HARDMCQ SINGLEJEE Mains ChemistryInorganic 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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