1.

    Which does not react with cold water?

    A

    Mg3N2{\rm{M}}{{\rm{g}}_3}{{\rm{N}}_2}

    B

    CaC2{\rm{Ca}}{{\rm{C}}_2}

    C

    COCl2{\rm{COC}}{{\rm{l}}_2}

    D

    SiC{\rm{SiC}}

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    3.

    Which does not react with cold water?

    A

    Mg3N2{\rm{M}}{{\rm{g}}_3}{{\rm{N}}_2}

    B

    CaC2{\rm{Ca}}{{\rm{C}}_2}

    C

    COCl2{\rm{COC}}{{\rm{l}}_2}

    D

    SiC{\rm{SiC}}

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    5.

    Density of water is maximum at :

    A

    0∘C0{\rm{ }}^\circ {\rm{C}}

    B

    100∘C100^\circ {\rm{C}}

    C

    4∘C4^\circ {\rm{C}}

    D

    0β€…β€ŠK0\;K

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    6.

    The bond energy of covalent Oβ€”H bond in water is:

    A

    Equal to bond energy of hydrogen bond

    B

    Greater than bond energy of hydrogen bond

    C

    Lesser than bond energy of hydrogen bond

    D

    None of the above

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    7.

    Water contracts on heating:

    A

    Toβ€…β€Š100∘CTo{\rm{ }}\;100^\circ C

    B

    From\;{\rm{ }}0\;^\circ C\;to\;{\rm{ }}4^\circ C

    C

    To 273β€…β€ŠKTo\,{\rm{ }}273\;{\rm{ }}K

    D

    Fromβ€…β€Š10∘Cβ€…β€Šβ€…β€Štoβ€…β€Š20∘CFrom\;{\rm{ }}10^\circ C\;\;to\;{\rm{ }}20^\circ C

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    8.

    The anomalous expansion of water below 4Β°C is attributed to:

    A

    Increased kinetic energy of molecules

    B

    Formation of a more open hydrogen-bonded structure

    C

    Decreased density of water molecules

    D

    Increased van der Waals forces

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