\xrightarrow{AcOH}$ $\xrightarrow{Na_2C_2O_4 \text{ solution}}$
Which of the following observations is correct for the above experiment?

  • A
    $CO_2$ is evolved
  • B
    Finally a clear solution is obtained which is colourless
  • C
    Colour of the initial substance and final precipitate (if any) is the same
  • D
    $1$ and $3$ both are correct

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Given below are two statements:
Statement $I$: Sodium dichromate and potassium dichromate are classified as primary standards in titrimetric analysis.
Statement $II$: Phenolphthalein is a weak base, therefore it dissociates in acidic medium.

The number of white coloured salts among the following is .................
$A$. $SrSO_4$ $B$. $Mg(NH_4)PO_4$ $C$. $BaCrO_4$ $D$. $Mn(OH)_2$ $E$. $PbSO_4$ $F$. $PbCrO_4$ $G$. $AgBr$ $H$. $PbI_2$ $I$. $CaC_2O_4$ $J$. $[Fe(OH)_2(CH_3COO)]$

Which of the following statements is incorrect?

Assign $A$,$B$,$C$,$D$ from the given type of reaction.
$BaCrO_4 \downarrow + CH_3COOH \text{ (Excess)} \longrightarrow \text{No reaction}$

Which of the following chemicals may be used to identify three unlabelled beakers containing conc. $NaOH$, conc. $H_{2}SO_{4}$ and water?

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