285476
The IUPAC name of the complex ion formed when gold dissolves in aqua regia is
1 tetrachloridoaurate (III)
2 tetrachloridoaurate (I)
3 tetrachloridoaurate (II)
4 dichloridoaurate (III)
Explanation:
(a) When gold dissolves in aqua regia, it gives tetrachloridoaurate (III) anion.
\(\begin{aligned}
& 2 \mathrm{Au}+3 \mathrm{HNO}_3+11 \mathrm{HCl} \rightarrow \\
& 2 \mathrm{H}\left[\mathrm{AuCl}_4\right]+3 \mathrm{NOCl}+6 \mathrm{H}_2 \mathrm{O}
\end{aligned}\)
Karnataka CET 2014
CHEMISTRY(KCET)
285477
Which one of these is not known?
1 \(\mathrm{CuCl}_2\)
2 \(\mathrm{CuI}_2\)
3 \(\mathrm{CuF}_2\)
4 \(\mathrm{CuBr}_2\)
Explanation:
(b) All copper (II) halides are known except cupric iodide\(\left(\mathrm{CuI}_2\right)\) which rapidly decomposes to cuprous iodide, \(\mathrm{Cu}_2 \mathrm{I}_2\) and \(\mathrm{I}_2\).
\(2 \mathrm{CuI}_2 \rightarrow \mathrm{Cu}_2 \mathrm{I}_2+\mathrm{I}_2\)
Karnataka CET 2014
CHEMISTRY(KCET)
285478
The correct statement is
1 the earlier members of lanthanoid series resemble calcium in their chemical properties
2 the extent of actinoid contraction is almost the same as lanthanoid contraction
3 in general, lanthanoids and actinoids do not show variable oxidation states
4 \(\mathrm{Ce}^{4+}\) in aqueous solution is not known.
285476
The IUPAC name of the complex ion formed when gold dissolves in aqua regia is
1 tetrachloridoaurate (III)
2 tetrachloridoaurate (I)
3 tetrachloridoaurate (II)
4 dichloridoaurate (III)
Explanation:
(a) When gold dissolves in aqua regia, it gives tetrachloridoaurate (III) anion.
\(\begin{aligned}
& 2 \mathrm{Au}+3 \mathrm{HNO}_3+11 \mathrm{HCl} \rightarrow \\
& 2 \mathrm{H}\left[\mathrm{AuCl}_4\right]+3 \mathrm{NOCl}+6 \mathrm{H}_2 \mathrm{O}
\end{aligned}\)
Karnataka CET 2014
CHEMISTRY(KCET)
285477
Which one of these is not known?
1 \(\mathrm{CuCl}_2\)
2 \(\mathrm{CuI}_2\)
3 \(\mathrm{CuF}_2\)
4 \(\mathrm{CuBr}_2\)
Explanation:
(b) All copper (II) halides are known except cupric iodide\(\left(\mathrm{CuI}_2\right)\) which rapidly decomposes to cuprous iodide, \(\mathrm{Cu}_2 \mathrm{I}_2\) and \(\mathrm{I}_2\).
\(2 \mathrm{CuI}_2 \rightarrow \mathrm{Cu}_2 \mathrm{I}_2+\mathrm{I}_2\)
Karnataka CET 2014
CHEMISTRY(KCET)
285478
The correct statement is
1 the earlier members of lanthanoid series resemble calcium in their chemical properties
2 the extent of actinoid contraction is almost the same as lanthanoid contraction
3 in general, lanthanoids and actinoids do not show variable oxidation states
4 \(\mathrm{Ce}^{4+}\) in aqueous solution is not known.
285476
The IUPAC name of the complex ion formed when gold dissolves in aqua regia is
1 tetrachloridoaurate (III)
2 tetrachloridoaurate (I)
3 tetrachloridoaurate (II)
4 dichloridoaurate (III)
Explanation:
(a) When gold dissolves in aqua regia, it gives tetrachloridoaurate (III) anion.
\(\begin{aligned}
& 2 \mathrm{Au}+3 \mathrm{HNO}_3+11 \mathrm{HCl} \rightarrow \\
& 2 \mathrm{H}\left[\mathrm{AuCl}_4\right]+3 \mathrm{NOCl}+6 \mathrm{H}_2 \mathrm{O}
\end{aligned}\)
Karnataka CET 2014
CHEMISTRY(KCET)
285477
Which one of these is not known?
1 \(\mathrm{CuCl}_2\)
2 \(\mathrm{CuI}_2\)
3 \(\mathrm{CuF}_2\)
4 \(\mathrm{CuBr}_2\)
Explanation:
(b) All copper (II) halides are known except cupric iodide\(\left(\mathrm{CuI}_2\right)\) which rapidly decomposes to cuprous iodide, \(\mathrm{Cu}_2 \mathrm{I}_2\) and \(\mathrm{I}_2\).
\(2 \mathrm{CuI}_2 \rightarrow \mathrm{Cu}_2 \mathrm{I}_2+\mathrm{I}_2\)
Karnataka CET 2014
CHEMISTRY(KCET)
285478
The correct statement is
1 the earlier members of lanthanoid series resemble calcium in their chemical properties
2 the extent of actinoid contraction is almost the same as lanthanoid contraction
3 in general, lanthanoids and actinoids do not show variable oxidation states
4 \(\mathrm{Ce}^{4+}\) in aqueous solution is not known.
