HARDMCQ SINGLEIChO (Chemistry Olympiad)Inorganic Chemistryd and f Block elementsAchiever Section

Sodium thiosulphate, Na₂S₂O₃. 5H₂O is used in photography to :

A.Reduce the silver bromide to metallic silver

B.Convert the metallic silver to silver salt

C.remove undecomposed AgBr as soluble silver

D.remove reduced silver✓ Correct

Explanation

2 2 3 3 2 3 2 2Na S O +AgBr Na Ag S O +NaBr → 10. When AgNO₃ comes in contact with skin, it leaves a black stain. This is because of : (a) HNO₃ produced by hydrolysis of AgNO₃ (b) AgOH produced by hydrolysis of AgNO₃ (c) Its reduction of silver (d) Its oxidation to silver oxide Its reduction of silver 11. The oxidation state of copper changes when aqueous copper (II) ions react with : (I) NaOH (aq) (II) Fe(s) (III) KI (aq) (a) I, II, III (b) II only (c) II, III (d) I only For (I) NaOH, the

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