Of the molecules below, only is polar.a. SiCl4 b. CH4 c. CCl4 d. SeF4

SeF4 is a polar molecule

Explanation:

SeF4 is a polar molecule because a polar molecule is any molecule that have lone pairs of electrons in the central atom or have atoms that are electronegative and the electrons between that are covalently bonded are not evenly distributed.

The electronegative atoms of flourine in SeF4 are not evenly distributed and kind pairs of electrons are on the central atom.

Answer : Yes, the given chemical reaction obey the law of conservation of mass.

Explanation :

Law of conservation of mass : It states that mass can neither be created nor be destroyed but it can only be transformed from one form to another form.

The balanced chemical reaction always follow the law of conservation of mass.

Balanced chemical reaction : It is defined as the reaction in which the number of atoms of individual elements present on reactant side must be equal to the product side.

The given chemical reaction is,

This reaction is a balanced chemical reaction in which number of atoms of lead and chlorine are equal on the both side of the reaction. So, this reaction obey the law of conservation of mass.

Hence, the given chemical reaction obey the law of conservation of mass.