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Cr(OH)(3) is made soluble in NaOH in pr...

`Cr(OH)_(3)` is made soluble in NaOH in presence of _________(a)________ when (b) _____of____(c ) ____ colour is formed and gives yellow ppt. of (d) _____when (e ) ____ is added.

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To solve the question step by step, we will fill in the blanks based on the information provided in the video transcript. ### Step-by-Step Solution: 1. **Identify the substance that makes Cr(OH)₃ soluble in NaOH:** - Chromium hydroxide (Cr(OH)₃) can be made soluble in NaOH in the presence of **sodium peroxide (Na₂O₂)**. - **Fill in blank (a)**: **Na₂O₂** 2. **Identify the compound formed in the reaction:** - When Cr(OH)₃ is treated with NaOH in the presence of Na₂O₂, it forms **sodium chromate (Na₂CrO₄)**. - **Fill in blank (b)**: **sodium chromate** 3. **Identify the color of the compound formed:** - Sodium chromate is known to have a **yellow color**. - **Fill in blank (c)**: **yellow** 4. **Identify the precipitate formed when lead acetate is added:** - When lead acetate (Pb(CH₃COO)₂) is added to sodium chromate, it forms a yellow precipitate of **lead chromate (PbCrO₄)**. - **Fill in blank (d)**: **lead chromate** 5. **Identify the substance added to form the yellow precipitate:** - The substance added that results in the formation of lead chromate is **lead acetate (Pb(CH₃COO)₂)**. - **Fill in blank (e)**: **lead acetate** ### Final Answers: - (a) **Na₂O₂** - (b) **sodium chromate** - (c) **yellow** - (d) **lead chromate** - (e) **lead acetate** ### Complete Statement: `Cr(OH)₃` is made soluble in NaOH in presence of **Na₂O₂** when **sodium chromate** of **yellow** color is formed and gives yellow ppt. of **lead chromate** when **lead acetate** is added.
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CENGAGE CHEMISTRY ENGLISH-QUALITATIVE INORGANIC SALT ANALYSIS-Exercises (Fill In The Blanks)
  1. Reagent used to test Ni^(2+) ion is (a).

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  2. Cr(OH)(3) is made soluble in NaOH in presence of (a) when (b) of(c ) ...

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  3. Fe(OH)(3) and Al(OH)(3) ppt. can be separated by (a) when (b) becomes ...

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  4. If orange turbidity appears on dilution with H(2)O of the solution ...

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  5. Copper sub-group ppt. and arsenic salt -group ppt. are sepeated using ...

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  6. PbCl(2) is soluble in (a) . AgCl is soluble in (b) white Hg(2)Cl(2) i...

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  7. Cd^(2+) and Cu^(2+) are seprated by (a) formation using (b) in which ...

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  8. Precipitation of Cd^(2+) and Cu^(2+) takes place in presence of (a)by ...

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  9. NH(4)Cl is added along with NH(4)OH in group (a)to (b) concentration o...

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  10. Separation of basic radicals is based on (a) and (b) .

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  11. Gas that turns lime water milky and aciddied K(2)Cr(2)O(7) green is...

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  12. NH(4)SCN gives red colour with (s) due to the formation of (b) .

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  13. HgCl(2) gives orange ppt , with (a) , which dissolves in excess of i...

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  14. Al(OH)(3) is precipitate if its produces (a)is (b) that K(sp)

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  15. PbSO(4) is soluble in (a) due to formation of (b) .

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  16. A reagent that can detect any of Cu^(2+),Fe^(3+),Zn^(2+) and Cd^(2+) i...

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  17. Fe^(2+) gives blue coloue, called(a) with (b)white Fe^(2+) gives blue ...

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  18. Ferric alum is the indicator in the titration of Ag^(o+) with SCN^(Θ)...

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  19. FeC(2)O(4) can decolorise acidified KMnO(4) due to the oxidation of (...

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  20. Acidified KMnO(4) can be decolourised by (a).

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