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Recent questions tagged q158

A 20g chunk of dry ice is placed in an empty 0.75 litre wine bottle tightly closed . What would be the final pressure in the bottle after all $CO_2$ has been evaporated and temperature reaches to $25^{\large\circ}C$

asked Mar 29, 2014 by sharmaaparna1

1 answer

Two elements $X$(atomic weight =$75$) and $Y$(atomic weight =16) combine to give a compound having $75.8 \%\; X$. The formula of the compound is

asked Mar 4, 2014 by meena.p

1 answer

The dissociation energy of $H_2$ is 430.53 KJ$mol^{-1}$. If $H_2$ is exposed to radiation energy of wavelength 253.7nm, what % of radiant energy will be converted into kinetic energy ?

asked Feb 1, 2014 by sharmaaparna1

1 answer

If x , y , z are in GP then , $\;\large\frac{1}{x^2-y^2}+\frac{1}{y^2}\;$ equals

asked Jan 22, 2014 by yamini.v

1 answer

If $f:R\to R$ is a function defined by $f(x)=[x]\cos\big(\large\frac{2x-1}{2}\big)$$\pi$ where [x] denotes the greatest integer function then f is

asked Jan 3, 2014 by sreemathi.v

1 answer

Integrate : $\int \cos^3 x \sin ^2 x dx$

asked Dec 24, 2013 by meena.p

1 answer

In humans, at the end of the first meiotic division, the male germ cells differentiate into the :

asked Dec 21, 2013 by thanvigandhi_1

1 answer

1,3-Butadiene and styrene on polymerisation give :

asked Nov 20, 2013 by thanvigandhi_1

1 answer

19 gms of a mixture containing $NaHCO_3\: and \: Na_2CO_3$ on complete heating liberated 1.12 lit of $CO_2$ at STP. The weight of the remaining solid was 15.9 gms. What is the weight ( in g ) of $Na_2CO_3$ in the mixture before heating ?

asked Nov 9, 2013 by thanvigandhi_1

0 answers

Which one of the following solutions has a lowest freezing point?

asked Oct 24, 2013 by thanvigandhi_1

1 answer

Match the following:

asked Oct 21, 2013 by meena.p

0 answers

$20\; ml$ of $0.1\;M$ acetic acid is mixed with $50\;ml$ of Potassium acetate. $K_a$ of Acetic acid = $1.8 \times 10^{-5}$ at $27^{\circ}C$. The concentration of Potassium acetate if pH of the mixture is $4.8$:

asked Oct 16, 2013 by meena.p

1 answer

Molar conductances of $BaCl_2, H_2SO_4\: and HCl$ at infinite dilution are $X_1,X_2\: and \: X_3$ respectively. Molar conductance of $ BaSO_4$ at infinite dilusion is

asked Oct 14, 2013 by thanvigandhi_1

1 answer

If the number average molecular weight and weight average molecular weight of a polymer are $40,000$ and $60,000$ respectively, the polydispersity index of the polymer will be :

asked Oct 2, 2013 by meena.p

1 answer

With the reference to the diagram given, the van der walls redius is equal to :

asked Sep 26, 2013 by meena.p

1 answer

Example of a biodegradable polymer pair is :

asked Sep 19, 2013 by meena.p

1 answer

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