Consider the following statements about crystalline solids:
(in) molecules or atoms in molecular solids are held together by intermolecular forces.
(ii) metallic solids have atoms in the points of the crystal lattice.
(iii) ionic solids have formula units in the point of the crystal lattice.
(iv) atoms in covalent-network solids are connected via a network of covalent bonds.
which of the statements is false?

Statements (iii) is false

Explanation:

Ionic solids do not have formula units in the points of the crystal lattice, instead, they have ions in the points of the lattice.

Consider the example of NaCl. Here Na⁺ is the cation while Cl⁻ is the anion, together they form a cubic unit cell by the electrostatic attraction between them. A crystal lattice defines the arrangement of atoms or molecules in a crystal, and the points on it represent the species which are responsible for the ordered arrangement. In the case of ionic solids, these species are ions, as they are responsible for electrostatic attraction or repulsion causing an ordered arrangement around it.

answer:

the reaction is type of combination reaction.

explanation:

on the product side, there are 2 molecules of bonded to fe   which means one atom of fe are combined two molecules of . so, balanced chemical equation becomes :

this reaction follows the reaction type of combination reaction. a combination reaction is defined as chemical reaction in which reactants combines together to form a single product.

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