Recent questions tagged class11

The following table lists the bond dissociation energy ($E_{diss}$) for single covalent bonds formed between C and atoms A, B, D, E. Which of the atoms has smallest size?

asked Feb 25, 2014 by mosymeow_1

1 answer

Which term of the sequence $2,2\sqrt 2,4,.......\:\:is\:\:128?$

asked Feb 25, 2014 by rvidyagovindarajan_1

1 answer

The $4^{th}$ term of a G.P. is square of its second term, and the $1^{st}$ term is $-3$. Find its $7^{th}$ term.

asked Feb 25, 2014 by rvidyagovindarajan_1

1 answer

What is the work done when 1 mol of water at 373 K vapourises against atmospheric pressure of 1.0 atmosphere? [Solve the question assuming ideal gas behaviour]

asked Feb 25, 2014 by mosymeow_1

1 answer

The $5^{th},8^{th}\:and\:11^{th}$ terms of a $G.P.$ are $p,q\:and\:s$ respectively. Show that $q^2=ps$

asked Feb 25, 2014 by rvidyagovindarajan_1

1 answer

The IUPAC name of the compound :$CH_2 =CH-CH(CH_3)_2$

asked Feb 25, 2014 by meena.p

1 answer

Find the $12^{th}$ term of the $G.P.$ whose $8^{th}$ term is $192$ and common ratio=$2$

asked Feb 25, 2014 by rvidyagovindarajan_1

1 answer

How many optically active stereoisomers are possible for butane$-2, 3-$diols?

asked Feb 25, 2014 by meena.p

1 answer

Find the $20^{th}$ term of the $G.P.\:\:\large\frac{5}{2},\frac{5}{4},\frac{5}{8},..........$

asked Feb 25, 2014 by rvidyagovindarajan_1

1 answer

The number of structural isomers for $C_6H_{14}$ is

asked Feb 25, 2014 by meena.p

1 answer

The IUPAC name of the compound

asked Feb 25, 2014 by meena.p

1 answer

The compound which gives the most stable carbonium ion on dehydration is

asked Feb 25, 2014 by meena.p

1 answer

Which of the following represents the given mode of hybridisation $Sp^2-Sp^2-Sp-Sp$ from left to right?

asked Feb 25, 2014 by meena.p

1 answer

Refer the below figure: Compound on hydrolysis in aqueous acetone will give,

asked Feb 25, 2014 by meena.p

1 answer

The correct statements about the compound: $H_3C(HO)HC - CH = CH -CH(OH)CH_3 (X)$ are:

asked Feb 25, 2014 by meena.p

1 answer

The correct statement(s) concerning the structures $E, F$ and $G$ is (are) (i) E,F and G are resonance structures (ii) E,F and E,G are tautomers (iii) F and G are geometrical isomers. (iv) F and G are diastereomers.

asked Feb 25, 2014 by meena.p

1 answer

Find the co-ordination number of sodium in $Na_2O$.

asked Feb 25, 2014 by sharmaaparna1

0 answers

The correct statements about the compound given below is (are) (i) The compound is optically active. (ii) The compound possesses centre of symmetry (iii) The compound possesses plane of symmetry (iv) The compound possesses axis symmetry.

asked Feb 25, 2014 by meena.p

1 answer

Tautomerism is exhibited by

asked Feb 25, 2014 by meena.p

1 answer

Which of the following compounds will show geometrical isomerism?(i) 2-butene (ii) Propene (iii) 1-phenylpropene (iv) 2-methyl-2-butene

asked Feb 25, 2014 by meena.p

2 answers

Only two isometric monochloro derivatives are possible for : (i) n-butane (ii) 2,4 -dimethylpentane (iii) benzene (iv) 2- methylpropane

asked Feb 25, 2014 by meena.p

1 answer

Dipole moment is shown by (i) 1,4 dichlorobenzene (ii) cis-1,2-dichloroethane. (iii) trans -1,2- dichleroethene (iv) trans-1,2- dichloro-2-pentene.

asked Feb 25, 2014 by meena.p

1 answer

Given $\Delta H^\circ _{ioniz}$ (HCN) = 45.2 kJ $mol^{-1}$ and $\Delta H^\circ _{ioniz} (CH_3COOH)$ = 2.1 kJ $mol^{-1}$. Which one of the following fact is true?

