The melting point of oxygen difluoride( OF2) is around −223.8 °C or −370.8 °F. If we talk about the chemical composition of OF2, it consists of 1 Oxygen atom and 2 fluorine atoms. Accordingly, the two fluorine atoms form a single covalent bond with an oxygen atom.

Oxygen difluoride

Oxygen difluoride, OF2 , is a polar molecule because it has a bent molecular geometry. This molecular geometry ensures that the dipole moments associated with the oxygen – fluoride bonds do not cancel each other out to produce a nonpolar molecule.

Oxygen difluoride will dissolve in water forming a neutral solution but will only slowly hydrolyse giving a solution containing HF which will be acidic. So your book is correct, at least in the short term, the solution will be neutral.

The oxygen atom of the water molecule contains two lone pairs, so water is a Lewis base, while the sulfur atom in SO3 has only three electron regions, which makes SO3 Lewis acidic.

SO3 to be a Lewis acid, it would have to react in such a way that it accepted a lone pair from some other atom or molecule (from a Lewis base). It turns out that sulfur very readily accepts electrons from other molecules, which is why it generally behaves as a Lewis acid.

Na2O or sodium oxide is a base as it is a metal oxide, and can’t qualify as an acid as it lacks H+ ion (bronsted lowry theory).

Lewis acid are those compounds who have incomplete octate or complete octate which is able to keep more electrons in its outer shell. Here more refers to greater than 8 electrons in its outermost orbit. Now, sicl4 is able to keep greater than 8 electrons in its outermost orbit. So it does not behave as a Lewis acid.

The weakly acidic species, silicon tetrachloride (SiCl4), can be activated by binding of a strongly Lewis basic chiral phosphoramide, leading to in situ formation of a chiral Lewis acid.

Carbon tetrachloride is NEITHER an acid nor a base.

Complete answer: CCl4is used as fire extinguishers under the name of pyrene. The dense vapours of carbon tetrachloride forms a protective layer on the burning objects and avoids the oxygen or air to come in contact with the fire from the burning objects and provides incombustible vapours.

Chloroform

Carbon tetrachloride (CCl4) is a manufactured chemical. CCl4 is not flammable and does not dissolve very easily in water.

Carbon tetrachloride

Dinitrogen Tetraoxide

Carbon tetrachloride

Nitrogen Triiodide

POTASSIUM BROMIDE

It is an extremely sensitive contact explosive: small quantities explode with a loud, sharp snap when touched even lightly, releasing a purple cloud of iodine vapor; it can even be detonated by alpha radiation….Nitrogen triiodide.