Question

Which of the following is an example of a mixture?
(A) $Sugar$
(B) $Brass$
(C) $C{{O}_{2}}$
(D) $N{{O}_{2}}$

Answer 1

Hint: A mixture comprises two or more elements or compounds which are not chemically bonded to each other and thus, separated by physical means. During its physical separation, it retains its component properties.

Complete step by step solution:
In case of sugar, with chemical formula ${{C}_{12}}{{H}_{22}}{{O}_{11}}$ (that is, sucrose), is a compound formed by carbon, hydrogen and oxygen as its component elements which are chemically bonded. Thus, sugar cannot be physically separated into its constituting elements and acts as a whole. In a mixture or solution, the sugar can be mixed, acting as a compound on its own. It is a pure substance.
The $C{{O}_{2}}$ and $N{{O}_{2}}$ are compounds having a chemical bonding between its constituent elements like carbon, oxygen and nitrogen, unlike mixtures.
Whereas, in case of brass, it is a mixture of metals called alloy of copper and zinc in uniform composition forming a homogeneous mixture. It has no chemical bonding between copper and zinc; retaining the chemical properties of constituent elements and a range of brasses can be formed with varying properties.

Hence, the answer to this question is option (C).

Note: The separation in alloys involves a metallurgical method to separate the metals from its ore or alloy. The material is heated such that metal starts to melt and drains away from the other and is collected. This is the liquidation process.
Also, the alloys are prepared as a solid solution or powder form where the components are heated and melted to liquids which are mixed together and allowed to cool off or under high pressure and high temperature, the powder forms are fused together, with the absence of chemical bonding among the constituent elements.