The minimum number of moles of
Question: The minimum number of moles of $\mathrm{O}_{2}$ required for complete combustion of 1 mole of propane and 2 moles of butane is Solution: $\underset{\text { 1mole }}{\mathrm{C}_{3} \mathrm{H}_{8}}+\underset{\text { 5mole }}{\mathrm{SO}_{2}} \rightarrow 3 \mathrm{Co}_{2}+4 \mathrm{H}_{2} \mathrm{O}$ For 1 mole propane combustion 5 mole $\mathrm{O}_{2}$ required $\mathrm{C}_{4} \mathrm{H}_{10}+\frac{13}{2} \mathrm{O}_{2} \rightarrow 4 \mathrm{Co}_{2}+5 \mathrm{H}_{2} \mathrm{O}$ $\begin{a...
Read More →The shortest wavelength of H atom is the Lyman series is lambda1.
Question: The shortest wavelength of $\mathrm{H}$ atom is the Lyman series is $\lambda_{1}$. The longest wavelength in the Balmer series of $\mathrm{He}^{+}$is :-$\frac{5 \lambda_{1}}{9}$$\frac{27 \lambda_{1}}{5}$$\frac{9 \lambda_{1}}{5}$$\frac{36 \lambda_{1}}{5}$Correct Option: , 3 Solution: As we know $\Delta \mathrm{E}=\frac{h \mathrm{c}}{\lambda}$ So $\quad \lambda=\frac{\mathrm{hc}}{\Delta \mathrm{E}}$ for $\lambda$ minimum i.e. shortest; $\Delta \mathrm{E}=$ maximum for Lyman series $\math...
Read More →an oxidation-reduction reaction in which 3
Question: an oxidation-reduction reaction in which 3 electrons are transferred has a $\Delta \mathrm{G}^{\circ}$ of $17.37 \mathrm{~kJ}$ $\mathrm{mol}^{-1}$ at $25^{\circ} \mathrm{C}$. The value of $\mathrm{E}_{\text {cell }}^{\circ}$ (in $\mathrm{V}$ ) is $\times 10^{-2}$ $\left(1 \mathrm{~F}=96,500 \mathrm{C} \mathrm{mol}^{-1}\right)$ Solution: $\Delta \mathrm{G}^{\circ}=-\mathrm{AFE}^{\circ}=-3 \times 96500 \times \mathrm{E}^{\circ}$ $\Rightarrow \mathrm{E}^{\circ}=-6 \times 10^{-2} \mathrm{~...
Read More →The major product [C] of the following reaction sequence will be :-
Question: The major product $[\mathrm{C}]$ of the following reaction sequence will be :- Correct Option: , 3 Solution:...
Read More →Solve this following
Question: A diatomic molecule $X_{2}$ has a body-centred cubic (bcc) structure with a cell edge of $300 \mathrm{pm}$. The density of the molecule is $6.17 \mathrm{~g} \mathrm{~cm}^{-3}$. The number of molecules present in $200 \mathrm{~g}$ of $\mathrm{X}_{2}$ is (Avogadro constant $\left(\mathrm{N}_{\mathrm{A}}\right)=6 \times 10^{23} \mathrm{~mol}^{-1}$ )$8 \mathrm{~N}_{\mathrm{A}}$$40 \mathrm{~N}_{\mathrm{A}}$$4 \mathrm{~N}_{\mathrm{A}}$$2 \mathrm{~N}_{\mathrm{A}}$Correct Option: 3, Solution: ...
Read More →The potential energy curve for the
Question: The potential energy curve for the $\mathrm{H}_{2}$ molecule as a function of internuclear distance is :Correct Option: , 2 Solution: Potential energy curve for $\mathrm{H}_{2}$ molecule is....
Read More →In the sixth period, the orbitals that are filled are
Question: In the sixth period, the orbitals that are filled are $6 \mathrm{~s}, 5 \mathrm{f}, 6 \mathrm{~d}, 6 \mathrm{p}$$6 \mathrm{~s}, 6 \mathrm{p}, 6 \mathrm{~d}, 6 \mathrm{f}$$6 \mathrm{~s}, 5 \mathrm{~d}, 5 \mathrm{f}, 6 \mathrm{p}$$6 \mathrm{~s}, 4 \mathrm{f}, 5 \mathrm{~d}, 6 \mathrm{p}$Correct Option: , 4 Solution: As per $(n+\ell)$ rule in $6^{\text {th }}$ period, order of orbitals filling is $6 \mathrm{~s}, 4 \mathrm{f}, 5 \mathrm{~d}, 6 \mathrm{p}$....
Read More →The condition that indicates a polluted environment is
Question: The condition that indicates a polluted environment is BOD value of 5 ppmeutrophication$0.03 \%$ of $\mathrm{CO}_{2}$ in the atmosphere$\mathrm{pH}$ of rain water to be $5.6$Correct Option: , 2 Solution: In Eutrophication nutrient enriched water bodies support a dense plant population, which kills animal life by depriving it of oxygen and results in subsequent loss of biodiversity. If indicates polluted environment....
