The products of the electrolysis of dilute sodium chloride using carbon electrodes are
Anode Cathode
chlorine and sodium.
oxygen and hydrogen.
chlorine and hydrogen.
hydrogen and oxygen.
Correct answer is B
Oxygen is produced at the anode and hydrogen is produced at the cathode in dilute NaCl
MO
MO\(_{2}\)
MO\(_{3}\)
MO\(_{4}\)
Correct answer is C
Data obtained from the question
M = 60 g
O = 24 g
Empirical formula =?
How to determine the empirical formula
Divide by their molar mass
M = 60÷120 = 0.5
O = 24 ÷16 = 1.5
Divide by the smallest
M = 0.5÷0.5 = 1
O = 1.5 ÷0.5 = 3
Thus, the empirical formula of the oxide is MO₃
Which of the following statements about the standard hydrogen electrode is not correct?
The hydrogen gas is at a pressure of 1 atmosphere
A solution containing 1 mol dm-3 of H+ (aq) ions is used
A platinum electrode is used
The temperature is kept at 20 °C
Correct answer is D
The standard hydrogen electrode consists of hydrogen gas at 25oC
Alkanols can be manufactured from alkenes by the initial reaction of alkenes with
bromine in tetrachloromethane
concentrated tetraoxosulphate(VI) acid
aqueous potassium tetraoxomanganate(VII).
sodium hydroxide solution.
Correct answer is B
An alkene reacts with conc. H2SO4 to yield an alkyl hydrogen tetraoxosulphate (VI). The compound formed undergoes hydrolysis when boiled with water to yield an alcohol.
Which of the following compounds would react rapidly with bromine?
Benzene
Hexane
Hexene
Hexanol
Correct answer is C
The addition of bromine to most alkenes is so fast that when bromine is added dropwise to a solution of the alkene the red bromine color disappears almost immediately. In fact, this discharge of color is a useful qualitative test for alkenes.