Question

Four labelled solution A, B, C, D along with Reddish -Brown, Dark Grey Blue, silver, white which has an aluminium strip?

Answer 1

Hint : This is why most metals are white or silver, and a smooth surface, which does not allow light to penetrate deeply, will be highly reflecting. All the distinct hues in white light will be reflected equally well if the efficiency of absorption and re-emission is about equal at all optical energies.

Complete Step By Step Answer:
Copper is a chemical element with the atomic number 29 and the symbol Cu. It's a ductile, malleable metal with excellent thermal and electrical conductivity. A freshly exposed pure copper surface is pinkish-orange in hue. Copper is used as a heat and electricity conductor, a construction material, and a component of numerous metal alloys, including sterling silver for jewellery, cupronickel for nautical gear and coinage, and constantan for strain gauges and thermocouples for temperature monitoring.
The most significant copper salt is cupric sulphate ( $CuS{O_4}$ ), often known as blue vitriol. $CuS{O_4}.5{H_2}O$ is the most common crystal form, and it has a vivid blue colour. Copper oxides are treated with sulfuric acid to create it.
Aluminium is a chemical element with the atomic number 13 and the symbol Al. Aluminium has a lower density than most other common metals, around one-third that of steel. When exposed to air, it has a strong affinity for oxygen and creates a protective coating of oxide on the surface. Aluminium has a hue that is similar to silver and has a high propensity to reflect light. It is ductile, soft, and non-magnetic. Aluminium has just one stable isotope, $^{27}Al$ , which is quite common, making it the tenth most abundant element in the Universe. In radiodating, the radioactivity of $^{26}Al$ is employed. It is silvery gray metallic in nature.
Calcium is a white, soft metal that tarnishes quickly and interacts with water when exposed to air. Other metals, such as thorium and uranium, are produced using calcium metal as a reducing agent. Aluminium, beryllium, copper, lead, and magnesium alloys all employ it as an alloying agent.
Hence aluminium is correct.

Note :
Aluminium is a chemically weak metal in the boron group, and it forms compounds largely in the +3 oxidation state, as is typical of the group. Because the aluminium cation $A{l^{3 + }}$ is tiny and strongly charged, it is polarising, and bonds formed by aluminium tend to be covalent. Because of its great affinity for oxygen, aluminium is frequently found in nature as oxides; as a result, aluminium is found largely in rocks in the crust, where it is the third most prevalent element after oxygen and silicon, rather than in the mantle, and almost never as a free metal.