274401
When dil. $\mathrm{H}_{2} \mathrm{SO}_{4}$ is added to aqueous solution of Potassium chromate, yellow colour of solution turns to orange colour. It indicates........
1 Chromate ions are reduced.
2 Chromate ions are oxidized.
3 Mono centric complex is converted into dicentric complex.
4 Oxygen gets removed from chromate ions.
Explanation:
(C) : When dil. $\mathrm{H}_{2} \mathrm{SO}_{4}$ is added to the yellow solution of $\mathrm{K}_{2} \mathrm{CrO}_{4}$ yellow colour changes to orange red due to the formation of $\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}$ $2 \mathrm{~K}_{2} \mathrm{CrO}_{4}+\mathrm{H}_{2} \mathrm{SO}_{4} \rightarrow \mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}+\mathrm{K}_{2} \mathrm{SO}_{4}+\mathrm{H}_{2} \mathrm{O}$ The above reaction shows that the monocentric complex $\left(\mathrm{K}_{2} \mathrm{CrO}_{4}\right)$ is converted into dicentric $\left(\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}\right)$ complex.
GUJCET-2011
COORDINATION COMPOUNDS
274381
Which of the following complex ions absorbs the light of minimum wavelength?
(C) : Wavelength of light absorbed $\propto$ $\frac{1}{\text { Stability of complex }}$ In all given complexes $\mathrm{Co}$ is present in +3 state and among the given ligands $(\mathrm{CN})^{-}$is the strongest ligand. $\left[\mathrm{Co}(\mathrm{CN})_{6}\right]^{3-}$ is most stable, thus it absorbs light of minimum wavelength.
GUJCET-2017
COORDINATION COMPOUNDS
274384
The deep blue color produced on adding excess of ammonia to copper sulphate due to presence of
(B) : $\mathrm{CuSO}_{4}$ react with excess $\mathrm{NH}_{3}$ to form $\left[\mathrm{Cu}\left(\mathrm{NH}_{3}\right)_{4}\right](\mathrm{OH})_{2}$ with deep colour. $\mathrm{CuSO}_{4}+4 \mathrm{NH}_{3} \longrightarrow\left[\mathrm{Cu}\left(\mathrm{NH}_{3}\right)_{4}\right] \mathrm{SO}_{4}$ Blue complex due to $\left[\mathrm{Cu}\left(\mathrm{NH}_{3}\right)_{4}\right]^{2+}$
AIIMS-2016
COORDINATION COMPOUNDS
274389
When $\mathrm{H}_{2} \mathrm{O}_{2}$ is added to ice cold solution of acidified potassium dichromate in ether and the contents are shaken and allowed to stand
1 a blue colour is obtained in ether because of formation of $\mathrm{CrO}_{5}$
2 a blue colour is obtained in ether because of formation of $\mathrm{CrO}_{3}$
3 a blue colour is obtained in ether because of formation of $\mathrm{Cr}_{2}\left(\mathrm{SO}_{4}\right)_{3}$
4 chromyl chloride is formed
Explanation:
(A) : When $\mathrm{H}_{2} \mathrm{O}_{2}$ is added to acidified potassium dichromate in others solution potassium dichromate is oxidized to blue perioxide of chromium $\left(\mathrm{CrO}_{5}\right)$ which is soluble in ether and produces blue coloured solution. $\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}+\mathrm{H}_{2} \mathrm{~S}_{2} \mathrm{O}_{4}+4 \mathrm{H}_{2} \mathrm{O}_{2} \longrightarrow 2 \mathrm{CrO}_{5}+\mathrm{K}_{2} \mathrm{SO}_{4}+5 \mathrm{H}_{2} \mathrm{O}$
274401
When dil. $\mathrm{H}_{2} \mathrm{SO}_{4}$ is added to aqueous solution of Potassium chromate, yellow colour of solution turns to orange colour. It indicates........
1 Chromate ions are reduced.
2 Chromate ions are oxidized.
3 Mono centric complex is converted into dicentric complex.
4 Oxygen gets removed from chromate ions.
Explanation:
(C) : When dil. $\mathrm{H}_{2} \mathrm{SO}_{4}$ is added to the yellow solution of $\mathrm{K}_{2} \mathrm{CrO}_{4}$ yellow colour changes to orange red due to the formation of $\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}$ $2 \mathrm{~K}_{2} \mathrm{CrO}_{4}+\mathrm{H}_{2} \mathrm{SO}_{4} \rightarrow \mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}+\mathrm{K}_{2} \mathrm{SO}_{4}+\mathrm{H}_{2} \mathrm{O}$ The above reaction shows that the monocentric complex $\left(\mathrm{K}_{2} \mathrm{CrO}_{4}\right)$ is converted into dicentric $\left(\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}\right)$ complex.
GUJCET-2011
COORDINATION COMPOUNDS
274381
Which of the following complex ions absorbs the light of minimum wavelength?
