The type of reaction is displacement reaction
zinc chloride solution can be kept...

Introduction:
In this scenario, we are provided with an aluminum container and solutions of dilute HCl, dilute HNO3, ZnCl2, and H2O. We need to determine which solution can be safely kept in the aluminum container and explain the type of reaction that takes place.

Compatibility with Aluminum:
Aluminum is a versatile metal widely used in various industries. However, it can react with certain substances, leading to corrosion or damage to the container. Therefore, it is important to consider the compatibility of the solutions with aluminum before storing them in the container.

Reaction with Dilute HCl:
Dilute hydrochloric acid (HCl) is commonly used in laboratories. Unfortunately, it cannot be safely stored in an aluminum container. This is because aluminum reacts with HCl to produce hydrogen gas (H2) and aluminum chloride (AlCl3). The reaction can be represented as follows:
2Al + 6HCl → 3H2 + 2AlCl3
The evolution of hydrogen gas can lead to pressure build-up and potential hazards.

Reaction with Dilute HNO3:
Dilute nitric acid (HNO3) is another common laboratory reagent. Unlike HCl, HNO3 can be stored in an aluminum container. This is because aluminum forms a protective oxide layer on its surface, which prevents further reaction with the acid. The reaction between aluminum and dilute HNO3 initially produces aluminum nitrate (Al(NO3)3) and hydrogen gas, but the oxide layer prevents further reaction:
2Al + 6HNO3 → 2Al(NO3)3 + 3H2

Reaction with ZnCl2:
Zinc chloride (ZnCl2) solution does not react with aluminum. Therefore, it can be safely stored in an aluminum container without any adverse effects.

Reaction with H2O:
Water (H2O) does not react with aluminum under normal conditions. As a result, it can be stored in an aluminum container without any issue.

Type of Reaction:
The reaction between aluminum and hydrochloric acid is an example of a redox reaction. Aluminum is oxidized to form aluminum ions, while hydrogen ions in the acid are reduced to form hydrogen gas. This reaction is also exothermic, meaning it releases heat. On the other hand, the reaction between aluminum and dilute nitric acid is also a redox reaction but is limited due to the formation of the protective oxide layer.

Conclusion:
Out of the solutions provided, dilute HNO3, ZnCl2, and H2O can be safely stored in an aluminum container. Dilute HCl should not be stored in an aluminum container as it reacts with aluminum to produce hydrogen gas. The reactions between aluminum and the solutions involve redox reactions, with the reaction with dilute HCl being more vigorous and potentially hazardous.