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Recent questions tagged q151

$O_2$ is collected over water at $20^{\large\circ}C$. The pressure inside shown by the gas is 740 mm of Hg. What is the pressure due to $O_2$ alone if V.P of $H_2O$ is 18 mm at $20^{\large\circ}C$

asked Mar 26, 2014 by sharmaaparna1

1 answer

The kind of delocalization involving sigma bond orbitals is called,

asked Mar 4, 2014 by meena.p

1 answer

Find the locus of a middle point of a system of parallel chords of a circle $x^2+y^2=a^2$?

asked Feb 11, 2014 by sreemathi.v

1 answer

The photo electric emission requires a threshold frequency $V_o$. For a certain metal $\lambda_1$ = 2200 $\overset{\circ}{A}$ and $\lambda_2$ = 1900 $\overset{\circ}{A}$ produce electrons with a maximum kinetic energy $KE_1$ and $KE_2$. If $KE_2 = 2KE_1$. Calculate $V_o$ and corresponding $\lambda_o$.

asked Jan 30, 2014 by sharmaaparna1

1 answer

Calculate the largest wavelength which can remove the electron from 1 Bohr's orbit. Given $E_1$ = 13.6 eV

asked Jan 30, 2014 by sharmaaparna1

1 answer

If $\;a_{1},a_{2},a_{3}\;(a_{1}\;\geq\;0)$ are in GP with common ratio r . the value of r for which inequality $\;a_{3}\;\geq\;4a_{2}-3a_{1}$ holds is given by ,

asked Jan 22, 2014 by yamini.v

1 answer

$f$ is defined in [-5,5] as $f(x)=\left\{\begin{array}{1 1}x&if\;x\;is\;rational\\-x&if\;x\;is\;irrational\end{array}\right.$. Then

asked Jan 3, 2014 by sreemathi.v

1 answer

Integrate : $ \int \sqrt {x} (6x^4 +2(x) ^{3/2} +\large\frac{8}{\sqrt x } ) $$dx$

asked Dec 23, 2013 by meena.p

1 answer

Given below are four methods (A - D ) and their modes of action ( a - d) in achieving contraception. Select their correct matching from the four options that follow :

asked Dec 21, 2013 by thanvigandhi_1

0 answers

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

0 answers

0.16 gms of an organic compound containing sulphur produces 0.233 gms of $BaSO_4$. Percentage of sulphur in the compound is :

asked Nov 9, 2013 by thanvigandhi_1

0 answers

The first spectral line in the Pfund series of Hydrogen spectrum is given by $(R_H$ = Rydberg constant )

asked Oct 24, 2013 by thanvigandhi_1

1 answer

What are $\underline X $ and $\underline Y$ respectively in the following reaction ?

asked Oct 21, 2013 by meena.p

1 answer

For the following cell reaction $Ag | Ag^{+} | AgCl | Cl^{\ominus } | Cl_2,Pt\; \Delta G^{\circ}_f (AgCl)=-109\; kJ/mol;$$\Delta G^{\circ}_f (Cl^{\ominus})=-129 \; kJ/mol;\Delta G^{\circ}_f (Ag^+)=78\; kJ/mol ; E^{\circ}$ of the cell is :

asked Oct 15, 2013 by meena.p

1 answer

The number of $ \sigma\: and \: \pi$ bonds present in acetylene are respectively

asked Oct 14, 2013 by thanvigandhi_1

1 answer

In which of the following, ortho/para substitution by an electrophile is very facile?

asked Oct 2, 2013 by meena.p

1 answer

Identify X in the following :

asked Sep 25, 2013 by meena.p

1 answer

Assertion (A): $-NH_2$ group of aniline is ortho, para directing in electrophilic substitutions. Reason (R) : $-NH_2$ group stabilizes the arenium ion formed by the ortho, para attack of the electrophile.

asked Sep 19, 2013 by meena.p

1 answer

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