Water turns anhydrous copper sulphate solution in the carbon-hydrogen detection experiment :

brown

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red

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blue

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green

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Solution

The correct option is D blue
The given organic compound is mixed with dry copper oxide ( $C u O$ ) and heated in a hard glass tube. The products of the reaction are passed over (white) anhydrous copper sulphate and then bubbled through lime water. If copper sulphate turns blue due to the formation of $C u S O_{4} .5 H_{2} O$ (by water vapor) then the compound contains hydrogen. If lime water is turned milky by $C O_{2}$ , then the compound contains carbon.

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Similar questions

Q. Water vapor turns white anhydrous copper sulphate __________.

Q. Answer the questions below, relating your answers only to salts in the following list:
sodium chloride, anhydrous calcium chloride, copper sulphate-5-water.
(i) What is the name given to the water in the compound copper sulphate-5-water?
(ii) If copper sulphate-5-water is heated, the water is driven off leaving anhydrous copper sulphate. What is the colour of anhydrous copper sulphate?
(iii) By what means, other than heating, can you dehydrate copper sulphate-5-water and obtain anhydrous copper sulphate?
(iv) Which one of the salts in the given list is deliquescent?

(a) What is meant by "water of crystallisation" in a substance? Explain with an example.

(b) How would you show that blue copper sulphate crystals contain water of crystallisation?

Assertion: Upal observed that copper is deposited on the negative electrode connected to the terminal of the battery. Kavya performed the same experiment but she replaced the copper electrode with a carbon electrode and still observed copper is deposited over carbon rod.

Reason: Copper sulphate solution dissociates into copper and sulphate ions when electricity is passed through dilute copper sulphate solution and this free copper ions deposit on the carbon rod.

Q. Question 18
Zinc sulphate forms a colourless solution in water. Will you observe any colour on adding copper turnings in it?

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