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Efflorescence,Hygroscopy and Deliquescence

Statement 1: ...

Question

Statement 1: On heating, a blue-coloured salt ‘X’ undergoes a change and copper sulphate (white coloured powder) is formed. On moistening this white powder, its colour changes back to blue.

Statement 2: Salt X contains water of crystallisation.

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Solution

Option C is correct: Both the statements are true.

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Similar questions

(a) Why does common salt get wet during the rainy season ?

(b) How can this impurity be removed ?

(c) Name a substance which changes the blue colour of copper sulphate crystals to white.

(d) Name two crystalline substances which do not contain water of crystallisation.

Q. When a blue coloured copper salt is heated strongly, it forms a white copper salt. The white copper salt can be reconverted into blue copper salt by adding a liquid X.
(a) Write the formula of blue copper salt.
(b) Write the formula of white copper salt.
(c) What substance is lost when blue copper salt is converted into white copper salt?
(d) Name the liquid X.

Q. (a) During photosynthesis, green plants prepare glucose with the help of carbon dioxide from the air and water from the soil. Is photosynthesis a physical change or a chemical change? Justify your answer.
(b) Copper sulphate is a blue coloured chemical. When it is heated, the blue colour disappears and it turns white. After is cools, if a few drops of water are put into the test tube, the copper sulphate turns blue again. Is this a physical or a chemical change?

Correct the given incorrect statement “ On heating white powder of copper sulphate changes into blue crystal”.

C u S O_{4} . 5 H_{2} O

on heating produces a salt X which is white powder along with molecules of Y. Y thus produced can change the colour of blue cobalt chloride to pale pink.. What is X and Y ? Explain the chemistry behind this.

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