Recent questions tagged neet

Which one of the following monomers gives the polymer neoprene on polymerization : -

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A and B in the following reactions are :

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Acrolein is a hard, horny and a high melting point material. Which of the following represent its structure :

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Which of the following orders of acid strength is correct :

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The correct order of reactivity towards the electrophilic substitution of the compounds aniline (I), benzene (II) and nitrobenzene (III) is

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When m-chlorobenzaldehyde is treated with 50% KOH solution, the product(s) obtained is (are)

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The final product C, obtained in this reaction, would be : <img src =""/>

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Which one of the following is a free-radical substitution reaction :

asked Jul 24, 2018 by pady_1

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The radioisotope, tritium ($ ^3_1H$) has a half-life of 12.3 years. If the initial amount of tritium is 32 mg, how many milligrams of its would remain after 49.2 years :

asked Jul 24, 2018 by pady_1

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Among the following which is not the $\pi$-bonded organometallic compound :

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Vitamin $B_{12}$ contains :

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Which one of the following octahedral complexes will not show geometric isomerism ? (A and B are monodentate ligands)

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The number of unpaired electrons in the complex ion $[CoF_6]^{3–}$ is : (Atomic No. of Co = 27)

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According to IUPAC nomenclature sodium nitroprusside is named as :

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The correct order of ionic radii of $Y^{3+}, La^{3+}, Eu^{3+}$, and $Lu^{3+}$ is : -

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The basic character of the transition metal monoxides follows the order : $(Atomic \; nos. Ti = 22, V = 23, Cr = 24, Fe = 26)$

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Which one of the following characteristics of the transition metals is associated with their catalytic activity :

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According to the adsorption theory of catalysis, the speed of the reaction increase because :

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The e.m.f. of a Daniell cell at 298 K is $E_1$. $Zn/SO_4(0.01 M) || CuSO_4(1.0 M)/Cu$ When the concentration of $ZnSO_4$ is 1.0 M and that of $CuSO_4$ is 0.01 M, the e.m.f. is changed to $E_2$. What is the relationship between $E_1$ and $E_2$ :

asked Jul 24, 2018 by pady_1

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The compound <img src = " "/> on reaction with $NaIO_4$ in the presence of $KMnO_4$ given :

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In a set of th given reaction, acetic acid yielded a product C. $CH_3COOH +PCl_5 \to A \xrightarrow[\text{Anh. $AlCl_3$}]{\text{$C_6H_6$}} B \xrightarrow[\text{ether}]{\text{$C_2H_5MgBr$} } C \; \text{, product C would be }$

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Which of the following pairs of compounds are enantiomers :

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In this reaction : $CH_3CHO + HCN \to CH_3CH(OHCN) \overset{H.OH}{\rightarrow} CH_3CH(OH)COOH$ an asymmetric centre is generated. The acid obtained would be :

asked Jul 24, 2018 by pady_1

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IUPAC name of the compound given below is :

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The temperature dependence of rate constant $(k)$ of a chemical reaction is written in terms of Arrhenius equation, $k = A.e^{–E^/RT}$. Activation energy $(E^)$ of the reaction can be calculated by plotting

asked Jul 24, 2018 by pady_1

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The molar heat capacity of water at constant pressure, C, is $75 \;JK^{–1} mol^{–1}$. When 1.0 KJ of heat is supplied to 100 g of water which is free to expand, the increase in temperature of water is :

asked Jul 24, 2018 by pady_1

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The molar heat capacity of water at constant pressure, C, is $75 \;JK^{–1} mol^{–1}$. When 1.0 KJ of heat is supplied to 100 g of water which is free to expand, the increase in temperature of water is :

asked Jul 24, 2018 by pady_1

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The following equilibria are given : <img src = ""/>

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For which one of the following equations is $\Delta H^{\circ}_{react}$ equal to $\Delta H^o_f$ for the product :

