285459
How many moles of acidified\(\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7\) is required to liberate 6 moles of \(\mathrm{I}_2\) from an aqueous solution of \(\mathrm{I}^{-}\)?
1 1
2 0.25
3 0.5
4 2
Explanation:
(d)\(\mathrm{Cr}_2 \mathrm{O}_7^{2-}+14 \mathrm{H}^{+}+6 \mathrm{I}^{-} \rightarrow\)
\(2 \mathrm{Cr}^{3+}+3 \mathrm{I}_2+7 \mathrm{H}_2 \mathrm{O}\)
3 moles of \(\mathrm{I}_2\) is produced from 1 mol of \(\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7\).
\(\therefore 6\) moles of \(\mathrm{I}_2\) will produce from 2 mol of \(\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7\).
The \(d\)-and \(f\)-Block Elements
c-73
Karnataka CET 2020
CHEMISTRY(KCET)
285460
\(\mathrm{Cu}_2 \mathrm{Cl}_2\) and \(\mathrm{CuCl}_2\) in aqueous medium
1 stability of\(\mathrm{Cu}_2 \mathrm{Cl}_2\) is equal to stability of \(\mathrm{CuCl}_2\)
2 both are unstable
3 \(\mathrm{Cu}_2 \mathrm{Cl}_2\) is more stable than \(\mathrm{CuCl}_2\)
4 \(\mathrm{CuCl}_2\) is more stable than \(\mathrm{Cu}_2 \mathrm{Cl}_2\).
Explanation:
(d)\(\mathrm{CuCl}_2\) is more stable that \(\mathrm{Cu}_2 \mathrm{Cl}_2\) due to smaller size and high hydration enthalpy. (Smaller the size of cation, more will be the hydration enthalpy.)
Karnataka CET 2020
CHEMISTRY(KCET)
285461
The elements in which electrons are progressively filled in\(4 f\) orbital are called
1 actinoids
2 transition elements
3 lanthanoids
4 halogens.
Explanation:
(c)
Karnataka CET 2019
CHEMISTRY(KCET)
285462
Incorrect statement with reference to\(\mathrm{Ce}(Z=58)\).
1 \(\mathrm{Ce}^{4+}\) is a reducing agent.
#[examname: Karnataka CET 2019]#
2 Ce in +3 oxidation state is more stable than in +4 .
The \(\boldsymbol{d}\)-and \(\boldsymbol{f}\)-Block Elements
c-41
285459
How many moles of acidified\(\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7\) is required to liberate 6 moles of \(\mathrm{I}_2\) from an aqueous solution of \(\mathrm{I}^{-}\)?
1 1
2 0.25
3 0.5
4 2
Explanation:
(d)\(\mathrm{Cr}_2 \mathrm{O}_7^{2-}+14 \mathrm{H}^{+}+6 \mathrm{I}^{-} \rightarrow\)
\(2 \mathrm{Cr}^{3+}+3 \mathrm{I}_2+7 \mathrm{H}_2 \mathrm{O}\)
3 moles of \(\mathrm{I}_2\) is produced from 1 mol of \(\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7\).
\(\therefore 6\) moles of \(\mathrm{I}_2\) will produce from 2 mol of \(\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7\).
The \(d\)-and \(f\)-Block Elements
c-73
Karnataka CET 2020
CHEMISTRY(KCET)
285460
\(\mathrm{Cu}_2 \mathrm{Cl}_2\) and \(\mathrm{CuCl}_2\) in aqueous medium
1 stability of\(\mathrm{Cu}_2 \mathrm{Cl}_2\) is equal to stability of \(\mathrm{CuCl}_2\)
2 both are unstable
3 \(\mathrm{Cu}_2 \mathrm{Cl}_2\) is more stable than \(\mathrm{CuCl}_2\)
4 \(\mathrm{CuCl}_2\) is more stable than \(\mathrm{Cu}_2 \mathrm{Cl}_2\).
Explanation:
(d)\(\mathrm{CuCl}_2\) is more stable that \(\mathrm{Cu}_2 \mathrm{Cl}_2\) due to smaller size and high hydration enthalpy. (Smaller the size of cation, more will be the hydration enthalpy.)
Karnataka CET 2020
CHEMISTRY(KCET)
285461
The elements in which electrons are progressively filled in\(4 f\) orbital are called
1 actinoids
2 transition elements
3 lanthanoids
4 halogens.
Explanation:
(c)
Karnataka CET 2019
CHEMISTRY(KCET)
285462
Incorrect statement with reference to\(\mathrm{Ce}(Z=58)\).
1 \(\mathrm{Ce}^{4+}\) is a reducing agent.
#[examname: Karnataka CET 2019]#
2 Ce in +3 oxidation state is more stable than in +4 .
The \(\boldsymbol{d}\)-and \(\boldsymbol{f}\)-Block Elements
c-41
285459
How many moles of acidified\(\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7\) is required to liberate 6 moles of \(\mathrm{I}_2\) from an aqueous solution of \(\mathrm{I}^{-}\)?
