A manufacturer accidentally dropped some industrial diamonds into copper (II) oxide powder. Which steps could be used to recover the diamonds from the mixture?

Step I: Shake with dilute sulphuric acid; Step II: Filter; Step III: Evaporate the filtrate to dryness

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Step I: Shake with dilute sulphuric acid; Step II: Filter; Step III: Save the residue and wash it with water

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Step I: Shale with water; Step I: Filter; Step III: Save the residue and wash it with water

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Step I: Shake with water; Step II: Filter; Step III: Evaporate the filtrate to dryness

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Solution

The correct option is B Step I: Shake with dilute sulphuric acid; Step II: Filter; Step III: Save the residue and wash it with water
Copper (ii) oxide is insoluble in water. When it is reacted with dilute sulphuric acid, it forms copper sulphate as the blue colour solution (soluble). The reaction can be written as follows,
$C u O (s) + H_{2} S O_{4} (d i l) \to C u S O_{4} (a q) + H_{2} O (l)$

Diamond remain insoluble on reaction with dilute sulphuric acid and it formed as residue. Then, the blue colour copper sulphate solution has to be filtered and the residue will then washed with water to recover diamonds from the mixture.
Thus, option - B is correct.

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Question 10

Two drops of dilute sulphuric acid were added to 1 g of copper sulphate powder and then small amount of hot water was added to dissolve it (step I). On cooling, beautiful blue coloured crystals got separated (step II). Step I and step II are:
(a) physical and chemical changes respectively
(b) chemical and physical changes respectively
(c) both physical change
(d) both chemical change

Given below are the steps to test the presence of proteins in a food item.

(i) Take a small quantity of the food item in a test tube, add 10 drops of water to it and shake it.

(ii) Make a paste or powder of food to be tested.

(iii) Add 10 drops of caustic soda solution to the test tube and shake well.

(iv) Add 2 drops of copper sulphate solution to it.

Which of the following is the correct sequence of steps?

(a) i, ii, iv, iii

(b) ii, i, iv, iii

(d) iv, ii, i, iii