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The following qualitative plots depict the first, second and third ionization energies (I.E.) of Mg, Al and K. Among the following, the correct match of I.E. and the metal is
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The following qualitative plots depict the first, second and third ionization energies (I.E.) of Mg, Al and K. Among the following, the correct match of I.E. and the metal is
A solid comprises of three types of elements, P, Q and R. P forms an FCC lattice in which Q and R occupy all the tetrahedral voids and half the octahedral voids respectively. The molecular formula of the solid is
The set in which all the species are diamagnetic is
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The structure of compound X ($$\text{C}_8\text{H}_{11}\text{NO}$$) based on the following tests and observations is
Reaction of $$\text{C}_6\text{H}_5\text{MgBr}$$ with phenol gives
The work done (kJ) in the irreversible isothermal compression of 2.0 moles of an ideal gas from 1 bar to 100 bar at $$25^\circ\text{C}$$ at constant external pressure of 500 bar is
The power and wavelength emitted by a laser pointer commonly used in Power Point presentations are 1.0 mW and 670 nm respectively. Number of photons emitted by this pointer during a presentation of 5 minutes is
The number of stereoisomers is maximum for
Which of the following is NOT correct about hydrides?
I. Saline hydrides are stoichiometric and metallic hydrides are non-stoichiometric.
II. $$\text{BeH}_2$$ is monomeric whereas $$\text{MgH}_2$$ is polymeric.
III. Hydrides of the elements of Group 13 are electron deficient and those of Group 15 are electron rich.
IV. NaH reacts with water and liberates $$\text{H}_2$$ whereas $$\text{B}_2\text{H}_6$$ does not react with water.
Atropine ($$\text{C}_{17}\text{H}_{23}\text{O}_3\text{N}$$) is a naturally occurring compound used to treat certain types of poisoning. The degree of unsaturation in atropine is
The compounds X and Y formed in the following reaction are
In which of the following, is a new C-C bond formed in the product?
Aqueous solution of slaked lime, $$\text{Ca(OH)}_2$$, is extensively used in municipal waste water treatment. Maximum pH possible in an aqueous solution of slaked lime is ($$K_{sp}$$ of $$\text{Ca(OH)}_2 = 5.5 \times 10^{-6}$$)
An electron present in the third excited state of a H atom returns to the first excited state and then to the ground state. If $$\lambda_1$$ and $$\lambda_2$$ are the wavelengths of light emitted in these two transitions respectively, $$\lambda_1 \colon \lambda_2$$ is
$$\text{MnCl}_2\cdot 4\text{H}_2\text{O}$$ (molar mass 198 g $$\text{mol}^{-1}$$) when dissolved in water forms a complex of $$\text{Mn}^{2+}$$. An aqueous solution containing 0.400 g of $$\text{MnCl}_2\cdot 4\text{H}_2\text{O}$$ was passed through a column of a cation exchange resin and the acid solution coming out was neutralized with 10 mL of 0.20 M NaOH. The formula of the complex formed is
IUPAC name of the following molecule is
The product or products of the following reaction is or are
The percentage dissociation of 0.08 M aqueous acetic acid solution at $$25^\circ\text{C}$$ is ($$K_a$$ of acetic acid at $$25^\circ\text{C}$$ is $$1.8 \times 10^{-5}$$)
For which of the following processes, carried out in free space, energy will be absorbed?
I. Separating an electron from an electron.
II. Removing an electron from a neutral atom.
III. Separating a proton from a proton.
IV. Separating an electron from a proton.
Decay of radioisotopes follows first order kinetics. Radioisotope $$\text{U}^{238}$$ undergoes decay to a stable isotope, $$\text{Th}^{234}$$. The ratio of the number of atoms of $$\text{U}^{238}$$ to that of $$\text{Th}^{234}$$ after three half lives is
Myoglobin (Mb), an oxygen storage protein, contains 0.34 % Fe by mass and in each molecule of myoglobin one ion of Fe is present. Molar mass of Mb (g $$\text{mol}^{-1}$$) is (Molar mass of Fe is 55.845 g $$\text{mol}^{-1}$$)
The following Ellingham diagram depicts the oxidation of C, CO and Fe. Which of the following is correct?