(C) : Wavelength of light absorbed $\propto$ $\frac{1}{\text { Stability of complex }}$ In all given complexes $\mathrm{Co}$ is present in +3 state and among the given ligands $(\mathrm{CN})^{-}$is the strongest ligand. $\left[\mathrm{Co}(\mathrm{CN})_{6}\right]^{3-}$ is most stable, thus it absorbs light of minimum wavelength.
GUJCET-2017
COORDINATION COMPOUNDS
274384
The deep blue color produced on adding excess of ammonia to copper sulphate due to presence of
(B) : $\mathrm{CuSO}_{4}$ react with excess $\mathrm{NH}_{3}$ to form $\left[\mathrm{Cu}\left(\mathrm{NH}_{3}\right)_{4}\right](\mathrm{OH})_{2}$ with deep colour. $\mathrm{CuSO}_{4}+4 \mathrm{NH}_{3} \longrightarrow\left[\mathrm{Cu}\left(\mathrm{NH}_{3}\right)_{4}\right] \mathrm{SO}_{4}$ Blue complex due to $\left[\mathrm{Cu}\left(\mathrm{NH}_{3}\right)_{4}\right]^{2+}$
AIIMS-2016
COORDINATION COMPOUNDS
274389
When $\mathrm{H}_{2} \mathrm{O}_{2}$ is added to ice cold solution of acidified potassium dichromate in ether and the contents are shaken and allowed to stand
1 a blue colour is obtained in ether because of formation of $\mathrm{CrO}_{5}$
2 a blue colour is obtained in ether because of formation of $\mathrm{CrO}_{3}$
3 a blue colour is obtained in ether because of formation of $\mathrm{Cr}_{2}\left(\mathrm{SO}_{4}\right)_{3}$
4 chromyl chloride is formed
Explanation:
(A) : When $\mathrm{H}_{2} \mathrm{O}_{2}$ is added to acidified potassium dichromate in others solution potassium dichromate is oxidized to blue perioxide of chromium $\left(\mathrm{CrO}_{5}\right)$ which is soluble in ether and produces blue coloured solution. $\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}+\mathrm{H}_{2} \mathrm{~S}_{2} \mathrm{O}_{4}+4 \mathrm{H}_{2} \mathrm{O}_{2} \longrightarrow 2 \mathrm{CrO}_{5}+\mathrm{K}_{2} \mathrm{SO}_{4}+5 \mathrm{H}_{2} \mathrm{O}$
274401
When dil. $\mathrm{H}_{2} \mathrm{SO}_{4}$ is added to aqueous solution of Potassium chromate, yellow colour of solution turns to orange colour. It indicates........
1 Chromate ions are reduced.
2 Chromate ions are oxidized.
3 Mono centric complex is converted into dicentric complex.
4 Oxygen gets removed from chromate ions.
Explanation:
(C) : When dil. $\mathrm{H}_{2} \mathrm{SO}_{4}$ is added to the yellow solution of $\mathrm{K}_{2} \mathrm{CrO}_{4}$ yellow colour changes to orange red due to the formation of $\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}$ $2 \mathrm{~K}_{2} \mathrm{CrO}_{4}+\mathrm{H}_{2} \mathrm{SO}_{4} \rightarrow \mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}+\mathrm{K}_{2} \mathrm{SO}_{4}+\mathrm{H}_{2} \mathrm{O}$ The above reaction shows that the monocentric complex $\left(\mathrm{K}_{2} \mathrm{CrO}_{4}\right)$ is converted into dicentric $\left(\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}\right)$ complex.
GUJCET-2011
COORDINATION COMPOUNDS
274381
Which of the following complex ions absorbs the light of minimum wavelength?
(C) : Wavelength of light absorbed $\propto$ $\frac{1}{\text { Stability of complex }}$ In all given complexes $\mathrm{Co}$ is present in +3 state and among the given ligands $(\mathrm{CN})^{-}$is the strongest ligand. $\left[\mathrm{Co}(\mathrm{CN})_{6}\right]^{3-}$ is most stable, thus it absorbs light of minimum wavelength.
