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The electrons identified by quantum numbers $$n$$ and $$l$$, (i) $$n=4, l=1$$, (ii) $$n=4, l=0$$, (iii) $$n=3, l=2$$, (iv) $$n=3, l=1$$ can be placed in order of increasing energy from lowest to highest as
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The electrons identified by quantum numbers $$n$$ and $$l$$, (i) $$n=4, l=1$$, (ii) $$n=4, l=0$$, (iii) $$n=3, l=2$$, (iv) $$n=3, l=1$$ can be placed in order of increasing energy from lowest to highest as
Spodoptol, a sex attractant, produced by a female fall armyworm moth, can be prepared as follows. The structure of Spodoptol is (pKa: terminal alkynes about 25, alcohols about 17)
Passing $$\mathrm{H_2S}$$ gas into a mixture of $$\mathrm{Mn^{2+}}$$, $$\mathrm{Ni^{2+}}$$, $$\mathrm{Cu^{2+}}$$ and $$\mathrm{Hg^{2+}}$$ in an acidified aqueous solution precipitates
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Battery acid $$\mathrm{H_2SO_4}$$ has density $$1.285\ \mathrm{g\,cm^{-3}}$$. $$10.0\ \mathrm{cm^3}$$ of this acid is diluted to $$1\ \mathrm{L}$$. $$25.0\ \mathrm{cm^3}$$ of this diluted solution requires $$25.0\ \mathrm{cm^3}$$ of $$0.1\ \mathrm N$$ sodium hydroxide solution for neutralization. The percentage of sulphuric acid by mass in the battery acid is
The compound that reacts fastest with methylamine is
$$\mathrm{HgO}$$ is prepared by two different methods, one showing yellow colour and the other showing red colour. The difference in colour is due to difference in
The pH of a $$1.0 imes10^{-3}\ \mathrm{mol\,L^{-1}}$$ solution of a weak acid $$\mathrm{HA}$$ is $$3.60$$. The dissociation constant of the acid is
The best sequence of reactions for preparation of the following compound from benzene is
Which reaction is spontaneous at all temperatures at standard pressure and concentration?
The IUPAC name of the following compound is
$$\mathrm{NaOH}$$ solution is added dropwise to $$\mathrm{HCl}$$ solution and the conductance of the mixture is measured after addition of each drop. The variation of conductance with volume of $$\mathrm{NaOH}$$ added is as shown in the adjacent graph.
The statement that is not true for the above is
A colorless water-soluble compound on strong heating liberates a brown coloured gas and leaves a yellow residue that turns white on cooling. An aqueous solution of the original solid gives a white precipitate with $$(\mathrm{NH_4})_2\mathrm S$$. The original solid is
The following compounds are heated, (i) $$\mathrm{KNO_3}$$, (ii) $$\mathrm{Cu(NO_3)_2}$$, (iii) $$\mathrm{Pb(NO_3)_2}$$, (iv) $$\mathrm{NH_4NO_3}$$. Which of the following statements is correct?
The diastereoisomer, meaning a stereoisomer that is not a mirror image, of X is
Given $$\Delta_rH^\circ=-54.08\ \mathrm{kJ\,mol^{-1}}$$ and $$\Delta_rS^\circ=10.0\ \mathrm{J\,mol^{-1}K^{-1}}$$ at $$25^\circ\mathrm C$$, the value of $$\log_{10}K$$ for the reaction $$A \rightleftharpoons B$$ is
Which of the complexes has the magnetic moment of $$3.87\ \mathrm{B.M.}$$?
