Recent questions in JEEMAIN and NEET

The following mechanism has been proposed for the reaction of $NO$ with $Br_2$ to form $NOBr$ : $NO(g) + Br_2 (g) \rightleftharpoons NOBr_2 (g) $ $NOBr_2 (g) + NO (g) \to 2NOBr (g) $ If the second step is the rate determining step, the order of the reaction with respect to $NO (g)$ is :

asked Nov 13, 2018 by pady_1

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Given the data at $25^{\circ}C$, $Ag + I^- \to AgI + e^- ;\; \; \; E^{\circ} = 0.152 \;V$ $\;\;\;\;\;\;Ag \to Ag^+ + e^-; \; \; \; E^{\circ} = -0.800 \; V$ What is the value of $\log K_{sp}$ for $AgI$ ? $(2.303 \frac{RT}{F} = 0.059\;V)$

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Following statements regardinng the periodic trends of chemical reactivity of the alkali metals and the halogens are given. Which of these statements gives the correct picture ?

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The equilibrium constant for the reaction $SO_3 (g) \rightleftharpoons SO_2(g) + \frac{1}{2} O_2 (g)$ is $K_c = 4.9 \times 10^{-2}$. The value of $K_c$ for the reaction $2SO_2 (g) + O_2(g) \leftrightharpoons 2SO_3 (g)$ will be :

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The 'spin-only' magnetic moment [ in units of Bohr magneton, ($\mu_{\beta}$) ] of $Ni^{2+}$ in aqueous solution would be (Atomic number of Ni = 28) :

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The alkene formed as a major product in the above elimination reaction is :

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The decreasing values of bond angles from $NH_3 (107^{\circ})$ to $SbH_3 (91^{\circ})$ down group 15 of the periodic table is due to :

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The structure of the compound that gives a tribromo derivative on treatment with bromine water is :

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Increasing order of stability among the three main conformations (i.e., Eclipse, Anti, Gauche) of 2-fluoroethanol is :

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Reaction of trans-2-phenyl-1-bromocyclopentane on reaction with alcoholic KOH produces :

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The structure of the major product formed in the following reaction is :

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Rate of a reaction can be expressed by Arrhenius equation as : $k = Ae^{-E/RT}$ In this equation, $E$ represents :

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In Langmuir's model of adsorption of a gas on a solid surface :

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An ideal gas is allowed to expand both reversibly and irreversibly in an isolated system. If $T_i$ is the initial temperature and $T_f$ is the final temperature, which of the following statements is correct ?

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The increasing order of the first ionization enthalpies of the elements $B, \; P\; S$ and $F$ (lowest first) is :

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In $Fe(CO)s$, the $Fe-C$ bond possesses :

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Nickel ( Z = 28 ) combines with a uninegative monodentate ligand $X^-$ to form a paramagnetic complex $[NiX_4]^{2-}$. The number of unpaired electron(s) in the nickel and geometry of this complex ion are respectively :

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What products are expected from the disproportion reaction of hypochlorous acid ?

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In which of the following molecules / ions all the bonds are not equal ?

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The correct order of increasing acid strength of the compounds : (A) $CH_2CO_2H$ (B) $MeOCH_2CO_2H$ (C) $CF_3CO_2H$ (D) is :

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

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The molar conductivities $\bigwedge^{\circ} NaOAc$ and $ \bigwedge^{\circ} HCl$ at infinite dilution in water at $25^{\circ}C$ are $91.0$ and $426.2\; S\; cm^2/mol$ respectively. To calculate $ \bigwedge^{\circ} HOAc$, the additional value required is :

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Which of the following statement is true ?

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A metal, M forms chlorides in its $+2$ and $+4$ oxidation states. Which of the following statements about these chlorides is correct ?

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Fluorobenzene $(C_6H_5F)$ can be synthesized in the laboratory :

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Among the following mixtures, dipole - dipole as the major interaction, is present in :

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The standard enthalpy of formation $(\Delta H_f^{\circ})$ at 298 K for methane, $CH_4 (g)$, is $-74.8 \; kJ\;mol^{-1}$. The additional information required to determine the average energy for $C-H$ bond formation would be :

asked Nov 13, 2018 by pady_1

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Phosphorus pentacloride dissociates as follows, in a closed reaction vessel, $PCl_5 (g) \rightleftharpoons PCl_3 (g) + Cl_2(g) $ If total pressure at equilibrium of the reaction mixture is $P$ and degree of dissociation of $PCl_5$ is $x$, the partial pressure of $PCl_3$ will be :

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Uncertainty in the position of an electron (mass $9.1 \times 10^{-31} kg$) moving with a velocity $300\; ms^{-1}$, accurate upon $0.001 \%$ will be : ($ h = 6.63 \times 10^{-34} Js$)

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The increasing order of stability of the following free radicals is :

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Among the following the one that gives positive iodoform test upon reaction with $I_2$ and $NaOH$ is :

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The pyrimidine bases present in DNA are :

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$CH_3Br + Nu^- \to CH_3 - Nu + Br^-$ The decreasing order of the rate of the above reaction with nucleophiles $(Nu^-)$ A to D is : [$Nu^- = (A)\; PhO,\; (B)\; AcO^-,\; (C)\; HO^-\; (D)\; CH_3O$]

asked Nov 13, 2018 by pady_1

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Phenyl magnesium bromide reacts with methanol to give :

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In the transformation of $_{92}^{238}U$ to $_{92}^{234}U$, if one emission is an $\alpha$-particle, what should be the other emission (s) ?

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The term anomers of glucose refers to :

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The IUPAC name for the complex $[Co(NO_2)(NH_3)_5]Cl_2$ is :

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Which of the following chemical reactions depicts the oxidizing behaviour of $H_2SO_4$ ?

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A reaction was found to be second order with respect to the concentration of carbon monoxide. If the concentration of carbon monoxide is doubled, with everything else kept the same, the rate of reaction will :

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Total volume of atoms present in a face-centred cubic unit cell of a metal is (r is atomic radius) :

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Which of the following molecules/ions does not contain unpaired electrons ?

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According to Bohr's theory, the angular momentum of an electron in 5th orbit is :

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How many moles of magnesium phosphate, $Mg_3 (PO_4)_2$ will contain 0.25 mole of oxygen atoms ?

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The increaing order of the rate of HCN addition to compound A-D is : (A) $HCHO$ (B) $CH_3COCH_3$ (C) $PhCOCH_3$ (D) $PhCOPh$

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The IUPAC name of the compound shown below is :

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$HBr$ reacts with $CH_2 = CH - OCH_3$ under anhydrous conditions at room temperature to give :

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If the terminal speed of a sphere of gold (density = $19.5 \; kg/m^3$) is $0.2 \; m/s$ in a viscous liquid (density = $1.5\; kg/m^3$), find the terminal speed of a sphere of silver (density = $10.5 \; kg/m^3$) of the same size in the same liquid.

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The rms value of the electric field of the light coming from the Sun is 720 N/C. The average total energy density of the electromagnetic wave is :

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If the lattice constant of this semiconductor is decreased, then which of the following is correct ?

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The work of 146 kJ is performed in order of compress one kilo mole of a gas adiabatically and in this process the temperature of the gas increases by $7^{\circ}C$. The gas is : ($R = 8.3 \; J\; mol^{-1} K^{-1}$)

asked Nov 13, 2018 by pady_1

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