Question
Explain laboratory test for amines.
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Calculate ∆H0 for the following reaction at 298 K
$H_2B_4O_{7(s)} + H_2O_{(l)} \rightarrow 4HBO_{2(aq)}$
i. $2H_3BO_{3(aq)} \rightarrow B_2O_{3(s)} + 3H_2O_{(l)}, \triangle H^0 = 14.4 kJ mol^{-1}$
ii. $H_3BO_{3(aq)} \rightarrow HBO_{2(aq)} + H_2O_{(l)}, \triangle H^0 = -0.02 kJ mol^{-1}$
iii. $H_2B_4O_{7(s)} \rightarrow 2B_2O_{3(s)} + H_2O_{(l)}, \triangle H^0 = 17.3 kJ mol^{-1}$
→$H_2B_4O_{7(s)} + H_2O_{(l)} \rightarrow 4HBO_{2(aq)}$
i. $2H_3BO_{3(aq)} \rightarrow B_2O_{3(s)} + 3H_2O_{(l)}, \triangle H^0 = 14.4 kJ mol^{-1}$
ii. $H_3BO_{3(aq)} \rightarrow HBO_{2(aq)} + H_2O_{(l)}, \triangle H^0 = -0.02 kJ mol^{-1}$
iii. $H_2B_4O_{7(s)} \rightarrow 2B_2O_{3(s)} + H_2O_{(l)}, \triangle H^0 = 17.3 kJ mol^{-1}$
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When gold crystallizes, it forms face-centred cubic cell. The unit cell edge length is 408 pm .
Calculate the density of gold. [Molar mass of gold $=197 g \ mole ^{-1}$ ]
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Which flower is an example of self cleaning?
Write the monomer used for preparation of PVC.
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