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JEE Main2015Chemistryd and f Block ElementsActual

Which of the following statements is/are false?

Options

  1. AN a 2 C r 2 O 7 is more soluble than K 2 C r 2 O 7 .
  2. BC r O 4 2 - is tetrahedral in shape.
  3. CN a 2 C r 2 O 7 is the primary standard in volumetry.
  4. DC r 2 O 7 2 - has a C r - O - C r bond.

Correct answer

C. N a 2 C r 2 O 7 is the primary standard in volumetry.

Step-by-step solution

It is true Na 2 Cr 2 O 7 is more soluble than K 2 Cr 2 O 7 . CrO 4 − 2 Is tetrahedral: N a 2 C r 2 O 7 is not the primary standard but K 2 C r 2 O 7 (acidic) is the primary standard reagent for titration because sodium dichromate is Hygroscopic in nature, that means it absorb moisture from atmosphere, that will cause incorrect reading in titration.

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