Heating of a mixture consisting of potassiumm nitrate , carbon and sulphur involves which of the following chemical changes ?

Options

A. Decomposition and combination.
B. Double decomposition.
C. Combination and displacement.
D. Displacement and decomposition.

Answer

1

Explanation

Gunpoweder is mixture of `KNO_(3)`, sulphur and coke . When it is heated `KNO_(3)` undergoes decomposition to produce `O_(2)and KNO_(2)`. S and C burin in the presence of `O_(2)` producing `SO_(2)and CO_(2)`.
`2KNO_(3)overset(Delta)to2KNO_(2)+O_(2)`
`C+O_(2)toSO_(2)`
`C+O_(2)toCO_(2)`
Hence , the type of chemical change involved is decomposition and combination.