Which of the following statements are true about sodium thiosulphate, ?

CHEMISTRY · Multi correct · A Level · Chemistry · Acids and bases · Acids and bases

Problem

Which of the following statements are true about sodium thiosulphate,

\text{Na}_2\text{S}_2\text{O}_3

? (1) It is used in the estimation of iodine. (2) It can give a black precipitate with

\text{AgNO}_3

. (3) It is used to remove unexposed

\text{AgBr}

from photographic films. (4) It contains ionic, covalent, and coordinate covalent bonds.