Pick out the correct statement(s).
1. Manganese exhibits +7 oxidation state
2. Zinc forms coloured ions
3. [CoF6]3- is diamagnetic
4. Sc forms +4 oxidation state
5. Zn exhibits only +2 oxidation state
1 and 2
1 and 5
2 and 4
3 and 4
B.
1 and 5
1.Electronic configuration of Mn is 3d5, 4s2 and hence, it exhibits + 7 oxidation state.
2. Zinc does not form coloured ions as it has completely filled 3d10, 4s2 configuration.
3. In [CoF6]3- fluoride is a weak field ligand and hence, does not cause pairing of electrons in d7 system of Co3+. Thus, the complex is paramagnetic.
Electronic configuration of Co3+ is
4. Sc has outer configuration of 3d1 4s2 , hence it can form a maximum of + 3 oxidation state.
5. Zn exhibits only+ 2 oxidation state as in this it is the most stable.
he amount of solute (molar mass 60 g mol-1) that must be added to 180 g of water so that the vapour pressure· of water is lowered by 10%, is
30g
60g
120g
12g
Which of the following species can function both as oxidising as well as reducing agent?
Cl-
ClO-
One Faraday of electricity is passed through molten Al2O3 , aqueous solution of CuSO4 and molten NaCl taken in three different electrolytic cells connected in series. The mole ratio of Al, Cu and Na deposited at the respective cathode is
2: 3: 6
2: 3: 6
6 : 3 : 2
1 : 2: 3
Half-lives of a first order and a zero order reactions are same. Then, the ratio of the initial rates of first order reaction to that of the zero order reaction is
1/0.693
2 ×0.693
0.693
6.93
The dispersed phase and dispersion medium in soap lather are respectively
gas and liquid
liquid and gas
solid and gas
solid and liquid
In petrochemical industry, alcohols are directly converted to gasoline by passing over heated
platinum
ZSM-S
iron
nickel
Which among the following statements are true for the complex [Co(NH3)6][Cr(CN)6]?
1. It is a non-electrolyte
2. The magnitude of the charge on each complex ion is 3
3. The complex will not conduct current
4. The complex will exhibit coordination isomerism
5. The magnitude of the charge on each complex ion is 1
2 and 4
1 and 4
3 and 5
1 and 2