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Reaction of Acids with Metal Carbonate

When water is...

Question

When water is added to magnesium oxide ,magnesium hydroxide is produced which is also present in lime water .So, is it correct that the magnesium hydroxide present in lime water and the magnesium hydroxide formed from magnesium oxide and water are one and the same?

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Solution

When magnesium oxide is dissolved in water, magnesium hydroxide is formed. So, the reaction between magnesium oxide and water is a chemical change, as a new substance(magnesium hydroxide) is formed.

MgO+H2O→Mg(OH)2
Chemical formula for lime water :
Ca(OH)2

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Similar questions

Q. Which among the following statements is incorrect for magnesium metal?

(a) It burns in oxygen with a dazzling white flame.
(b) It reacts with cold water to form magnesium oxide and evolves hydrogen gas.
(c) It reacts with hot water to form magnesium hydroxide and evolves hydrogen gas.
(d) It reacts with steam to form magnesium hydroxide and evolves hydrogen gas.

Q. The solubility of magnesium hydroxide in pure water is

8.2 \times 10^{- 5}

mol per 500ml of water. The solubility product of magnesium hydroxide is

Q. Question 3
Magnesium ribbon on burning in air produces

(a) magnesium oxide, water and light
(b) magnesium oxide and heat
(c) magnesium oxide, heat and light
(d) magnesium oxide, water and heat

Q. Question 3
Magnesium ribbon on burning in air produces

(a) magnesium oxide, water and light
(b) magnesium oxide and heat
(c) magnesium oxide, heat and light
(d) magnesium oxide, water and heat

Ammonium hydroxide added to magnesium chloride gives _____ and the precipitate so formed is of _____.

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Reaction of Acids with Metal Carbonate

Standard VII Chemistry

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