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An alloy of iron and carbon was treated ...

An alloy of iron and carbon was treated with suphuric acid, in which only iron reacts
`2Fe(s) + 3H_(2)SO_(4)(aq) rarr Fe_(2)(SO_(4))_(3)(aq) + 3H_(2)(g)` If a sample of alloy weighing 140 g gave 6 g hydrogen, What is the percentage of iron in the alloy?

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The correct Answer is:
80
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Knowledge Check

  • How many moles of ferric alum (NH_(4))_(2) SO_(4) Fe_(2) (SO_(4))_(3). 24 H_(2)O can be made from the sample of Fe containing 0.0056 g of it?

    A
    `10^(-4) mol`
    B
    `0.5 xx 10^(-4) mol`
    C
    `0.33 xx 10^(-4) mol`
    D
    `2 xx 10^(-4) mol`

  • In the reaction: 2Al_((s))+6HCl_((aq.))rarr2Al_((aq.))^(3+)+6Cl_((aq.))^(-)+3H_(2(g))

    A
    `6 "litre" HCl_((aq.))` is consumed for every `3 LH_(2(g))` produced
    B
    `33.6 "litre" H_(2(g))` is produced regardless of temperature and pressure for every mole `Al` that react
    C
    `67.2 "litre" H_(2(g))` at `STP` is produced for every mole `Al` that reacts
    D
    `11.2 "litre" H_(2(g))` at `STP` is produced for every mole `HCl_((aq.))` consumed

  • Consider the reaction: H_(2)SO_(3)(aq)+Sn^(4+)(aq)+H_(2)O(l)toSn^(2+)(aq)+HSO_(4)^(-)(aq)+3H^(+)(aq) Which of the following statements is correct?

    A
    `Sn4^(+)` is the oxidizing agent because it undergoes oxidation.
    B
    `Sn4^(+)` is the reducing agent because it undergoes oxidation.
    C
    `H2SO_(3)` is the reducing agent because it undergoes oxidation.
    D
    `H2SO_(3)` is the reducing agent because it undergoes reduction.
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