Use the following information to answer the next question.

The food items that five blue-black colour with iodine are identified to be

I and II

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II and III

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III and IV

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IV and I

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Solution

The correct option is B
II and III

On addition of iodine, food items with carbohydrates turn blue-black in colour. Label II is potato and label III is cooked rice. Potato and cooked rice both contain starch. When iodine is added to them, they give a blue-black colour.

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Question 4

Read the food items given below.

(i) Wheat

(ii) Ghee

(iii) Iodised salt

(iv) Spinach

Which of the above food items are "energy giving foods"?

(a) (i) and (iv)

(b) (ii) and (iv)

(d) (iii) and (iv)

Use the following information to answer the next question.

Four pins (I, II, III, and IV) are fixed to a metallic rod with the help of wax. The rod is heated at one end.

Which of the following pins would drop first?

(i) Propane
(ii) Propene
(iii) Propyne
(iv) Chloropropane

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