Compound X in the following reaction is
A toxic element is to be removed from drinking water by adsorption on activated charcoal. At low concentrations, the rate constant for adsorption is $$1.8 \times10^{-5}\ \mathrm{s^{-1}}$$. The time required to reduce the concentration of the toxic element to $$10\%$$ of its initial concentration is
Assuming that Hund's rule is violated by the diatomic molecule $$\mathrm{B_2}$$, its bond order and magnetic nature will be respectively
In a cubic crystal structure, divalent metal ion is located at the body-centered position, smaller tetravalent metal ions are located at each corner and $$\mathrm{O^{2-}}$$ ions are located halfway along each edge of the cube. The number of nearest neighbors for oxygen is
Organic compounds sometimes adjust their electronic as well as steric structures to attain stability. Among the following, the compound having highest dipole moment is
Cyanide ion is a very good complexing agent and also functions as a reducing agent. Addition of an aqueous solution of $$\mathrm{KCN}$$ to a solution of copper sulfate yields a white precipitate which is soluble in excess aqueous $$\mathrm{KCN}$$ to form the complex
When a certain metal was irradiated with light of frequency $$3.2 \times10^{16}\ \mathrm{Hz}$$, the photoelectrons emitted had twice the kinetic energy as those emitted when the same metal was irradiated with light of frequency $$2.0 \times10^{16}\ \mathrm{Hz}$$. The threshold frequency $$v_0$$ of the metal is
The major product S of the following reaction sequence is
$$1.250\ \mathrm g$$ of metal carbonate $$\mathrm{MCO_3}$$ was treated with $$500\ \mathrm{mL}$$ of $$0.1\ \mathrm M$$ $$\mathrm{HCl}$$ solution. The unreacted $$\mathrm{HCl}$$ required $$50.0\ \mathrm{mL}$$ of $$0.500\ \mathrm M$$ $$\mathrm{NaOH}$$ solution for neutralization. Identify the metal M
An electron beam can undergo diffraction by crystals, proving the wave nature of electrons. The potential required for a beam of electrons to be accelerated so that its wavelength becomes equal to $$0.154\ \mathrm{nm}$$ is
A biodegradable alternating copolymer of L-alanine and glycolic acid $$\mathrm{HOCH_2COOH}$$ is
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In which of the following complexes does the metal ion have the lowest ionic radius?
In cold climate, water in a car radiator freezes and causes damage. Ethylene glycol is used as an antifreezing agent. The amount of ethylene glycol that should be added to $$5\ \mathrm{kg}$$ of water to prevent freezing at $$-7^\circ\mathrm C$$ is, given $$K_f=1.86\ \mathrm{K\,kg\,mol^{-1}}$$ and molar mass of ethylene glycol $$62\ \mathrm{g\,mol^{-1}}$$
The ratio of the energy of the electron in the ground state of hydrogen atom to that of the electron in the first excited state of $$\mathrm{Be^{3+}}$$ is
A water-insoluble but organic-solvent-soluble dye is dissolved in three organic solvents and taken in three separating funnels a, b and c. Water is added, the funnels are shaken, and allowed to stand. The solvents in separating funnels a, b and c are respectively
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P, Q, R and S are four metals with the following reactions. Only Q and R react with dilute hydrochloric acid to give hydrogen. When Q is added to a solution containing ions of the other metals, metallic P, R and S are formed. P reacts with concentrated nitric acid but S does not. The correct order of their reducing character is
The kinetic energy of an electron that has a wavelength of $$10\ \mathrm{nm}$$ is
Which of the following compounds contain three-centered two-electron bonding, (i) $$[\mathrm{BeF_2}]_n$$, (ii) $$[\mathrm{Be(CH_3)_3}]_n$$, (iii) $$[\mathrm{BeCl_2}]_n$$, (iv) $$[\mathrm{BeH_2}]_n$$
3-Methylpentane on monochlorination gives four possible products. The reaction follows a free radical mechanism. The relative reactivities for replacement of hydrogen are $$3^\circ\colon2^\circ\colon1^\circ=6\colon4\colon1$$. Relative amounts of A, B, C and D formed are
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White phosphorus on reaction with $$\mathrm{NaOH}$$ gives $$\mathrm{PH_3}$$ and
Given the standard reduction potentials $$\mathrm{Sn^{4+}+2e^-
ightarrow Sn^{2+}}$$, $$0.15\ \mathrm V$$, $$\mathrm{Hg_2^{2+}+2e^-
ightarrow2Hg}$$, $$0.92\ \mathrm V$$, and $$\mathrm{PbO_2+4H^++2e^-
ightarrow Pb^{2+}+2H_2O}$$, $$1.45\ \mathrm V$$, which statement is true?
