Chemistry Test ...

Functional group -CHO is present in which of the following?

All alkali metals are good dash agents?

Solid \({Ba}\left({NO}_{3}\right)_{2}\) is gradually dissolved in a \(1.0 \times 10^{-4} {M} {Na}_{2} {CO}_{3}\) solution. At which concentration of \({Ba}^{2+}\), precipitate of \({BaCO}_{3}\) begins to form?

\(\left({K}_{{sp}}\right.\) for \(\left.{BaCO}_{3}=5.1 \times 10^{-9}\right)\)

Identify the element with the atomic number 10.

How does the surface tension of a liquid vary with increase in temperature?

The enthalpy and entropy change for the reaction:

\(\mathrm{Br}_{2}(l)+\mathrm{Cl}_{2}(\mathrm{~g}) \rightarrow 2 \mathrm{BrCl}(\mathrm{g})\) are \(30 \mathrm{kJ} \mathrm{mol}^{-1}\) and \(105 \mathrm{JK}^{-1} \mathrm{mol}^{-1}\) respectively.

The temperature at which the reaction will be in equilibrium is:

In nitroprusside ion, the iron and NO exist as Fe(II) and \(NO^{+}\) rather than Fe(III) and NO. These forms can be distinguished by:

\(12 {~g}\) of urea is present in 1 litre of solution and \(68.4 {~g}\) of sucrose is separately dissolved in 1 litre of another sample of solution. The lowering of vapour pressure of first solution is:

Sustainable development focuses on more use of ___________.

Which of the following is a molecular solid?