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Theory

Self Evaluation

Procedure

Simulation

Assignment

References

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Gravimetric Estimation of Nickel

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Which reagent is used to selectively precipitate nickel in gravimetric estimation?

a: Oxalic acid Explanation

Explanation

b: Dimethyl glyoxime Explanation

Explanation

c: EDTA Explanation

Explanation

d: Ammonium oxalate Explanation

Explanation

What is the role of ammonia in the gravimetric estimation of nickel?

a: To dissolve the nickel complex Explanation

Explanation

b: To adjust the temperature Explanation

Explanation

c: To maintain the pH for chelation Explanation

Explanation

d: To oxidize nickel ions Explanation

Explanation

Why is it important to avoid adding a large excess of dimethyl glyoxime in this experiment?

a: It forms complexes with water molecules Explanation

Explanation

b: It may lead to precipitation of DMG itself Explanation

Explanation

c: It causes the nickel complex to evaporate Explanation

Explanation

d: It reduces the solubility of the nickel complex Explanation

Explanation

In gravimetric analysis, which of the following is NOT a fundamental step?

a: Precipitation Explanation

Explanation

b: Chromatographic separation Explanation

Explanation

c: Filtration Explanation

Explanation

d: Ignition and weighing Explanation

Explanation

Which of the following conditions favors the formation of a pure and filterable nickel-dimethylglyoxime precipitate?

a: Rapid addition of the reagent without stirring Explanation

Explanation

b: Cold solution at pH below 5 Explanation

Explanation

c: Slow addition of reagent with heating and stirring Explanation

Explanation

d: Strong acidic medium with vigorous shaking Explanation

Explanation

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