A student heated some lime stone and recorded the following Assertion and Reason:- (A) Heating of lime stone in air is an oxidation process. (R) An oxide of the metal is formed. Choose the most appropriate option:
(a) Both A and R are true, and R is the correct explanation of A
(b) Both A and R are true, and R is not the correct explanation of A
(c) A is true but R is false.
(d) A is false but R is true
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a)A student states that burning of lime in air is an oxidation process. The reason he gives is that an oxide of the metal is produced on burning. ... When Ca is heated in oxygen it changes to CaO i.e., metal oxide is formed. But lime cannot be further oxidised.
b)Metal oxides are crystalline solids that contain a metal cation and an oxide anion. They typically react with water to form bases or with acids to form salts. MO + H2O → M(OH)2 (where M = group 2 metal) Thus, these compounds are often called basic oxides.
Explanation - so both are true
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