MCQ
Fluorescein is an example of
- Aazo dyes
- ✓phthalein dyes
- Ctriphenylmethane dyes
- Dnitro dyes
✓
Answer
Correct option: B.
phthalein dyes
b
Fluorescein also called resorcinolphthalein is an example of phthalein dye. It is prepared by heating phthalic anhydride and resorcinol over a zinc catalyst, and it crystallizes as a deep red powder.
Fluorescein also called resorcinolphthalein is an example of phthalein dye. It is prepared by heating phthalic anhydride and resorcinol over a zinc catalyst, and it crystallizes as a deep red powder.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
Complete hydrolysis of cellulose gives
The product($s$) of the following reaction sequence is(are)
→$\alpha -D-$ Glucose and $\beta -D-$ Glucose are not
→Cresol is
The total number of unpaired electrons present in $\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{6}\right] \mathrm{Cl}_{2}$ and $\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{6}\right] \mathrm{Cl}_{3}$ is $......$
→Major product of the following reaction is.
What is electronic arrangement of metal atom/ion in octahedral complex with $d^4$ configuration, If ${\Delta _0} < $ pairing energy
→The commercial uses of $DDT$ and benzene hexachloride are
→The reagent used for the preparation of higher ether from halogenated ethers is
Given below are two statements, one is labelled as Assertion $A$ and the other is labelled as Reason $R$.
→Assertion $A$ : $\left[ CoCl \left( NH _3\right)_5\right]^{2+}$ absorbs at lower wavelength of light with respect to $\left[ Co \left( NH _3\right)_5\left( H _2 O \right)\right]^{3+}$
Reason $R$ : It is because the wavelength of the light absorbed depends on the oxidation state of the metal ion.
In the light of the above statements, choose the correct answer from the options given below :