Practice free Chemistry NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
Which of the following is NOT a characteristic of interstitial compounds mentioned in the provided text?
The text explicitly states: 'They are usually non stoichiometric and are neither typically ionic nor covalent.' Therefore, exhibiting typically ionic bonding is not a characteristic.
Consider the catalytic reaction between iodide and persulphate ions: $2 I^- + S_2O_8^{2-} \to I_2 + 2 SO_4^{2-}$. Which transition metal ion acts as a catalyst in this reaction, and how does its oxidation state change during the process?
The context provides the example: 'For example, iron(III) catalyses the reaction between iodide and persulphate ions. $2 Fe^{3+} + 2 I^- \to 2 Fe^{2+} + I_2$ and $2 Fe^{2+} + S_2O_8^{2-} \to 2 Fe^{3+} + 2SO_4^{2-}$'. This clearly shows iron changing from +3 to +2 and then back to +3.
The Ziegler catalysts, used for manufacturing polyethylene, are based on $TiCl_4$ and which other compound?
The text states: '$TiCl_4$ with $Al(CH_3)_3$ forms the basis of the Ziegler catalysts used to manufacture polyethylene (polythene).'
Which transition metal catalyst is typically used for the hydrogenation of fats?
The text mentions: 'Nickel catalysts enable the hydrogenation of fats to proceed.'
In the Wacker process, the oxidation of ethyne to ethanal is catalyzed by:
The context explicitly states: 'In the Wacker process the oxidation of ethyne to ethanal is catalysed by $PdCl_2$.'
Why are d-orbitals of transition elements more influential in catalytic activity compared to s and p orbitals?
The context explains: 'The d orbitals of the transition elements protrude to the periphery of an atom more than the other orbitals (i.e., s and p), hence, they are more influenced by the surroundings as well as affect the atoms or molecules surrounding them.'
Which of the following compounds is an example of an interstitial compound?
The context provides examples of interstitial compounds: 'for example, TiC, Mn4N, Fe3H, VH0.56 and TiH1.7, etc.'
Transition metal ions become effective catalysts due to their ability to:
The text states: 'Also because the transition metal ions can change their oxidation states, they become more effective as catalysts.'
For first-row transition metals acting as solid surface catalysts, which electrons are primarily utilized for bonding with reactant molecules?
The context specifies: 'Catalysts at a solid surface involve the formation of bonds between reactant molecules and atoms of the surface of the catalyst (first row transition metals utilise 3d and 4s electrons for bonding).'
Interstitial compounds are characterized by which of the following features?
The context states: 'They are usually non stoichiometric and are neither typically ionic nor covalent... They have high melting points, higher than those of pure metals.' The core definition also specifies small atoms trapped, not large ones.
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The bank mixes NEET previous year questions (PYQs) with practice questions, each tagged with its exam appearances where applicable.