What is the equation of aluminium forms aluminium oxide ?
4Al + 3O2 → 2Al2O3
4Al + 3H+O2 → 2Al+2O3
4Cu + 3OH → 2Al2O3
Al + 3O2 → 2Al2+O3
The question asks for the balanced chemical equation representing the formation of aluminium oxide from aluminium and oxygen. This involves understanding the reactants, the product, and balancing the equation according to the law of conservation of mass.
A) 4Al + 3O\(_2\) \(\rightarrow\) 2Al\(_2\)O\(_3\) — This equation correctly represents the reaction of aluminium with oxygen to form aluminium oxide, and it is stoichiometrically balanced.
To determine the formula of copper oxide, we need to understand the common valencies of copper and oxygen and how they combine to form a neutral compound. Copper can exist in two common oxidation states: \(+1\) (cuprous) and \(+2\) (cupric). Oxygen typically has an oxidation state of \(-2\).
C) CuO is the chemical formula for copper(II) oxide, which is the most common form of copper oxide. In this compound, copper has an oxidation state of \(+2\), and oxygen has an oxidation state of \(-2\), resulting in a neutral compound.
Whose reactions of Al2O3 + 6HCl → 2AlCl3 + 3H2O ?
Oxide Reacts
Nitrogen Reacts
Carbon Dioxide Reacts
Aluminium Oxide Reacts
The question asks to identify the reactant in the given chemical equation. We need to analyze the chemical formula of each reactant and product to determine which substance is reacting with hydrochloric acid.
Therefore, the reaction involves Aluminium Oxide reacting with Hydrochloric Acid.
D) Aluminium Oxide Reacts — The chemical formula \( \text{Al}_2\text{O}_3 \) represents Aluminium Oxide, which is one of the reactants in the given equation. The question is asking to identify this specific reactant.
The question asks to identify a class of compounds that are generally insoluble in water but can form alkalis when some of their members dissolve in water. We need to evaluate each option based on its general properties and reactivity with water.
A) Metal Oxides are generally insoluble in water, but oxides of reactive metals (like alkali and alkaline earth metals) dissolve in water to form corresponding metal hydroxides, which are alkalis. This matches the given statement.
What type of reaction : Na2O(s) + H2O(l) → 2NaOH(aq)
Overall Reaction
Decomposition Reaction
Synthesis Reaction
No Reaction
The question asks to identify the type of chemical reaction given: Na2O(s) + H2O(l) → 2NaOH(aq). We need to analyze the reactants and products to classify the reaction.
Correct Option: C) Synthesis Reaction
The reaction Na2O(s) + H2O(l) → 2NaOH(aq) involves two reactants combining to form a single, more complex product. This is the characteristic of a synthesis or combination reaction.
This question tests knowledge about the phenomenon of passivation in metals, where a protective layer forms on the surface, preventing further corrosion or oxidation.
Correct Option: B) Oxide Layer — A stable, non-porous oxide layer formed on the metal surface acts as a barrier, preventing further reaction of the metal with oxygen and thus protecting it from further oxidation.