I. FeO can be reduced by C below 600 K.
II. FeO can be reduced by CO below 600 K.
III. FeO can be reduced by C above 1000 K.
IV. FeO can be reduced by CO above 1000 K.
$$\text{N}^{3-}$$, $$\text{F}^-$$, $$\text{Na}^+$$ and $$\text{Mg}^{2+}$$ have the same number of electrons. Which of them will have the smallest and the largest ionic radii respectively?
The reaction of 2,4-hexadiene with one equivalent of bromine at $$0^\circ\text{C}$$ gives a mixture of two compounds X and Y. If X is 4,5-dibromohex-2-ene, Y is
The major product of the following reaction is
The kinetic energy of the photoelectrons ejected by a metal surface increased from 0.6 eV to 0.9 eV when the energy of the incident photons was increased by 20 %. The work function of the metal is
An electrochemical cell was constructed with $$\text{Fe}^{2+}$$/Fe and $$\text{Cd}^{2+}$$/Cd at $$25^\circ\text{C}$$ with initial concentrations of $$[\text{Fe}^{2+}]$$ = 0.800 M and $$[\text{Cd}^{2+}]$$ = 0.250 M. The EMF of the cell when $$[\text{Cd}^{2+}]$$ becomes 0.100 M is
The alkene ligand ($$\pi\text{-C}_2\text{R}_4$$) is both a sigma donor and a pi acceptor, similar to the CO ligand in metal carbonyls, and exhibits synergic bonding with metals. Correct order of C-C bond length in $$\text{K}[\text{PtCl}_3(\pi\text{-C}_2\text{R}_4)]$$ complexes in which R = H, F or CN is
The correct order of CFSE among $$[\text{Zn(NH}_3)_4]^{2+}$$, $$[\text{Co(NH}_3)_6]^{2+}$$ and $$[\text{Co(NH}_3)_6]^{3+}$$ is
The number of asymmetric carbon atoms in strychnine, whose structure given below is
When acid X is heated to $$230^\circ\text{C}$$, along with $$\text{CO}_2$$ and $$\text{H}_2\text{O}$$, a compound Y is formed. If X is $$\text{HOOC(CH}_2)_2\text{CH(COOH)}_2$$ the structure of Y is
Number of products formed (ignoring stereoisomerism) in the monochlorination of ethylcyclohexane is
Molten NaCl is electrolysed for 35 minutes with a current of 3.50 A at $$40^\circ\text{C}$$ and 1 bar pressure. Volume of chlorine gas evolved in this electrolysis is
A balance having a precision of 0.001 g was used to measure a mass of a sample of about 15 g. The number of significant figures to be reported in this measurement is
Which of the following pairs of compounds can be stable while retaining the identity of each compound in the pair over a period of time? I. $$\text{FeCl}_3$$ and $$\text{SnCl}_2$$. II. $$\text{HgCl}_2$$ and $$\text{SnCl}_2$$. III. $$\text{FeCl}_2$$ and $$\text{SnCl}_2$$. IV. $$\text{FeCl}_3$$ and KI.
Which of the following is correct about the isoelectronic species, $$\text{Li}^+$$ and $$\text{H}^-$$?
I. $$\text{H}^-$$ is larger in size than $$\text{Li}^+$$.
II. $$\text{Li}^+$$ is a better reducing agent than $$\text{H}^-$$.
III. It requires more energy to remove an electron from $$\text{H}^-$$ than from $$\text{Li}^+$$.
IV. The chemical properties of the two ions are the same.
The major product P formed in the following sequence of reactions is
Sodium lauryl sulphate (SLS) is a surface active agent, which is adsorbed on water surface. The number of molecules of SLS that can be adsorbed on the surface of a spherical water droplet of diameter 3.5 mm is (effective area of one molecule of SLS is $$4.18\ \text{nm}^2$$)
The reaction $$xX(g) \rightleftharpoons yY(g) + zZ(g)$$ was carried out at a certain temperature with an initial pressure of X of 30 bar. Initially Y and Z were not present. If the equilibrium partial pressures of X, Y and Z are 20, 5 and 10 bar respectively, $$x \colon y \colon z$$ is
The unit of Planck's constant, h, is the same as that of
A commercial sample of oleum ($$\text{H}_2\text{S}_2\text{O}_7$$) labeled as 106.5 % oleum contains 6.5 g of water. The percentage of free $$\text{SO}_3$$ in this oleum sample is
Among the following, the complex ion or ions that will have a magnetic moment of 2.82 B.M. is or are I. $$[\text{Ni(CO)}_4]$$. II. $$[\text{NiCl}_4]^{2-}$$. III. $$[\text{Ni(H}_2\text{O})_6]^{2+}$$. IV. $$[\text{Ni(CN)}_4]^{2-}$$.
