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The ligand with which the homoleptic octahedral complex of $$\text{Co}^{3+}$$ will be most stable is
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The ligand with which the homoleptic octahedral complex of $$\text{Co}^{3+}$$ will be most stable is
Which of the following properties may have positive values of $$\Delta H$$?
(i) Lattice enthalpy (ii) Hydration enthalpy
(iii) Electron gain enthalpy for noble gases (iv) Ionisation enthalpy
The correct IUPAC name of potassium permanganate is
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Which of the following statements is true with respect to sodium salts of oxoanions of phosphorus $$\text{NaH}_2\text{PO}_2$$ and $$\text{Na}_2\text{HPO}_3$$?
The fluorides of xenon, $$\text{XeF}_n$$ with n equal to 2 or 4 or 6, which on complete hydrolysis give back xenon as one of the products, are
I. $$\text{XeF}_2$$
II. $$\text{XeF}_4$$
III. $$\text{XeF}_6$$
If an element after oganesson, Og, of atomic number 118 and electronic configuration [Rn] $$5f^{14} 6d^{10} 7s^2 7p^6$$, was discovered, in which of the following orbitals will the 119th electron be accommodated?
The number of two-center-two-electron and three-center-two-electron bonds in $$[\text{Al(BH}_4)_3]$$ are respectively
Identify the correct matching of the following oxides in column M with their property in column N.
In each of the following reactions the role of water is
(i) $$\text{H}_2\text{O} + \text{HCl} \rightarrow \text{H}_3\text{O}^+ + \text{Cl}^-$$
(ii) $$6\text{H}_2\text{O} + \text{Mg}^{2+} \rightarrow [\text{Mg(H}_2\text{O})_6]^{2+}$$
(iii) $$2\text{H}_2\text{O} + 2\text{F}_2 \rightarrow 4\text{HF} + \text{O}_2$$
The correct order of the following oxidizing agents in basic aqueous medium, given that
$$\text{CrO}_4^{2-}/\text{Cr}^{3+}$$ has $$E^\circ = -0.11$$ V,
$$\text{FeO}_4^{2-}/\text{Fe}^{3+}$$ has $$E^\circ = +0.72$$ V and
$$\text{MnO}_4^{2-}/\text{Mn}^{3+}$$ has $$E^\circ = +0.46$$ V, is
The correct order of ionic radii of $$\text{Rb}^+$$, $$\text{Br}^-$$, $$\text{Sr}^{2+}$$ and $$\text{Se}^{2-}$$ is
Consider the following statements.
(i) Calcination is carried out in absence of air below the melting point of the ore
(ii) Roasting and calcination are carried out in presence of flux
(iii) Calcination is carried out in limited supply of air above the melting point of the ore
(iv) Roasting is carried out in air below the melting point of ore. The correct set of statements is
The cobalt complexes (I) and (II) given below are examples of
The magnetic moment, in units of BM, of copper in $$[\text{Cu(H}_2\text{O})_4]^{2+}$$ and $$[\text{Cu(NH}_3)_4]^{2+}$$ respectively is
In qualitative inorganic analysis of a water-soluble salt mixture, salt AB together with salt XY, both the cations were identified as sulphides. In the tests for anions the sodium carbonate extract when treated with $$\text{AgNO}_3$$ gave a yellowish precipitate soluble with difficulty in $$\text{NH}_4\text{OH}$$ while the other anion can be confirmed with the brown ring test. Given that $$K_{sp}$$ for AS is $$1 \times 10^{-44}$$ and for XS is $$1.4 \times 10^{-24}$$, identify the INCORRECT statement about the analysis.
