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Find total number of reagnets which cann...

Find total number of reagnets which cann produce `I_(2)` from KI solution.
Conc. `H_(2)SO_(4)," "Hg(NO_(3))_(2)"solution, "CuSO_(4)" solution, Conc."H_(3)PO_(4)`,
`K_(2)Cr_(2)O_(7)//H^(+)," "Cl_2" Water, "Pb(CH_(3)COO)_(2)" solution, "Ca(OCl)Cl//H^(+)," "NaNO_(2)+dil.HCl`

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The correct Answer is:
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Total number of reagents give below reacted with KI_((aq)) to produce I_(2): CuSO_(4)" "Hg(NO_(3))_(2) "Concentrate"H_(2)SO_(4)"Concentrate"H_(3)PO_(4) KMnO_(4)//H^(+)" "K_(2)Cr_(2)O_(7)//H^(+) Cl_(2) water acidify bleaching powder Pb(NO_(3))_(2)NaNo_(2)+HCl("dil.")

Why do we not prefer to prepare original solution in conc. H_(2)SO_(4) or conc. HNO_(3) ?

Knowledge Check

  • Conc. H_2SO_4 is similar to conc. H_3PO_4 , in that

    A
    both will oxidize `I^(-)" to "I_(2)`
    B
    if neutralized by alkali, both will forms a precipitate with `BaCl_2` solution, which is soluble in dil. HCI
    C
    both can be used to dry `NH_3` gas
    D
    both will displace volatile acids from their salts

  • The reddish brown gas produced by heating KCl with K_(2)Cr_(2)O_(7) (solid) and conc. H_(2)SO_(4) is

    A
    `Cl_(2)`
    B
    `CrO_(2)Cl_(2)`
    C
    `CrO_(3)`
    D
    `H_(2)CrO_(4)`

  • When H_(2)S is passed through acidified K_(2)Cr_(2)O_(7) solution, the solution turns :

    A
    yellow
    B
    blue
    C
    green
    D
    white

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