The presence or absence of hydroxy group on which carbon atom of sugar differentiates RNA and DNA?
Question: The presence or absence of hydroxy group on which carbon atom of sugar differentiates RNA and DNA? $3^{\text {rd }}$$4^{\text {th }}$$1^{\mathrm{st}}$$2^{\mathrm{nd}}$Correct Option: , 4 Solution: Solution not required...
Read More →Which of the following polymers is synthesized
Question: Which of the following polymers is synthesized using a free radical polymerization technique ?TeryleneTeflonNylon 6,6Melamine polymerCorrect Option: , 2 Solution: Solution not required...
Read More →Biurest test is not given by :-
Question: Biurest test is not given by :- proteinscarbohydratespolypeptidesureaCorrect Option: , 2 Solution: Solution not required...
Read More →Assertion : Rayon is a semisynthetic polymer
Question: Assertion : Rayon is a semisynthetic polymer whose properties are better than natural cotton. Reason : Mechanical and aesthetic properties of cellulose can be improved by acetylation.Both assertion and reason are incorrectAssertion is incorrect statement, but the reason is correctBoth assertion and reason are correct, but the reason is not the correct explanation for the assertionBoth assertion and reason are correct, and the reason is the correct explanation for the assertionCorrect O...
Read More →The two functional groups present in a typical carbohydrate are :-
Question: The two functional groups present in a typical carbohydrate are :- $\mathrm{C}=\mathrm{O}$ and $-\mathrm{OH}$$-\mathrm{OH}$ and $-\mathrm{CHO}$$-\mathrm{OH}$ and $-\mathrm{COOH}$$-\mathrm{CHO}$ and $-\mathrm{COOH}$Correct Option: , 2 Solution: Solution not required...
Read More →Which of the following statements
Question: Which of the following statements about low density polythene is FALSE ?It is used in the manufacture of buckets, dust-bins etc.Its synthesis requires high pressureIt is a poor conductor of electricityIts synthesis requires dioxygen or a peroxide initiator as a catalyst.Correct Option: 1 Solution:...
Read More →Which polymer is used in the manufacture of paints and lacquers ?
Question: Which polymer is used in the manufacture of paints and lacquers ?PolypropenePoly vinyl chlorideBakeliteGlyptalCorrect Option: , 4 Solution:...
Read More →The recommended concentration of fluoride ion in drinking water
Question: The recommended concentration of fluoride ion in drinking water is up to 1 ppm as fluoride ion is required to make teeth enamel harder by converting $\left[3 \mathrm{Ca}_{3}\left(\mathrm{PO}_{4}\right)_{2} \cdot \mathrm{Ca}(\mathrm{OH})_{2}\right]$ to :$\left[3\left(\mathrm{CaF}_{2}\right) \cdot \mathrm{Ca}(\mathrm{OH})_{2}\right]$$\left[3\left(\mathrm{Ca}_{3}\left(\mathrm{PO}_{4}\right)_{2} \cdot \mathrm{CaF}_{2}\right]\right.$$\left[3\left(\mathrm{Ca}(\mathrm{OH})_{2}\right] \cdot \m...
Read More →Which one of the following structures represents
Question: Which one of the following structures represents the neoprene polymer :-Correct Option: , 3 Solution:...
Read More →Solve this following
Question: $29.5 \mathrm{mg}$ of an organic compound containing nitrogen was digested according to Kjeldahl's method and the evolved ammonia was absorbed in $20 \mathrm{~mL}$ of $0.1 \mathrm{M} \mathrm{HCl}$ solution. The excess of the acid required 15 $\mathrm{mL}$ of $0.1 \mathrm{M} \mathrm{NaOH}$ solution for complete neutralization. The percentage of nitrogen in the compound is$29.5$$59.0$$47.4$$23.7$Correct Option: , 4 Solution:...
Read More →Which one is classified as a condensation polymer?
Question: Which one is classified as a condensation polymer?TeflonAcrylonitrileDacronNeopreneCorrect Option: , 3 Solution:...
Read More →The species which can best serve as an initiator
Question: The species which can best serve as an initiator for the cationic polymerization is :-BuLi$\mathrm{LiAlH}_{4}$$\mathrm{HNO}_{3}$$\mathrm{AlCl}_{3}$Correct Option: , 4 Solution: Electron - deficient species (Lawis acid) like $\mathrm{AlCl}_{3}, \mathrm{BF}_{3}$ etc. are is used as initiator for cationic polymerisation....
Read More →Thermosetting polymer,
Question: Thermosetting polymer, Bakelite is formed by the reaction of phenol with :-$\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CHO}$$\mathrm{CH}_{3} \mathrm{CHO}$$\mathrm{HCHO}$$\mathrm{HCOOH}$Correct Option: , 3 Solution: Bakelite is a thermosetting polymer formed by the condensation reaction of phenol with $\mathrm{HCHO}$ in the presense of conc. $\mathrm{H}_{2} \mathrm{SO}_{4}$ It is thus, a cross-linked polymer in which condesation takes place at O- and p- positions So HCHO is the corerect op...
Read More →The polymer containing strong intermolecular forces e.g.
Question: The polymer containing strong intermolecular forces e.g. hydrogen bonding, is :-natural rubberteflonnylon 6,6polystyreneCorrect Option: , 3 Solution: Solution not required...
Read More →Buna–N synthetic rubber is a copolymer of :-
Question: BunaN synthetic rubber is a copolymer of :-$\mathrm{H}_{2} \mathrm{C}=\mathrm{CH}-\mathrm{CN}$ and $\mathrm{H}_{2} \mathrm{C}=\mathrm{CH}-\mathrm{CH}=\mathrm{CH}_{2}$$\mathrm{H}_{2} \mathrm{C}=\mathrm{CH}-\mathrm{CH}=\mathrm{CH}_{2}$ and $\mathrm{H}_{5} \mathrm{C}_{6}-\mathrm{CH}=\mathrm{CH}_{2}$Correct Option: 1 Solution: Buna- $\mathrm{N}$ is actually abbrebiated form, where Bu represents 1,3 -butadiene, Na represents sodium and $\mathrm{N}$ represents nitrile (acrylonitrile). Thus, ...
