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The p-Block Ele...

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  • Question 1
    1 / -0

    Which of the following elements occur free in nature?

  • Question 2
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    Which of the following displaces $$Br_{2}$$ from an aquenous solution containing bromide ions?

  • Question 3
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    Which of the following has $$p\pi -d\pi$$ bonding? 

  • Question 4
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    In Haber's process of manufacturing of ammonia:
    $${ N }_{ 2 }\left( g \right) +{ 3H }_{ 2 }\left( g \right) \longrightarrow 2{ NH }_{ 3 }\left( g \right) ;{ H }_{ { 25 }^{ 0 }C }^{ o }=-92.2kJ$$
    Molecule: $${ C }_{ p }{ JK }^{ -1 }{ mol }^{ -1 }$$
    $${ N }_{ 2 }\left( g \right) $$: 29.1
    $${ H }_{ 2 }\left( g \right) $$: 28.8
    $${ NH }_{ 3 }\left( g \right) $$: 35.1 
    If $${ C }_{ p }$$ is independent of temperature, then reaction at $${ 100 }^{ 0 }C$$ as compared to that of $$25^{ 0 }C$$ will be:

  • Question 5
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    $$p\pi -d\pi \quad$$ bonding is present in:

  • Question 6
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    $$NH_3$$ is formed in the following steps
    I. $$Ca+2C\rightarrow CaC_2$$    50% yield
    II. $$CaC_2+N_2\rightarrow CaCN_2+C$$   100% yield
    III. $$CaCN_2+3H_2O\rightarrow 2NH_3+CaCO_3$$        50% yield
    To obtain 2 moles $$NH_3$$, calcium required is:

  • Question 7
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    As per Braun's principle, yield of Ammonia will be more in Haber's process under ______, conditions ($$L=$$ Low; $$H=$$ high; $$T=$$ Temp; $$P=$$ Pressure)

  • Question 8
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    When two atoms of chlorine combine to form one molecule of chlorine gas, the energy of the molecule:

  • Question 9
    1 / -0

    The role of zinc stearate in the process of vulcanisation is:

  • Question 10
    1 / -0

    Which of the following characteristics regarding 7 halogens is not correct? 

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