The vapour pressure of an aqueous solution of a non-volatile solute which boils at \(101.56^\circ C\) at \(25^\circ C\) will be (V.P. of pure water at \(25^\circ C\) is \(200\ mmHg\) and \(K_b\) for water is \(0.52\ K\ kg\ mol^{-1}\)):

\(CH_3CH_2OH \xrightarrow[413\ K]{H_2SO_4}\) A. Identify "A" and mention the name of mechanism through which it is formed?

The complex \([\text{Co(NH}_3)_4(\text{NO}_2)_2]\text{Cl}\) exhibits :
A. Coordination isomerism
B. Linkage isomerism
C. Solvate isomerism
D. Ionisation isomerism
E. Geometrical isomerism
Choose the correct answer from the options given below :

Which of the following reactions has fractional order with respect to one of the reactants?

"Answer the question on basis of passage given below :
Carboxylic acids are weaker than mineral acids, but they are stronger acids than alcohols and many simple phenols (\(\text{pKa}\) is ~ 16 for ethanol and 10 for phenol). The higher acidity of carboxylic acids as compared to phenols can be understood similarly. The conjugate base of carboxylic acid, a carboxylate ion, is stabilised by two equivalent resonance structures in which the negative charge is at the more electronegative oxygen atom. The conjugate base of phenol, a phenoxide ion, has non-equivalent resonance structures in which the negative charge is at the less electronegative carbon atom. Further, the negative charge is delocalised over two electronegative oxygen atoms in carboxylate ion whereas it is less effectively delocalised over one oxygen atom and less electronegative carbon atoms in phenoxide ion. Thus, the carboxylate ion is more estabilised than phenoxide ion, so carboxylic acids are more acidic than phenols.
Effect of substituents on the acidity of carboxylic acids: substituents may affect the stabliity of the conjugate base and thus, also affect the acidity of the carboxylic acids. Electron withdrawing group increase the acidity of carboxylic acids by stabilising the conjugate base through delocalisation of the negative charge by inductive and/or resonance effects. Conversely, electron donating groups decrease the acidity by destabilising the conjugate base.
Which of the following compounds would have the smallest value of \(\text{pKa}\)?"

Which of the following reagents can bring about the given conversion?
3-Nitrobromobenzene to 3-Nitrobenzoic acid

Mercury is not considered as transition metal however it has tendency to react with chlorine to form chlorides \(X\) and \(Y\).
\(X\) reacts with \(K I\) to give red ppt while \(Y\) doesn't react. On the contrary, \(Y\) reacts with \(NH _4 OH\) to give a black ppt. Predict the formula of \(X\) and \(Y\) :

If \(\vec{a}, \vec{b}, \vec{c}\) are vectors such that \(\vec{a}+\vec{b}+\vec{c}=\overrightarrow{0}\) and \(|\vec{a}|=1,|\vec{b}|=2,|\vec{c}|=5\), then the expression \(\vec{a} \cdot \vec{b}+\vec{b} \cdot \vec{c}+\vec{c} \cdot \vec{a}\) equals

Identify the hormone releasing IUDs -

The conversions which are represented correctly are
(A)

(B)

(C)

(D)

Choose the correct answer from the options given below:

Single step large mutation is called as:

\( (1/16) \)th of the initial amount of a certain radio-active isotope remains undecayed after two hours. The half life of the isotope would be :

Which of the following is only composed of exons?