A suboxide of carbon, $$\text{C}_3\text{O}_2$$, has a linear structure. Which of the following is correct about $$\text{C}_3\text{O}_2$$?
I. Oxidation state of all three C atoms is +2.
II. Oxidation state of the central C atom is zero.
III. The molecule contains 4 sigma and 4 pi bonds.
IV. Hybridization of the central carbon atom is $$sp^2$$.
Among the following, the compounds with highest and lowest boiling points respectively are
Saran wrap, a polymer used in food packaging is a copolymer of 1,1-dichloroethene and vinyl chloride. In the chain initiation step, 1,1-dichloroethene generates a free radical which reacts with vinyl chloride. Structure of Saran wrap is
At $$25^\circ\text{C}$$ the $$K_a$$ values of $$\text{HPO}_4^{2-}$$ and $$\text{HSO}_3^-$$ are $$4.8 \times 10^{-13}$$ and $$6.3 \times 10^{-8}$$ respectively. Which of the following is correct?
The change in internal energy for the reaction $$\text{H}_2(g) + \text{Br}_2(g) \rightarrow 2\text{HBr}(l)$$ when 2.0 moles each of $$\text{Br}_2(g)$$ and $$\text{H}_2(g)$$ react is, given that for $$\text{H}_2(g) + \text{Br}_2(g) \rightarrow 2\text{HBr}(g)$$ the enthalpy of reaction is $$-109$$ kJ and the enthalpy of vaporisation of HBr is 213 kJ $$\text{mol}^{-1}$$
About sea water, which of the following statement or statements is or are correct?
I. Frozen sea water melts at a lower temperature than pure ice.
II. Boiling point of sea water increases as it evaporates.
III. Sea water boils at a lower temperature than fresh water.
IV. Density of sea water at STP is same as that of fresh water.
Which of the following species has one lone pair of electrons on the central atom?
The alkene Y in the following reaction is
The structure that represents the major intermediate formed in the bromination of toluene is
The major product P formed in the following reaction is, where the asterisk denotes radioactive carbon
If the standard electrode potentials of $$\text{Fe}^{3+}$$/Fe and $$\text{Fe}^{2+}$$/Fe are $$-0.04$$ V and $$-0.44$$ V respectively, then that of $$\text{Fe}^{3+}$$/$$\text{Fe}^{2+}$$ is
Given below is the data for the reaction $$2\text{NO}(g) \rightleftharpoons \text{N}_2(g) + \text{O}_2(g)$$,where $$k_f$$ and $$k_b$$ are the rate constants of the forword and reverse reaction respectively, The reaction is
The crystal defect indicated in the diagram below is
In solid state, $$\text{PCl}_5$$ exists as $$[\text{PCl}_4]^+[\text{PCl}_6]^-$$. The hybridization of P atoms in this solid is or are
Which of the following compounds have chiral carbon atom or atoms? I is cyclopent-2-en-1-ol, II is cyclopent-3-en-1-ol, III is but-3-en-2-ol, IV is cyclohex-2-en-1-ol and V is 3-chlorobutan-2-ol.
Lipoic acid with the following structure is a growth factor required by many organisms. Percentages of S and O in lipoic acid respectively are (atomic masses of S and O are 32.065 g $$\text{mol}^{-1}$$ and 15.999 g $$\text{mol}^{-1}$$ respectively)
Among the halides $$\text{NCl}_3$$ (I), $$\text{PCl}_3$$ (II) and $$\text{AsCl}_3$$ (III), more than one type of acid in aqueous solution is formed with
A helium cylinder in which the volume of gas is 2.24 L at STP (1 atm, 273 K) developed a leak and when the leak was plugged the pressure in the cylinder was seen to have dropped to 550 mm of Hg. The number of moles of He gas that had escaped due to this leak is
The anhydride of $$\text{HNO}_3$$ is
An excess of aqueous ammonia is added to three different flasks $$\text{F}_1$$, $$\text{F}_2$$ and $$\text{F}_3$$ containing aqueous solutions of $$\text{CuSO}_4$$, $$\text{Fe}_2(\text{SO}_4)_3$$ and $$\text{NiSO}_4$$ respectively. Which of the following is correct about this addition?
