Which of the following is not a characteristic of transition elements?
Variable oxidation states
Formation of coloured compounds
Formation of interstitial compounds
Natural radioactivity
D.
Natural radioactivity
Natural radioactivity is not a characteristic of transition elements.
General properties of transition elements are
(i) Formation of coloured salts
(ii) Formation of complex salts
(iii) Magnetic properties
(iv) Formation of interstitial compounds
(v) Formation of alloys etc.
The IUPAC name of the given compound [Co(NH3)5Cl]Cl2 is
penta amino cobalt chloride chlorate
cobalt penta ammine chloro chloride
pentamine chloro cobalt (III) chloride
penta amino cobalt (III) chlorate
When SCN- is added to an aqueous solution containing Fe(NO3)3, the complex ion produced is
[Fe(OH2)2(SCN)]2+
[Fe(OH2)5(SCN)]2+
[Fe(OH2)8(SCN)]2+
[Fe(OH2)(SCN)]6+
Schottky defects occurs mainly in electrovalent compounds where
positive ions and negative ions are of different size
positive ions and negative ions are of same size
positive ions are small and negative ions are big
positive ions are big and negative ions are small
The number of unpaired electrons calculated in [Co(NH3)6]3+ and [CoF6]3- are
4 and 4
0 and 2
2 and 4
0 and 4
If a plot of log10 C versus t gives a straight line for a given reaction, then the reaction is
zero order
first order
second order
third order
The half-life period of a first order reaction is 1 min 40 s. Calculate its rate constant.
6.93
6.93
6.93