Recent questions tagged past papers

The rate of a reaction doubles when its temperature changes from 300 K to 310 K. Activation energy of such a reaction will be : ($ R = 8.314 \; JK^{-1} mol^{-1}$ and $log\;2 = 0.301$)

asked Dec 11, 2018 by pady_1

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Arrange the following compounds in order of decreasing acidity :

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Given $E^0_{Cr^{3+}/Cr} = -0.74 \; V; \; E^0_{MnO_4^-/Mn^{2+}} = 1.51 \; V$ $E^0_{Cr_2O_7^{2-} / Cr^{3+}} = 1.33\; V; \;E^0_{Cl/Cl^-} = 1.36\; V$ Based on the data given abov, strongest oxidising agent will be :

asked Dec 11, 2018 by pady_1

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A compound with molecular mass 180 is acylated with $CH_2COCl$ to get a compound with molecular mass 390. The number of amino groups present per molecule of the former compound is :

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Experimentally it was found that a metal oxide has formula $M_{0.98}O$. Metal M, is present as $M^{2+}$ and $M^{3+}$ in its oxide. Fraction of the metal which exists as $M^{3+}$ would be :

asked Dec 11, 2018 by pady_1

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Which of the following arrangements does not represent the correct order of the property stated against it ?

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Which one of the following molecules is expected to exhibit diamagnetic behaviour ?

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How many litres of water must be added to 1 litre of an awueous solution of HCl with a pH of 1 to create an aqueous solution with pH of 2 ?

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The coagulating power of electrolytes having ions $Na^+, Al^{3+}$ and $Ba^{2+}$ for arsenic sulphide sol increases in the order :

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A solution of $(-) -1 - chloro - 1 - phenylethane$ is toluene racemises slowly in the presence of a small amount of $SbCl_5$, due to the formation of :

asked Dec 11, 2018 by pady_1

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Four successive members of the first row transition elements are listed with atomic numbers. Which one of them is expected to have the highest $E^0_{M^{3+}/M^{2+}}$ value ?

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Which of the following is the wrong statement ?

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The molrity of a solution obtained by mixing 750 mL of 0.5 (M) HCl with 250 mL of 2(M) HCl will be :

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Stability of the species $Li_2, Li_2^-$ and $Li_2^+$ increases in the order of :

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The first ionization potential of Na is 5.1 eV. The value of electron gain enthalpy of $Na^+$ will be :

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An unknown alcohol is treated with the "Lucas reagent" to determine the alcohol is primary, secondary or tertiary. Which alcohol reacts fastest and by what mechanism :

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The population $p(t)$ at time $t$ of a certain mouse species satisfies the differential equation $\frac{dp(t)}{dt} = 0.5\; p(t) -450$. If $p(0) = 850$, then the time at which the population becomes zero is

asked Dec 11, 2018 by pady_1

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In the given transformation, which of the following is the most appropriate reagent ?

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In which of the following pairs the two species are not isostructural ?

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Iodoform can be prepared from all except :

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2-Hexyne gives trans-2-Hexene on treatment with :

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The increasing order of he ionic radii of the given isoelectronic species is :

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What is DDT among the following :

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$K_f$ for water is $1.86 \;K\;mol^{-1}$. If your automobile radiator holds 1.0 kg of water, how many grams of ethylene glycol $(C_2H_6O_2)$ must you add to get the freezing point of the solution lowered to $-2.8^{\circ}C$ ?

asked Dec 11, 2018 by pady_1

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Which branched chain isomer of the hydrocarbon with molecular mass 72 u gives only one isomer of mono substituted alky halide ?

