Recent questions in Chemistry

The heat change at constant volume for the decomposition of silver(I) oxide is found to be 30.66 kJ. The heat change at constant pressure will be

asked Feb 24, 2014 by mosymeow_1

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At 298 K, the enthalpy change for a given reaction K is $-x$ cal/mol. If the reaction occurs spontaneously at 298 K, the entropy change at that temperature

asked Feb 24, 2014 by mosymeow_1

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Arrange in order of decreasing trend towards ES (electrophilic substitution) reactions: Chlorobenzene (I), Benzene (II), Anilinium chloride (III), Toluene (IV)

asked Feb 24, 2014 by meena.p

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For the following thermodynamic process Dry ice $\longrightarrow CO_2$ (g)

asked Feb 24, 2014 by mosymeow_1

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The sign of $\Delta G$ for the process of melting of ice at 273 K and 1 atm pressure is

asked Feb 24, 2014 by mosymeow_1

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According to third law of thermodynamics, the entropy at 0 K is zero for

asked Feb 24, 2014 by mosymeow_1

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The value of $\Delta S$ is negative in which of the following process?

asked Feb 24, 2014 by mosymeow_1

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For the gaseous reaction involving the complete combustion of isobutane

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Among the following , the molecule with the highest dipole moment is :

asked Feb 24, 2014 by meena.p

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The correct stability order for the following species is

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The major product formed in the reaction given below is

asked Feb 24, 2014 by sreemathi.v

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In the following compounds?

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Among the following molecules:The increasing order of rate of cannizzaro reaction is

asked Feb 24, 2014 by sreemathi.v

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What is the major product in the following reaction:

asked Feb 24, 2014 by sreemathi.v

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Give the numbers of N and M?

asked Feb 24, 2014 by meena.p

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The correct acidity order of the following is :

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Predict the product in the below reaction:

asked Feb 24, 2014 by sreemathi.v

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In the following carbocation, $H/CH_3$ that most likely to migrate to the positively charged carbon is .

asked Feb 24, 2014 by meena.p

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In the following reaction

asked Feb 24, 2014 by sreemathi.v

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The major product of the following reaction is

asked Feb 24, 2014 by sreemathi.v

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In the below reaction :The product X is

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What would be the major product of the following reaction?

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The density of cr atoms is 7.2g/cm. If the unit cell has edge length 289 pm. Calculate the number of chromium atoms per unit cell. (at mass of cr = 52)

asked Feb 24, 2014 by sharmaaparna1

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The approriate reagents for the following transformation?

asked Feb 24, 2014 by sreemathi.v

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Ice crystallizes in hexagonal lattice. At the low temperature at which structure was determined the lattice constants were $a = 4.53A^{\large\circ}$ and C = $b = 7.41A^{\large\circ}$ .Calculate the no. of $H_2O$ molecules present in a unit cell. (Density of ice = 0.92g/cm)

asked Feb 24, 2014 by sharmaaparna1

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A compound $AB_x$ is formed such that A atoms are at corners and B atoms at face centre. Find the value of $x$ .

asked Feb 24, 2014 by sharmaaparna1

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In the below reaction :

asked Feb 24, 2014 by sreemathi.v

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Chromium metal crystallizes with a b.c.c lattice. The edge length of the unit cell is found to be 287pm. Calculate the density of chromium in $g\;cm^{-3}$(at weight of cr = 52).

asked Feb 24, 2014 by sharmaaparna1

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A molecule $A_2B$(mol.weight = 166.4) occupies triclinic lattice with a = 5A , b = 8A and C = 4A . If density of $AB_2$ is $5.2g cm^{-3}$. Calculate the number of molecules present in one unit cell.

asked Feb 24, 2014 by sharmaaparna1

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What would be the product of the following reaction?

asked Feb 24, 2014 by sreemathi.v

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Product of below reaction will be

asked Feb 24, 2014 by sreemathi.v

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The product of the below reaction:

asked Feb 24, 2014 by sreemathi.v

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In the following reaction the major product formed is a

asked Feb 24, 2014 by sreemathi.v

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Which is a product of Y of the following reaction:

asked Feb 24, 2014 by sreemathi.v

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Which of the following resonating structures of $1-methoxy -1, 3- butadiene$ is least stable?

asked Feb 24, 2014 by meena.p

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Arrange the following compounds in order of increasing dipole moment:- Toluene (I) ; m-dichorobenzene (II) ;o-dichlorobenzene (III) ; p- dichlorobenzene.(IV)

asked Feb 24, 2014 by meena.p

1 answer

The number of isomers for the compound with molecular $C_2BrClFI$ is :

asked Feb 24, 2014 by meena.p

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Enthalpy of neutralisation of all strong acids and strong bases has the same value because

asked Feb 23, 2014 by mosymeow_1

1 answer

One gram of diamond atom of graphite and one gram atom of diamond were separately burnt to carbon dioxide. The amount of heat liberated were 393.5 kJ and 395.4 kJ respectively. It follows that

asked Feb 23, 2014 by mosymeow_1

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A cylinder container with the moveable piston initially hold 3.0 mole of a gas at 8.0 atm pressure and a volume of 5.0 litre. If piston is moved to create a volume 10.0 litre , while simultaneously with drawing 1.5 mole of gas. Calculate the final pressure.

asked Feb 23, 2014 by sharmaaparna1

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X gm of ethanal was subjected to combustion in a bomb calorimeter. The heat produced is Y joules. Then

asked Feb 23, 2014 by mosymeow_1

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The reaction $SO_2(g) + \frac{1}{2} O_2 (g) \longrightarrow SO_3(g)$ should be

asked Feb 23, 2014 by mosymeow_1

1 answer

Which of the following relationship is not correct?

asked Feb 23, 2014 by mosymeow_1

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At constant volume the heat of combustion of solid benzoic acid is -321.30 kJ at $27^\circ C$. The heat of combustion at constant pressure is

asked Feb 23, 2014 by mosymeow_1

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An L.P.G Cylinder contains 15kg of butane gas at $27^{\large\circ}C$ and 10 atm pressure. It was leaking and its pressure fell down to 8 atm pressure after one day. Calculate the amount of leaked gas.

asked Feb 23, 2014 by sharmaaparna1

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Density of a gas is found to be $5.46g/dm^3$ at $27^{\large\circ}C$ at 2 bar pressure. What will be its density at STP?

asked Feb 23, 2014 by sharmaaparna1

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What is observed during isothermal expansion of an ideal gas?

asked Feb 23, 2014 by mosymeow_1

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When is the efficiency of a heat engine maximum?

asked Feb 23, 2014 by mosymeow_1

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A 40 mL of a mixture of $H_2O$ and $O_2$ was placed in a gas burette at $18^{\large\circ}C$ and 1 atm P. A spark was applied so that the form a pure gas had a volume of 10mL at $18^{\large\circ}C$ and 1 atm P . If the remaining gas was $H_2$, what was the initial mole $\%$ of $H_2$ in mixture?

asked Feb 23, 2014 by sharmaaparna1

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Calculate the percentage of free volume available in 1 mole gaseous water at 1.0atm and $100^{\large\circ}C$. Density of liquid $H_2O$ at $100^{\large\circ}C$ is 0.958 g/mL.

asked Feb 23, 2014 by sharmaaparna1

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