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1. |
When a flask containing sodium thiosulfate is placed over a paper marked with ‘X’ and HCl added to it, the ‘X’ seems to disappear when looked through the flask. Why? |
A. | Because of formation of sodium chloride |
B. | Because of sulfur precipitating |
C. | Because of release of yellowish chlorine gas |
D. | Because of dissolution of sulfur |
Answer» C. Because of release of yellowish chlorine gas | |