Recent questions tagged class11

The average speed of an ideal gas molecule at $27^{\large\circ}C$ is 0.3 m/s. Calculate the average speed at $927^{\large\circ}C$

asked Feb 21, 2014 by sharmaaparna1

1 answer

A vertical hollow cylinder of height 1.52m is fitted with a movable piston of negligible mass and thickness. The lower half of the cylinder contains an ideal gas and the upper half is filled with mercury. The cylinder is initially at 300K. When the temperature is raised half of the mercury comes out of the cylinder . Find the temperature assuming the thermal expansion of mercury to be negligible.

asked Feb 21, 2014 by sharmaaparna1

1 answer

Statement - 1: Phenol is more reactive than benzene towards elecrophilic substitution reaction . Statement - 2: In the case of phenol, the intermediate carbocation is more resonance stabilized.

asked Feb 21, 2014 by meena.p

1 answer

Statement 1: Molecules that are not super imposable on their mirror images are chiral. Statement -2 : All chiral molecules have chiral centres.

asked Feb 21, 2014 by meena.p

1 answer

Statement - 1: Aryl halides undergo nucleophilic substitution with ease. Statement - 2: The carbon - halogen bond in aryl halides has partial double bond character.

asked Feb 21, 2014 by meena.p

1 answer

Most stable carbonium ion is

asked Feb 21, 2014 by meena.p

3 answers

Among the following compounds, the strongest acid is

asked Feb 21, 2014 by meena.p

1 answer

Which of the following acids has the smallest dissociation constant

asked Feb 21, 2014 by meena.p

1 answer

The number of stereoisomers obtained by bromiantion of trans-2-butene is

asked Feb 21, 2014 by meena.p

1 answer

Hyper conjugation involves overlap of the following orbitals

asked Feb 21, 2014 by meena.p

1 answer

Isomers which are mirror images are known as __

asked Feb 21, 2014 by meena.p

1 answer

An aromatic molecule will

asked Feb 21, 2014 by meena.p

1 answer

Identify the correct order of boiling points of the following compounds : $CH_3 CH_2 CH_2OH,CH_3CH_{\large 2_2}CH_2CHO , CH_3CH_{\large 2_3}CH_2COOH$

asked Feb 21, 2014 by meena.p

2 answers

A vessel of volume 5 litre contains 1.4g of nitrogen at temperature 1800K. Find the pressure of the gas if $30\%$ of its molecules are dissociated into atoms at this temperature.

asked Feb 20, 2014 by sharmaaparna1

1 answer

An evacuated glass vessel weighs 50.0g when empty 148.0 g when filled with a liquid of density $0.98gmL^{-1}$ and 50.5g when filled with an ideal gas at 760mm Hg of 300K.Determine the molecular weight of the gas.

asked Feb 20, 2014 by sharmaaparna1

1 answer

The Volume of the average adult lung when expanded is about $6L$ at $98.4^{\large\circ}F$. If the pressure of oxygen in inhaled air is $168mm$ of $Hg$ , calculate the mass of $O_2$ required to occupy the lung at $98.4^{\large\circ}F$.

asked Feb 20, 2014 by sharmaaparna1

1 answer

Molecule in which the distance between the two adjacent carbon atoms is large is

asked Feb 20, 2014 by meena.p

1 answer

The IUPAC name of the compounds having the formula

asked Feb 20, 2014 by meena.p

1 answer

Which of the following compound will exhibit geometrical isomerism.

asked Feb 20, 2014 by meena.p

1 answer

Among the following, the compound that can be most readily sulphonated is

asked Feb 20, 2014 by meena.p

1 answer

Which of the following has the highest nucleophilicity

asked Feb 20, 2014 by meena.p

1 answer

If the sum of certain number of terms of the A.P., $25,22,19................$ is $116$, then find the last term.

asked Feb 20, 2014 by rvidyagovindarajan_1

1 answer

Which of the following has the highest nucleophilicity

asked Feb 20, 2014 by meena.p

1 answer

Which of the following has the most acidic hydrogen

asked Feb 20, 2014 by meena.p

1 answer

In an $A.P.$ if $p^{th}$ term is $\large\frac{1}{q}$ and $q^{th}$ term is $\large\frac{1}{p}$, then prove that the sum of first $pq$ terms is $\large\frac{1}{2}$$(pq+1)$ where $p\neq q$

asked Feb 20, 2014 by rvidyagovindarajan_1

1 answer

In the given conformation, if $C_2$ is rotated $C_2 -C_3$ bond anticlockwise by an angle of $120^{\circ}$ then the conformation obtained is

asked Feb 20, 2014 by meena.p

1 answer

How many terms of the A.P. $-6,-\large\frac{11}{2}$$, -5........$ are needed to give the sum $-25$

