Identify a sequence of substances.

Chemistry Level 2

Given a sequence of chemical reactions below starting at A 1 A_1 :

A 1 + N a O H A 2 + H C l A 3 + O X 2 ( t o ) A 4 + H X 2 O + N H X 3 ( * ) A 5 + H X 2 O X + B r X 2 A 6 + B a C l X 2 A 7 + A g N O X 3 A 8 A_1 \overset{+\ce{NaOH}}{\to}A_2 \overset{\ce{+HCl}}{\to}A_3 \overset{+\ce{O_2} (t^o)}{\rightarrow}A_4 \overset{\ce{+H_2O + NH_3} (\text{*})}{\to}A_5 \overset{\ce{+H_2O+Br_2}}{\to}A_6 \overset{\ce{+BaCl_2}}{\to}A_7 \overset{\ce{+AgNO_3}}{\to}A_8

( ) (*) means that this substance is excessive.

We know that A 1 A_1 contains 3 elements, one of which is S S and A 8 A_8 is a white powder. Identify A 1 A_1 .

Bonus: Identify all unknown substances.

H X 2 S O X 3 \ce{H_2SO_3} H X 2 S O X 4 \ce{H_2SO_4} N H X 4 H S \ce{NH_4HS} F e S O X 3 \ce{FeSO_3} All of the other answers are incorrect

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