GUJCET-2017
COORDINATION COMPOUNDS
274384
The deep blue color produced on adding excess of ammonia to copper sulphate due to presence of
(B) : $\mathrm{CuSO}_{4}$ react with excess $\mathrm{NH}_{3}$ to form $\left[\mathrm{Cu}\left(\mathrm{NH}_{3}\right)_{4}\right](\mathrm{OH})_{2}$ with deep colour. $\mathrm{CuSO}_{4}+4 \mathrm{NH}_{3} \longrightarrow\left[\mathrm{Cu}\left(\mathrm{NH}_{3}\right)_{4}\right] \mathrm{SO}_{4}$ Blue complex due to $\left[\mathrm{Cu}\left(\mathrm{NH}_{3}\right)_{4}\right]^{2+}$
AIIMS-2016
COORDINATION COMPOUNDS
274389
When $\mathrm{H}_{2} \mathrm{O}_{2}$ is added to ice cold solution of acidified potassium dichromate in ether and the contents are shaken and allowed to stand
1 a blue colour is obtained in ether because of formation of $\mathrm{CrO}_{5}$
2 a blue colour is obtained in ether because of formation of $\mathrm{CrO}_{3}$
3 a blue colour is obtained in ether because of formation of $\mathrm{Cr}_{2}\left(\mathrm{SO}_{4}\right)_{3}$
4 chromyl chloride is formed
Explanation:
(A) : When $\mathrm{H}_{2} \mathrm{O}_{2}$ is added to acidified potassium dichromate in others solution potassium dichromate is oxidized to blue perioxide of chromium $\left(\mathrm{CrO}_{5}\right)$ which is soluble in ether and produces blue coloured solution. $\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}+\mathrm{H}_{2} \mathrm{~S}_{2} \mathrm{O}_{4}+4 \mathrm{H}_{2} \mathrm{O}_{2} \longrightarrow 2 \mathrm{CrO}_{5}+\mathrm{K}_{2} \mathrm{SO}_{4}+5 \mathrm{H}_{2} \mathrm{O}$
274401
When dil. $\mathrm{H}_{2} \mathrm{SO}_{4}$ is added to aqueous solution of Potassium chromate, yellow colour of solution turns to orange colour. It indicates........
1 Chromate ions are reduced.
2 Chromate ions are oxidized.
3 Mono centric complex is converted into dicentric complex.
4 Oxygen gets removed from chromate ions.
Explanation:
(C) : When dil. $\mathrm{H}_{2} \mathrm{SO}_{4}$ is added to the yellow solution of $\mathrm{K}_{2} \mathrm{CrO}_{4}$ yellow colour changes to orange red due to the formation of $\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}$ $2 \mathrm{~K}_{2} \mathrm{CrO}_{4}+\mathrm{H}_{2} \mathrm{SO}_{4} \rightarrow \mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}+\mathrm{K}_{2} \mathrm{SO}_{4}+\mathrm{H}_{2} \mathrm{O}$ The above reaction shows that the monocentric complex $\left(\mathrm{K}_{2} \mathrm{CrO}_{4}\right)$ is converted into dicentric $\left(\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}\right)$ complex.
GUJCET-2011
COORDINATION COMPOUNDS
274381
Which of the following complex ions absorbs the light of minimum wavelength?
(C) : Wavelength of light absorbed $\propto$ $\frac{1}{\text { Stability of complex }}$ In all given complexes $\mathrm{Co}$ is present in +3 state and among the given ligands $(\mathrm{CN})^{-}$is the strongest ligand. $\left[\mathrm{Co}(\mathrm{CN})_{6}\right]^{3-}$ is most stable, thus it absorbs light of minimum wavelength.
GUJCET-2017
COORDINATION COMPOUNDS
274384
The deep blue color produced on adding excess of ammonia to copper sulphate due to presence of
(B) : $\mathrm{CuSO}_{4}$ react with excess $\mathrm{NH}_{3}$ to form $\left[\mathrm{Cu}\left(\mathrm{NH}_{3}\right)_{4}\right](\mathrm{OH})_{2}$ with deep colour. $\mathrm{CuSO}_{4}+4 \mathrm{NH}_{3} \longrightarrow\left[\mathrm{Cu}\left(\mathrm{NH}_{3}\right)_{4}\right] \mathrm{SO}_{4}$ Blue complex due to $\left[\mathrm{Cu}\left(\mathrm{NH}_{3}\right)_{4}\right]^{2+}$
AIIMS-2016
COORDINATION COMPOUNDS
274389
When $\mathrm{H}_{2} \mathrm{O}_{2}$ is added to ice cold solution of acidified potassium dichromate in ether and the contents are shaken and allowed to stand
1 a blue colour is obtained in ether because of formation of $\mathrm{CrO}_{5}$
2 a blue colour is obtained in ether because of formation of $\mathrm{CrO}_{3}$
3 a blue colour is obtained in ether because of formation of $\mathrm{Cr}_{2}\left(\mathrm{SO}_{4}\right)_{3}$
4 chromyl chloride is formed
Explanation:
(A) : When $\mathrm{H}_{2} \mathrm{O}_{2}$ is added to acidified potassium dichromate in others solution potassium dichromate is oxidized to blue perioxide of chromium $\left(\mathrm{CrO}_{5}\right)$ which is soluble in ether and produces blue coloured solution. $\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}+\mathrm{H}_{2} \mathrm{~S}_{2} \mathrm{O}_{4}+4 \mathrm{H}_{2} \mathrm{O}_{2} \longrightarrow 2 \mathrm{CrO}_{5}+\mathrm{K}_{2} \mathrm{SO}_{4}+5 \mathrm{H}_{2} \mathrm{O}$
