A potato tuber has been cut into two halves. A few drops of iodine solution are placed on the cut surface of one of the halves. What colour change will be noticed?

A From brown to blue-black
B From brown to orange-red
C From blue to pink
D From pink to blue-green

Correct Answer: From brown to blue-black

The Iodine test is used to test for the presence of starch. Iodine solution — iodine dissolved in an aqueous solution of potassium iodide — reacts with the starch producing a purple black colour.
Bissoy MCQ
#General Knowledge #Chemistry

Related Questions

How many liters of a 40% iodine solution need to be mixed with 35 liters of a 20% iodine solution to create a 35% iodine solution?
A 105
B 49
C 100
D 140
How many liters of a 40% iodine solution need to be mixed with 35 liters of a 20% iodine solution to create a 35 % iodine solution ?
A 105
B 49
C 100
D 140
How many liters of a 60% iodine solution need to be mixed with 30 liters of a 30% iodine solution to create a 50% iodine solution?
A 60
B 75
C 100
D 105
A coil is cut into two halves, the stiffness of cut coil will be
A Double
B Half
C Same
D None of these
Iodine can be separated from a mixture of Iodine and Potassium Chloride by
A Sedimentation
B Filtration
C Sublimation
D Distillation
Aruna cut a cake into two halves and cuts one half into smaller pieces of equal size. Each of the small pieces is twenty grams in weight. If she has seven pieces of the cake in all with her, how heavy was the original cake ?
A 120 grams
B 140 grams
C 240 grams
D 280 grams
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100 kg of solution A is mixed with 60 kg of solution B . If solution A has tin and copper in the ratio 1: 4 and solution B has lead and tin in the ratio 3 :2 then what is the amount of tin in the new solution?
A 70 kg
B 36 kg
C 44 kg
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A solid sphere of diameter 17.5 cm is cut into two equal halves. What will be the increase (in cm2) in the total surface area?
A 289
B 361.5
C 481.25
D 962.5
Solution X contains 7% (by weight) of liquid M and solution Y contains 14.5% (by weight) of liquid M. If 3 grams of solution X is mixed with 2 grams of solution Y, then liquid M accounts for what percent of the weight of the resulting solution?
A 6.09%
B 10%
C 10.75%
D 21.5%
Solution X is 10% percent alcohol by volume, and solution Y is 30 percent alcohol by volume. How many milliliters of solution Y must be added to 200 milliliters of solution X to create a solution that is 25 percent alcohol by volume?
A 600
B 800
C 300
D 250
E None of these

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