Virtual Labs

1. 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?

a: From the volume of distilled water. Explanation

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b: From the volume of starch solution Explanation

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c: By measuring the time taken for the formation of iodide ions. Explanation

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d: By measuring the time taken for the appearance of blue colour. Explanation

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2.In which reaction does the following composition give a blue coloration? ?

a: KI, H₂SO₄, Na₂S₂O₃, Starch solution, Hydrogen peroxide, Distilled water Explanation

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b: KI, Starch solution, Na₂S₂O₃, Hydrogen peroxide, Distilled water Explanation

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c: KI, H₂SO₄, Na₂S₂O₃, Starch solution. Explanation

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d: KI, Starch solution, Na₂S₂O₃, Hydrogen peroxide. Explanation

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3. 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?

a: Lactic acid Explanation

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b: Sulphuric acid Explanation

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c: Oxalic acid Explanation

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d: Acetic acid Explanation

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4. What is the nature of the graph obtained by plotting Time for the appearance of blue colour Vs 1/volume of KI?

a: Straight line with zero slope. Explanation

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b: Straight sloping line. Explanation

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c: Hyperbola Explanation

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d: Parabola. Explanation

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5.Consider the reaction R→P. Which of the following expresses the rate of the reaction?

a: Rate = d[P]/dt Explanation

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b: Rate = d[R]/dt Explanation

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c: –d[P]/dt Explanation

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d: d[P]/d[R] Explanation

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