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#	Question	Subject and topic	Difficulty
81	What colour change is seen when acidified potassium dichromate acts as an oxidising agent?	Chemistry Oxides, oxoanions and important compounds	Easy
82	Which ore is the starting material for the manufacture of potassium dichromate?	Chemistry Oxides, oxoanions and important compounds	Easy
83	How many electrons are gained per permanganate ion when it acts as an oxidising agent in acidic solution?	Chemistry Oxides, oxoanions and important compounds	Medium
84	What happens when an acid is added to a yellow solution of potassium chromate?	Chemistry Oxides, oxoanions and important compounds	Medium
85	Why is hydrochloric acid not used to acidify KMnO₄ in redox titrations?	Chemistry Oxides, oxoanions and important compounds	Hard
86	What is the most common oxidation state of the lanthanoids?	Chemistry Lanthanoids and actinoids	Easy
87	What is the main cause of lanthanoid contraction?	Chemistry Lanthanoids and actinoids	Easy
88	Why do zirconium and hafnium have almost identical atomic radii?	Chemistry Lanthanoids and actinoids	Medium
89	Which lanthanoid ion is a good oxidising agent in aqueous solution?	Chemistry Lanthanoids and actinoids	Medium
90	Why do actinoids show a wider range of oxidation states than lanthanoids?	Chemistry Lanthanoids and actinoids	Hard
91	Which metal catalyst is used in the Haber process for ammonia?	Chemistry Applications of d- and f-block elements	Easy
92	Which compound is widely used in photographic films because it is sensitive to light?	Chemistry Applications of d- and f-block elements	Easy
93	Misch metal, used in lighter flints, mainly consists of:	Chemistry Applications of d- and f-block elements	Medium
94	Which catalyst combination is used to polymerise ethene in the Ziegler process?	Chemistry Applications of d- and f-block elements	Medium
95	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
96	What is the coordination number of the metal in [Co(en)₃]³⁺?	Chemistry Werner’s theory and key terms	Easy
97	What is the oxidation state of iron in K₄[Fe(CN)₆]?	Chemistry Werner’s theory and key terms	Easy
98	Which ligand is ambidentate?	Chemistry Werner’s theory and key terms	Medium
99	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
100	Which is a heteroleptic complex?	Chemistry Werner’s theory and key terms	Hard