NEET Chemistry The s-Block Elements Questions Solved

A hydrated water soluble salt, A in solution gives a turbidity with dilute hydrochloric acid evolving a gas with a suffocation odour. The solution of A decolourises lodine solution. A is likely to be

(A) KI                                         

(B) Na2SO4.10H2O

(C) Na2S2O3.5H2O                   

 (D) AgNO3

(C). The reactions are


2Na2S2O3+I22NaI+Na2S4O6Sodium tetrathionate

Difficulty Level:

  • 17%
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