Virtual Labs

Chemical Sciences Virtual Chemistry Lab Experiments

Aim

Theory

Pretest

Procedure

Simulation

Posttest

References

Feedback

Aim

Theory

Pretest

Procedure

Simulation

Posttest

References

Feedback

Estimation of Embelin content in Embelia ribes (kali mirch) and Tamarind

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Beginner

Intermediate

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1. Rf value is less than one because-

a: Distance covered by the solute is more than solvent front Explanation

Explanation

b: Distance covered by solvent front is more than distance covered by solute Explanation

Explanation

c: Both of them Explanation

Explanation

d: None of them Explanation

Explanation

2. Rf value is close to 1, then what happens?

a: Good Separation occurs Explanation

Explanation

b: No Separation occurs Explanation

Explanation

c: Separation does not depend on Rf Explanation

Explanation

d: None of them Explanation

Explanation

3. Rf value is affected by-

a: Polarity of solvent Explanation

Explanation

b: Saturation period of chamber Explanation

Explanation

c: pH of the solution Explanation

Explanation

d: All of the above Explanation

Explanation

4. If TLC spots are too high, i.e., too near the solvent front then what can I do now?

a: Increase the polarity of solvent Explanation

Explanation

b: Decrease the polarity of solvent Explanation

Explanation

c: Increase the plate size Explanation

Explanation

d: All above Explanation

Explanation

5. Do impurities affect the Rf values?

a: Yes, always Explanation

Explanation

b: Yes, sometimes Explanation

Explanation

c: No Explanation

Explanation

d: None Explanation

Explanation

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