Recent questions tagged class11

Given $1^2+2^2+3^2+....+2003^2$ = $(2003)(4007)(334)$ and $(1)(2003)+(2)(2002)+(3)(2001)+....+(2003)(1)$ = $(2003)(334)(x)$ then value of $x$ is

asked Jan 23, 2014 by yamini.v

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The volume strength of $3N-H_2O_2$ solution is

asked Jan 23, 2014 by sreemathi.v

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In $10^5$g of a sample of water contained 16.2g of $Ca(HCO_3)_2$ then the hardness is

asked Jan 23, 2014 by sreemathi.v

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If 1000g of a water sample contains 10g of $CaCO_3$ then the hardness of that water sample is

asked Jan 23, 2014 by sreemathi.v

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The weight of one mole of heavy water is

asked Jan 23, 2014 by sreemathi.v

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If $a_{n}=\displaystyle\sum_{k=1}^{n}\;\large\frac{1}{k(n+1-k)}$, then for $n\;\geq\;2$

asked Jan 23, 2014 by yamini.v

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An oil drop has $8.01\times10^{-19}$ C charge. Calculate the number of electrons in this drop.

asked Jan 23, 2014 by sharmaaparna1

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A sample of hard water contains 68ppm of $CaSO_4$,then the hardness of the same sample of water is

asked Jan 23, 2014 by sreemathi.v

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If $f_{1}=f_{2}=1$ and thereafter $f_{n+2}=f_{n+1}+f_{n}$ for all $n \in N$. Find $\displaystyle\sum_{n=2}^{\infty}\;\large\frac{1}{f_{n+1}\;.f_{n-1}}$

asked Jan 23, 2014 by yamini.v

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The percentage of deuterium in heavy water

asked Jan 23, 2014 by sreemathi.v

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$S_{1}, S_{2},.....S_{n}$ are sums of infinite geometric series with first term $1,2,3,...n$ and common ratio $\large\frac{1}{2}$, $\large\frac{1}{3}$,...$\large\frac{1}{n+1}$ respectively. Find $\displaystyle\sum_{r=1}^{n}\;S_{r}$.

asked Jan 23, 2014 by yamini.v

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In $H_2O_2$ molecule the $O-O$ bond length is

asked Jan 23, 2014 by sreemathi.v

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Hyperol is a addition product of $H_2O_2$ with

asked Jan 23, 2014 by sreemathi.v

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Find sum upto n terms: $\large\frac{3}{1^2.2^2}+\large\frac{5}{2^2.3^2}+\large\frac{7}{3^2.4^2}$+....

asked Jan 23, 2014 by yamini.v

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The wavelength of $m^{th}$ line Balmer series for an orbital is $4103 A^{\large\circ}$. What is the value of $m$?

asked Jan 23, 2014 by sharmaaparna1

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Find the sum of the numbers in the $n^{th}$ set: $(1)$, $(2,3)$, $(4,5,6)$, $(7,8,9,10)$.....

asked Jan 23, 2014 by yamini.v

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Which of the following is reduced by $H_2O_2$ in acid medium

asked Jan 23, 2014 by sreemathi.v

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Find sum of first n terms of series : $\;1+\large\frac{1}{1+2}+\large\frac{1}{1+2+3}+\;....$

asked Jan 23, 2014 by yamini.v

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Which of the following is linear molecule

asked Jan 23, 2014 by sreemathi.v

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An aqueous solution of $H_2O_2$ is

asked Jan 23, 2014 by sreemathi.v

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Evaluate sum to n terms $\;1.1+2.01+3.001+\;.....$

asked Jan 23, 2014 by yamini.v

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A reaction of $H_2O_2$ with urea is example of

asked Jan 23, 2014 by sreemathi.v

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At a pressure 68mm.$H_2O_2$ boils at temperture

asked Jan 23, 2014 by sreemathi.v

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For an AP with first term $a$ and common difference $d$, if $\large\frac{S_{nx}}{S_{x}}\:(S_{r}$ denotes sum upto $r$ term$)$ is independent of $x$ then,

asked Jan 23, 2014 by yamini.v

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Calculate the number of waves made by a Bohr's electron in one complete revolution in its 3rd orbit of H-atom

asked Jan 23, 2014 by sharmaaparna1

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$H_2O_2+H_2O\rightarrow H_3O^-+HO_2^-$ the reaction indicates

asked Jan 23, 2014 by sreemathi.v

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If $log\:_{5.2^{x}+1}^{2}$, $log\:_{2^{x-1}+1}^{4}$ and 1 are in HP, then

asked Jan 23, 2014 by yamini.v

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Which of the following is oxidized by $H_2O_2$ in the alkaline medium

asked Jan 23, 2014 by sreemathi.v

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In a thermodynamic process, neon obeys the law $TP^{\large\frac{2}{5}}$ = constant. If the temperature of 2 moles of gas is raised from T to 5T, then the heat given to gas (consider ideal behaviour) is what?

