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Mdcat-past-papers - ETEA Quiz

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621. Forward reaction is the one that:



622. For a first order reaction A → B, the rate constant is 0.0458 s⁻¹. Calculate rate of reaction if the concentration of reactant is 0.35 mol dm⁻³.



623. A reaction is first order with respect to A and second order with respect to B. The rate equation is:



624. The first ionization energy of Al is less than Mg. This is due to:



625. Which one of the following elements has the largest second ionization energy?



626. What is the reason for small atomic radii of sodium ions as compared to sodium atom?



627. Which of the following ions forms most stable complex compound?



628. All alkaline metals are white in colour except:



629. Which one has Prussian blue colour?



630. Brass is an alloy of:



631. Flame tests identify alkali metals when they are burnt. Which of the combinations given is the correct one?



632. H₂O has geometry:



633. The element chlorine is found in gaseous state while bromine is found in:



634. Which compound is formed when magnesium is reacted with 2 molecules of water?



635. Which pair of ions have five unpaired electrons?



636. Electronegativity of Al is approximately equal to:



637. Which of the following alkali metals forms only normal oxide with O₂?



638. Third period element that initially reacts rapidly with oxygen to form a protective oxide coating that prevents further reactions is:



639. Cu²⁺ salt solution is blue in color due to transition of electrons from:



640. Potassium ferrocyanide is which type of salt?



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