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Recent questions tagged q181
Questions
Pure $O_2$ diffuses through an aperture in 224 seconds whereas mixture of $O_2$ and another gas containing $80\%\;O_2$ diffuses from the same in 234 sec. What is mol. wt. of gas?
jeemain
chemistry
states-of-matter
liquifaction-of-gases
unit5
class11
difficult
q181
asked
Apr 5, 2014
by
sharmaaparna1
1
answer
The following is the percentage composition of a compound. $Na = 16.08 \%, C = 4.19 \%, O = 16.78 \%$ and $H_2O = 62.95 \%$ . Its molecular formula is
jeemain
chemistry
class11
organic-chemistry
q181
medium
basic-organic-chemistry
ch12
asked
Mar 5, 2014
by
meena.p
1
answer
Rutherford proposed the atomic model after his most striking experiment on $\alpha$– scattering leading to discovery of nucleus. Bohr later on modified the atomic model on the basis of Planck’s quantum theory of light and proposed the concept of stationary circular orbits of quantised energy $\large\frac{nh}{2\pi}$. The collection of fine lines in line spectrum led Sommerfeld to gave the idea of elliptical orbits. He successfully explained the existence of subshells and their number in a shell. The angular momentum of subshells was propped as $\sqrt{l(l+1}\times\large\frac{h}{2\pi}$. The emission of a spectral line in atomic spectra was supposed to be due to the jump of electron from one energy level to other. Calculate the angular momentum of electron in 2p orbital is
jeemain
chemistry
physical-chemistry
class11
unit2
atomic-structure
quantum-mechanical-model
medium
q181
asked
Feb 8, 2014
by
sharmaaparna1
1
answer
If $a_{n}=\displaystyle\sum_{k=1}^{n}\;\large\frac{1}{k(n+1-k)}$, then for $n\;\geq\;2$
jeemain
math
class11
ch9
sequences-and-series
difficult
sum-of-n-terms-of-special-series
q181
asked
Jan 23, 2014
by
yamini.v
1
answer
If $\alpha,\beta$ are roots of $ax^2+bx+c=0$ then $\lim\limits_{x\to \alpha}\large\frac{1-\cos(ax^2+bx+c)}{(x-\alpha)^2}$ is
jeemain
math
ch13
limits and differentiability
introduction to limits
difficult
q181
asked
Jan 6, 2014
by
sreemathi.v
1
answer
Integrate : $\int \sqrt{\large\frac{x}{1+x}}$$dx$
jeemain
math
class12
ch7
integral-calculus
integration-by-subsitution
difficult
q181
asked
Dec 30, 2013
by
meena.p
1
answer
Bacterial leaf blight of rice is caused by a species of :
aipmt
modelpaper
biology
2008
q181
asked
Dec 21, 2013
by
thanvigandhi_1
0
answers
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