Read More →The major product [B] in the following reactions is :-
Question: The major product $[\mathrm{B}]$ in the following reactions is :- Correct Option: , 4 Solution:...
Read More →The correct electronic configuration and spin-
Question: The correct electronic configuration and spinonly magnetic moment $(B M)$ of $G d^{3+}(Z=64)$, respectively, are$[\mathrm{Xe}] 5 \mathrm{f}^{7}$ and $8.9$$[\mathrm{Xe}] 4 \mathrm{f}^{7}$ and $7.9$$[\mathrm{Xe}] 5 \mathrm{f}^{7}$ and $7.9$$[\mathrm{Xe}] 4 \mathrm{f}^{7}$ and $8.9$Correct Option: , 2 Solution: Electronic configuration of $\mathrm{Gd}^{3+}$ is ${ }_{64} \mathrm{Gd}^{3+}=[\mathrm{Xe}] 4 \mathrm{f}^{7}$ $\mathrm{Gd}^{3+}$ having 7 unpaired electrons. Magnetic moment $(\mu)=...
Read More →250mL of a waste solution obtained from the workshop
Question: $250 \mathrm{~mL}$ of a waste solution obtained from the workshop of a goldsmith contains $0.1 \mathrm{M} \mathrm{AgNO}_{3}$ and $0.1 \mathrm{M} \mathrm{AuCl}$. The solution was electrolyzed at $2 \mathrm{~V}$ by passing a current of $1 \mathrm{~A}$ for 15 minutes. The metal/metals electrodeposited will be :- $\left(\mathrm{E}_{\mathrm{Ag}^{+} / \mathrm{Ag}}^{0}=0.80 \mathrm{~V}, \mathrm{E}_{\mathrm{Au}^{+} / \mathrm{Au}}^{0}=1.69 \mathrm{~V}\right)$only silveronly goldsilver and gold ...
Read More →If a person is suffering from the deficiency of nor-adrenaline, what kind of drug can be suggested ?
Question: If a person is suffering from the deficiency of nor-adrenaline, what kind of drug can be suggested ? Anti-inflammatoryAnalgesicAntihistamineAntidepressantCorrect Option: , 4 Solution: Anti depressant $\rightarrow$ drug which enhance the mood. Non adrenaline is neurotransmitter and its level is low in body due to some reason then person suffers from depression and in that situation anti depressant drug is required....
Read More →The incorrect statement(s) among (a) - (c) is (are) :-
Question: The incorrect statement(s) among (a) - (c) is (are) :- (a) W(VI) is more stable than $\mathrm{Cr}(\mathrm{VI})$. (b) in the presence of $\mathrm{HCl}$, permanganate titrations provide satisfactory results. (c) some lanthanoid oxides can be used as phosphors.(a) and (b) only(a) only(b) and (c) only(b) onlyCorrect Option: , 4 Solution: $\mathrm{KMnO}_{4}$ will not give satisfactory result when it is titrated by $\mathrm{HCl}$....
Read More →Identify the correct molecular picture showing that happens at the critical micellar concentration (CMC) of an aqueous solution of
Question: Identify the correct molecular picture showing that happens at the critical micellar concentration (CMC) of an aqueous solution of a surfactant (o polar head; \simnon-polar tail; - water). (b)(a)(d)(C)Correct Option: , 3 Solution:...
Read More →The major product [R] in the following sequence of reactions is :-
Question: The major product [R] in the following sequence of reactions is :- Correct Option: , 2 Solution: Now :- (i) $\mathrm{HgSO}_{4} / \mathrm{dil} . \mathrm{H}_{2} \mathrm{SO}_{4}$ (ii) $\mathrm{NaBH}_{4}$ is convert triple bond into ketone and formed ketone is reduced by $\mathrm{NaBH}_{4}$ and convert into Alcohol....
Read More →The increasing order of basicity of the following compounds is
Question: The increasing order of basicity of the following compounds is $(\mathrm{A})(\mathrm{B})(\mathrm{C})(\mathrm{D})$$(B)(A)(C)(D)$$(\mathrm{D})(\mathrm{A})(\mathrm{B})(\mathrm{C})$$(\mathrm{B})(\mathrm{A})(\mathrm{D})(\mathrm{C})$Correct Option: , 4 Solution:...
Read More →Among the following compounds,
Question: Among the following compounds, which one has the shortest $\mathrm{C}-\mathrm{Cl}$ bond ?Correct Option: , 3 Solution: In option (3) $\mathrm{C}-\mathrm{Cl}$ bond is shortest due to resonance of lone pair of $-\mathrm{Cl}$. Due to resonance $\mathrm{C}-\mathrm{Cl}$ bond acquire partial double bond character. Hence $\mathrm{C}-\mathrm{Cl}$ bond length is least....
