For the given reactions, which of the following statements are true? underset("(excess)")(KI +K_3 ) [Fe (CN)_6]underset(H_2 SO_4 ) overset("dilute ") tounderset("darrZn SO_4)(" Brownishyellowsolution ") whiteprecipitate+{:(ubrace("Brownish yellow filtrate")),(""darr Na_2 S_2 O_4),("colourlesssolution"):}

For the given reactions, which of the following statements are true?

1.	For the given reactions, which of the following statements are true? underset("(excess)")(KI +K_3 ) [Fe (CN)_6]underset(H_2 SO_4 ) overset("dilute ") tounderset("darrZn SO_4)(" Brownishyellowsolution ") whiteprecipitate+{:(ubrace("Brownish yellow filtrate")),(""darr Na_2 S_2 O_4),("colourlesssolution"):}
Answer» The first reaction is a redox reaction. White precipitate is of `Zn_3 [Fe(CN)_6]_2` Addition of starch solution to FILTRATE gives blue colour. White precipitate is soluble in NAOH solution. Solution :`2KI^(-1)+2K_3 overset(III)([Fe(CN)_6]overset(dilH_2SO_4) to2 K_4 [Fe(CN)_6 ]+overset(0)I_2` ` I_2+ KIto KI_3` ` K_4 [Fe (CN) _6] + 2 ZnSO_4toZn_2 [Fe (CN) _6 ] +2K_2 SO_4 ` `UNDERSET("Brownishyellow filtrate ") ( KI_3+ 2Na_2 S_2O_3tounderset("COLOURLESSSOLUTION ") (Na_2S_4O_6+ 2KI+KI` `Zn_2[Fe(CN)_6 ]+8NaOHto2Na_2underset("Soluble ")([Zn (OH)_4] )+Na_4 [Fe (CN)+6 ]`