MCQ
Which of the following does not uses formaldehyde in its preparation?
- AMelamine polymer
- BBakelite
- CPHBV
- DPreservation of biological specimens.
✓
Answer
- PHBV
Explanation:
Formaldehyde is not used in the preparation of PHBV. PHBV is a thermoplastic polymer. The monomers, 3-hydroxybutanoic acid and 3-hydroxypentanoic acid, are joined by ester bonds; the back bone of the polymer is made up of carbon and oxygen atoms.
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
Consider the cell given below
→→$Ag\left( s \right)/A{g^ \oplus }||C{u^{2 + }}/Cu\left( s \right)$
$A{g^ \oplus } + {e^ - } \to Ag\,;\,{E^o} = x$
$C{u^{2 + }} + 2{e^ - } \to Cu\,;\,{E^o} = y$
$E^o_{cell}$ is
Time required for completion of $99.9 \%$ of a First order reaction is_________ times of half life $\left(\mathrm{t}_{1 / 2}\right)$ of the reaction.
→Number of compounds from the following which will not produce orange red precipitate with Benedict solution is $..............$. Glucose, maltose, sucrose, ribose,$2-$deoxyribose, amylose, lactose.
→The reaction of zinc with dilute and concentrated nitric acid, respectively, produces :
Which of the following give hofmann's degradation reaction
Given below are two statements:
→Statement$-I$ $: \alpha$ and $\beta$ forms of sulphur can change reversibly between themselves with slow heating or slow cooling.
Statement$-II :$ At room temperature the stable crystalline form of sulphur is monoclinic sulphur.
In the light of the above statements, choose the correct answer from the options given below:
Primary alcohols on dehydration give
Which of the following is a true acidic anhydride
In which of the following compounds, the transition metal is in oxidation state of zero ?