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Recent questions tagged class11

The correct acidity order of the following is :

asked Feb 24, 2014 by meena.p

1 answer

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

1 answer

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

1 answer

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

1 answer

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

1 answer

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

asked Feb 24, 2014 by meena.p

1 answer

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

1 answer

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

1 answer

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

1 answer

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

1 answer

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

1 answer

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

1 answer

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

1 answer

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

1 answer

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

1 answer

Insert $5$ numbers between $8\:and\:26$ such that the resulting sequence is an $A.P.$

asked Feb 23, 2014 by rvidyagovindarajan_1

1 answer

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

1 answer

If the sum of $n$ terms of an $A.P.$ is $3n^2+5n$ and its $m^{th}$ term is $164$, find the value of $m$.

asked Feb 23, 2014 by rvidyagovindarajan_1

1 answer

The ratio of the sums of $m\:\:and\:\:n$ terms of an $A.P.$ is $m^2:n^2$. Show that the ratio of $m^{th}\:and\:n^{th}$ term is $(2m-1):(2n-1)$

asked Feb 23, 2014 by rvidyagovindarajan_1

1 answer

Sum of first $p,q\:\:and\:\:r\:terms$ of an $A.P.$ are $a,b\:\:and\:\:c$ respectively. Prove that $\large\frac{a}{p}$$(q-r)+\large\frac{b}{q}$$(r-p)+\large\frac{c}{r}$$(p-q)=0$

asked Feb 23, 2014 by rvidyagovindarajan_1

1 answer

If the sum of first $p$ terms of an $A.P.$ is equal to sum of first $q$ terms, then find the sum of first $p+q$ terms of the $A.P.$

asked Feb 23, 2014 by rvidyagovindarajan_1

1 answer

The sum of $n$ terms of two $A.P.s$ are in the ratio $5n+4:9n+6$ Find the ratio of their $18^{th}$ terms.

asked Feb 22, 2014 by rvidyagovindarajan_1

1 answer

If the sum of $n$ terms of an $A.P.$ is $(pn+qn^2)$ where $p$ and $q$ are constants, then find the common difference $d$.

asked Feb 22, 2014 by rvidyagovindarajan_1

1 answer

Which of the following have asymmetric carbon atom ?

asked Feb 22, 2014 by meena.p

1 answer

Find the sum of $n$ terms of an $A.P.$ whose $k^{th}$ term is $5k+1$

asked Feb 22, 2014 by rvidyagovindarajan_1

1 answer

The order of reactivitiesof the following alkyl halides for a $Sn^2$ reaction is

asked Feb 22, 2014 by meena.p

1 answer

The compound which is not isomeric with diethyl ether is

asked Feb 22, 2014 by meena.p

1 answer

Which of the following compounds will exhibit cis-trans (geometrical ) isomerism ?

asked Feb 22, 2014 by meena.p

1 answer

Out of the following compounds , which will be have a zero dipole moment.

asked Feb 22, 2014 by meena.p

1 answer

Identify the correct order of reactivity in electrophilic substitution action of the following compounds.

asked Feb 22, 2014 by meena.p

1 answer

The bond between carbon atom (1) and carbon atom (2) in compound $N \equiv C_{(1)} -CH_{(2)}H \equiv CH_2$ involves the hybrid as

asked Feb 22, 2014 by meena.p

1 answer

The $Cl-C-Cl$ angle in $1,1,2,2$- tetracholoroethene and tetrachloromethane respectively will be about

asked Feb 22, 2014 by meena.p

1 answer

The correct stability order of te following resonance structures is $ I:H_2C= N^+=\bar{N} ; \quad II:H_2C^+ - N=\bar{N} \quad ; III:H_2C - N^+=\bar{N} \quad ; IV:H_2 \bar{C}- N=N^+$

asked Feb 22, 2014 by meena.p

1 answer

What is the decreasing order of strength of the bases $OH^-,NH_2^-,H-C \equiv C^- $ and $CH_3 ^{-}CH_2^-$?

asked Feb 22, 2014 by meena.p

1 answer

An $SN^2$ reaction at an asymmetric carbon a compound always gives,

asked Feb 22, 2014 by meena.p

1 answer

In the following groups : $I\; - OAc ; \;\; II \; -OMe ; \; III \;-OSO_2 Me\; ; (IV) \; -OSO_2 CF_3$ the order of leaving groups ability is

asked Feb 21, 2014 by meena.p

1 answer

Allyl isocynide has

asked Feb 21, 2014 by meena.p

1 answer

Which of the following hydrocarbons has the lowest dipole moment?

asked Feb 21, 2014 by meena.p

1 answer

The products of combustion of an aliphatic thiol (RSH) at 298 k are

asked Feb 21, 2014 by meena.p

1 answer

The hybridisation of carbon atoms in $C-C$ single bond of $HC \equiv C-CH = CH_2$ is

asked Feb 21, 2014 by meena.p

1 answer

The number of sigma and pi-bonds in 1-butene -3-yne are

asked Feb 21, 2014 by meena.p

1 answer

The optically active tartaric acid named as $D-(+)-$ tartaric acid because it has a positive,

asked Feb 21, 2014 by meena.p

1 answer

Among the given compounds, the most susceptible to nucleophilic attack at the carbonyl group is

asked Feb 21, 2014 by meena.p

1 answer

The structure shows:

asked Feb 21, 2014 by meena.p

1 answer

The IUPAC name of $C_6H_5COCl$ is

asked Feb 21, 2014 by meena.p

1 answer

The IUPAC name of the following compound

asked Feb 21, 2014 by meena.p

1 answer

Calculate the average volume available to a molecule in a sample of nitrogen gas at STP. What is the average distance between neighbouring molecules if nitrogen molecules are spherical in nature?

asked Feb 21, 2014 by sharmaaparna1

1 answer

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