Platinum, Palladium and Iridium are called noble metals because
- AAlfred Nobel discovered them
- BThey are shining lustrous and pleasing to look at
- CThey are found in native state
- DThey are inert towards many common reagents.
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Which of the following elements in their respective oxidation states develops the highest spin-only magnetic moment?
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The element with atomic number $23$ is placed in the periodic table in:
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