The correct statement about the solubilities of Group 2 hydroxides is
A solution of $$\text{CuSO}_4 \cdot 5\text{H}_2\text{O}$$ in methanol has $$[\text{Cu}^{2+}] = 1.00$$ mg per 1000 g of methanol. The molarity of $$\text{Cu}^{2+}$$ in this solution is $$Y \times 10^{-5}$$ mol $$\text{L}^{-1}$$. Given that the density of methanol is 0.792 g $$\text{mL}^{-1}$$, Y is
Following is the reaction flow chart for manganese oxidocomplexes under different alkaline pH conditions. Compounds (S) and (T) respectively are
The correct order of relative strength for the following nucleophilic species, namely
I) $$\text{NH}_2^-$$
II) $$\text{OCH}_3^-$$
III) $$\text{CH}_3\text{COO}^-$$
IV) $$\text{CH}_3\text{OH}$$
The product obtained on reaction of optically pure 1-bromo-1-phenyl ethane with $$\text{CH}_3\text{OH}$$ is
An alkane [X] contains five $$1º$$, two $$2º$$, one $$3º$$ and one $$4º$$ carbon atoms. The IUPAC name of [X] is
The number of isomeric alkenes with molecular formula $$\text{C}_5\text{H}_{10}$$, taking stereoisomers into account, is
At $$0^\circ\text{C}$$, 1 equivalent of bromine is added to 2,4-hexadiene to produce 4,5-dibromo-2-hexene and its isomer X. X is
Which of the following is or are examples of an acetal?
The compound which can be produced by double aldol condensation of 1-phenyl-1,2-propanedione is
2,2-Dimethyl-1,3-propanediol is formed by heating 2-methylpropanal with an excess of formaldehyde and $$\text{Ca(OH)}_2$$. The sequence of reactions taking place in this synthesis is
The number of different types of dipeptides produced using a mixture of glycine and L-valine, and the number of optically active dipeptides formed in this mixture, will be
Predict the major product in the following reaction, where PCC is pyridinium chlorochromate.
Find out the product in the following reaction.
The products obtained on reaction of biphenyl (Ph-Ph) with nitrating mixture, $$\text{HNO}_3$$ and $$\text{H}_2\text{SO}_4$$, are
Chlorination of propane gives four dichloro products. One of them is optically active. The number of trichloro products possible from the optically active dichloro product, excluding stereoisomers, is
The suitable reagent for the following transformation is
Column A represents a set of functional groups and Column B their respective electronic effects The correct match is:
[EDG: Electron donating group and EWG: Electron withdrawing group]
The correct order of reactivity of $$-\text{CHO}$$, $$-\text{COR}$$, $$-\text{COOR}$$ and $$-\text{CONR}_2$$ groups toward MeMgI in ether is
The plots of energy density, that is energy per unit area, against wavelength for blackbody radiation at various temperatures are given below. The correct option among the following is:
(i) $$T_1 > T_2 > T_3 > T_4 > T_5$$
(ii) As temperature increases, the wavelength at which the intensity is maximum shifts towards the higher energy regions of the electromagnetic spectrum
(iii) Radiations of all wavelengths are emitted, absorbed, reflected, and refracted by the black body
(iv) The total energy density increases as the temperature is decreased.
The correct option among the following is
A student adds 'x' g of iron (Fe) powder to dil. HCl and measures the work done by the reaction between HCl and the added Fe to be 1000 J. If the experiment was conducted at a constant pressure of 1 atm at $$27^\circ\text{C}$$, the mass of Fe powder added is
Antacids are medicines that temporarily neutralize the acid in the stomach and prevent heartburns. The volume of an antacid syrup containing 2.9 g of $$\text{Mg(OH)}_2$$ per 100 mL to be given to a patient whose stomach contains 2 L of gastric juice with HCl concentration of $$6.0 \times 10^{-3}$$ M is, given that the molar mass of $$\text{Mg(OH)}_2$$ is 58.0 g $$\text{mol}^{-1}$$,
A half-cell reaction represented by (i) below, namely
$$\text{Fe(OH)}_2(s) + 2e^- \rightarrow \text{Fe}(s) + 2\text{OH}^-(aq)$$ with $$E^\circ = -0.9$$ V, takes place in two different electrochemical cells, I and II, in which the other half cell reactions are
(ii) $$\text{Al}^{3+}(aq) + 3e^- \rightarrow \text{Al}(s)$$ with $$E^\circ = -1.7$$ V and
(iii) $$\text{AgBr}(s) + e^- \rightarrow \text{Ag}(s) + \text{Br}^-(aq)$$ with $$E^\circ = -0.07$$ V respectively.
