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The p-Block Ele...

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  • Question 1
    1 / -0

    Which among the following substances is not a component of the mixture used for glazing pottery?

  • Question 2
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    Which of the following does not react with cold water?

  • Question 3
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    $$Me_3SiCl$$ is mixed with $$Me_2SiCl_2$$ to get a polymers called silicones of the type:


  • Question 4
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    Silica reacts with $$Mg$$ to form a magnesium compound $$A$$. $$A$$ reacts with dilute $$HCl$$ and forms $$B$$. The compound $$B$$ is:

  • Question 5
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    Borax in its crystal possess:

  • Question 6
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    Microcosmic salt and borax are used in the identification of cations by dry tests. They are respectively :

  • Question 7
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    Read the following write-ups and answer the questions at the end of it. 
    Silicons are synthetic polymers containing repeated $$R_{2}SiO$$ units. Since, the empirical formula is that of a ketone $$(R_{2}CO)$$, the name silicone has been given to these materials. Silicones can be made into oils, rubbery elastomers and resins. They find a variety of applications because of their chemical inertness, water repelling nature, heat- resistance and good electrical insulating property. Commercial silicon polymers are usually methyl derivatives and to a lesser extent phenyl derivatives and  are synthesised by the hydrolysis of $$R_{2}SiCl_{2}$$[R=methyl (Me) or phenyl (Ph)]

    If we mix $$Me_{3}SiCl$$ with $$Me_{2}SiCl_{2}$$, we get silicones of the type:

  • Question 8
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    One natural source of atmospheric $$CO_2$$ is precipitation reaction such as the precipitation of silicates in the oceans:


    $$Mg^{2+}(aq)+SiO_2(dispersed)+2HCO_3(aq)\rightarrow MgSiO_3(s)+2CO_2(g)+H_2O(l)$$

    How many grams of magnesium silicate would be precipitated during the formation of $$100$$ L of $$CO_2$$ at $$30^oC$$ and $$775$$ torr? 
    $$(Mg=24, Si=28, C=12, O=16)$$

  • Question 9
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    $$Al + N_2 \xrightarrow {\triangle} (A) \xrightarrow {H_2O} (B) \xrightarrow {K_2HgI_4/OH^-} (D)$$ (brown ppt.)


    What is $$(D)$$?

  • Question 10
    1 / -0

    Which is incorrect statement about silicons?

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