Which of the following is true about an electrolyte?
I Electrolyte conducts electricity in molten state.
II Electrolyte conducts electricity in solid state.
III Electrolyte is soluble in water.
IV Electrolyte undergoes chemical decomposition when it conducts electricity.
Which of the following is not an electrolyte?
Naphthalene does not conduct electricity because it
Which of the following is most probably substance X?
What are the ions present in molten lead (II) bromide?
Which of the following happens during the electrolysis of molten sodium bromide?
I Sodium ions are attracted to the cathode.
II Bromide ions are attracted to the anode.
III Electrons are moving from anode to cathode.
IV At the cathode, bromine ions accept electron from anode.
What is formed at carbon electrode Q?
The electrolysis of aqueous sodium nitrate using carbon electrode was carried out in a lab. Which of the following is true about this experiment?
What need to be changed in order to get different gas from this experiment?
Which of the following are the factors that determine the type of ions to be discharged at the electrodes?
I Type of electrode used.
II Concentration of ions in the solution.
III The molecular mass of the atom used.
IV Position of ions in electrochemical series.
Diagram 4 shows the set-up of the apparatus used to electroplate an iron key with silver. What is the observation after 30 minutes?
I At anode, silver foil become thinner.
II At anode, shinny grey deposits are formed.
III At cathode, gas bubbles are released.
IV At cathode, shinny grey deposits are formed.
Which of the following is true about electroplating an iron key with copper?
Which of the following is true about the voltaic cell?
I The copper plate dissolves gradually.
II The zinc plate acts as negative terminal.
III The zinc plate become thinner.
IV Electrons flow from zinc plate to copper plate.
Which of the following changes can increase the reading on the voltmeter?
What is the correct chemical reaction that takes place in the positive terminal of the chemical cell?
Which of the following pairs can produce the highest reading on the voltmeter?
Jenny wants to make her ring more beautiful and prevent corrosion. What is the best way to achieve this?
Table 1 shows the information about three simple cells.
What is the potential difference of the metal pair Q and S?
Table 2 shows the information of two simple cells.
Which of the following is the ascending order of electrode X, Y and Z in the electrochemical series?
Which of the following is not the example of electrochemical industries in our daily life?