Zadanie 34
Which half-equation represents the reduction of sulfuric acid to sulfur dioxide in acidic solution? A. H2SO4 + 2 H+ + 2 e− → SO2 + 2 H2O B. H2SO4 + 4 H+ + 4 e− → SO2 + 2 H2O C. H2SO4 + 2 H2O → SO2 + 6 H+ + 2 e− D.…
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Which half-equation represents the reduction of sulfuric acid to sulfur dioxide in acidic solution? A. H2SO4 + 2 H+ + 2 e− → SO2 + 2 H2O B. H2SO4 + 4 H+ + 4 e− → SO2 + 2 H2O C. H2SO4 + 2 H2O → SO2 + 6 H+ + 2 e− D.…
Which statement correctly describes a type of electrochemical cell? A. A secondary cell operates as a voltaic cell when discharging and as an electrolytic cell when it is recharged B. A primary (voltaic) cell converts electrical energy into chemical energy C.…
Which compounds are oxidized when heated with acidified potassium dichromate(VI) solution? I. CH3CH2C(CH3)2OH II. (CH3)2CHCH2OH III. CH3CH(OH)CH3 A. I and II only B. I and III only C. II and III only D. I, II and III
A voltaic cell is made by connecting a manganese half-cell (Mn(s) in Mn2+(aq)) and a tin half-cell (Sn(s) in Sn2+(aq)) under standard conditions. Mn2+(aq) + 2 e− ⇌ Mn(s) E⊖ = −1.18 V…
A student placed strips of the metals L, M and N in aqueous solutions containing the ions M2+, N2+ and L2+ respectively, as shown. The observations are given under each beaker. What is the order of increasing reactivity of the three…
Which of the following is a correct description of the standard hydrogen electrode (SHE)? A. Hydrogen gas at 100 kPa is bubbled through a 1.0 mol dm−3 solution of sodium hydroxide B. Its electrode potential of 0.00 V is assigned by convention,…
Which radical is most likely to form when one covalent bond in bromochlorodifluoromethane, CBrClF2, is broken by ultraviolet light in the upper atmosphere? A. •CBrF2 B. •CClF2 C. •CBrClF D. •CBrClF2
A concentrated aqueous solution of potassium bromide is electrolysed between inert electrodes. Which products are mainly formed at the anode and at the cathode? A. Anode: O2, cathode: H2 B. Anode: O2, cathode: K C. Anode:…
Pent-2-ene undergoes a range of addition reactions. Which reagent and product are correctly matched? A. Reagent H2, product pent-1-ene B. Reagent Br2, product 2,3-dibromopentane C. Reagent H2O, product pentan-1-ol D. Reagent HBr,…
Which compound is formed when pentan-2-one, CH3COCH2CH2CH3, is reduced? A. CH3CH2CH2CH2CH2OH B. CH3CH2CH2CH2COOH C. CH3CH2CH2CH2CHO D. CH3CH(OH)CH2CH2CH3