5. A color change reaction goes from red to clear as the reaction goes to comple

Question

5. A color change reaction goes from red to clear as the reaction goes to completion. If the reaction is observed to be very pale pink after 200 seconds, which of the following could be the total time for the reaction to complete? ?20 seconds O 1 minute 0 4 minutes 10 minutes 6. Select from the following list the time of reaction which would have the steepest slope on a graph of color change against time O 10 seconds O 30 seconds O 5 minutes 20 minutes 7. Which chemical was added to the iron solution (FeCl3) to change its color from pale yellow to deep red? O NaCl ? HCI O SnCl2 O KSCN 8. The coldest reaction in the lab had the shallowest slope on the graph of color against time O True o False Answers Graphs Units Precision Algebra Submit Powered b Smart Scienc

Explanation / Answer

5) 4 minutes.

reason= initially the reactant was red in colour it will slowly fade untill it turns clear .now at 200 sec the reaction turns very pale pink that means reaction is almost completed at 200 sec (3 min 20 sec) hence till 240 seconds it will turn completely clear.

6) 10 seconds

reason = the slope with maximum slope is called steepest slope. therfore 10 seconds will be the answer as change is x is least in this case.

7) KSCN

REASON= KSCN reacts with FeCl3 to form Fe(SCN)3 which is red in color.

8) False.

reason  = The slope of colour vs time graph depends on many other factors also temperature alone cannot decide the steepness and shallowness of the slope

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