For the conversion $$\mathrm{CCl_4(l)
ightarrow CCl_4(g)}$$ at $$1\ \mathrm{bar}$$ and $$350\ \mathrm K$$, the correct set of thermodynamic parameters is, given boiling point of $$\mathrm{CCl_4}$$ is $$77^\circ\mathrm C$$
How many isomers are possible for complex $$[\mathrm{Co(ox)_2Cl_2}]^+$$?
The compound that will not react with silver perchlorate under normal conditions is
The conductivity of $$0.10\ \mathrm M$$ potassium chloride solution at $$298\ \mathrm K$$ is $$1.29 imes10^{-2}\ \mathrm{S\,cm^{-1}}$$. Its resistance is $$28.44\ \Omega$$. Using the same cell, the resistance of $$0.10\ \mathrm M$$ ammonium chloride solution is $$28.50\ \Omega$$. The molar conductivity of ammonium chloride solution in $$\mathrm{S\,cm^2\,mol^{-1}}$$ is
Consider a compound $$\mathrm{CsXY_2}$$ where X and Y are halogens. Which statements are correct, (i) X and Y have different oxidation states, (ii) for Y with lower atomic number than X, X can assume oxidation states higher than normal, (iii) such compounds exist because $$\mathrm{Cs^+}$$ has a high charge to size ratio.
Match the compounds given in list I with their characteristic reactions in list II
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Which of the following statements is not correct regarding galvanic cells?
L-Fucose with the following planar representation is a sugar component of the determinants of the A, B and O blood groups. The open-chain structure of L-Fucose can be represented as
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In ammonia the bond angle is $$107^\circ48'$$ while in $$\mathrm{SbH_3}$$ the bond angle is about $$91^\circ18'$$. The correct explanation is
Equal masses of ethane and hydrogen gas are present in a container at $$25^\circ\mathrm C$$. The fraction of the total pressure exerted by ethane gas is
The volume of nitrogen evolved on complete reaction of $$9\ \mathrm g$$ of ethylamine with a mixture of $$\mathrm{NaNO_2}$$ and $$\mathrm{HCl}$$ at $$273^\circ\mathrm C$$ and $$1\ \mathrm{atm}$$ pressure is
If a dilute solution of aqueous $$\mathrm{NH_3}$$ is saturated with $$\mathrm{H_2S}$$, then the product formed is
Three Faradays of electricity are passed through aqueous solutions of $$\mathrm{AgNO_3}$$, $$\mathrm{NiSO_4}$$ and $$\mathrm{CrCl_3}$$ in three vessels using inert electrodes. The ratio in moles in which Ag, Ni and Cr are deposited is
Nepetalactone X is isolated as an oil from Catnip. The number of chiral carbon atoms and the amount of KOH consumed by $$83\ \mathrm{mg}$$ of Nepetalactone are respectively
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Number of P-S single bonds and P-S double bonds in $$\mathrm{P_4S_{10}}$$ are respectively
If the solubility product of iron(III) hydroxide is $$1.8 imes10^{-37}$$, the pH of a saturated solution of iron(III) hydroxide in distilled water is close to
An alkyl halide X on reaction with ethanolic sodium hydroxide forms an alkene Y which on further reaction with HBr gives the same alkyl halide. The alkene Y on reaction with HBr and peroxide followed by reaction with Mg metal and then HCN produces an aldehyde Z. Z is
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$$\mathrm{HClO_4}$$ is a stronger acid than $$\mathrm{HClO}$$. The correct statement is
For an elementary rearrangement reaction $$\mathrm{A
ightleftharpoons P}$$, the following data were recorded at $$303\ \mathrm K$$ when $$[\mathrm P]_0=0$$. If the equilibrium constant is $$1.12$$ at $$303\ \mathrm K$$, the rate constant for the reaction $$\mathrm{P
ightarrow A}$$ is
Compound P on treatment with $$\mathrm{CH_2N_2}$$ produces compound Q. Compound Q on reaction with HI produces two alkyl iodides R and S. Alkyl iodide S with the higher number of carbon atoms on reaction with KCN followed by hydrolysis gives 3-methylbutanoic acid. Compound P is
$$\mathrm{I_2}$$ reacts with aqueous $$\mathrm{Na_2S_2O_3}$$ to give $$\mathrm{Na_2S_4O_6}$$ and $$\mathrm{NaI}$$. The products of reaction of $$\mathrm{Cl_2}$$ with aqueous $$\mathrm{Na_2S_2O_3}$$ are
The standard potentials of the $$\mathrm{MnO_4^-/Mn^{2+}}$$ and $$\mathrm{MnO_2/Mn^{2+}}$$ half cells in acidic medium are $$1.51\ \mathrm V$$ and $$1.23\ \mathrm V$$ respectively at $$298\ \mathrm K$$. The standard potential of the $$\mathrm{MnO_4^-/MnO_2}$$ half-cell in acidic medium at the same temperature is
Aspartame X is an artificial sweetening agent and is 200 times sweeter than sugar. It is an ester of the dipeptide of
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Which one of the following reactions is correct?
