In a ______________ reaction two or more substances combine to form a new single substance.

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Solution

When two or more compounds combine to form one single product in a chemical reaction it is said to be a combination reaction.
In a combination reaction $A + B \to AB$ .
For example, aluminium reacts or combines with oxygen to form aluminium oxide.
$4 Al (s) + 3 O_{2} (g) \to 2 {Al}_{2} O_{3} (aq)$
Hence, in a combination reaction, two or more substances combine to form a new single substance.

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Fill in the blanks :

(a) A reaction in which two or more substances combine to form a single substance is called a ___ reaction.

(b) A ___ is a substance which changes the rate of a chemical reaction without undergoing a chemical change.

(d) The reaction between an acid and a base is called ___

(e) Soluble bases are called ___

(f) The chemical change involving iron and hydrochloric acid illustrates a ___ reaction.

(g) In the type of reaction called ___ two compounds exchange their positive and negative radicals respectively.

(h) A catalyst either ___ or ___ the rate of a chemical change but itself remains ___ at the end of the reaction.

(i) The chemical reaction between hydogen and chlorine is a ___ reaction

(j) When a piece of copper is added to silver nitrate solutuions, it turns ___ in colour.

A reaction in which two or more substances combine to give a new compound is called ____________ reaction.

Assertion: Chemical combinations always take place between two elements.

Reason: A single substance is formed in a combination reaction.

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