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.

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"among the transition metal elements, manganese and zinc have a slight lowering of electronegativities. the reason behind this is that the nuclear charges of these elements are slightly weaker than the other transition metal elements due to the way their valence electrons are filled up. both manganese and zinc have their valence electrons filled up to the 4th shell with 1 pair of electrons (4s2) completely occupying it. although the electrons in the 3rd shell (3d) are yet to be paired since the outer most shell is filled up, the ability of the nucleus to attract electrons is lessened. hence,   the electronegativity (or the ability to attract electrons) is lessened."