MCQ
Elements which generally exhibit variable oxidation states and form colored ions are ___________.
- AMetalloids.
- BTransition elements.
- CNon-metals.
- DGases.
✓
Answer
- Transition elements.
Explanation:
Transition elements have vacant d orbitals and the energy gap between d orbitals is very less. So transition elements exhibit variable oxidation state and form coloured ions as these elements emit radiations due to excitation of d electrons.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
Which of the following compound will not give Iodoform Test
In Cannizzaro reaction given below
→$2PhCHO \xrightarrow{{:\mathop O\limits^ \ominus H}}PhC{H_2}OH + PhC\mathop {O_2^ \ominus }\limits^{.\,\,.\,\,} $
the slowest step is :
A compound with molecular mass $180$ is acylated with $CH_3COCl$ to get a compound with molecular mass $390.$ The number of amino groups present per molecule of the former compound is :
→The radius of La3+ (atomic number of La = 57) is 1.06A. Which one of the following given values will be closest to the radius of Lu3+? (atomic number of Lu = 71)
Acetaldehyde and acetone can be distinguished by
For a chemical reaction temperature increased from $25\,^oC$ to $55\,^oC$ then rate of reaction will be changed by a factor of (Assume $\mu = 3$ )
→Reagent $(x)$ can be
→Which of the following is correct
A student has studied the decomposition of a gas $AB _3$ at $25^{\circ} C$. He obtained the following data.
→| $p ( mm Hg )$ | $50$ | $100$ | $200$ | $400$ |
| Relative $t _{1 / 2}( s )$ | $4$ | $2$ | $1$ | $0.5$ |
The order of the reaction is
Consider the above reaction, the major product $"P"$ formed is:
→