Question
Primary or aliphatic amine is a stronger base than ammonia. Explain.
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Boiling point of a solvent is $80.2^{\circ} C$. When $0.419 g$ of the solute of molar mass $252.4 g mol ^{-1}$ is dissolved in $75 g$ of the above solvent, the boiling point of the solution is found to be $80.256^{\circ} C$. Find the molal elevation constant.
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Calculate $\Delta H^0$ for the following reaction:
$2 H _3 BO _{3( aq )} \longrightarrow B _2 O _{3( s )}+3 H _2 O _{( l )}$
Given that: $(a) H _3 BO _{3( aq )} \longrightarrow HBO _{2( aq )}+ H _2 O _{(l)}, \Delta H_1^0=-0.02 \ kJ$
$(b) H _2 B _4 O _{7( s )} \longrightarrow 2 B _2 O _{3( s )}+ H _2 O _{(l)}, \Delta H_2^0=17.3 \ kJ$
$(c) H _2 B _4 O _{7( s )}+ H _2 O _{( b )} \longrightarrow 4 HBO _{2( aq )}, \Delta H_3^0=-11.58 \ kJ$
→$2 H _3 BO _{3( aq )} \longrightarrow B _2 O _{3( s )}+3 H _2 O _{( l )}$
Given that: $(a) H _3 BO _{3( aq )} \longrightarrow HBO _{2( aq )}+ H _2 O _{(l)}, \Delta H_1^0=-0.02 \ kJ$
$(b) H _2 B _4 O _{7( s )} \longrightarrow 2 B _2 O _{3( s )}+ H _2 O _{(l)}, \Delta H_2^0=17.3 \ kJ$
$(c) H _2 B _4 O _{7( s )}+ H _2 O _{( b )} \longrightarrow 4 HBO _{2( aq )}, \Delta H_3^0=-11.58 \ kJ$
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a. The polynucleotide is double stranded. ( …………… )
b. The polynucleotide contains uracil. ( …………… )
c. The polynucleotide contains D-ribose ( …………… ).
d. The polynucleotide contains Guanine ( …………… ).
a. The polynucleotide is double stranded. ( …………… )
b. The polynucleotide contains uracil. ( …………… )
c. The polynucleotide contains D-ribose ( …………… ).
d. The polynucleotide contains Guanine ( …………… ).
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(a) Bromine water (b) Acetic anhydride (c) Hot and conc. sulphuric acid.
(a) Bromine water (b) Acetic anhydride (c) Hot and conc. sulphuric acid.