Chemistry Test ...

In the reaction \(4 \mathrm{Fe}+3 \mathrm{O}_{2} \rightarrow 4 \mathrm{Fe}^{3+}+6 O^{2-}\) which of the following statements is incorrect?

Calculate e.m.f of the following cell at \(298 \mathrm{~K}\) :

\(2 \mathrm{Cr}(\mathrm{s})+3 \mathrm{Fe}^{2+}(0.1 \mathrm{M}) \rightarrow 2 \mathrm{Cr}^{3+}(0.01 \mathrm{M})+3 \mathrm{Fe}(\mathrm{s})\)

Given: \(\mathrm{E}^{\circ}\left(\mathrm{Cr}^{3+} \mid \mathrm{Cr}\right)=-0.74 \mathrm{VE}^{\circ}\left(\mathrm{Fe}^{2+} \mid \mathrm{Fe}\right)=-0.44 \mathrm{~V}\)

The helical structure of protein is stabilized by:

Match the following :

L-isomer of tetrose \(\mathrm{X}\left(\mathrm{C}_4 \mathrm{H}_8 \mathrm{O}_4\right)\) gives positive schiff's test and has two chiral carbons. On acetylation. ' \(\mathrm{X}\) ' yields triacetate. ' \(\mathrm{X}\) ' undergoes following reactions

' \(\mathrm{X}\) ' is

\(1.22 \mathrm{~g}\) of an organic acid is separately dissolved in \(100 \mathrm{~g}\) of benzene \(\left(\mathrm{K}_{\mathrm{b}}=2.6 \mathrm{~K} \mathrm{~kg} \mathrm{~mol}^{-1}\right)\) and \(100 \mathrm{~g}\) of acetone \(\left(\mathrm{K}_{\mathrm{b}}=1.7 \mathrm{Kkg} \mathrm{mol}^{-1}\right)\). The acid is known to dimerise in benzene but remain as a monomer in acetone. The boiling point of the solution in acetone increases by \(0.17^{\circ} \mathrm{C}\). The increase in boiling point of solution in benzene in \({ }^{\circ} \mathrm{C}\) is \(\mathrm{x} \times 10^{-2}\). The value of \(\mathrm{x}\) is....... (Nearest integer)

[Atomic mass: \(\mathrm{C}=12.0, \mathrm{H}=1.0, \mathrm{O}=16.0\) ]

For a 1^st order reaction, if the concentration is doubled then the rate of reaction becomes:

When \(\mathrm{KMnO}_{4}\) solution is added to oxalic acid solution, the decolourisation is slow in the beginning but becomes instantaneous after some time because:

Which of the following statement is correct?

For the process to occur under adiabatic conditions, the correct conditionis: