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Preparations and Uses of Sodium Carbonate

Question 53 A...

Question

Question 53
An element A reacts with water to form a compound B which is used in whitewashing. The compound B on heating forms an oxide C which on treatment with water gives back B. Identify A, B and C and give the reactions involved.

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Solution

The compound that is used in whitewashing is slaked lime with chemical formula ${Ca(OH)}_{2}$ . This, on heating, gives the calcium oxide which again gives calcium hydroxide on treatment with water.

Therefore, $A - Ca; B - {Ca(OH)}_{2}; C - CaO$

The reactions involved are:
$Ca(s) + 2 H_{2} O \to {Ca(OH)}_{2} (aq) + H_{2} (g)$
${Ca(OH)}_{2} (aq) Heat - - \to CaO (aq) + H_{2} O (l)$

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Question 53
An element A reacts with water to form a compound B which is used in whitewashing. The compound B on heating forms an oxide C which on treatment with water gives back B. Identify A, B and C and give the reactions involved.

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Question 54
An alkali metal A gives a compound B (molecular mass = 40) on reacting with water. The compound B gives a soluble compound C on treatment with aluminium oxide. Identify A, B and C and give the reaction involved.

Q. Question 52
A compounds C (molecular formula

C_{2} H_{4} O_{2}

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metal to form a compound R and evolves a gas which burns with a pop sound. Compound C on treatment with an alcohol A in presence of acid forms a sweet smelling compound S (molecular compounds

C_{3} H_{6} O_{2}

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Q. An monovalent metal A gives a compound B (molecular mass = 40) on reacting with water. The compound B gives a soluble compound C on treatment with aluminium oxide. Identify A, B and C and give the reaction involved.

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Preparations and Uses of Sodium Carbonate

Standard IX Chemistry

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