Standard molar enthalpy of formation of $$\mathrm{CO_2(g)}$$ is equal to
The reaction of 1-phenylpropane with limited amount of chlorine in the presence of light gives mainly
An ionic solid $$\mathrm{LaI_2}$$ shows electrical conduction due to presence of
For a gaseous reaction $$\mathrm{A+B
ightarrow Products}$$, the energy of activation was found to be $$2.27\ \mathrm{kJ\,mol^{-1}}$$ at $$273\ \mathrm K$$. The ratio of the rate constant $$k$$ to the frequency factor $$A$$ at $$273\ \mathrm K$$ is
In the case of dibromo derivatives of the following compound, the derivative having highest energy has the bromo substituents in positions
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The ionization energy of a certain element is $$412\ \mathrm{kJ\,mol^{-1}}$$. When the atoms are in the first excited state, the ionization energy is only $$126\ \mathrm{kJ\,mol^{-1}}$$. The region of the electromagnetic spectrum in which the wavelength of light emitted in a transition from the first excited state to the ground state is
The reaction of an olefin with $$\mathrm{HBr}$$ can proceed by ionic as well as radical mechanism. The reaction in the presence of light takes place by radical mechanism, as
The correct statement or statements are, I. Soap is excellent for cleaning, 100% broken down by bacteria in rivers and hence has no further environmental damaging repercussions. II. Soap forms an insoluble precipitate or scum when hard water containing calcium and magnesium ions is used. III. Soaps can be used for cleansing under acidic solutions.
The kinetic data recorded at $$278\ \mathrm K$$ for the reaction $$\mathrm{NH_4^+(aq)+NO_2^-(aq)
ightarrow N_2(g)+2H_2O(l)}$$ are shown in the table. The kinetic rate expression and the unit of rate constant are respectively
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Which of the following statements is not true for $$\mathrm{Ce^{3+}}$$ and $$\mathrm{Yb^{3+}}$$?
Complete catalytic hydrogenation of naphthalene gives decalin $$\mathrm{C_{10}H_{18}}$$. The number of isomers of decalin formed and the total number of isomers of decalin possible are respectively
The mass of argon adsorbed per unit mass of carbon surface is plotted against pressure. Which of the following plots is correct if $$x$$ and $$m$$ represent the masses of argon and carbon respectively?
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In a process, n-propyl chloride is reacted with sodium butanoate in an aqueous medium. After the reaction diethyl ether is added and the solution is shaken. The two layers are separated. The incorrect statement with respect to this procedure is
Which of the following statements about ammonium cerium(IV) nitrate, $$(\mathrm{NH_4})_2[\mathrm{Ce(NO_3)_6}]$$, is false?
The correct order of the magnitude of bond energy of the central C-C bond in the following compounds is (i) $$\mathrm{CH_2=CH-CH=CH_2}$$, (j) $$\mathrm{Me_3C-CPh_3}$$, (k) $$\mathrm{MeCO-CO-Me}$$, (l) $$\mathrm{CH\equiv C-C\equiv CH}$$
Which one of the following information about the compounds is correct?
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The best method of preparation of 2-benzyloxynaphthalene is a base-catalysed reaction of
The pair that is isostructural, meaning having the same shape and hybridization, is
A group which departs from the substrate in a nucleophilic substitution reaction is called a leaving group. The ease of departure is determined by the acidity of the conjugate acid of the leaving group; higher the acidity, better the leaving group. The correct order of reactivity of the following compounds in a given nucleophilic reaction is
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