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Transition metals combine with halogens ...

Transition metals combine with halogens at high temperature to form compounds called halides. On account of high activation energy , the reactions require high temperature to start, but once the the reaction is started , the heat of reaction is sufficient to maintain the continuity .
Metals in higher oxidation state form flourides as it is the most electronegative element . Flourides are ionic in nature . The chlorides , bromides and iodides have ionic as well as covalent character . Halides of metals is higher oxidation states are relatively unstable and hydrolysed very easily .
`DeltaH_(f)` is negative for

A

Flourides

B

Bromides

C

Iodides

D

All of these

Text Solution

Verified by Experts

The correct Answer is:
D
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Transition metals combine with halogens at high temperature to form compounds called halides. On account of high activation energy , the reactions require high temperature to start, but once the the reaction is started , the heat of reaction is sufficient to maintain the continuity . Metals in higher oxidation state form flourides as it is the most electronegative element . Flourides are ionic in nature . The chlorides , bromides and iodides have ionic as well as covalent character . Halides of metals is higher oxidation states are relatively unstable and hydrolysed very easily . Aqueous solution of which compound will have pH lt 7 ?

Which of the following reactions requires high temperature and catalyst ?

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Knowledge Check

  • Transition metals combine with halogens at high temperature to form compounds called halides. On account of high activation energy , the reactions require high temperature to start, but once the the reaction is started , the heat of reaction is sufficient to maintain the continuity . Metals in higher oxidation state form flourides as it is the most electronegative element . Flourides are ionic in nature . The chlorides , bromides and iodides have ionic as well as covalent character . Halides of metals is higher oxidation states are relatively unstable and hydrolysed very easily . Aqueous solution of which compound will have pH lt 7 ?

    A
    `TiCl_(4)`
    B
    `FeCl_(3)`
    C
    `CuSO_(4)`
    D
    All of these

  • Which of the following reactions requires high temperature and catalyst ?

    A
    `H_(2)+F_(2)rarr2HF`
    B
    `H_(2)+Cl_(2)rarr2HCl`
    C
    `H_(2)+Br_(2)rarr2HBr`
    D
    `H_(2)+I_(2)rarr2HI`

  • Transition metals react with halogen at elevated temperature to form halides. The reactivity order of halogens are

    A
    `F_2 gt Cl_2 gt Br_2 gt I_2`
    B
    `Cl_2 gt F_2 gt Br_2 gt I_2`
    C
    `I_2 gt Br_2 gt Cl_2 gt F_2`
    D
    `Cl_2 lt F_2 gt I_2 gt Br_2`