Read More →A flask contains a mixture of compounds $A$ and B. Both compounds decompose by first-order
Question: A flask contains a mixture of compounds $\mathrm{A}$ and B. Both compounds decompose by first-order kinetics. The half-lives for $\mathrm{A}$ and $\mathrm{B}$ are $300 \mathrm{~s}$ and $180 \mathrm{~s}$, respectively. If the concentrations of $\mathrm{A}$ and $\mathrm{B}$ are equal initially, the time required for the concentration of $A$ to be four times that of $B($ in $s):($ Use $\ln 2=0.693)$180120300900Correct Option: , 4 Solution: $[\mathrm{A}]_{\mathrm{t}}=4[\mathrm{~B}]_{\mathr...
Read More →The molecule in which hybrid MOs involve only
Question: The molecule in which hybrid MOs involve only one d-orbital of the central atom is :-$\left[\mathrm{Ni}(\mathrm{CN})_{4}\right]^{2-}$$\left[\mathrm{CrF}_{6}\right]^{3-}$$\mathrm{BrF}_{5}$$\mathrm{XeF}_{4}$Correct Option: 1 Solution: $\left[\mathrm{Ni}(\mathrm{CN})_{4}\right]^{2-}$ dsp $^{2}$ hybridisation....
Read More →The difference between the radii of
Question: The difference between the radii of $3^{\text {rd }}$ and $4^{\text {th }}$ orbits of $\mathrm{Li}^{2+}$ is $\Delta \mathrm{R}_{1}$. The difference between the radii of $3^{\text {rd }}$ and $4^{\text {th }}$ orbits of $\mathrm{He}^{+}$is $\Delta \mathrm{R}_{2}$. Ratio $\Delta \mathrm{R}_{1}: \Delta \mathrm{R}_{2}$ is :$8: 3$$3: 2$$3: 8$$2: 3$Correct Option: , 4 Solution:...
Read More →Which of the following compounds will form the precipitate with aq.
Question: Which of the following compounds will form the precipitate with aq. $\mathrm{AgNO}_{3}$ solution most readily ?Correct Option: , 2 Solution: $\mathrm{R}-\mathrm{x}+\mathrm{aq} \cdot \mathrm{AgNO}_{3} \stackrel{\text { R.D. }}{\longrightarrow} \mathrm{R}^{\oplus}+\underset{(\mathrm{PPT})}{\mathrm{Agx}}$ So rate of P.P.T formation of $\mathrm{Agx}$ depend's on stability of carbocation $\left(\mathrm{R}^{+}\right)$ In given question formed carbocation will be Most stable carbocation is (b...
Read More →The most appropriate reagent for conversion of
Question: The most appropriate reagent for conversion of $\mathrm{C}_{2} \mathrm{H}_{5} \mathrm{CN}$ into $\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{NH}_{2}$ is :$\mathrm{Na}(\mathrm{CN}) \mathrm{BH}_{3}$$\mathrm{LiAlH}_{4}$$\mathrm{NaBH}_{4}$$\mathrm{CaH}_{2}$Correct Option: , 2 Solution: $\mathrm{CH}_{3}-\mathrm{CH}_{2}-\mathrm{C} \equiv \mathrm{N} \stackrel{?}{\longrightarrow} \mathrm{CH}_{3}-\mathrm{CH}_{2}-\mathrm{CH}_{2}-\mathrm{NH}_{2}$ $\mathrm{CH}_{3}-\mathrm{CH}_{2}-\math...
Read More →Solve this following
Question: The structure of $\mathrm{PCl}_{5}$ in the solid state issquare pyramidaltetrahedral $\left[\mathrm{PCl}_{4}\right]^{+}$and octahedral $\left[\mathrm{PCl}_{6}\right]^{-}$square planar $\left[\mathrm{PCl}_{4}\right]^{+}$and octahedral $\left[\mathrm{PCl}_{6}\right]^{-}$trigonal bipyramidalCorrect Option: , 2 Solution: $\mathrm{PCl}_{5(\mathrm{~s})}$ exist as $\left[\mathrm{PCl}_{4}\right]^{+}$and $\left[\mathrm{PCl}_{6}\right]^{-}$...
Read More →Which of the following derivatives of alcohols is unstable in an aqueous base ?
Question: Which of the following derivatives of alcohols is unstable in an aqueous base ? Correct Option: , 2 Solution: It is a hydrolysis of ester in basic medium....
Read More →An Ellingham diagram provides information about :
Question: An Ellingham diagram provides information about :the pressure dependence of the standard electrode potentials of reduction reactions involved in the extraction of metals.the kinetics of the reduction process.the temperature dependence of the standard Gibbs energies of formation of some metal oxides.the conditions of $\mathrm{pH}$ and potential under which a species is thermodynamically stable.Correct Option: , 4 Solution: Ellingham diagram provides information about temperature depende...
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