Examine the reactants of the incomplete double-displacement reaction. 2nacl + h2so4 → which of the answer choices correctly predicts the product of the double-displacement reaction?

sodium chloride and sulphuric acid are reactants .

sodium sulphate and hydrochloric acid are products.

Explanation:

Reactants of a chemical reaction is defined as the substances which take part in a chemical reaction and undergoes a chemical change. Reactants are written on left side of the arrow.

Products are defined as the substance which are formed at the end of the chemical reaction.Products are written on the right side of the arrow.

Double displacement reaction is one in which exchange of ions take place.  

Thus sodium chloride and sulphuric acid are reactants and sodium sulphate and hydrochloric acid are products and all are present in aqueous (aq) state.

considering the question as per the attachment

here we can see that the radon nuclide has 222 as the atomic mass number and 86 as the atomic number.

when it undergoes nuclear fission it gives polonium which has atomic mass number as 218 and atomic number will be 84 along with a helium nucleus which has 4 atomic mass number and 2 as its atomic number.

222 = 218 + 4 (atomic mass number)

86 = ? + 2; therefore ? = 86-2 = 84.

the atomic mass number of polonium will be 84.