Calcium reacts vigorously with water to produce slaked lime. This reaction can be classified as:
I. Combination Reaction
II. Endothermic Reaction
III. Exothermic Reaction
IV. Decomposition Reaction
V. Double decomposition Reaction

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Q. (a) What do you understand by exothermic and endothermic reactions?
(b) Give one example of an exothermic reaction and one of an endothermic reaction.
(c) Which of the following are endothermic reactions and which are exothermic reactions?
(i) Burning of natural gas
(ii) Photosynthesis
(iii) Electrolysis of water
(iv) Respiration
(v) Decomposition of calcium carbonate

(a) What do you understand by exothermic and endothermic reactions ?

(b) Give one example of an exothermic reaction and one of an endothermic reaction.

(i) Buring of natural gas (ii) Photosynthesis

(iii) Electrolysis of water (iv) Respitation

(v) Decomposition of calcium carbonate

Question 9

Solid calcium oxide reacts vigorously with water to form calcium hydroxide accompanied by liberation of heat. This process is called slaking of lime. Calcium hydroxide dissolves in water to form its solution called lime water. Which among the following is (are) true about slaking of lime and the solution formed?

(i) It is an endothermic reaction
(ii) It is an exothermic reaction
(iii) The pH of the resulting solution will be more than seven
(iv) The pH of the resulting solution will be less than seven

(a) (i) and (ii)
(b) (ii) and (iii)
(c) (i) and (iv)
(d) (iii) and (iv)

Q. Carbon reacts vigorously with oxygen to produce carbon dioxide.

This reaction can be classified as:

C (g) + O_{2} (g) \to {CO}_{2} (g) + Heat

I. Combination Reaction
II. Endothermic Reaction
III. Exothermic Reaction
IV. Decomposition Reaction
V. Double decomposition Reaction

Q. Calcium reacts vigorously with water to produce slaked lime. This reaction can be classified as:
I. Combination Reaction
II. Endothermic Reaction
III. Exothermic Reaction

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Calcium reacts vigorously with water to produce slaked lime. This reaction can be classified as: I. Combination Reaction II. Endothermic Reaction III. Exothermic Reaction IV. Decomposition Reaction V. Double decomposition Reaction

Calcium reacts vigorously with water to produce slaked lime. This reaction can be classified as:
I. Combination Reaction
II. Endothermic Reaction
III. Exothermic Reaction
IV. Decomposition Reaction
V. Double decomposition Reaction