Recent questions in JEEMAIN and NEET

Reaction of one molecule of HBr with one molecule of 1, 3-butadiene at $40^{\circ} C$ gives predominantly :

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A photon of hard gamma radiation knocks a proton out of $^{24}_{12} Mg$ nucleus to form :

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The best reagent to convert pent-3-en-2-ol into pent-3-en-2-one is :

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Which one of the following cyano complexes would exhibit the lowest value of paramagnetic behaviour ? (Atomic no. Cr = 24, Mn = 25, Fe = 26, Co = 27 )

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Which of the following compounds shows optical isomerism ?

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2-methylbutane on reacting with bromine in the presence of sunlight gives mainly :

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Of the following sets which one does not contain isoelectronic species ?

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In which of the following arrangements the order is not according to the property indicated against it ?

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The IUPAC name of the co-ordination compound $K_3[Fe(CN)_6]$ is :

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The lanthanide contraction is responsible for the fact that :

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In silicon dioxide :

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The oxidation state of chromium in the final product formed by the reaction between $KI$ and acidified potassium dichromate solution is :

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The number and type of bonds between two carbon atoms in calcium carbide are :

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Calomel $(Hg_2Cl_2)$ on reaction with ammonium hydroxide gives :

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The correct order of the thermal stability of hydrogen halides (H-X) is :

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Heating an aqueous solution of aluminium chloride to dryness will give :

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What is the conjugate base of $OH^-$ ?

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The number of hydrogen atom(s) attached to phosphorus atom in hypophosphorous acid is :

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The disperse phase in colloidal iron (III) hydroxide and colloidal gold is positively and negatively charged, respectively. Which of the following statements is not correct ?

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The molecular shapes of $SF_4, CF_4 $ and $XeF_4$ are :

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Heating mixture of $Cu_2O$ and $Cu_2S$ will give

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A schematic plot of $ln \;K_{eq}$ versus inverse of temperature for a reaction is shown below : The reaction must be :

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Based on lattice energy and other considerations which one of the following alkali metal chlorides is expected to have the highest melting point ?

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In a multi-electron atom, which of the following orbitals described by the three quantum numbers will have the same energy in the absence of magnetic and electric fields ? (A) $n = 1, l =0, m =0$ (B) $n = 2, l = 0, m = 0$ (C) $n = 2, l = 1, m = 1 $ (D) $n = 3, l = 2, m = 1$ (E) $n = 3, l = 2, m = 0 $

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If we consider that 1/6, in place of 1/12, mass of carbon atom is taken to be the relative atomic mass unit, the mass of one mole of a substance will :

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Calculate $\land^{\infty} HOAc$ using appropriate molar conductances of the electrolytes listed above at infinite dilution in $H_2O$ at $25^{\circ} C$ :

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During the process of electrolytic refining of copper, some metals present as impurity settle as 'anode mud'. These are :

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Two solutions of a substance (non electrolyte) are mixed in the following manner. 480 mL of 1.5 M first solution + 520 mL of 1.2 M second solution. What is the molarity of the final mixture ?

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A reaction involving two different reactants can never be

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Hydrogen ion concentration in mol/L in a solution of pH = 5.4 will be :

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The exothermic formation of $ClF_3$ is represented by the equation : $Cl_2 (g) + 3F_2 (g) \leftrightharpoons 2 ClF_3 (g); \Delta Hr = -329 kJ$. Which of the following will increase the quantity of $ClF_3$ in an equilibrium mixture of $Cl_2, F_2 $ and $ClF_3$?

asked Nov 5, 2018 by pady_1

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For the reaction $2NO_2 (g) \rightleftharpoons 2 NO (g) + O_2(g)$ ($K_c = 1.8 \times 10^{-6}$ at $ 184^{\circ} $ C ) ($R = 0.00831\; k J/(mol.K)$ ) When $K_p$ and $K_c$ are compared at $184^{\circ} C$ it is found that :

asked Nov 5, 2018 by pady_1

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Which one of the following statements is not true about the effect of an increase in temperature on the distribution of molecular speeds in a gas ?

asked Nov 5, 2018 by pady_1

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Benzene and toluene form nearly ideal solutions. At $20^{\circ}C$, the vapour pressure of benzene is 75 torr and that of toluene is 22 torr. The partial vapour pressure of benzene at $20^{\circ} C$ for a solution containing 78 g of benzene and 46 g of toluene in torr is :

asked Nov 5, 2018 by pady_1

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The solubility product of a salt having general formula $MX_2$, in water is $4 \times 10^{-12}$. The concentration od $M^{2+}$ ions in the aqueous solution of the salt is :

asked Nov 5, 2018 by pady_1

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Consider the reaction : $N_2 + 3H_2 \to 2NH_3$ carried out at constant temperature and pressure. If $\Delta H$ and $\Delta U$ are the enthalpy and internal energy changes for the reaction, which of the following expressions is true ?

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The volume of a colloidal particle, $V_C$ as compared to the volume of a solute particle in a true solution $V_S$ could be :

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Aluminium oxide may be electrolysed at $1000^{\circ} C$ to furnish aluminium metal (Atomic mass =27 amu; 1 faraday= 96,500 Coulombs). The cathode reaction is $Al^{3+} + 3e^- \to Al^0$ To prepare 5.12 Kg of aluminium metal by this method would require :

asked Nov 5, 2018 by pady_1

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Consider an endothermic reaction $X \to Y$ with the activation energies $E_b$ and $E_f$ for the backwarrd and forward reactions respectively. In general :

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Lattice energy of an ionic compound depends upon :

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The highest electrical conducitivity of the following aqueous solutions is of :

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An ionic compound has a unit cell consisting of A ions at the corners of a cube and B ions on the centres of the faces of the cube. The empirical formula for this compound would be :

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Hydrogen bomb is based on the principle of :

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For a spontaneous reaction the $\Delta G$, equilibrium constant $(K)$ and $E_{cell}^{\circ}$ will be respectively :

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Due to the presence of an unpaired electron free radicals are :

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Which of the following is a polyamide ?

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If $\alpha$ is the degree of dissociation of $Na_2SO_4$, the van't Hoff factor ($i$) used for calculating the molecular mass is :

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Which one of the following species is diamagnetic in nature ?

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Which of the following oxides is amphoteric in character ?

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Which one of the following types of drugs reduces fever ?

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