Recent questions tagged class11

The metal that can't displace hydrogen from dil HCl is

asked Jan 22, 2014 by sreemathi.v

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Which isotope of hydrogen is/are radioactive in nature?

asked Jan 22, 2014 by sreemathi.v

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$\alpha$ & $\beta\;$are +ve roots of $\;x^2-2ax+ab=0\;$ then for $\;n \in N\;$$(0 \lt b \lt a)\;S_{n}=1+2(\large\frac{b}{a})$$+3(\large\frac{b}{a})^{\normalsize 2}$$+\;...+\;n$$(\large\frac{b}{a})^{n-1}\;$ can not exceed .

asked Jan 22, 2014 by yamini.v

1 answer

The bond length is more in

asked Jan 22, 2014 by sreemathi.v

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If a,b,c are real and $\;4a^2+9b^2+16c^2-6ab-12bc-8ac=0\;$ the a,b,c are in

asked Jan 22, 2014 by yamini.v

1 answer

The electronic configuration is $1s^1$ for

asked Jan 22, 2014 by sreemathi.v

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$\large\frac{n}{p}$ ratio of $1^{\Large H^1}$ is

asked Jan 22, 2014 by sreemathi.v

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The radioactive isotope of hydrogen is

asked Jan 22, 2014 by sreemathi.v

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$ If\;a_{1}=\frac{1}{2}\;,a_{k+1}=a_{k}^{2}+a_{k}\;\forall\;k\;\geq\;1\;and\;x_{n}=\large\frac{1}{a_{1}+1}+\large\frac{1}{a_{2}+1}+...\;\large\frac{1}{a_{n}+1}\;the \;value\;of\;[x_{50}]\;is\;([.]\;represents\;greatest\;integer\;function)$)

asked Jan 22, 2014 by yamini.v

1 answer

The number of isotopes of hydrogen are

asked Jan 22, 2014 by sreemathi.v

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Ratio of the Bohr radius of protium ,deuterium and tritium atom is

asked Jan 22, 2014 by sreemathi.v

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If $\;a_{1}=1\;,a_{n+1}=2a_{n}+1$ then , $\;a_{n+1}$ equals

asked Jan 22, 2014 by yamini.v

1 answer

Sum of n terms of series $\;S=1^2+2(2)^2+3^2+2(4)^2+5^2+\;....\;$ when n is even is :

asked Jan 22, 2014 by yamini.v

1 answer

Neutron is not present in the nucleus of

asked Jan 22, 2014 by sreemathi.v

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Tritium emits

asked Jan 22, 2014 by sreemathi.v

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Electronic configuration of Deuterium is

asked Jan 22, 2014 by sreemathi.v

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Which of the following gas is lightest

asked Jan 22, 2014 by sreemathi.v

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The name hydrogen was proposed by

asked Jan 22, 2014 by sreemathi.v

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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

Hydrogen finds a place in VII group of periodic table because

asked Jan 22, 2014 by sreemathi.v

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If $\;px^2+\large\frac{q}{x}\;\geq\;r\;$ for every +ve x $\;(p>0 , q>0)\;,\;$ then $\;27pq^2\;$ can not be less than

asked Jan 22, 2014 by yamini.v

1 answer

The lightest element in the periodic table is

asked Jan 22, 2014 by sreemathi.v

1 answer

$\;A_{1},A_{2}\;,....\;A_{n}\;$ are fixed +ve real number such that $\;A_{1}\;.A_{2}\;..\;A_{n}=k$ , then $\;A_{1}+2A_{2}+\;...\;nA_{n}$ can not be than :

asked Jan 22, 2014 by yamini.v

1 answer

PAN is called as

asked Jan 22, 2014 by sreemathi.v

1 answer

$Cl+O_3\rightarrow x+O_2,ClO+O\rightarrow y+O_2$.Net reaction :$O_3+O\quad\underrightarrow {Cl}\quad z$.The $z$ is

asked Jan 22, 2014 by sreemathi.v

1 answer

If a,b,c,d are positive real number , then least value of $\;(a+b+c+d)\;(\frac{1}{a}+\frac{1}{b}+\frac{1}{c}+\frac{1}{d})\;$ is :

asked Jan 22, 2014 by yamini.v

1 answer

$Cl+O_3\rightarrow x+O_2,ClO+O\rightarrow y+O_2$.Net reaction :$O_3+O\quad\underrightarrow {Cl}\quad z$.The $y$ is

asked Jan 22, 2014 by sreemathi.v

1 answer

$Cl+O_3\rightarrow x+O_2, \\ ClO+O\rightarrow y+O_2 \\ Net\; reaction\; :\; O_3+O\overset{Cl}{\longrightarrow} z. \; \\ Then \;x\; is$

asked Jan 22, 2014 by sreemathi.v

1 answer

Ratio of sum of n terms of two AP's is $\;(5n+3)\;:\;(3n+4)\;,$ then the ratio of $\;15^{th}\;$ term will be :

asked Jan 22, 2014 by yamini.v

1 answer

$CF_2Cl_2+hv\rightarrow CF_2Cl+A,CFCl_3+hv\rightarrow CFCl_2+B$.Both $A$ and $B$ are same

asked Jan 22, 2014 by sreemathi.v

1 answer

Sum of first $n$ terms of an $AP$ is $kn^2$, sum of their squares will be

asked Jan 22, 2014 by yamini.v

1 answer

$CF_2Cl_2+hv\rightarrow CF_2Cl+A,CFCl_3+hv\rightarrow CFCl_2+B$. Which of the following is B?

