Question:

Hypo is used in photography to

Updated On: Jul 13, 2024
  • reduce AgBr grains to metallic silver
  • convert metallic silver to silver salt
  • remove undecomposed silver bromide as a soluble complex
  • remove reduced silver
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The Correct Option is C

Solution and Explanation

After the developing, the sensitive emulsion of
silver bromide is still present on the plate in the
parts unaffected by light. Therefore, it is necessary
to remove it in order to get the permanent image.
This process is called fixing of image. The negative
plate after washing is dipped in a fixing solution of
sodium thiosulphate (hypo). It dissolves unaffected
silver bromide but leaves metallic silver unaffected.
$ 2Na_2S_2O_3 + AgBr\longrightarrow Na_3[Ag(S_2O_3)_2] + NaBr$
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Concepts Used:

D and F Block Elements

The d-block elements are placed in groups 3-12 and F-block elements with 4f and 5f orbital filled progressively. The general electronic configuration of d block elements and f- block elements are (n-1) d 1-10 ns 1-2 and (n-2) f 1-14 (n-1) d1 ns2 respectively. They are commonly known as transition elements because they exhibit multiple oxidation states because of the d-d transition which is possible by the availability of vacant d orbitals in these elements. 

They have variable Oxidation States as well as are good catalysts because they provide a large surface area for the absorption of reaction. They show variable oxidation states to form intermediate with reactants easily. They are mostly lanthanoids and show lanthanoid contraction. Since differentiating electrons enter in an anti-penultimate f subshell. Therefore, these elements are also called inner transition elements.

Read More: The d and f block elements