EASY
Earn 100

In an electrochemical cell, the negative terminal of the battery is connected to-

50% studentsanswered this correctly

Important Questions on Electrolysis and Chemical Reaction

EASY

Consider the metals and solutions given in the box.

Zn, Mg, Cu, Ag, CuSO4 Solution, MgSO4 Solution

(a) Which of the above metals have to be selected to construct a Galvanic Cell? 
(b)Identify the anode and cathode of the cell. 

[Reactivity order Mg > Zn > Cu > Ag]

(c) Write the redox reaction taking place in the cell. 

HARD

An aqueous solution of nickel (II) sulphate was electrolyzed using nickel electrodes. Observe the diagram and answer the question that follows:

Question Image  

  • Which equation for the reaction at the anode is correct?
EASY
During electrolysis, which electrode is called as cathode?
EASY
An electrolytic cell consists of
(i) positively charged cathode
(ii) negatively charged anode
(iii) positively charged anode
(iv) negatively charged cathode
MEDIUM
The detection of alcohol in drunken drivers is possible through the electrochemical _____ reaction of ethanol. 
MEDIUM
Biochemistry is a branch of chemistry that deals with the relation between electrical energy and chemical change.
MEDIUM
During extraction of metals from their ores using the chemical effects of electric current, metal is always produced at the _____. (anode/ cathode)
EASY
In the galvanic cell, which process occurs at the positive terminal, and what is it called?
EASY
An electrolytic cell consists of
(a) Positively charged cathode
(b) Negatively charged anode
(c) Positively charged anode
(d) Negatively charged cathode
EASY
An electrolytic cell consists of
(i) positively charged cathode
(ii) negatively charged anode
(iii) positively charged anode
(iv) negatively charged cathode
MEDIUM
Production of metals like aluminium and titanium from their ores involves electrochemical reactions.
MEDIUM
Match the following columns:
  Column I   Column II
(i) Electrode connected to positive terminal of battery. (a) Cathode
(ii) Electrode connected to negative terminal of battery. (b) Anode
(iii) Substance which undergoes decomposition in aqueous solution, when current is passed (c) Non–electrolyte
(iv) Substance which does not allow electric current to pass through it neither in aqueous not in molten state. (d) Electrolyte
MEDIUM
List out the instruments that use electrochemical cells. What are the merits and demerits of using such cells? 
HARD
Batteries that are used in the mobile phone can be recharged. Likewise, can you recharge the batteries used in watches? Justify your answer.
HARD
Cell Instrument in which it is used
Dry cell Radios
Cameras
Clocks
Toys
Mercury cell Watches
Calculator
Electronic instruments
Nickel- cadmium cell Rechargeable torches 
Cameras
Lithium ion cell Mobile phone
Laptops
  • What do we do with these types of cells after their use?
  • Which among these cells can be recharged and reused? 
  • Do they cause environmental pollution?