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Class 8 Practice – Level 3 – Set 2 – Chemical Effects of Electric Current
Total questions: 15
1.
When an acid is mixed with a base, what is the resulting solution typically called?
Saltwater
Neutral solution
Hydrochloric acid
Ionized solution
None
2.
What is the main disadvantage of electroplating with low-quality materials?
Faster deposition rates
Greater environmental impact
Inferior finish and adhesion of the coating
Higher costs
None
3.
Why is electrolysis used in the extraction of aluminum from its ore?
It is a low-energy process
It effectively separates aluminum from oxygen
It produces aluminum salts
It eliminates the need for refining
None
4.
What indicates that a chemical reaction has taken place during electrolysis?
Color change in the solution
Change in temperature
Formation of gas bubbles
All of the above
None
5.
What happens to the conductivity of a solution as more ionic solute is added?
It decreases
It remains the same
It increases
It becomes neutral
None
6.
What would likely happen if a non-conducting solution is tested with an LED?
The LED would light up brightly
The LED would flicker
The LED would not light up
The LED would burn out
None
7.
Which of the following acids is commonly used in electrolysis?
Hydrochloric acid
Acetic acid
Citric acid
Phosphoric acid
None
8.
How does the purity of the electrolyte affect the quality of the electroplated coating?
Higher purity leads to a rough surface
Lower purity results in a smoother finish
Higher purity yields a smoother and more uniform coating
Purity has no effect on the coating
None
9.
In the electrolysis of a copper sulfate solution, which ion is discharged at the cathode?
Cu²⁺ ions
SO₄²⁻ ions
H⁺ ions
O²⁻ ions
None
10.
What type of chemical reaction occurs during the electrolysis of a compound?
Synthesis reaction
Decomposition reaction
Single replacement reaction
Double replacement reaction
None
11.
If a solution contains both strong and weak electrolytes, which will dominate the conductivity?
The weak electrolyte
The strong electrolyte
The solution will be non-conductive
Conductivity will depend on temperature
None
12.
What happens when an LED is connected to a highly conductive solution?
It may dim due to high current
It lights up steadily and brightly
It will not light up
It flickers
None
13.
Which of the following statements is true regarding the conductivity of salts in water?
All salts dissolve equally well
Salts that dissociate into more ions conduct better
Salts do not conduct electricity in solution
Only soluble salts can conduct electricity
None
14.
What is the environmental concern associated with electroplating processes?
High energy consumption
Waste generation containing toxic metals
Water consumption
High labor costs
None
15.
Why is electrolysis considered an endothermic process in some cases?
It requires energy input to drive the reactions
It produces heat as a byproduct
It releases gases
It generates light
None
1 out of 15
Time's up
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