I. A precipitate will be formed in all three flasks.
II. Ammonia acts as a base as well as a ligand exchange reagent in $$\text{F}_1$$ and $$\text{F}_3$$.
III. A soluble complex of $$\text{NH}_3$$ and the metal ion is formed in $$\text{F}_1$$ and $$\text{F}_3$$.
IV. A precipitate will be formed only in $$\text{F}_2$$.
The mass (g) of NaCl that has to be dissolved to reduce the vapour pressure of 100 g of water by 10 % (Molar mass of NaCl is 58.5 g $$\text{mol}^{-1}$$) is
The reagent or reagents that can be used to separate norethindrone and novestrol from their mixture is or are
Which of the following is or are electrophilic aromatic substitution reaction or reactions?
All four types of carbon (primary, secondary, tertiary and quaternary) are present in,
The normal boiling point and enthalpy of vaporisation of a liquid X are 400 K and 40 kJ $$\text{mol}^{-1}$$ respectively. Assuming the enthalpy of vaporisation to be constant, which of the following is correct?
I. The entropy of vaporisation is greater than $$100\ \text{J K}^{-1}\text{mol}^{-1}$$ at 400 K and 0.5 atm.
II. It is less than $$100\ \text{J K}^{-1}\text{mol}^{-1}$$ at 400 K and 1 atm.
III. It is less than $$100\ \text{J K}^{-1}\text{mol}^{-1}$$ at 400 K and 2 atm.
IV. It equals $$100\ \text{kJ K}^{-1}\text{mol}^{-1}$$ at 400 K and 1 atm.
About the energy level diagram given below, which of the following statement or statements is or are correct?
I. The reaction is of two steps and R is an intermediate.
II. The reaction is exothermic and step 2 is rate determining.
III. Q is an intermediate and R is the transition state for the reaction M to Q.
IV. P is the transition state for the reaction Q to N.
Mercury is highly hazardous and hence its concentration is expressed in the units of ppb (micrograms of Hg present in 1 L of water). Permissible level of Hg in drinking water is 0.0335 ppb. Which of the following is an alternate representation of this concentration?
Which of the following is correct?
I. Sodium (Na) is present as metal in nature.
II. $$\text{Na}_2\text{O}_2$$ is paramagnetic.
III. $$\text{NaO}_2$$ is paramagnetic.
IV. Na reacts with $$\text{N}_2$$ to form $$\text{Na}_3\text{N}$$.
The F-X-F bond angle is the smallest in (X is the central atom)
The correct sequence of reactions which will yield 4-nitrobenzoic acid from benzene is
Two isomeric hydrocarbons X and Y ($$\text{C}_4\text{H}_6$$), give the same product ($$\text{C}_4\text{H}_8\text{O}$$) on catalytic hydration with dilute acid. However, they form different products but with same molecular formula ($$\text{C}_4\text{H}_6\text{Br}_4$$) when treated with excess bromine. X and Y are
Morphine, a pain killer is basic with the molecular formula $$\text{C}_{17}\text{H}_{19}\text{NO}_3$$. The conjugate acid of morphine is
The correct IUPAC name of the compound, $$[\text{Pt(py)}_4][\text{Pt(Br)}_4]$$ is
Which atom or atoms will have a $$\delta^{+}$$ charge in the following molecule?
The most acidic hydrogen in the following molecule is
In which of the following species is the octet rule NOT obeyed? I. $$\text{I}_3^-$$. II. $$\text{N}_2\text{O}$$. III. $$\text{OF}_2$$. IV. $$\text{NO}^+$$.
The volume of one drop of aqueous solution from an eyedropper is approximately 0.05 mL. One such drop of 0.2 M HCl is added to 100 mL of distilled water. The pH of the resulting solution will be
2.0 moles of an ideal gas expands isothermally at $$27^\circ\text{C}$$ and reversibly between pressures of 1 bar and 10 bar. The heaviest mass that can be lifted through a height of 10 m by the work of this expansion is
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