asked Feb 24, 2014 by mosymeow_1

1 answer

The heat evolved in combustion of benzene is given by the following equation: $C_6H_6 + \frac{15}{2} \rightarrow 3H_2O + 6CO_2$; $\Delta H= - 3264.6 kJ$ Which of the following quantities of heat will be evolved when 39 g of benzene are burnt in an open container?

asked Feb 24, 2014 by mosymeow_1

1 answer

The difference between any two consecutive interior angles of a polygon is $5^\circ$. If the smallest angle is $120^ \circ$, then find the number of sides of the polygon.

asked Feb 24, 2014 by rvidyagovindarajan_1

1 answer

A man starts repaying a loan as first installment of $Rs.100$. If he increases the installment by $Rs.5$ every month, what amount he will pay in his $30^{th}$ installment?

asked Feb 24, 2014 by rvidyagovindarajan_1

1 answer

The heat change for the following reaction at 298 K and constant pressure is +7.3 kcal. $A_2B(s) \rightarrow 2A(s) + \frac{1}{2} B_2(g)$; $\Delta H = + 7.3 kcal$ The heat change at constant volume would be

asked Feb 24, 2014 by mosymeow_1

1 answer

The enthalpy change at 298 K of the reaction $H_2O_2(l) \longrightarrow H_2O (l) + \frac{1}{2} O_2 (g)$ is -23.5 kcal $mol^{-1}$ and enthalpy of formation of $H_2O_2(l)$ is -44.8 kcal $mol^{-1}$. The enthalpy of formation of $H_2O(l)$ is

asked Feb 24, 2014 by mosymeow_1

1 answer

The work done on the system when one mole of an ideal gas at 500 K is compressed isothermally and reversibly to 1/10th of its original volume (R = 2 cal)

asked Feb 24, 2014 by mosymeow_1

1 answer

An ideal gas expands from $10^{-3} m^3$ to $10^{-2} m^3$ at 300 K, against a constant pressure of $10^5 N m^{-2}$. The work done on it is

asked Feb 24, 2014 by mosymeow_1

1 answer

For the reaction between $CO_2$ and graphite $CO_2(g) + C(s) \longrightarrow 2CO(g)$ $\Delta H = +170.0 kJ$ and $\Delta S = 170 JK^{-1}$. The reaction is spontaneous at

asked Feb 24, 2014 by mosymeow_1

1 answer

Phenol is less acidic than (i) acetic acid (ii) p-methoxyphenol (iii) p- nitrophenol (iv) ethanol

asked Feb 24, 2014 by meena.p

1 answer

An engine operating between $100^\circ C$ and $0^\circ C$ takes 453.6 Kcal of heat. How much useful work can be done by it?

asked Feb 24, 2014 by mosymeow_1

1 answer

Resonance structure of a molecule should (i) Identical arrangements of atoms. (ii) nearly the same energy content. (iii) the same number of paired electrons. (iv) identical bonding

asked Feb 24, 2014 by meena.p

1 answer

Between $1\:\:and\:\:31$ $m$ numbers are inserted so that the resulting sequence is an $A.P.$ and the ratio of $7^{th}\:\;and\:\:(m-1)^{th}$ numbers is $5:9$. find the value of $m$.

asked Feb 24, 2014 by rvidyagovindarajan_1

1 answer

The major product of the following reaction is :

asked Feb 24, 2014 by meena.p

1 answer

What percent $T_1$ is of $T_2$ for a heat engine whose efficiency is 10%?

asked Feb 24, 2014 by mosymeow_1

1 answer

If $\large\frac{a^n+b^n}{a^{n-1}+b^{n-1}}$ is the $A.M.$ between $a$ and $b$, then find the value of $n$

asked Feb 24, 2014 by rvidyagovindarajan_1

1 answer

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

1 answer

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

1 answer

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

1 answer

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

asked Feb 24, 2014 by mosymeow_1

2 answers

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

1 answer

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

asked Feb 24, 2014 by mosymeow_1

2 answers

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

asked Feb 24, 2014 by mosymeow_1

2 answers

For the gaseous reaction involving the complete combustion of isobutane

asked Feb 24, 2014 by mosymeow_1

1 answer

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

asked Feb 24, 2014 by meena.p

1 answer

The correct stability order for the following species is

asked Feb 24, 2014 by meena.p

1 answer

In the following compounds?

asked Feb 24, 2014 by meena.p

1 answer

Give the numbers of N and M?

asked Feb 24, 2014 by meena.p

1 answer

Ask Questions, Get Answers