d- and f-Block Elements · Question 9

Pairs of elements with the same number of electrons in their respective 4f orbital are [Atomic number. Eu-63, Gd-64, Dy-66, Ho-67, Tm-69, Yb-70, Lu-71, Hf-72] Choose the correct answer from the options given below :

1. B and C Only
2. A and B Only
3. A and D Only
4. A and C Only

Consider |x| is the difference in oxidation states of Mn in highest manganese fluoride and highest manganese oxide. The ions with |x| number of unpaired electrons from the following are : Choose the correct answer from the options given below :

1. A and B Only
2. C, D and E Only
3. C and E Only
4. B and E Only

Which of the following sets includes all the species that will change the orange colour of K2Cr2O7 in acidic medium ?

1. Fe2+, Sn2+, I-, S2-
2. S2-, Fe3+, I-, C2O42-
3. Fe2+, NO2-, SO2, Sn4+
4. Fe3+, SO42-, S2-, Sn4+

Given below are two statements : In the light of the above statements, choose the correct answer from the options given below :

1. Both Statement I and Statement II are true
2. Both Statement I and Statement II are false
3. Statement I is true but Statement II is false
4. Statement I is false but Statement II is true

Among Fe2+, Fe3+, Cr2+ and Zn2+, the ion that shows positive borax bead test and with highest ionisation enthalpy is :

1. Fe2+
2. Zn2+
3. Cr2+
4. Fe3+

Number of paramagnetic ions among the following d- and f-block metal ions is . Mn2+, Cu2+, Zn2+, Yb2+, Sc3+, La3+, Gd3+, Lu3+, Ti4+, Ce4+ (Atomic number of Mn = 25, Cu = 29, Zn = 30, Yb = 70, Sc = 21, La = 57, Gd = 64, Lu = 71, Ti = 22, Ce = 58)

Given below are two statements : In the light of the above statements, choose the correct answer from the options given below

1. Statement I is false but Statement II is true
2. Both Statement I and Statement II are false
3. Both Statement I and Statement II are true
4. Statement I is true but Statement II is false

Consider the following statements about manganate and permanganate ions. Identify the correct statements. Choose the correct answer from the options given below :

1. A and D Only
2. A, B and C Only
3. A, C and D Only
4. A, D and E Only

"X" is an oxoanion of the lightest element of group 7 (in the periodic table). The metal is in +6 oxidation state in "X". The color of the potassium salt of X is

1. purple
2. orange
3. yellow
4. green

The oxidation state of chromium in the final product formed in the reaction between KI and acidified K2Cr2O7 solution is :

1. +2
2. +3
3. +4
4. +6