asked Jan 22, 2014 by sreemathi.v

1 answer

$CF_2Cl_2+hv\rightarrow CF_2Cl+A,CFCl_3+hv\rightarrow CFCl_2+B$.what is A?

asked Jan 22, 2014 by sreemathi.v

1 answer

$x(CH_2O)\rightarrow CO_2+CH_4$.The $x$ is

asked Jan 22, 2014 by sreemathi.v

1 answer

$x(CH_2O)\rightarrow CO_2+y$.The $y$ can be used as fuel

asked Jan 22, 2014 by sreemathi.v

1 answer

If $\;p=1+\frac{1}{2}+\frac{1}{3}+\;....\;+\frac{1}{n}\;$ then $\;S=\frac{1^2}{1^3}+\frac{1^2+2^2}{1^3+2^3}+\large\frac{1^2+2^2+3^2}{1^3+2^3+3^3}+\;....\;$ upto n terms equal to

asked Jan 22, 2014 by yamini.v

0 answers

If $p$ = $1$ + $\large\frac{1}{2}$ + $\large\frac{1}{3}$+....+$\large\frac{1}{n}$, then $S$ = $\large\frac{1^2}{1^3}$ + $\frac{1^2+2^2}{1^3+2^3}$ + $\large\frac{1^2+2^2+3^2}{1^3+2^3+3^3}$+.... upto $n$ terms equal to

asked Jan 22, 2014 by yamini.v

1 answer

$NO+O_3\rightarrow NO_2+O_2,O_3+hv\rightarrow x+y,NO_2+O\rightarrow z+x$.Net reaction :$A(O_3)+hv\rightarrow BO_2$.$B-A$ is

asked Jan 22, 2014 by sreemathi.v

1 answer

$NO+O_3\rightarrow NO_2+O_2,\;O_3+hv\rightarrow x+y,\;NO_2+O\rightarrow z+x$. Net reaction : $A(O_3)+hv\rightarrow BO_2$. The $z+x$ are

asked Jan 22, 2014 by sreemathi.v

1 answer

Sum of n terms of series $(n^2-1^2)$ + $2\;.(n^2-2^2)$ + $3\;.(n^2-3^2)$+.....is

asked Jan 22, 2014 by yamini.v

1 answer

$NO+O_3\rightarrow O_2,O_3+hv\rightarrow x+y,NO_2+O\rightarrow z + x$.Net reaction :$A(O_3)+hv\rightarrow BO_2$.The $x$ and $y$ are

asked Jan 22, 2014 by sreemathi.v

1 answer

Sum of n terms of series $\;1.3.5+3.5.7+5.7.9+$.......is

asked Jan 22, 2014 by yamini.v

1 answer

The name of the $H_2CO_3$ acid is and it is ?

asked Jan 22, 2014 by sreemathi.v

1 answer

Three positive numbers $p, q, r$ are in HP, $(r > p)$, then $log (p+r) + log (p-2q+r)$ is equal to

asked Jan 22, 2014 by yamini.v

1 answer

$CO_2+H_2O\rightarrow x$.The $x$ is

asked Jan 22, 2014 by sreemathi.v

1 answer

$xNO_2+yH_2O+O_2\rightarrow 4z$.The sum of $x+y=$

asked Jan 22, 2014 by sreemathi.v

1 answer

$xNO_2+yH_2O+O_2\rightarrow 4z$.The $y$ is

asked Jan 22, 2014 by sreemathi.v

1 answer

$xNO_2+yH_2O+O_2\rightarrow 4z$.The $z$ in the equation is

asked Jan 22, 2014 by sreemathi.v

1 answer

$2SO_2+O_2+x\rightarrow 2H_2SO_4$.The $x$ is

asked Jan 22, 2014 by sreemathi.v

1 answer

Given the following statement: All seats are hot. All belts are hot. Now, consider the claims: C1: Some seats are belts. C2: All hot are either seats or belts . Now, mark according to the rules - \[\] i) Mark A if C1 is true, ii) Mark B if C2 is true,iii) Mark C if neither C1 nor C2 is true and iv) Mark D if both C1 and C2 are true.

asked Jan 21, 2014 by thanvigandhi_1

1 answer

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