A white solid consists of a mixture of sodium chloride and sodium iodide. It is dissolved in water in a test-tube. Excess aqueous silver nitrate is then added to the test-tube. A precipitate, X, is formed. Next, excess concentrated ammonia is added to the test-tube that contains X. Once the test-tube has been shaken, a precipitate, Y, is formed. Which statement about X or Y is correct?
- AX is a pure white colour.
- BX is pure silver iodide.
- CY is pure silver chloride.
- DY is yellow.