| 2081 |
What is the main cause of lanthanoid contraction? |
Chemistry
Lanthanoids and actinoids |
Easy |
| 2082 |
Why do zirconium and hafnium have almost identical atomic radii? |
Chemistry
Lanthanoids and actinoids |
Medium |
| 2083 |
Which lanthanoid ion is a good oxidising agent in aqueous solution? |
Chemistry
Lanthanoids and actinoids |
Medium |
| 2084 |
Why do actinoids show a wider range of oxidation states than lanthanoids? |
Chemistry
Lanthanoids and actinoids |
Hard |
| 2085 |
Which metal catalyst is used in the Haber process for ammonia? |
Chemistry
Applications of d- and f-block elements |
Easy |
| 2086 |
Which compound is widely used in photographic films because it is sensitive to light? |
Chemistry
Applications of d- and f-block elements |
Easy |
| 2087 |
Misch metal, used in lighter flints, mainly consists of: |
Chemistry
Applications of d- and f-block elements |
Medium |
| 2088 |
Which catalyst combination is used to polymerise ethene in the Ziegler process? |
Chemistry
Applications of d- and f-block elements |
Medium |
| 2089 |
A factory converts vegetable oils into solid fats by hydrogenation. Which catalyst is most likely used? |
Chemistry
Applications of d- and f-block elements |
Hard |
| 2090 |
What is the coordination number of the metal in [Co(en)₃]³⁺? |
Chemistry
Werner’s theory and key terms |
Easy |
| 2091 |
What is the oxidation state of iron in K₄[Fe(CN)₆]? |
Chemistry
Werner’s theory and key terms |
Easy |
| 2092 |
Which ligand is ambidentate? |
Chemistry
Werner’s theory and key terms |
Medium |
| 2093 |
One mole of CoCl₃·5NH₃ is treated with excess AgNO₃ solution. How many moles of AgCl are precipitated? |
Chemistry
Werner’s theory and key terms |
Medium |
| 2094 |
Which is a heteroleptic complex? |
Chemistry
Werner’s theory and key terms |
Hard |
| 2095 |
What is the IUPAC name of [Co(NH₃)₆]Cl₃? |
Chemistry
IUPAC nomenclature |
Easy |
| 2096 |
Which ending is used for the name of the metal when the complex is an anion? |
Chemistry
IUPAC nomenclature |
Easy |
| 2097 |
What is the IUPAC name of K₃[Fe(CN)₆]? |
Chemistry
IUPAC nomenclature |
Medium |
| 2098 |
What is the correct formula for tetraamminediaquacobalt(III) chloride? |
Chemistry
IUPAC nomenclature |
Medium |
| 2099 |
What is the IUPAC name of [CoCl₂(en)₂]Cl? |
Chemistry
IUPAC nomenclature |
Hard |
| 2100 |
Which type of isomerism is shown by [Co(NH₃)₅(NO₂)]Cl₂ and [Co(NH₃)₅(ONO)]Cl₂? |
Chemistry
Isomerism |
Easy |