Zadanie 21
Which species could be reduced to form SO2? A. S8 B. H2S C. SO32− D. SO42−
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Which species could be reduced to form SO2? A. S8 B. H2S C. SO32− D. SO42−
Which statement is correct for the cathode in both a voltaic cell and an electrolytic cell? A. It is the positive electrode B. It is the negative electrode C. Anions move towards it D. Reduction takes place at it
Which combination best describes what is happening to propene, CH3CH=CH2, in the equation below? CH3CH=CH2(g) + H2(g) → CH3CH2CH3(g) A. Oxidation and addition B. Oxidation and substitution C. Reduction and addition D. Reduction and substitution
The half-equation below is balanced using the lowest possible whole-number coefficients. a Cr2O72−(aq) + b H+(aq) + c e− → d Cr3+(aq) + f H2O(l) What is the value of c? A. 3 B. 6 C. 7 D. 14
A battery is connected in a circuit. The arrows show the direction of electron flow. What does terminal X of the battery represent? A. Anode and positive terminal B. Anode and negative terminal C. Cathode and positive terminal D. Cathode and negative terminal
Which functional groups are present in aspirin (acetylsalicylic acid)? A. Hydroxyl, ester and phenyl B. Carboxyl, ester and phenyl C. Carboxyl, amido and phenyl D. Carboxyl, alkoxy and hydroxyl
How many structural isomers of dichloropentane, C5H10Cl2, can be formed by the free-radical substitution of CH3CH2CH2CH2CH3 with excess Cl2 in the presence of UV light? Ignore stereoisomers. A. 5 B. 7 C. 9 D. 12
Which compounds are members of the same homologous series? A. Methanol, methanal, methanoic acid B. Ethane, ethene, ethyne C. Butan-1-ol, butan-2-ol, 2-methylpropan-2-ol D. Methanal, ethanal, propanal
Which structure represents a repeating unit of the polymer formed from chloroethene, CH2=CHCl? A. −CH2−CHCl− B. −CH2−CH2− C. −CHCl−CHCl− D. −CH2−CCl2−
Which procedure is best for converting butan-1-ol into butanoic acid? A. Heat under reflux with an acidified oxidizing agent B. Heat under reflux with a reducing agent C. Heat with an acidified oxidizing agent and distil off the product as it forms D. Heat…