Recent questions tagged chemistry

Choose the correct statement from the following :

asked Nov 20, 2013 by thanvigandhi_1

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1,3-Butadiene and styrene on polymerisation give :

asked Nov 20, 2013 by thanvigandhi_1

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What are A,B and C in the following reactions ?

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Whar are A,B and C in the following reactions ?

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Which one of the following is one of the cross end products formed when a mixture of acetone and acetaldehyde is heated after treating with aqueous sodium hydroxide ?

asked Nov 20, 2013 by thanvigandhi_1

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Which one of the following compounds is steam distillable ?

asked Nov 20, 2013 by thanvigandhi_1

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Chloroform when heated with silver powder gives :

asked Nov 20, 2013 by thanvigandhi_1

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Which one of the following is not having two chiral centres ?

asked Nov 20, 2013 by thanvigandhi_1

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Which one of the following compounds is formed when nitrobenzene is treated with bromine in the presence of ferric ion ?

asked Nov 20, 2013 by thanvigandhi_1

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The product obtained when propene undergoes addition reaction with HBr in the presence of benzoyl peroxide is :

asked Nov 20, 2013 by thanvigandhi_1

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In IUPAC name of

asked Nov 20, 2013 by thanvigandhi_1

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Ozone layer is present in :

asked Nov 20, 2013 by thanvigandhi_1

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The processes used in the refining of aluminium and zinc metals are respectively :

asked Nov 20, 2013 by thanvigandhi_1

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One mole of $ CoCI_3, YNH_3$ complex compound on complete ionisation in water produce three moles of ions. If one chloride satisfies both primary and secondary valencies of cobalt ion, the value of Y is :

asked Nov 20, 2013 by thanvigandhi_1

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The shape of $ XeF_6$ is :

asked Nov 20, 2013 by thanvigandhi_1

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The order of bond energies in halogen molecules is :

asked Nov 20, 2013 by thanvigandhi_1

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The oxidation numbers of sulphur in $ S_8,SO_2\: and \: H_2S$ respectively are :

asked Nov 20, 2013 by thanvigandhi_1

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In $P_4O_{10}$ , the number of oxygen atoms bonded to each phosphorous atom is :

asked Nov 20, 2013 by thanvigandhi_1

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A and B are the compounds of carbon. A on passing over red hot coke is converted to B. Then A and B are respectively :

asked Nov 20, 2013 by thanvigandhi_1

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Aluminium metal becomes passive in :

asked Nov 20, 2013 by thanvigandhi_1

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Match the following

asked Nov 20, 2013 by thanvigandhi_1

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Which of the following statement is incorrect ?

asked Nov 20, 2013 by thanvigandhi_1

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What is the emulsifier in milk ?

asked Nov 20, 2013 by thanvigandhi_1

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Heat of formation of $ CO\: and \: CO_2 $ are - 26.4 and -94.0 kcal/mole respectively. What is the heat of combustion of $CO$ in kcals ?

asked Nov 20, 2013 by thanvigandhi_1

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Assertion (A) : According to Lowry-Bronsted theory, a substance can function as an acid as well as a base. Reasons (R) : Acid reacts with a base to produce a salt.

asked Nov 20, 2013 by thanvigandhi_1

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What is the effect of a ten-fold increase in pressure on $k_p$ in the reaction $ N_2(g)\: 3H_2(g) \: \leftrightharpoons \: 2\: NH_3 (g) $ at equilibrium ?

asked Nov 20, 2013 by thanvigandhi_1

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For the reaction $A+3b \rightarrow 2C+D$, which one of the following is not correct?

asked Nov 20, 2013 by thanvigandhi_1

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A crystalline solid substance has a density of $10 g/cm^3$ and the length of the edge of the unit cell (FCC) is 2.0 A. How many number of atoms are present in 200 grams of the solid ?

asked Nov 20, 2013 by thanvigandhi_1

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What is the e.m.f of the cell for the reaction $ Fe^{2+} + Zn \rightarrow Zn^{2+} + Fe$ ? Given that $ E^0_{Zn|Zn^{2+}(1.0M) }=0.76\: V \: and \: E^0_{Fe|Fe^{2+}(1.0M) }=0.41\: V $

asked Nov 20, 2013 by thanvigandhi_1

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If the solution of copper sulphate in which a copper rod is immersed, is diluted 100 times, what is the change in electrode potential ( Reduction ) ?

asked Nov 20, 2013 by thanvigandhi_1

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What is the volume of $ 0.1\: M \: H_2SO_4$ required in litres to neutralize completely 1 litre of a solution containing 20 g of $NaOH$ ?

asked Nov 20, 2013 by thanvigandhi_1

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Which one of the following $ 1.0 \times 10^{-3}$ molal aqueous solutions has the highest boiling point ?

