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Question

The formula of calgon is:
  1. Na2[Na4(PO3)6]
  2. Na4[Na2(PO3)6]
  3. Na4[Na2(PO3)3]
  4. Na2[Na4(PO3)4]

A
Na2[Na4(PO3)6]
B
Na4[Na2(PO3)6]
C
Na2[Na4(PO3)4]
D
Na4[Na2(PO3)3]
Solution
Verified by Toppr

The formula of calgon is Na2[Na4(PO3)6]. Calgon is a trade name of a complex salt, sodium hexametaphosphate (NaPO3)6. It is used for softening hard water.
Calgon ionizes to give a complex anion.

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The following reaction happens in which test ?
Na2S + Na2[Fe(CN)5NO] Na4[Fe(CN)5NOS]
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Q2
The compound sodium polymeta phosphate (Na2[Na4(PO3)6]) is called calgon because:
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Q3
The O.S. of Fe in Na2[Fe(CN)5NO] and Na4[Fe(CN)5NOS] is:
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Sulphide ions react with Na2[Fe(NO)(CN)5] to form a purple colored compound Na4[Fe(CN)5(NOS)].

In the reaction, the oxidation state of iron :

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Na2S+Na2[Fe(CN)5NO]X(purplecolor)

What is the formula of X?

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