1 1
2 0.25
3 0.5
4 2
Explanation:
(d)\(\mathrm{Cr}_2 \mathrm{O}_7^{2-}+14 \mathrm{H}^{+}+6 \mathrm{I}^{-} \rightarrow\)
\(2 \mathrm{Cr}^{3+}+3 \mathrm{I}_2+7 \mathrm{H}_2 \mathrm{O}\)
3 moles of \(\mathrm{I}_2\) is produced from 1 mol of \(\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7\).
\(\therefore 6\) moles of \(\mathrm{I}_2\) will produce from 2 mol of \(\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7\).
The \(d\)-and \(f\)-Block Elements
c-73
Karnataka CET 2020
CHEMISTRY(KCET)
285460
\(\mathrm{Cu}_2 \mathrm{Cl}_2\) and \(\mathrm{CuCl}_2\) in aqueous medium
1 stability of\(\mathrm{Cu}_2 \mathrm{Cl}_2\) is equal to stability of \(\mathrm{CuCl}_2\)
2 both are unstable
3 \(\mathrm{Cu}_2 \mathrm{Cl}_2\) is more stable than \(\mathrm{CuCl}_2\)
4 \(\mathrm{CuCl}_2\) is more stable than \(\mathrm{Cu}_2 \mathrm{Cl}_2\).
Explanation:
(d)\(\mathrm{CuCl}_2\) is more stable that \(\mathrm{Cu}_2 \mathrm{Cl}_2\) due to smaller size and high hydration enthalpy. (Smaller the size of cation, more will be the hydration enthalpy.)
Karnataka CET 2020
CHEMISTRY(KCET)
285461
The elements in which electrons are progressively filled in\(4 f\) orbital are called
1 actinoids
2 transition elements
3 lanthanoids
4 halogens.
Explanation:
(c)
Karnataka CET 2019
CHEMISTRY(KCET)
285462
Incorrect statement with reference to\(\mathrm{Ce}(Z=58)\).
1 \(\mathrm{Ce}^{4+}\) is a reducing agent.
#[examname: Karnataka CET 2019]#
2 Ce in +3 oxidation state is more stable than in +4 .
The \(\boldsymbol{d}\)-and \(\boldsymbol{f}\)-Block Elements
c-41
285459
How many moles of acidified\(\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7\) is required to liberate 6 moles of \(\mathrm{I}_2\) from an aqueous solution of \(\mathrm{I}^{-}\)?
1 1
2 0.25
3 0.5
4 2
Explanation:
(d)\(\mathrm{Cr}_2 \mathrm{O}_7^{2-}+14 \mathrm{H}^{+}+6 \mathrm{I}^{-} \rightarrow\)
\(2 \mathrm{Cr}^{3+}+3 \mathrm{I}_2+7 \mathrm{H}_2 \mathrm{O}\)
3 moles of \(\mathrm{I}_2\) is produced from 1 mol of \(\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7\).
\(\therefore 6\) moles of \(\mathrm{I}_2\) will produce from 2 mol of \(\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7\).
The \(d\)-and \(f\)-Block Elements
c-73
Karnataka CET 2020
CHEMISTRY(KCET)
285460
\(\mathrm{Cu}_2 \mathrm{Cl}_2\) and \(\mathrm{CuCl}_2\) in aqueous medium
1 stability of\(\mathrm{Cu}_2 \mathrm{Cl}_2\) is equal to stability of \(\mathrm{CuCl}_2\)
2 both are unstable
3 \(\mathrm{Cu}_2 \mathrm{Cl}_2\) is more stable than \(\mathrm{CuCl}_2\)
4 \(\mathrm{CuCl}_2\) is more stable than \(\mathrm{Cu}_2 \mathrm{Cl}_2\).
Explanation:
(d)\(\mathrm{CuCl}_2\) is more stable that \(\mathrm{Cu}_2 \mathrm{Cl}_2\) due to smaller size and high hydration enthalpy. (Smaller the size of cation, more will be the hydration enthalpy.)
Karnataka CET 2020
CHEMISTRY(KCET)
285461
The elements in which electrons are progressively filled in\(4 f\) orbital are called
1 actinoids
2 transition elements
3 lanthanoids
4 halogens.
Explanation:
(c)
Karnataka CET 2019
CHEMISTRY(KCET)
285462
Incorrect statement with reference to\(\mathrm{Ce}(Z=58)\).
1 \(\mathrm{Ce}^{4+}\) is a reducing agent.
#[examname: Karnataka CET 2019]#
2 Ce in +3 oxidation state is more stable than in +4 .
The \(\boldsymbol{d}\)-and \(\boldsymbol{f}\)-Block Elements
c-41
