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Q.
Aluminium exists in stable state whereas thallium exists in both & oxidation state. The reason for this is
Inert pair effect
Lanthanoid contraction
Diagonal relationship
None of these
Q. Which of the following is a colorless complex ion?
- [Cu(NH3)4]2+
- [Cr(H2O)6]3+
- [FeF6]3−
- [Mn(H2O)6]3+
Q. The oxidation state of the Ti in [Ti(CO)6]2− is:
- +4
- +2
- -2
- 0
Q. Which of the following ions is coloured in solution?
Cu+
Zn2+
Ti4+
V3+
Q. How many among the following ions are expected to be coloured? Cu+, Fe2+, Mn2+, Cr3+, Sc3+, Ti4+
- 1
- 4
- 3
- 2
Q. Aluminium is usually found in its +3 oxidation state . In contrast, thallium exists in both +1 (more stable) and +3 (less stable) oxidation states. This is due to:
- lanthanoid contraction
- lattice effect
- diagonal relationship
- inert pair effect
Q. Which of the following set has all coloured ions
- Cu+, Cu2+, Ni2+
- Cu2+, Co2+, Sc2+
- Cu2+, Fe2+, Co2+
- Na+, Mg2+, Al3+
Q.
The magnetic moment of 'autocatalyst' formed in the reaction between acidified oxalic acid and potassium permanganate is
5.9 BM
4.9 BM
3.9 BM
2.8 BM
Q. Which ion gives coloured solution?
- Zn2+
- Ti4+
- Cu
- V3+
Q. Which of the following is colourless?
- [Cu(H2O)4]2+
- [Cu(CN)2]−
- Cu(NH3)4]2+
- [CuCl4]2−
Q. Metals form coloured salts are
- all metals
- non-metals
- p-block elements
- Transition metals
Q. The colour of Cu2+2
- White
- Blue
- Orange
- Yellow
Q. The aqueous solution containing which one of the following ions will be colourless
- Sc+3
- Fe+2
- Ti+3
- Mn+2
Q. How many among the following ions are expected to be coloured? Cu+, Fe2+, Mn2+, Cr3+, Sc3+, Ti4+
- 1
- 4
- 3
- 2
Q. Which of following statements is not true regarding an alkali metal in a solution of NH3?
- Blue colouration happens due to ammoniated electrons
- Blue colour changes to bronze, on dilution due to the formation of metal clusters
- Increasing the concentration of the alkali metal makes the solution less paramagnetic due to electron-electron pairing
- On heating, blue colour disappears due to formation of a metal amide and H2 gas
Q. Which of the following pairs has almost same colour?
- 60Nd3+, 69Tm3+
- 70Yb3+, 59Pr3+
- 63Eu3+, 67Tb3+
- 64Gd3+, 67Ho3+
Q. The colour of Cu2+2
- White
- Blue
- Orange
- Yellow
Q. The oxidation state of the Os metal atom in Os(CO)5 is:
- +5
- +1
- -1
- 0
Q. Iron has the lowest oxidation state in
- K4[Fe(CN)6]
- Fe2O3
- [Fe(CO)5]
- [Fe(C2O4)3]3−
Q. Which of the following compounds will be coloured in solid state?
- Cu2Cl2
- ZnF2
- CuF2
- Ag2SO4
Q. Transition elements are coloured due to
- Small size
- Metallic nature
- unpaired d – e−
- All
Q. Of the following outer electronic configurations of atoms, the highest oxidation state is achieved by which one of them
- (n−1)d3 ns2
- (n−1)d5 ns1
- (n−1)d8 ns2
- (n−1)d5 ns2
Q. Which of the following compounds is expected to be coloured? (Atomic numbers are given as: [Ag=47, Cu=29, Mg=12])
- Ag2SO4
- CuF2
- MgF2
- CuCl
Q. What should be the colour of the compound which has vanadium in +4 oxidation state?
- Blue
- Yellow
- Red
- Green
Q. Which of the following pairs has almost same colour?
- 60Nd3+, 69Tm3+
- 70Yb3+, 59Pr3+
- 63Eu3+, 67Tb3+
- 64Gd3+, 67Ho3+