VITEEE 2018 :: Chemistry :: General questions

• Chemistry - General questions

Acetic anhydride reacts with diethyl ether in the presence of anhydrous AlCl₃ to give :

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Explanation:

HBr reacts with CH₂ = CH - OCH₃ under anhydrous conditions at room temperature to give

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Explanation:

Methyl vinyl ether under anhydrous condition at room temperature undergoes additional reaction

Standard cell voltage for the cell Pb | Pb²⁺ ll Sn²⁺ | Sn is - 0.01 V. If the cell is to exhibit E_Cell  = 0, the value of [Sn²⁺]/ [Pb²⁺] should be antilog of -

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Explanation:

Apply Nernst equation to the reaction

$ Pb +Sn^{2+}\rightarrow Pb^{2+}+Sn$

Or $ E^{\circ}+\frac{0.059}{2}\log_{}{}\frac{\left[Sn^{2+}\right]}{\left[Pb^{2+}\right]} =E_{Cell}$

Or $log_{}{}\frac{\left[Sn^{2+}\right]}{\left[Pb^{2+}\right]} = \frac{0.01\times2}{0.059}=0.3(\because E_{Cell} =0)$

Or $\frac{\left[Sn^{2+}\right]}{\left[Pb^{2+}\right]} = antilog(0.3)$

The major product of the following reaction is

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Explanation:

An element occuring in the bcc structure has 12.08 x 10²³ unit cells. The total number of atoms of the element in these cells will be

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Explanation:

There are two atoms in a bcc unitcell. So, number of atoms in 12.08 x 10²³ unit cells = 2 x 12.08 x 10²³ = 24.16 x 10²³ atoms.

• Chemistry - General questions