asked Nov 20, 2013 by thanvigandhi_1

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Equal weights of Methane and Oxygen are mixed in an empty container at $25^{\circ}C$. The fraction of the total pressure exerted by Oxygen is :

asked Nov 20, 2013 by thanvigandhi_1

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0.14 g of an element on combustion gives 0.28 g of its oxide. What is that element ?

asked Nov 20, 2013 by thanvigandhi_1

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Molecular orbital theory was proposed by:

asked Nov 20, 2013 by thanvigandhi_1

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The correct order of magnitude of bond angles among the compounds $ CH_4, NH_3 \: and \: H_2O$ is:

asked Nov 18, 2013 by thanvigandhi_1

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The incorrect order of second ionization energies in the following is :

asked Nov 18, 2013 by thanvigandhi_1

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In a hydrogen atom, the electron is at a distance of 4.768 A from the nucleus. The angular momentum of the electron is :

asked Nov 18, 2013 by thanvigandhi_1

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The radial probability distribution curve obtained for an orbital wave function $ \Psi $ has 3 peaks and 2 radial nodes. The valence electron of which one of the following metals does this wave function $ ( \Psi )$ correspond to ?

asked Nov 18, 2013 by thanvigandhi_1

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Given $NaSO_4.10H_2O (s) \rightleftharpoons NaSO_4 (s) + 10H_2O (g) ; K_p =4.08 \times 10^{-25} $ and vapour pressure of water at $0^\circ$C = 4.58 Torr. At what relative humidity will $Na_2SO_4$ be deliquescent when exposed to the air at $0^\circ$C ?

asked Nov 15, 2013 by mosymeow_1

1 answer

For the equilibrium $2SO_2 + O_2 \rightleftharpoons 2SO_3$ we start with 2 moles of $SO_2$ and 1 mole of $O_2$ at 3 atm. When equilibrium is attained, pressure changes to 2.5 atm. Hence, $K_p$ is:

asked Nov 15, 2013 by mosymeow_1

1 answer

For a very small extent of dissociation of $PCl_5(g) \rightleftharpoons PCl_3(g) + Cl_2(g)$ is a gaseous phase reaction then degree of dissociation, x:

asked Nov 15, 2013 by mosymeow_1

1 answer

$PCl_5(g) \rightleftharpoons PCl_3(g) + Cl_2 (g)$ In the dissociation of $PCl_5, x $ varies with $\frac{D}{d}$ according to:

asked Nov 15, 2013 by mosymeow_1

1 answer

For the reversible reaction equilibrium is $ N_2(g) + O_2(g) \overset{\overset{k_r}{\rightleftharpoons}}{_{k_f}} 2NO(g), $ $C_0 = Ce^{-2.1 \times 10^{-3} t} $ for the forward reaction and $C'_0 = C'e^{-4.2 \times 10^{-4}} t$ for the backward reaction, hence, if both forward and backward reactions are first order reactions then $K_c$ for the above equilibrium is:

asked Nov 15, 2013 by mosymeow_1

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$ Solute + H_2O \rightleftharpoons solution; \Delta H=\pm x $ For the given equation, Solubility(S) of a solute in the solvent (say $H_2O$) is given by $S = A e^{-\frac{\Delta H}{RT}}$ For a given solution, variation of log S with temperature is shown graphically. Hence, Solute is:

asked Nov 15, 2013 by mosymeow_1

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$A + B \rightleftharpoons C + D$ One mole each of A and B and 3 moles each of C and D are placed in 1L flask, if equilibrium constant is 2.25. Equilibrium concentrations of A and C will be in the ratio:

asked Nov 15, 2013 by mosymeow_1

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Volume of the flask in which species are transferred is double of the earlier flask. In which of the following reversible reactions, equilibrium will be shifted in the forward direction?

asked Nov 15, 2013 by mosymeow_1

1 answer

$ I_2 + I^- \rightleftharpoons I^-_3 $ This reaction is set-up in aqueous medium. Initially we have 1 mole of $I_2$ and 0.5 mole of $I^-$ in 1 L flask. After equilibrium is reached, excess of $AgNO_3$ gave 0.25 mole of yellow ppt. Equilibrium constant is

asked Nov 15, 2013 by mosymeow_1

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We know that equilibrium constant, K changes with temperature. At 300K, equilibrium constant is 25 and at 400K it is 10. Hence, backward reaction will have energy of activation:

asked Nov 15, 2013 by mosymeow_1

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Given a reaction $ A + B \rightleftharpoons C + D $ taking place in a 1L vessel. If we start with 1 mole each of A and B, equilibrium concentration of [C] = [D] = 0.5 M. Percentage of A converted into C if we start with 2 moles of A and 1 mole of B, is

asked Nov 15, 2013 by mosymeow_1

1 answer

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