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Cu2O, Cu2S, Al2O3 , CuFeS2...

`Cu_2O, Cu_2S, Al_2O_3 , CuFeS_2 `

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`Al_2O_3`
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Knowledge Check

  • The enthalpies of formation of Al_2O_3 and Cr_2O_3 are -1596 kJ and -1134 KJ, respectively . DeltaH for reaction 2Al+Cr_2O_3 to 2Cr +Al_2O_3 is _____

    A
    `-1365` kJ
    B
    2730 kJ
    C
    `-2730` kJ
    D
    `-462` kJ

  • The correct increasing order of the oxidation state of sulphur in the anions SO_4^(2-) , SO_3^(2-) , S_2O_4^(2-) , S_2 O_6^(2-) is ………………………. .

    A
    `SO_3^(2-) lt SO_4^(2-) lt S_2 O_4^(2-) lt S_2 O_6^(2-)`
    B
    `SO_4^(2-) lt S_2 O_4^(2-) lt S_2 O_6^(2-) lt SO_3^(2-)`
    C
    `S_2 O_4^(2-) lt SO_3^(2-) lt S_2 O_6^(2-) lt SO_4^(2-)`
    D
    `S_2 O_6^(2-) lt S_2 O_4^(2-) lt SO_4^(2-) lt SO_3^(2-)`

  • The enthalpies of formation of Al_2O_3 and Cr_2O_3 are - 1596 kJ and - 1134 kJ, respectively. Delta H for the reaction: 2Al + Cr_2O_3 to 2Cr + Al_2O_3 is

    A
    -1365 kJ
    B
    2730 kJ
    C
    -2730 kJ
    D
    ` - 462 kJ`

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