asked Feb 20, 2014 by rvidyagovindarajan_1

1 answer

The $C-H$ bond distance is the longest in

asked Feb 20, 2014 by meena.p

1 answer

Isomers which can be inter converted through rotation around a single bond are :

asked Feb 20, 2014 by meena.p

1 answer

In $CH_3CH_2OH$ the bond that undergoes heterolytic cleavage most readily is

asked Feb 20, 2014 by meena.p

1 answer

An isomer of ethanol is

asked Feb 20, 2014 by meena.p

1 answer

The bond order of individual carbon-carbon bonds is benzene is :

asked Feb 20, 2014 by meena.p

1 answer

Two glass bulbs with equal volume are connected by a narrow tube and filled with a gas at $0^{\large\circ}C$ and pressure of $76\;cm\; Hg$ . One of the bulb is then placed in a water bath maintained at $62^{\large\circ}C$. What is the new value of the pressure inside the bulbs? The volume of the connecting tube is negligible.

asked Feb 20, 2014 by sharmaaparna1

1 answer

1.47 litre of a gas is collected over water at $30^{\large\circ}C$ and 744mm of Hg . If the gas weight 1.98g and vapour pressure of water at $30^{\large\circ}C$ is 32mm , What is the molecular weight of gas?

asked Feb 20, 2014 by sharmaaparna1

1 answer

A monoatomic ideal gas undergoes a process in which the ratio of P to V at any instant is constant and equal to unity. The molar heat capacity of gas is:

asked Feb 20, 2014 by sharmaaparna1

1 answer

In Victor Mayers experiment 0.23g of a volatile solute displaced air which measures 112mL at NTP .Calculate the vapour density and molecular weight of substance

asked Feb 20, 2014 by sharmaaparna1

1 answer

3.7 g of a gas at $25^{\large\circ}C$ occupy the same volume as 0.184g of $H_2$ at $17^{\large\circ}C$ at same pressure. What is moleculer weight of gas?

asked Feb 20, 2014 by sharmaaparna1

1 answer

In an $A.P.$ the first term is $2$ and the sum of first $5$ terms is one-fourth of the next five terms. Find its $20^{th}$ term.

asked Feb 19, 2014 by rvidyagovindarajan_1

1 answer

Find the sum of all the natural numbers lying between $100\:\: and\:\: 1000$ which are multiples of $5$

asked Feb 19, 2014 by rvidyagovindarajan_1

1 answer

Find the sum of odd integers from $1 $ to $2001$

asked Feb 18, 2014 by rvidyagovindarajan_1

1 answer

The Fibanocci sequence is defined by $1=a_1=a_2\:\:and\:\:a_n=a_{n-1}+a_{n-2}\:\:for\:n>2$ Find $\large\frac{a_{n+1}}{a_n}$, for $n=1,2,3,4,5$

asked Feb 18, 2014 by rvidyagovindarajan_1

1 answer

Find the first $5$ terms of the series given by $a_1=a_2=2,\:a_n=a_{n-1}-1\:\:for\:\:n>2$

asked Feb 18, 2014 by rvidyagovindarajan_1

1 answer

Write the first five terms of the sequence given by $a_1=-1,\:a_n=\large\frac{a_{n-1}}{n}$$\:for\:n\geq 2$

asked Feb 18, 2014 by rvidyagovindarajan_1

1 answer

Find the first five terms of the sequence given by $a_1=3,\:a_n=3a_{n-1}+2\:\:\forall \:n\in N\:and\:n>1$

asked Feb 18, 2014 by rvidyagovindarajan_1

1 answer

Find $a_{20}$ if $a_n=\large\frac{n(n-2)}{n+3}$

asked Feb 18, 2014 by rvidyagovindarajan_1

1 answer

Find $a_9$ if $a_n=(-1)^{n-1}.n^3$

asked Feb 18, 2014 by rvidyagovindarajan_1

1 answer

Find $a_7$ if $a_n=\large\frac{n^2}{2^{n}}$

asked Feb 18, 2014 by rvidyagovindarajan_1

1 answer

Find $a_{17},\:a_{24}$ if $a_n=4n-3$

asked Feb 17, 2014 by rvidyagovindarajan_1

1 answer

Find the first 5 terms of the sequence whose general term is $t_n=n.\large\frac{n^2+5}{4}$

asked Feb 17, 2014 by rvidyagovindarajan_1

1 answer

Find the first $5$ terms of the sequence whose general term is $t_n=(-1)^{n-1}.\:5^{n+1}$

asked Feb 17, 2014 by rvidyagovindarajan_1

1 answer

Ask Questions, Get Answers