9
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Evidence of Chemical Reactions

Question 9 • CHS Chemistry A

Na2S + Cd(NO3)2 → CdS + 2NaNO3

Answer
A
cadmium sulfide
B
sodium nitrate
C
cadmium nitrate
D
no precipitate formed

Explanation

In this double-replacement reaction, the products are CdS and NaNO3. Cadmium sulfide (CdS) is insoluble in water, so it forms a solid precipitate, while sodium nitrate remains dissolved. Therefore, the precipitate is cadmium sulfide.

AI-written and checked against the verified answer.

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