برقی کیمیا

Written by Dr. Ayesha Nadeem (Chemistry)

نویں جماعت · کیمیا · 10 سوالات

نام: ____________________ تاریخ: ____________

The process of splitting a compound by passing electric current through it is called:
- A Filtration
- B Combustion
- C Electrolysis
- D Distillation
In electrolysis, the electrode connected to the negative terminal of the battery is the:
- A Salt bridge
- B Anode
- C Cathode
- D Electrolyte
Oxidation is the:
- A Loss of neutrons
- B Gain of electrons
- C Loss of electrons
- D Gain of protons
What is collected at the cathode when molten sodium chloride is electrolysed?
- A Hydrogen
- B Sodium
- C Chlorine
- D Oxygen
Electroplating is used to:
- A Cool a metal
- B Make water pure
- C Make alloys
- D Coat one metal with a thin layer of another
The oxidation number of oxygen in most compounds is:
- A -2
- B +1
- C +2
- D 0
In the electrolysis of water, the gas collected at the cathode is:
- A Oxygen
- B Chlorine
- C Nitrogen
- D Hydrogen
A substance that conducts electricity when molten or dissolved is an:
- A Catalyst
- B Non electrolyte
- C Insulator
- D Electrolyte
Which is a non electrolyte?
- A Salt solution
- B Sugar solution
- C Dilute acid
- D Molten salt
Anode is the electrode where ___ occurs.
- A Evaporation
- B Oxidation
- C Reduction
- D Neutralisation

جوابی کلید

1. C, 2. C, 3. C, 4. B, 5. D, 6. A, 7. D, 8. D, 9. B, 10. B

This is electrolysis.
The cathode is the negative electrode and attracts positive ions.
Oxidation means loss of electrons (OIL RIG).
Sodium ions gain electrons at the cathode to form sodium metal.
In electroplating a metal is coated by electrolysis, for example chromium or silver plating.
Oxygen is usually -2 in compounds.
Hydrogen forms at the negative electrode.
Electrolytes contain free ions.
Sugar does not form ions in water.
Oxidation occurs at the anode.