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An amorphous soild A burns in air to fo...

An amorphous soild A burns in air to form a gas B which turns lime water milky. The gas is also produced as a by - product during roasting of sulohide ore. This gas decolourises acidified aqueous `KMnO_(4)` solution and reduces `Fe^(3+)` to `Fe^(2+)` . Identify the solid A and the gas B and write the reactions involved.

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The available information suggests that the amorphous solid "A" is sulphur. It exists as `S_(8)` molecule and burns in air to form sulphur dioxide `(SO_(2))` gas "B". The gas turns lime water milky due to the formation of a compound calcium sulphite `(CaSO_(3))`
`underset("A")(S_(8))+underset(("Air"))(8O_(2)(g))overset("heat")to underset("B")(8SO_(2)(g))`
`underset("Lime water")(Ca(OH)_(2)(aq))+SO_(2)(g) ot underset(("Milky"))(CaSO_(3)(s))+H_(2)O(aq)` The gas is produced as a by-product during the roasting of sulphide ore such as zinc blende (ZnS)
`2ZnS(s) +3 O_(2)(g) overset("heat") to 2ZnO(s) + 2SO_(2)(g)`
The gas decolourises acidified aqueous `KMnO_(4)` solution and reduces compounds like `Fe_(2)(SO_(4))_(3)` containing `Fe^(3+)` ions to `FeSO_(4)` containing `Fe^(2+)` ions
`2KMnO_(4)underset(("Pink"))(aq)+5SO_(2)(g)+2H_(2)O(aq) to underset("Colourless") K_(2)SO_(4)(aq) +2MnSO_(4) underset("Colourless") (aq)+2H_(2)SO_(4)(aq)`
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An amorphous solid 'A' burns in air to form a gas 'B' which turns lime water milky. The gas is also produced as a by-product during roasting of sulphide ore. This gas decolourises acidified aqueous KMnO_(4) solution and reduces Fe^(3+)" to "Fe^(2+) . Identify the solid ''A'' and the gas ''B'' and write the reactions involved.

An amorphous solid 'A' burns in air to form a gas 'B' which turns lime water milky. The gas is also produced as a by-product during roasting of sulphide ore. This gas decolourises acidified aqueous KMnO_(4) solution and reduces Fe^(3+) to Fe^(2+) . Identify the solid "A" and the gas "B" and write the reaction involved.

Knowledge Check

  • A solution reacts with marble chips to produce a gas which turns lime water milky. The solution contains:

    A
    `Na_(2)SO_(4)`
    B
    `CaSO_(4)`
    C
    `H_(2)SO_(4)`
    D
    `K_(2)SO_(4)`

  • An amorphous solid (X) burns in air to form a gas ( Y) which turns lime water milky. This gas decolourises aqueous solution of acidified KMnO_(4). Gas (Y) reacts with oxygen to give another gas (Z) which is responsible for acid rain. X, Y and Z are

    A
    `{:("X","Y","Z"),(C, CO,CO_(2)):}`
    B
    `{:("X","Y","Z"),(S, SO_(2),SO_(3)):}`
    C
    `{:("X","Y","Z"),(P, P_(2)O_(3),P_(2)O_(5)):}`
    D
    `{:("X","Y","Z"),(S, SO_(3),H_(2)SO_(4)):}`

  • An amorphous solid (X) burns in air to form a gas (Y) which turns lime water milky. This gas decolourises aqueous solution of acidified KMnO_4 . Gas (Y) reacts with oxygen to give another gas (Z) which is responsible for acid rain. X, Y and Z are

    A
    X-C, Y-CO, Z-`CO_2`
    B
    X-S, Y-`SO_2` , Z-`SO_3`
    C
    X-P , Y-`P_2O_3` ,Z - `P_2O_5`
    D
    X-S , Y-`SO_3` ,Z-`H_2SO_4`

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