The correct option that represents the redox reactions in cells I and II is
The following are the concentration versus time plots of the reactants and products represented by the reaction
$$\text{L}(g) + 2\text{M}(g) \rightarrow \text{N}(g) + 3\text{O}(g)$$.
The curves that represent M(g) and N(g) qualitatively are respectively
The current produced due to photoelectric effect
The property of radiation that is not different at various regions of the electromagnetic spectrum is
Among the following, the correct statements about the compressibility factor (Z) of real gases are
(i) If $$Z < 1$$, intermolecular repulsive forces are more dominant
(ii) If $$Z < 1$$, intermolecular attractive forces are more dominant
(iii) If $$Z > 1$$, intermolecular repulsive forces are more dominant
(iv) If $$Z > 1$$, intermolecular attractive forces are more dominant
The figure represents the processes AB, BC and CA undertaken by a certain mass of an ideal gas. Along the path AB, the gas is isothermally compressed with release of 800 J heat to the surroundings. It is then compressed adiabatically along the path BC and the work done is 500 J. The gas then returns to the state A along path CA and absorbs 100 J heat from the surroundings. The work done by the gas along the path CA is
Two flasks I and II of equal volume are evacuated and connected by a tube of negligible volume fitted with a stopcock. They are then placed in two different constant temperature baths of 250 K and 750 K respectively. 20 moles of an ideal gas are introduced into the system of these flasks through the stopcock. When the system reaches equilibrium, the ratio of the moles of the gas in flasks I and II is
When a certain amount of a univalent salt AB of molar mass 54 g $$\text{mol}^{-1}$$ was dissolved in 0.1 $$\text{dm}^3$$ of water, the relative lowering of the vapour pressure was found to be 3.55%. Assuming complete dissociation of the salt under the given condition and taking the density of water as 1 g $$\text{cm}^{-3}$$, the molality of the resulting solution is
The rate constant values for the decay of radioisotopes X and Y, used in radio-medicine, are 0.05 $$\text{h}^{-1}$$ and 0.025 $$\text{h}^{-1}$$ respectively. In a hospital, at a time $$t_0$$ the activity of a sample of X was found to be twice that of Y. The activities of the two radioisotopes will be approximately equal when the time elapsed is
Latimer diagrams are the compact representations of electrochemical equilibria in substances of multiple oxidation states. The value of the potential x in the Latimer diagram of gold at pH equal to 1.0 is
Electrolysis of aqueous $$\text{CuSO}_4$$ (0.1 M) was carried out in two cells I and II. In I, the electrodes are of Cu and in II they were of Pt. As the electrolysis proceeds the pH of the electrolyte solution will
Choose the correct statements regarding zeolites.
Crystalline iron(III) nitrate nonahydrate, $$\text{Fe(NO}_3)_3 \cdot 9\text{H}_2\text{O}$$, has a very pale violet colour. When added to water, the crystals dissolve to form a brown solution. Treatment of this brown solution with concentrated nitric acid yields a very pale violet solution while treatment with HCl yields a yellow solution. Identify the correct statements regarding the above observations.
The optically active compounds from the following are
3-chlorotoluene is reacted with a mixture of conc. $$\text{H}_2\text{SO}_4$$ and $$\text{HNO}_3$$. The products formed are
2,4,6-trinitrophenol is more acidic than phenol. Identify the correct statements.
The correct statements for 1,3-butadiene from the following are
Which of the following representations will exhibit cis-trans isomerism?
For an elementary dimerization reaction of the type $$2\text{R} \rightarrow \text{R}_2$$, the value of the steric factor was found to be 2.5. This indicates that
The correct statements among the following are
In reverse osmosis the flow of solvent across a semi permeable membrane occurs
Given below is the plot of pH versus volume of NaOH added in an acid-base titration. The correct statements among the following are
The correct statements among the following are
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