List of top Chemistry Questions on Some Important Compounds of Transition Elements asked in KEAM

Which of the following is used to convert sodium chromate to sodium dichromate in the preparation of potassium dichromate?

First element in 3d series which shows +2, +3, +4, +6 oxidation state

Number of C−C, C−H, C=C in But-2-ene-1-yne respectively

The IUPAC name of the complex \( [\text{Cr(NH}_3)_3(\text{H}_2\text{O})_3]\text{Cl}_3 \) is:

The standard molar entropies of \( \text{SO}_2(g) \), \( \text{SO}_3(g) \), and \( \text{O}_2(g) \) are:

• \( S^\circ_{\text{SO}_2} = 250 \) J/K·mol
• \( S^\circ_{\text{SO}_3} = 257 \) J/K·mol
• \( S^\circ_{\text{O}_2} = 205 \) J/K·mol

Calculate the standard molar entropy change for the reaction:

\[ 2\text{SO}_2(g) + \text{O}_2(g) \rightarrow 2\text{SO}_3(g) \]

The standard entropy change (\( \Delta S^\circ \)) is given by:

\[ \Delta S^\circ = \sum S^\circ_{\text{products}} - \sum S^\circ_{\text{reactants}} \]