ron (in Haber's Press and nickel (in invoke the formation of bonds between reactant molecules and atoms drogenation are some of the examples. Catalysts at a solid surface of the surface of the catalyst first row transition metals utilise 3d and 4s electrons for bonding. This has the effect of increasing the concentration of the reactants at the catahst surface and also weakening of the bonds in the reacting molecules (the activation energy is lowering Also because the transition metal ions can change their oxidation states they become more effective as catalysts. For example, iron(um catalyses the reaction between iodide and persulphate ions.
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Spherical mirrors have wide applications. So, if spherical mirrors were not known to human beings,
1) Their important role in hospitals, rear-view mirrors, would have been incomplete.
2) Use of concave mirrors in observing inner parts of mouth by denstists would not have been possible.
3) Use of convex mirrors in ATMs, computer monitors, sun glasses would not have been possible.
4) It would not have been possible to observe small objects as big if concave mirrors were not known.
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option C an atom of element of d an atom of compound
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