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Question

When Calcium oxide is added to water taken in a beaker, rise in temperature is observed. However, when Barium hydroxide is mixed with Ammonium chloride, a fall in temperature is observed. Why?

.A Magnesium ribbon is burnt in oxygen to give a white compound X accompanied by emission of light. If the burning ribbon is now placed in an atmosphere of nitrogen, it continues to burn and forms a compound Y.

(i).Write the chemical formulae of X and Y

(ii).Write the balanced chemical equation when X is dissolved in water

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Solution

1) When Calcium oxide is added to water taken in a beaker, following reaction takes place:

CaO + H2O → Ca(OH)2 + heat

Since the reaction is exothermic, rise in temperature is observed.

When Barium hydroxide is mixed with Ammonium chloride, following reaction takes place:

2NH4Cl + Ba(OH)2 → BaCl2 + 2NH3 + 2H2O

This is an endothermic reaction.Thus, a fall in temperature is observed.

2. (i) X is MgO and Y is Mg3N2

(ii) MgO + H2O → Mg(OH) 2


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