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The pH of a 0.1 molar solution of the acid HQ is 3. The value of the ionization constant, Ka of this acid is :

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Iron exhibits +2 and +3 oxidation states. Which of the following statements about iron is incorrect ?

asked Dec 11, 2018 by pady_1

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For a first order reaction, $(A) \to products$, the concentration of A changes from 0.1 M to 0.025 M in 40 minutes. The rate of reaction when the concentration of A is 0.01 M is :

asked Dec 11, 2018 by pady_1

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The electrons identified by quantum numbers n and I : (a) n = 4, I = 1 (b) n = 4, I = 0 (c) n = 3, I = 2 (d) n = 3, I = 1 Can be placced in order of increasing energy as :

asked Dec 11, 2018 by pady_1

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Very pure hydrogen (99.9%) can be made by which of the following processes ?

asked Dec 11, 2018 by pady_1

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How many chiral compounds are possible on monochlorination of 2-methyl butane ?

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Ortho-Nitrophenol is less soluble in water than p- and m- Nitrophenols because :

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Aspirin is known as :

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Which one of the following statements is correct ?

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The compressibility factor for a real gas at high pressure is :

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

asked Dec 11, 2018 by pady_1

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According toFreundiich adsorption isotherm, which of the following is correct ?

asked Dec 11, 2018 by pady_1

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The standard reduction potentials for $Zn^{2+}/Zn, Ni^{2+}/Ni$ and $Fe^{2+}/Fe$ are -0.76, -0.23 and -0.44V respectively. The reaction $X + Y^2 \to X^{2+} + Y$ will be spontaneous when :

asked Dec 11, 2018 by pady_1

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Which of the following on thermal decomposition yields a basic as well as an acidic oxide ?

asked Dec 11, 2018 by pady_1

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The species which can best serve as an initiator for the cationic polymerization is :

asked Dec 11, 2018 by pady_1

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The density of a solution prepared by dissolving 120 g of urea ( mol. Mass = 60 u) in 1000 g of water is 1.15 g/mL. The molarity of this solution is :

asked Dec 11, 2018 by pady_1

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The incorrect expression among the following is :

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Which of the following compounds can be detected by Molisch's test ?

asked Dec 11, 2018 by pady_1

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The molecule having smallest bond angle is :

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Lithium forms body centred cubic structure. The length of the side of its unit cell is 351 pm. Atomic radius of the lithium will be :

asked Dec 11, 2018 by pady_1

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Which method of purification is represented by the following equation : $Ti(s) + 2I_2 (g) \xrightarrow{523 K} TiI_4 (g) \xrightarrow{1700 K} Ti(s) + 2I_2 (g)$

asked Dec 11, 2018 by pady_1

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Which among he following will be named as dibromidobis (ethylene diamine) chrominum (III) bromide ?

asked Dec 11, 2018 by pady_1

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Proton, Deuteron and alpha particle of the same kinetic energy are moving in circular trajectories in a constant magnetic field. The radii of proton, deuteron and alpha particle are respecctively $r_p$, $r_d$ and $r_{\alpha}$. Which one of the following relations is correct ?

asked Dec 11, 2018 by pady_1

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This question has statement 1 and statement 2. Of the four choices given after the statements, choose the one that best describes the two statements. An insulating solid sphere of radius R has a uniformly positive charge density $\rho$. As a result of this uniform charge distribution there is a finite value of electric potential at the centre of the sphere, at the surface of the sphere and also at a point out side the sphere. The electric potential at infinity is zero. Statement 1 : When a charge q is taken from the centre to the surface of the sphere, its potential energy changes by $\frac{qp}{3 \varepsilon_0}$ Statement 2 : The electric field at a distance r (r < R) from the centre of the sphere is $\frac{\rho r}{ 3 \varepsilon_0}$

asked Dec 11, 2018 by pady_1

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A spectrometer gives the following reading when used to measure the angle of a prism. Main scale reading : 58.5 degree Vernier scale reading : 09 divisions Given that 1 division on main scale corresponds to 0.5 degree. Total divisions on the vernier scale is 30 and match with 29 divisions of the main scale. The angle of the prism from the above data

asked Dec 11, 2018 by pady_1

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