Combination of any two or more elements or compounds.
Combination of two atoms.
Combination of only same type of compounds.
A
Combination of only same type of compounds.
B
Combination of any two or more elements or compounds.
C
Combination of two atoms.
D
Combination of only same type of elements.
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Solution
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Chemical combination involves combination of any two or more elements or compounds. For examples:
H2+Cl2→2HCl
This is a element - element combination reaction.
CaO+H2O→Ca(OH)2 This is a compound-compound reaction.
Hence, the correct option is (D)
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