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Kinetics Study on the Reaction between Iodide Ions and Hydrogen Peroxide
Kinetics Study on the Reaction between Iodide Ions and Hydrogen Peroxide
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1)
In which medium does the reaction between iodide ions and hydrogen peroxide takes place?
Highly alkaline
Neutral
Slightly alkaline
Acidic
2)
Which ion is formed when potassium iodide reacts with sodium thiosulphate, in an acidic medium, in the presence of hydrogen peroxide?
I⁻
H⁺
S₂O₃²⁻
SO₃⁻
3)
Which one of the following solutions is used as an indicator in the reaction between potassium iodide and sodium thiosulphate, in the presence of hydrogen peroxide?
Sulphuric acid
Starch solution
Methyl orange
Phenolphthalein
4)
What is observed when potassium iodide reacts with sodium thiosulphate, in an acidic medium, in the presence of hydrogen peroxide, using a starch indicator?
Appearance of turbidity
Appearance of yellow oily layer
Appearance of blue colour
No characteristic change
5)
Which one of the following complexes is responsible for the blue colour obtained in the reaction between potassium iodide and sodium thiosulphate, in the presence of hydrogen peroxide, using a starch indicator?
Starch – Sulphate complex
Starch – Iodine complex
Starch – Thiosulphate complex
Iodide – Thiosulphate complex
6)
How can we estimate the rate of the reaction between potassium iodide and sodium thiosulphate, in the presence of hydrogen peroxide, using a starch solution as indicator?
By measuring the time taken for the formation of iodide ions.
By measuring the time taken for the appearance of blue colour.
From the volume of distilled water.
From the volume of starch solution.
7)
In which reaction does the following composition give a blue coloration?
KI, Starch solution, Na₂S₂O₃, Hydrogen peroxide, Distilled water.
KI, H₂SO₄, Na₂S₂O₃, Starch solution, Hydrogen peroxide, Distilled water.
KI, H₂SO₄, Na₂S₂O₃, Starch solution.
KI, Starch solution, Na₂S₂O₃, Hydrogen peroxide.
8)
Which one of the following acids is used to make the medium acidic in the reaction between potassium iodide and sodium thiosulphate, in the presence of hydrogen peroxide?
Sulphuric acid
Oxalic acid
Lactic acid
Acetic acid
9)
What is the nature of the graph obtained by plotting Time for the appearance of blue colour Vs 1/volume of KI?
Hyperbola
Parabola
Straight line with zero slope
Straight sloping line
10)
Consider the reaction R→P. Which of the following expresses the rate of the reaction?
Rate = d[R]/dt
Rate = –d[P]/dt
Rate = d[P]/d[R]
Rate = +d[P]/dt