Chemistry Test ...

Determine the empirical formula of an oxide of iron which has \(69.9 \%\) iron and \(30.1 \%\) dioxygen by mass.

\(\mathrm{C}_{2} \mathrm{H}_{6}\) compound has:

The name of the compound:

\(\mathrm{CH}_{3}-\mathrm{CH}_{2}-\mathrm{CHO}\)

On complete combustion of \(0.492 \mathrm{~g}\) of an organic compound containing \(\mathrm{C}, \mathrm{H}\) and \(\mathrm{O}, 0.7938 \mathrm{~g}\) of \(\mathrm{CO}_2\) and \(0.4428 \mathrm{~g}\) of \(\mathrm{H}_2 \mathrm{O}\) was produced. The \(\%\) composition of oxygen in the compound is

The solubility product of \(\mathrm{Pbl}_2\) is \(8.0 \times 10^{-9}\). The solubility of lead iodide in 0.1 molar solution of lead nitrate is \(\mathrm{x} \times 10^{-6} \mathrm{~mol} / \mathrm{L}\). The value of \(\mathrm{x}\) is ....... (Rounded off to the nearest integer).

[Given, \(: \sqrt{2}=1.41\) ]

Transition metal compounds are usually coloured. This is due to the electronic transition:

Molecules of benzoic acid \(\left(\mathrm{C}_6 \mathrm{H}_5 \mathrm{COOH}\right)\) dimerise in benzene. ' \(\mathrm{w}\) ' \(\mathrm{g}\) of the acid dissolved in \(30 \mathrm{~g}\) of benzene shows a depression in freezing point equal to \(2 \mathrm{~K}\). If the percentage association of the acid to form dimer in the solution is 80 , then \(w\) is :

(Given that \(\mathrm{K}_{\mathrm{f}}=5 \mathrm{~K} \mathrm{kgmol}^{-1}\), Molar mass of benzoic acid \(=122 \mathrm{gmol}^{-1}\) )

A reaction, \(\mathrm{A+B \rightarrow C+D+q}\) is found to have a positive entropy change.The reaction will be:

Among the following mixtures, dipole-dipole as the major interaction is present in:

Most acidic hydrogen is present in: