IIT-JEE Exam

Which of the following halides react(s) withAgNO3(aq) to give a precipitate that dissolves in Na2S2O3(aq) ?
(A) HCl (B) HF (C)HBr (D)HI

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IIT-JEE Other Question
Choose the correct reason(s) for the stability of the lyophobic colloidal particles.
(A) Preferential adsorption of ions on their surface from the solution.
(B) Preferential adsorption of solvent on their surface from the solution.
(C) Attraction between different particles having opposite charges on their surface.
(D) Potential difference between the fixed layer and the diffused layer of opposite charges around the colloidal
particles. 29.2% (w/w) HCl stock solution has a density of 1.25 g mL–1. The molecular weight of HCl is 36.5 g mol–1. The
volume (mL) of stock solution required to prepare a 200 mL solution of 0.4 M HCl is