Question

Consider the following chemical equation:
X(aq) + sodium chloride (aq) → Y(white ppt) +
Sodium nitrate (aq)​

Answer 1

Answer:

The equation goes-

X + NaCl → Y( white ppt.) + NaNO₃

As one of the products has nitrate, we can assume that the other reactant X is a nitrate compound. This means it has to be either (a) or (c).

Now, please note that the products and reactants always have the same element constituents.

This helps is to eliminate (c) because it is not possible that potassium nitrate  as X will give Y as a silver compound.

So our answer is (a).

EXTRA INFO:

One thing to note is that AgX where Ag= silver and X= halide like chloride/ bromide/ iodide always forms a precipitate. For chloride, it is a white ppt., for bromide it is pale yellow, and for iodide, it is bright yellow. This is in fact a test for the halogens.

Answer 2

In the chemical reaction, X and Y are Silver nitrate and Silver chloride respectively. (OPTION A)

CHEMICAL REACTION -

• The double displacement reaction in which positive and negative ions of two ionic compounds exchange to form new products.
• The exchange of ions takes place in the aqueous solution with the formation of a salt.
• The product formed is in the form of an insoluble precipitate.
• The reaction can be neutralization, gas formation, or salt formation.
• When silver nitrate reacts with sodium chloride, a chemical change occurs.
• The product formed by the double displacement of the ions is Silver chloride and sodium nitrate.
• In the chemical reaction, X and Y are -

X - Silver nitrate

Y - Silver chloride

                                        $AgNO_3(aq) + NaCl (aq)$ → $AgCl + NaNO_3$