Q. 14.3( 13 Votes )
Calcium oxide reacts vigorously with water to produce:
A. Calcium hydroxide releasing a large amount of heat.
B. Calcium hydroxide absorbing a large amount of heat.
C. Calcium oxide and hydrogen with a release of large amount of heat.
D. Calcium oxide any hydrogen with a absorption of large amount of heat.
When calcium oxide- CaO is added to water, it reacts vigorously with water to produce slaked lime (calcium hydroxide) and releases a large amount of heat.
The reaction that takes place is:
CaO + H2O → Ca(OH)2
Quick lime Slaked lime
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Which among the following statement(s) is(are) true? Exposure of silver chloride to sunlight for a long duration turns grey due to:
(i) The formation of silver by decomposition of silver chloride
(ii) Sublimation of silver chloride
(iii) Decomposition of chlorine gas from silver chloride
(iv) Oxidation of silver chlorideEvergreen Science
Which of the following are exothermic processes?
(i) Reaction of water with quicklime
(ii) Dilution of an acid
(iii) Evaporation of water
(iv) Sublimation of camphor (crystals)Evergreen Science