Question

answer plz
class 10 cbse​

Answer 1

In a combination reaction, two or more reactants combine to form a single product. For ex- 2H₂ + O₂ ⇒ 2H₂O.  But, in a decomposition reaction, a single reactant breaks down to form two or more than two products. For ex- on passing of heat, calcium carbonate breaks down into calcium oxide and carbon dioxide.

CaCO₃⇒CaO + CO₂

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Answer 2

An instance variable is similar to a class variable. An instance variable is a variable which is declared in a class but outside the constructor and the method/function. Instance variables are created when an object is instantiated, and are accessible to all the methods, the constructor and block in the class.