Chemistry enrichment.?

This question is based on the properties and reactions of aqueous ammonia and other substances.

"A" is a colourless acid solution that reacts with aqueous barium nitrate to form "B" that is a white precipitate.
The colourless acid solution "A" reacts with aqueous ammonia to form "C" that is a white salt that reacts with aqueous sodium hydroxide to produce a colourless gas that is "D".

Q1: Suggest the identity of the substances A, B, C and D.

Q2: Write the equation, including state symbols, for all these reactions.

Solve these questions correct with detailed workings and earn points! :)

Answer:
A is HCl. HCl + Ba(NO3)2-----> BaCl2 + HNO3

B is BaCl2. HCl + NH3 ( aq) -->NH4Cl

C is NH4Cl. NH4Cl + NaOH (aq) -->NH3...
D is NH3 gas.

Is this right? If, yes give me 10 points otherwise, i have automatically earned 2 points.

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