Read More →The predominant form of histamine present in human blood is
Question: The predominant form of histamine present in human blood is ( $\mathrm{pK}_{\mathrm{a}}$, Histidine $=6.0$ ) Correct Option: , 3 Solution:...
Read More →The radius of the second Bohr orbit for hydrogen atom is :
Question: The radius of the second Bohr orbit for hydrogen atom is : (Plank's const. $\mathrm{h}=6.6262 \times 10^{-34} \mathrm{Js}$; mass of electron $=9.1091 \times 10^{-31} \mathrm{~kg}$; charge of electron $\mathrm{e}=$ $1.60210 \times 10^{-19} \mathrm{C}$; permittivity of vaccum $\left.\epsilon_{0}=8.854185 \times 10^{-12} \mathrm{~kg}^{-1} \mathrm{~m}^{-3} \mathrm{~A}^{2}\right)$1.65 A4.76 A0.529 A212 ACorrect Option: 4, Solution:...
Read More →A stream of electrons from a heated filament was passed
Question: A stream of electrons from a heated filament was passed between two charged plates kept at a potential difference $\mathrm{V}$ esu. If $\mathrm{e}$ and $\mathrm{m}$ are charge and mass of an electron respectively, then the value of $\mathrm{h} / \lambda$ (where $\lambda$ is wavelength associated with electron wave) is given by :$\sqrt{2 \mathrm{meV}}$$\mathrm{meV}$$2 \mathrm{meV}$$\sqrt{\mathrm{meV}}$Correct Option: 1 Solution: $\therefore \frac{\mathrm{h}}{\lambda}=\sqrt{2 \mathrm{meV...
Read More →Which of the following is the energy of a possible excited
Question: Which of the following is the energy of a possible excited state of hydrogen?$-3.4 \mathrm{eV}$$+6.8 \mathrm{eV}$$\quad+13.6 \mathrm{eV}$$-6.8 \mathrm{eV}$Correct Option: 1 Solution:...
Read More →Ionization energy of gaseous
Question: Ionization energy of gaseous $\mathrm{Na}$ atoms is $495.5 \mathrm{kjmol}^{-1}$. The lowest possible frequency of light that ionizes a sodium atom is $\left(\mathrm{h}=6.626 \times 10^{-34} \mathrm{Js}, \mathrm{N}_{\mathrm{A}}=6.022 \times 10^{23} \mathrm{~mol}^{-1}\right)$$3.15 \times 10^{15} \mathrm{~s}^{-1}$$4.76 \times 10^{14} \mathrm{~s}^{-1}$$1.24 \times 10^{15} \mathrm{~s}^{-1}$$7.50 \times 10^{4} \mathrm{~s}^{-1}$Correct Option: , 3 Solution:...
Read More →The distillation technique most suited for separating glycerol from spent-lye in the soap industry is:
Question: The distillation technique most suited for separating glycerol from spent-lye in the soap industry is:Distillation under reduced pressureSimple distillationFractional distillationSteam distillationCorrect Option: 1 Solution:...
Read More →If lambda_0 and lambda be the threshold wavelength and wavelength of incident light,
Question: If $\lambda_{0}$ and $\lambda$ be the threshold wavelength and wavelength of incident light, the velocity of photoelectron ejected from the metal surface is :$\sqrt{\frac{2 \mathrm{hc}}{\mathrm{m}}\left(\frac{\lambda_{0}-\lambda}{\lambda \lambda_{0}}\right)}$$\sqrt{\frac{2 \mathrm{~h}}{\mathrm{~m}}\left(\frac{1}{\lambda_{0}}-\frac{1}{\lambda}\right)}$$\sqrt{\frac{2 \mathrm{~h}}{\mathrm{~m}}\left(\lambda_{0}-\lambda\right)}$$\sqrt{\frac{2 h \mathrm{c}}{\mathrm{m}}\left(\lambda_{0}-\lamb...
Read More →Based on the equation
Question: Based on the equation $\Delta \mathrm{E}=-2.0 \times 10^{-18} \mathrm{~J}\left(\frac{1}{\mathrm{n}_{2}^{2}}-\frac{1}{\mathrm{n}_{1}^{2}}\right)$ the wavelength of the light that must be absorbed to excite hydrogen electron from level $\mathrm{n}=$ 1 to level $\mathrm{n}=2$ will be $\left(\mathrm{h}=6.625 \times 10^{-34} \mathrm{Js}, \mathrm{C}=3 \times 10^{8} \mathrm{~ms}^{-1}\right)$$2.650 \times 10^{-7} \mathrm{~m}$$1.325 \times 10^{-7} \mathrm{~m}$$1.325 \times 10^{-10} \mathrm{~m}$...
Read More →Thiol group is present in :-
Question: Thiol group is present in :- MethionineCytosineCystineCysteineCorrect Option: , 4 Solution:...
Read More →If the binding energy of the electron in a hydrogen atom is
Question: If the binding energy of the electron in a hydrogen atom is $13.6 \mathrm{eV}$, the energy required to remove the electron from the first excited state of $\mathrm{Li}^{++}$is :$13.6 \mathrm{eV}$$30.6 \mathrm{eV}$$122.4 \mathrm{eV}$$3.4 \mathrm{eV}$Correct Option: , 2 Solution: B.E. = 3.4 9 = 30.6 eV...
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