Recent questions tagged 2004

Coordination compound have great importance in biological systems. In this context which of the living following statements is incorrect ?

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Which one of the following complexes in an outer orbital complex ?

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The coordination number of central metal aom in a complex is determined by

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Among the properties (a) reducing (b) oxidising (c) complexing, the set of properties shown by $CN^-$ ion towards metal species is

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Excess of $KI$ reacts with $CuSO_4$ solution and then $Na_2S_2O_3$ solution is added to it. Which of the statements is incorrect for this reaction ?

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The $E^{\circ}_{M^{+3}/M^{2+}}$ values for $Cr, \; Mn, \; Fe$ and $Co$ are $-0.41, \; +1.57, \; + 0.77$ and $+1.97 /;\;V$ respectively. For which one of these metals the change in oxidation state form $+2$ and $+3$ is easiest ?

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The soldiers of Napolean army while at Alps during freezing winter suffered a serious problem as regards to the tin buttons of their uniforms. White metallic tin buttons got converted to grey powder. This transformation is related to

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Aluminium chloride exists as dimer, $Al_2Cl_6$ in solid state as well as in solution of non-polar solvents such as benzene. When dissolved in water, it gives

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Beryllium and aluminium exhibit many properties which are similar. But the two elements differ in

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Which one of the following ores is best concentrated by froth-floatation method ?

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One mole of magnesium nitride on the reaction with an excess of water gives

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Identify the correct statements regarding enzymes

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Which one the following statement regarding helium is incorrect ?

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In a cell that utilises the reaction $Zn(s) + 2H^+(aq) \to Zn^{2+} (aq) + H_2(g)$ addition of $H_2SO_4$ to cathode compartment, will

asked Nov 5, 2018 by pady_1

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The limiting molar conductivities $\bigwedge^{\circ}$ for $NaCl,\;KBr$ and $KCl$ are $126, \;152$ and $150\; S\; cm^2 \; mol^{-1}$ respectively. The $\bigwedge^{\circ}$ for $NaBr$ is

asked Nov 5, 2018 by pady_1

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The enthalpies of combustion of carbon and carbon monoxide are $-393.5$ and $-283 \; kJ\; mol^{-1}$ respectively. The enthalpy of formation of carbon monoxide per mole is

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The standard e.m.f of a cell, involving one electron change is found to be 0.591 V at $25^{\circ}C$. The equilibrium constant of the reaction is $(F = 96,500\;C\;mol^{-1} : R = 8.314 \; JK^{-1}\;mol^{-1})$

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The molar solubility products is $K_{sp}$. 's' is given in terms of $K_{sp}$ by the relation

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Consider the following $E^{\circ}$ values $E^{\circ}_{Fe^{3+}/Fe^{2+}} = 0.77V$ $E^{\circ}_{Sn^{2+}/Sn} = -0.14V$ Under standard conditions the potential for the reaction $Sn(s) + 2Fe^{3+}(aq) \to 2Fe^{2+} (aq) + Sn^{2+}(aq)$ is

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The rate equation for the reaction $2A + B \to C$ is found to be : rate $k[A][B]$. The correct statement in relation to this reaction is that the

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The equilibrium constant for the reaction $N_2(g) +O_2(g) \leftrightharpoons 2NO(g)$ at temperature $T$ is $4 \times 10^{-4}$. The value of $Kc$ for the reaction $NO(g) \leftrightharpoons \frac{1}{2} N_2 (g) + \frac{1}{2} O_2 (g) $ at the same temperature is

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For the reaction, $CO(g) + Cl_2 (g) \leftrightharpoons COCl_2(g) $ the $\frac{K_p}{K_c}$ is equal to

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What is the equilibrium expression for the reaction $P_{4(s)} + 5O_{2(g)} \leftrightharpoons P_4O_{10 (s)} $?

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In first order reaction, the concentration of the reactant decreases from 0.8 M to 0.4 M in 15 minutes. The time taken for the concentration to change from 0.1 M to 0.025 M is

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In hydrogen-oxygen fuel cell, combustion of hydrogen occurs to

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An ideal gas expands in volume from $1 \times 10^{-3} m^{3} $ to $1 \times 10^{-2} m^3$ at 300 K against a constant pressure of $1 \times 10^5 \; Nm^{-2}$. The work done is

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What type of crystal defect is indicated in the diagram below ?

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Which one of the following statements is false ?

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Which of the following liquid pairs shows a positive derivation from Raoult's law?

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For which of the following parameters the structural isomers $C_2H_5OH$ and $CH_3OCH_3$ would be expected to have the same values ? (Assume ideal behaviour)

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To neutralize completely $20\; mL$ of $0.1\; M$ aqueous solution of phosphorous acid $(H_3PO_3)$, the volume of $0.1 \; M$ aqueous $KOH$ solution required is

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$6.02 \times 10^{20}$ molecules of urea are present in $100\; ml$ of its solution. The concentration of urea solution is

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The conjugate base of $H_2PO_4^-$ is

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In Vander Waals equation of state of the gas law, the constant 'b' is a measure of

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Which among the following factors is the most important in making fluorine the strongest oxidizing halogen ?

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Which one of the following aqueous solutions will exhibit highest boiling point ?

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The maximum number of $90^{\circ}$ angles between bond pair of electrons is observed in

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As the temperature is raised from $20^{\circ}C$ to $40^{\circ}C$, the average kinetic energy of neon atoms changes by a factor of which of the following?

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Of the following outer electronic configurations of atoms, the highest oxidation state is achieved by which one of them ?

asked Nov 5, 2018 by pady_1

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Which one of the following has the regular tetrahedral structure ?

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The states of hybridization of boron and oxygen atoms in boric acis$(H_3BO_3)$ are respectively

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The formulation of the oxide ion $O^{2-} (g)$ requires first an exothermic and then an endothermic step as shown below $O(g) + e^-O^-(g) \Delta H^{\circ} = -142 \; kJ\; mol^{-1}$ $O^-(g) + e^-O^{2-} (g) \Delta H^{\circ} = 844\;kJ\; mol^{-1}$

asked Nov 5, 2018 by pady_1

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The bond order in NO is 2.5 while that in $NO^+$ is 3. Which of the following statements is true for these two species ?

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Among $Al_2O_3, SiO_2, P_2O_3$ and $SO_2$ the correct order of acid strength is

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Which one of the following sets of ions represents the collection of isoelectronic species ?

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The correct order of bond angles (smallest first) in $H_2S, \; NH_3, \; BF_3$ and $SiH_4$ is

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The wavelength of the radiation emitted, when in hydrogen atom electron falls from infinity to stationary state , would be (Rydberg constant = $1.097 \times 10^7\; m^{-1}$)

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Which one of the following ions has the highest value of ionic radius ?

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Consider the ground state of Cr atom (Z = 24). The number of electrons with the azimuthal quantum numbers $l = 1$ and $2$ are respectively

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Which of the following sets of quantum numbers is correct for an electron in 4f orbital ?

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