Colour of Lanthanides

Q. Generally transition elements and their salts are colored due to the presence of unpaired electrons in metal ions. Which of the following compounds are colored?

1. $KMn{O}_4$
2. $Ce(S{O}_4{)}_2$
3. $TiC{l}_4$
4. $C{u}_{2}C{l}_2$

Q. Identify the correct pair of colorless species-

1. CoF₆^3- and NiCl₄^2-
2. TiF₆^2- and CoF₆^3-
3. TiF₆^2- and Cu₂Cl₂
4. Cu₂Cl₂ and NiCl₄^2-

Q.

CuS$O_4$.5$H_2$O is white in colour.

1. True

2. False

Q. The colour of light absorbed by an aqueous solution of $CuS{O}_4$ is:

1. orange-red
2. blue-green
3. yellow
4. violet

Q. The colour of light absorbed by an aqueous solution of $CuS{O}_4$ is:

1. orange-red
2. blue-green
3. yellow
4. violet

Q. Identify the correct pair of colorless species-

1. CoF₆^3- and NiCl₄^2-
2. TiF₆^2- and Cu₂Cl₂
3. TiF₆^2- and CoF₆^3-
4. Cu₂Cl₂ and NiCl₄^2-