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Chemistry Test ...

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  • Question 1
    1 / -0

    Chlorobenzene is prepared commercially by-

  • Question 2
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    Which one of the following cannot be prepared from B2H6 ?

  • Question 3
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    The electron energy in hydrogen atom is given by\(\mathrm{E}_{\mathrm{n}}=-\frac{21 \cdot 7 \times 10^{-12}}{\mathrm{n}^{2}} \mathrm{erg}\). Calculate the energy required to remove an electron completely from the n = 2 orbit. What is the longest wavelength (in cm) of light that can be used to cause this transition?

  • Question 4
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    Metal \((\mathrm{M})+\operatorname{air} \stackrel{\Delta}{\longrightarrow}(\mathrm{A}) \stackrel{\mathrm{H}_{2} \mathrm{O}}{\longrightarrow}(\mathrm{B}) \stackrel{\mathrm{HCl}}{\longrightarrow}\) White fumes. Metal (M) can be

  • Question 5
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    Titration of I2 produced from 0.1045 g of primary standard KIO3 required 30.72 mL of sodium thiosulphate as shown below :

    \(\mathrm{IO}_{3}^{-}+5 \mathrm{I}^{-}+6 \mathrm{H}^{+} \longrightarrow 3 \mathrm{I}_{2}+3 \mathrm{H}_{2} \mathrm{O}\)

    \(\mathrm{I}_{2}+2 \mathrm{S}_{2} \mathrm{O}_{3}^{2-} \longrightarrow 2 \mathrm{I}^{-}+\mathrm{S}_{4} \mathrm{O}_{6}^{2-}\)

    The molarity of sodium thiosulphate ion is :

  • Question 6
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    What is the pH of 0.01 M glycine solution?
    [For glycine, \(\boldsymbol{K}_{a_{1}}=4.5 \times 10^{-3}\) and \(\boldsymbol{K}_{a_{2}}=1.72 \times 10^{-10}\) at \(\left.298 \mathrm{k}\right]\)

  • Question 7
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    An element has fcc structure with edge length 200 pm, calculate the density if 200g of this element contains 24 × 1023 atoms. (NA =  6 × 1023​)

  • Question 8
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    The treatment of \(C H_{3} M g X\) with \(C H_{3} C \equiv C-H\) produces:

  • Question 9
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    A 50 litre vessel is equally divided into three parts with the help of two stationary semi permeable membrane (SPM). The vessel contains 60 g H2  gas in the left chamber, 160 g O2 in the middle and 140 g N2 in the right one. The left SPM allows transfer of only H2  gas while the right one allows the transfer of both H2 and N2 . The final ratio of pressure in the three chambers.

  • Question 10
    1 / -0

    A compound that gives a positive iodoform test is:

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