7. D (1) 8. A (1) 9. A (1) 10. A (1) 11. (a) Paper X Blue; Paper Y Red Both correct (1) − – (b) Ammonium chloride (correct formula accepted) (1)
7. D (1) 8. A (1) 9. A (1) 10. A (1) 11. (a) Paper X − Blue; Paper Y – Red Both correct (1) (b) Ammonium chloride (correct formula accepted) (1)