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Applications of Electrolysis and Electrolytic Cell

Write down th...

Question

Write down the changes that will be seen in each instance and explain the reason behind it.
"Magnesium oxide was added to dilute HCl and magnesium oxide was a added to dilute NaOH."

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Solution

Metal oxides react with acids to form metal salts and water.
Hence, Magnesium oxide reacts with dilute HCl to form magnesium chloride and water.

Magnesium oxide does not react with dilute NaOH.

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Similar questions

Write down the changes that will be seen in each instance and explain the reason behind it.

(a) 50ml water is added to 50ml solution of copper sulphate.

(b) Two drops of the indicator phenlphthalein were added to 10ml solution of sodium hydroxide.

(c) Two or three filings of copper were added to 10ml dilute nitric acid and stirred.

(d) A litmus paper was dropped into 2ml dilute HCl. Then 2ml concentrated NaOH was added to it and stirred.

(e) Magnesium oxide was added to dilute HCl and magnesium oxide was a added to dilute NaOH.

(f) Zinc oxide was added to dilute HCl and zinc oxide was added to dilute NaOH.

(g) Dilute HCl was added to limestone.

(h) Pieces of blue vitriol were heated in a test tube. On cooling, water was added to it.

(i) Dilute H 2 SO 4 was taken in an electrolytic cell and electric current was passed through it.

Q. Write down the changes that will be seen in this instance and explain the reason behind it.
"A litmus paper was dropped into 2ml dilute HCl. Then 2ml concentrated NaOH was added to it and stirred."

Q. Zinc oxide was added to dilute HCl and zinc oxide was added to dilute NaOH.Explain the difference?

Write the chemical equations for the following activities.

(a) NaOH solution was added to HCl solution.

(b) Zinc dust was added to dilute H₂ SO₄ .

(c) Dilute nitric acid was added to calcium oxide.

(e) Carbon dioxide gas was passed through KOH solution.

(f) Dilute HCl was poured on baking soda.

Q. Write down the changes that will be seen in the instance and explain the reason behind it.
50 ml water is added to 50 ml solution of copper sulphate.

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