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Beryllium oxide (BeO) is an amphoteric oxide because it can react with both acids and bases.

Charcoal is an amorphous allotrope of carbon known for its highly porous structure. Specifically, animal charcoal (bone char) or activated carbon is used in the sugar industry to remove colored impurities from raw sugar syrup through a process called adsorption. These impurities are physically trapped on the large surface area of the charcoal particles, resulting in the clear solution needed to produce white refined sugar.

In the periodic table, the group number (the vertical column) indicates the number of valence electrons for main group elements (Groups 1, 2, and 13–18). For example: Elements in Group 1 have 1 valence electron, elements in Group 2 have 2 valence electrons etc

Nucleons are the subatomic particles that reside within the atomic nucleus. Specifically, they are: (i)Protons: Positively charged particles that determine the atomic number of an element. (ii)Neutrons: Electrically neutral particles that contribute to the mass and stability of the nucleus.

The ion present in the solution is Iron(II) (Fe\(^{2+}\)). When aqueous sodium hydroxide (NaOH) is added to a solution containing iron(II) ions, a dirty green precipitate of iron(II) hydroxide, (Fe(OH)\(_2\)), forms. This precipitate is insoluble in excess sodium hydroxide.

The chemical formula C\(_2\)H\(_4\) represents ethene (also known as ethylene), which is the simplest alkene containing a double covalent bond between two carbon atoms.During addition polymerization, the double bond between the carbon atoms in the ethene monomers breaks under high pressure and temperature. These monomers link together in a long chain of repeating units to form polyethene (or polyethylene), a widely used plastic.

In the scientific method, a hypothesis is a tentative explanation or an educated guess that can be tested through experimentation. When a hypothesis is rigorously tested and supported by a significant amount of evidence within the limits of what is currently known, it is elevated to the status of a theory.

The empirical formula is defined as the chemical formula that represents the simplest whole-number ratio of the atoms of each element present in a compound. For this reason, it is also frequently referred to as the simplest formula.

The empirical formula is defined as the chemical formula that represents the simplest whole-number ratio of the atoms of each element present in a compound. For this reason, it is also frequently referred to as the simplest formula.

The word 'posh' refers to something stylish, elegant, or luxurious. The opposite of 'posh' in this context would be something simple or unpretentious, hence the word 'modest' is the correct answer.

The word 'trivial' refers to something of little value or importance. The opposite of 'trivial' would be something of great importance or seriousness, hence the word 'serious' is the correct answer.

The word 'stellar' refers to something outstanding or exceptional. The opposite of 'stellar' would be something ordinary or common, hence the word 'mundane' is the correct answer.

The word 'sanctioned' refers to a penalty for a wrongdoing. The opposite of 'sanctioned' would be to be forgiven or excused, hence the word 'pardoned' is the correct answer.

The word 'dogged' refers to something persistent or tenacious. The opposite of 'dogged' would be something uncertain or fluctuating, hence the word 'wavering' is the correct answer.

The word 'terminating' means to bring to an end. The opposite of this would be to start or initiate something. Therefore, the correct answer is 'initiating'.