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Formation of a solution from two components can be considered as : (i) Pure solvent $\to$ separated solvent molecules, $ \Delta H_1$ (ii) Pure solvent $\to$ separated solvent molecules, $ \Delta H_2$ (iii) Separated solvent and solute molecules $\to$ solution, $\Delta H_3$ Solution so formed will be ideal if : -

asked Jul 24, 2018 by pady_1

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The solubility product of AgI at $25^oC$ is $1.0 \times 10^{–16} mol^2 L^{–2}$. The solubility of AgI in $10^{–4} N$ solution of KI at $25^oC$ is approximately (in $mol\; L^{–1}$) :

asked Jul 24, 2018 by pady_1

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The reaction A $\to$ B follows first order kinetics. The time taken for 0.8 mole of A to produce 0.6 mole of B is 1 hour. What is the time taken for conversion of 0.9 mole of A to produce 0.675 mole of B

asked Jul 24, 2018 by pady_1

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On the basis of the information available from the reaction : $\frac{4}{3} Al + O_2 \to \frac{2}{3} Al_2O_3, \Delta G = -827 \;KJ \; mol^{-1}$ of $O_2$, the minimum e.m.f required to carry out electrolysis of $Al_2O_3$ is $(F = 96500 \; C\; mol^{-1})$

asked Jul 24, 2018 by pady_1

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The method of zone refining of metals is based on the principle of :

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Which of the following statements is not true :

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The activation energy for a simple chemical reaction $A \to B$ is $E_a$ in forward direction. The activation energy for reverse reaction :

asked Jul 24, 2018 by pady_1

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The reaction quotient (Q) for the reaction : <img src =""/> is given by $Q = \frac{[NH_3]^2}{[N_2] [H_2]^3}$. The reaction will proceed from right to left if : (where $K_C$ is the equilibrium constant )

asked Jul 24, 2018 by pady_1

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What is the entropy change (in $JK^{–1} mol^{–1}$) when one mole of ice is converted into water at $0^oC$ ? (The enthalpy change for the conversion of ice to liquid water is $6.0 \;KJ\; mol^{–1}\; at \;0^oC$)

asked Jul 24, 2018 by pady_1

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The densities of graphite and diamond at $298 K$ are $2.25$ and $3.31 g\; cm^{–3}$, respectively. If the standard free energy difference ($\Delta G^o$) is equal to $1895 J \;mol^{–1}$, the pressure at which graphite will be transformed into diamond at $298 K$ is -

asked Jul 24, 2018 by pady_1

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In Haber process 30 litres of dihydrogen and 30 litres of dinitrogen were taken for reaction which yielded only 50% of the expected product. What will be the composition of gaseous mixture under the above condition in the end :

asked Jul 24, 2018 by pady_1

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For the reaction : $C_3H_8(g) + 5O_2 (g) \to 3CO_2(g) + 4H_2O(l)$ at constant temperature, $\Delta H - \Delta E$ is :

asked Jul 24, 2018 by pady_1

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The pyknometric density of sodium chloride crystal is $2.165 \times 10^3 kg\; m^{–3}$ while its X-ray density is $2.178 \times 10^3 kg \; m^{–3}$. The fraction of unoccupied sites in sodium chloride crystal is :

asked Jul 24, 2018 by pady_1

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The oxidation states of sulphur in the anions $SO_3^{2–}, S_2O_4^{2–}$ and $S_2O_6^{2–}$ follow the order -

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Which of the following statements is not correct for sigma- and pi- bonds formed between two carbon atoms :

asked Jul 24, 2018 by pady_1

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The value of Planck's constant is $6.63 \times 10^{–34}Js$. The velocity of light is $3.0 \times 10^8 ms^{–1}$. Which value is closest to the wavelength in nanometers of a quantum of light with frequency of $8 \times 10^{15} s^{–1}$ :

asked Jul 24, 2018 by pady_1

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Which one of the following compounds is not a protonic acid :

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The ions $O^{2-} , F^-, Na^+, Mg^{2+}$ and $Al^{3+}$ are isoelecronic. Their ionic radii show :

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Following diagram performs the logic function of :

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A nuclear reaction given by $_ZX^A \to _{Z + 1}Y^A + _{–1}e ^0 + \overline{v}$ represents

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The mass number of a nucleus is

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