Answer to Question #10596 in Chemistry for Valerie

Question

1) You are given a mixture of silver and barium carbonate. Which of the following sequences would enable you to obtain a pure sample of silver.
A Add aqueous sodium chloride, filter and crystalize
B Add aqueous sodium chloride, stir and filter
C Add dilute hydrochloric acid, stir and filter
D Add dilute sulfuric acid, stir and filter.

2) Powdered calcium carbonate is commonly placed in chimneys of coal-buring power stations to remove waste gases. Which waste gas will not be removed by the powdered calcium carbonate
A Sulfur dioxide
B Nitrogen Dioxide
C Carbon monoxide
D Phosphorous(V) oxide
My ans for the 2nd Q is C but I am not sure

Answer 1

1. C Add dilute hydrochloric acid, stir and filter

BaCO₃ + 2HCl(dilute) = BaCl₂(soluble) + CO₂ + H₂O
Ag(solid) + HCl(dilute) -x->

2. C Carbon monoxide
CaCO₃ + SO₂ --> CaSO₃ + CO₂
2CaCO₃ + 4NO₂ --> Ca(NO₃)₂ + Ca(NO₂)₂ + 2CO₂
CaCO₃ + CO -x->
3CaCO₃ + P₂O₅ --> Ca₃(PO₄)₂ + 3CO₂