Edexcel 4 Welcome to your Edexcel 4 Which of the following statements about the oxidation state of transient elements is not correct? Compounds with high oxidation states are often reducing agents Relative stability of +2 state with respect to +3 state increases across the period Compounds with lower oxidation states tend to be reducing agents Vanadium has four main oxidation states Which of the following is used as a catalyst in the Haber process? Iron Vanadium(V)oxide Copper Silver Transition metals can act as homogeneous catalysts because they can form various... Oxidation states Compounds Isotopes Colours The Addition of concentrated HCl to aqueous ions of Cu lead to a change in coordination number from... 6-4 4-6 4-8 8-4 Adding all the individual orders of a reaction together gives us? The total order for a reaction The half order for a reaction The rate of full reaction The rate of half reaction The reaction rate increases 9 times by tripling the concentration of reactant A. What is the order of the reaction with respect to A? 2nd 1st Zero 3rd A reaction is first order with respect to reactant X and second order with respect to reactant Y. If the concentration of X is doubled and the concentration of Y is tripled, by what factor has the rate increased? 18 times 6 times 12 times 8 times What is the effect of increasing the temperature on rate constant k? It increases It decreases No effect Decreses to zero Which of the following is the the rate-determining step in mechanisims? Slowest step Fastest step First step Last step Which of the following causes the formation of a silver mirror when Tollens' reagent is added to it? Butanal Butanone Butanoic acid Butene What is the product when sodium tetrahydridoborate is added to propanone in aqueous ethanol? Propan-2-ol Propan-1-ol Propanoic acid Propanal What is the ratio of enantiomers in a racemic mixture? 50/50 25/75 30/70 60/40 Which of the following statements is true? Dextrorotatory rotates light clockwise Racemate rotates light anti-clockwise Chiral carbon is symmetrical Structural isomers are enantiomers What is the product when sodium tetrahydridoborate is added to propanone in an aqueous ethanol? Propan-2-ol Propan-1-ol Propanoic acid Propanal By what mechanism is benzene converted to nitrobenzene? Electrophilic substitution Nucleophilic substitution Electrophilic elimination Nucleophilic elimination What is the mechanism of Friedel-Crafts alkylation? Electrophilic substitution Nucleophilic substitution Nucleophilic addition Electrophilic addition Which of the following statements is incorrect? Polyesters have higher melting points than polyamides Polyethene is an addition polymer Kevlar is a polyamide Condensation polymers can be hydrolysed What is the product of the reaction between acylchloride and alcohol? Ester Carboxylic acid Acid anhydride Amides What is the product of the oxidation of aldehydes? Carboxylic acid Alcohol They cannot be oxidised Ketones How many peaks of C-13 NMR are there for 2-methylbutane? 4 3 2 5 HPLC (High performance liquid chromatography) is a type of? Column chromatography Gas-liquid chromatography Thin-layer chromatography Paper chromatography How many equivalent H atoms are there in 2-bromobutane with reference to H-NMR? 4 3 2 1 Gas-liquid chromatography can be used to separate mixtures of... Volatile liquids Volatile gases Non-flammable gases Non-flammable liquids Which of the following is true about tetramethylsilane?I. It is non-toxicII. It shows one peak on H-NMRIII. It has a low boining point I, II and III I and II only I and III only I only What is the state of the stationary phase in Thin-layer Chromatography? Solid Liquid Gas Either gas or liquid Time is Up!