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
1. C Add dilute hydrochloric acid, stir and filter
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