asked Jan 23, 2014 by balaji.thirumalai

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$H_2$ gas is liberated when $H_2O_2$ reacts with

asked Jan 23, 2014 by sreemathi.v

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In a thermodynamic process, an ideal monoatomic gas follows the law $TP^{\large\frac{3}{5}} = $ constant. If temperature of 2 moles of gas is raised from T to 4 T, then what is the heat given to the gas?

asked Jan 23, 2014 by balaji.thirumalai

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If a gas is made to expand in such a way that pressure increases and its final and initial volumes are equal then which of the following statements must be true?

asked Jan 23, 2014 by balaji.thirumalai

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$O_2^{2-}$ is the symbol of _________ ion.

asked Jan 23, 2014 by sreemathi.v

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If a gas is made to expand in such a way that its final and initial pressure are equal then which of the following statements cannot be true?

asked Jan 23, 2014 by balaji.thirumalai

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The O-O bond is not present in

asked Jan 23, 2014 by sreemathi.v

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$H_2O_2$ forms prismatic crystals at

asked Jan 23, 2014 by sreemathi.v

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If the sum of first n terms of an AP is half the sum of next n terms, then $\large\frac{S_{4n}}{S_{n}}$ equals

asked Jan 23, 2014 by yamini.v

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$H_2O_2$ reduces $K_3[Fe(CN)_6]$ in

asked Jan 23, 2014 by sreemathi.v

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A gas is made to expand in such a way that its final and initial temperatures are equal and also the process followed by the gas traces a straight line of the PV diagram. Then, which of the following statements is true?

asked Jan 23, 2014 by balaji.thirumalai

1 answer

$H_2O_2\rightarrow 2H^++O_2+2e^-$.$E^{\large\circ}=-0.68v$.The given equation represents the following nature of $H_2O_2$

asked Jan 23, 2014 by sreemathi.v

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Sum of the series $\;S=\large\frac{4}{7}-\large\frac{5}{7^2}+\large\frac{4}{7^3}-\large\frac{5}{7^4}+.....\;\infty\;$ is :

asked Jan 23, 2014 by yamini.v

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Hard water is passed through an ionic exchange resin containing -$SO_3H$ group.The out coming water is free from the following ions.

asked Jan 23, 2014 by sreemathi.v

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Exhausted permit does not contain __________ ion.

asked Jan 23, 2014 by sreemathi.v

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Which of the following substance is not present in clear hard water

asked Jan 23, 2014 by sreemathi.v

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Pure water can be obtained from sea water by

asked Jan 23, 2014 by sreemathi.v

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Permanent hardness of water cannot be completely removed by

asked Jan 23, 2014 by sreemathi.v

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Given $a_{n}=\displaystyle\sum_{k=1}^{n}\;\sqrt{1+\large\frac{1}{k^2}+\large\frac{1}{(k+1)^2}}\;$ the value of $\;a_{5}\;$ is

asked Jan 23, 2014 by yamini.v

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$a,x,y,z,b$ are in AP such that $x+y+z=15$ and $a$, $\alpha$, $\beta$, $y$, $b$ are in HP such that $\large\frac{1}{\alpha}+\large\frac{1}{\beta}+\large\frac{1}{\gamma}=\large\frac{5}{3}$. Find $a$, $(a > b)$.

asked Jan 23, 2014 by yamini.v

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The sum of three terms of a strictly increasing GP is $\alpha S$ and sum of their squares is $S^{2}$. $\alpha^{2}$ lies in

asked Jan 23, 2014 by yamini.v

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Given for every $n \in N \;(1^2-a_{1})+(1^2-a_{2})+.......+(n^2-a_{n})=\large\frac{1}{3}n(n^2-1)\;the\;a_{n}$ equals

asked Jan 23, 2014 by yamini.v

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