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Recent questions tagged q23
Questions
An organic compound (A) on reduction gives compound (B).(B) On treatement with $CHCl_3$ alcoholic potash gives (C) (C) on catalytic reduction gives N-methyl aniline.The compound A is
jeemain
aipmt
chemistry
nitrogen
organic-chemistry
cbse
class12
unit13
q23
medium
asked
Mar 22, 2014
by
thanvigandhi_1
1
answer
In the manufacture of iron, the principal reaction in the zone of heat absorption of the blast furnace is
jeemain
cbse
chemistry
class12
unit6
general-principals-and-processes-of-isolation-of-metals
q23
medium
asked
Mar 17, 2014
by
meena.p
1
answer
The energy change of the reaction \[\] $C_2H_6(g) \rightarrow 2C(g) + 6H(g)$ \[\] is $x\: kJ$. The bond energy of $C-H$ bond is
jeemain
physics
thermodynamics
cbse
class11
class12
q23
easy
asked
Mar 15, 2014
by
thanvigandhi_1
1
answer
Magnetic moment of $K_3Fe(C_2O_4)_3.3H_2O$ is
jeemain
chemistry
physical-chemistry
class11
unit4
chemical-bonding-and-molecular-structure
bond-parameters
q23
difficult
asked
Mar 10, 2014
by
sreemathi.v
1
answer
$F_2C=CF_2$ is a monomer of
jeemain
aipmt
chemistry
cbse
unit5
class12
organic-chemistry
polymers
q23
easy
asked
Mar 6, 2014
by
thanvigandhi_1
1
answer
The molecule that does not possess a permanent dipole moment is
jeemain
chemistry
physical-chemistry
class11
unit4
chemical-bonding-and-molecular-structure
vsepr(valence-shell-electron-pair-repulsion)theory
q23
easy
asked
Mar 5, 2014
by
sreemathi.v
1
answer
If the first and $n^{th}$ term of a G.P. are $a$ and $b$ respectively and if $P$ is the product of the $n$ terms then prove that $P^2=(ab)^n$
cbse
class11
ch9
bookproblem
exercise9-3
difficult
sec-b
q23
math
sequences-and-series
asked
Mar 2, 2014
by
rvidyagovindarajan_1
1
answer
The correct sequence regarding basicity of following compounds are
jeemain
chemistry
unit13
class12
organic-chemistry
nitrogen
amines
q23
medium
asked
Feb 28, 2014
by
sreemathi.v
1
answer
Infrared radiation is detected by
jeemain
aipmt
physics
cbse
class12
ch8
electromagnetic-waves
q23
easy
asked
Feb 26, 2014
by
thanvigandhi_1
1
answer
Statement - 1: Phenol is more reactive than benzene towards elecrophilic substitution reaction . Statement - 2: In the case of phenol, the intermediate carbocation is more resonance stabilized.
jeemain
chemistry
class11
organic-chemistry
q23
difficult
basic-organic-chemistry
ch12
asked
Feb 21, 2014
by
meena.p
1
answer
In the below reaction only $CN^-$ ions are effective because
jeemain
chemistry
unit11
unit12
class12
organic-chemistry
oxygen
aldehyde-and-ketones
q23
easy
asked
Feb 19, 2014
by
sreemathi.v
1
answer
The root mean square speed of one mole of a monoatomic gas having molecular mass M is $U_{rms}$. The relation between the average kinetic energy (E) of the gas and $U_{rms}$ is:
jeemain
chemistry
physical-chemistry
class11
states-of-matter
kinetic-molecular-theory-of-gases
easy
q23
asked
Feb 14, 2014
by
sharmaaparna1
1
answer
If $ax+y-1=0$ ,$x+ay=0,x+y+a=0$ are concurrent then the value of $a^3-1$ is
jeemain
math
class11
coordinate-geometry
straight-lines
equations-of-a-line
ch10
q23
medium
asked
Feb 4, 2014
by
sreemathi.v
1
answer
Differential equation of all parabola with x axis as the axis and 4a as latus rectum .
jeemain
math
class12
ch9
differential-equations
linear-differential-equations
q23
easy
asked
Feb 3, 2014
by
meena.p
1
answer
A complex in which central atom carries zero oxidation state is
jeemain
chemistry
class12
coordination-compounds
unit9
q23
easy
asked
Jan 31, 2014
by
sreemathi.v
1
answer
In a p-n junction hole with kinetic energy 250 mev approaches the junction from m-side . The potential barrier is 200 mev. What will be its kinetic energy when it crosses the junction .
jeemain
physics
class12
unit19
ch14
q23
easy
asked
Jan 27, 2014
by
meena.p
1
answer
The most basic oxide is
jeemain
chemistry
class11
s-block-elements
unit10
q23
easy
asked
Jan 27, 2014
by
sreemathi.v
1
answer
$ ^{\sim}[(p \wedge q) \rightarrow (^{\sim}p V q)]$ is
jeemain
math
mathematical-reasoning
class11
ch14
difficult
implications-(tautology-contradiction.)
q23
asked
Jan 23, 2014
by
thanvigandhi_1
1
answer
Which of the following substance is not present in clear hard water
jeemain
chemistry
class11
hydrogen
unit9
q23
easy
asked
Jan 23, 2014
by
sreemathi.v
1
answer
Identify the converse of the statement: If x is a prime number then x is even.
jeemain
math
mathematical-reasoning
class11
ch14
medium
implications-(tautology-contradiction.)
q23
asked
Jan 20, 2014
by
thanvigandhi_1
1
answer
Solid component of the earth consisting of soil,rocks and mountains is called
jeemain
chemistry
class11
environmental-chemistry
unit14
q23
easy
asked
Jan 20, 2014
by
sreemathi.v
1
answer
Identify the quantifier in the sentence There exists a kingdom for every king in India.
jeemain
math
mathematical-reasoning
class11
ch14
easy
implications-(tautology-contradiction.)
q23
asked
Jan 17, 2014
by
thanvigandhi_1
1
answer
If X is a binomial variate with the range { 0,1,2,3,4,5,6 } and P(X = 2)=4P (x=4) then the parameter P of X is
jeemain
math
cbse
class12
probability
difficult
q23
asked
Jan 16, 2014
by
thanvigandhi_1
1
answer
A person has two children. If one of them is boy, then the probability that other is also a boy is
jeemain
math
cbse
class12
probability
medium
q23
asked
Jan 16, 2014
by
thanvigandhi_1
1
answer
If the total energy of an electron in a hydrogen like atom in an excited state is -3.4eV then the debroglie wavelength of the electron is
jeemain
chemistry
physical-chemistry
class11
unit2
atomic-structure
quantum-mechanical-model
q23
easy
asked
Jan 10, 2014
by
sreemathi.v
1
answer
Calculate molality of 1 litre solution of $93\%$ $H_2SO_4$ by volume.The density of solution is $1.84\; g$ $mL^{-1}$
sat
chemistry
stoichiometry and the mole concept
jeemain
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
stoichiometry
q23
difficult
asked
Jan 7, 2014
by
sreemathi.v
1
answer
If the chance that a ship will arrive safely at a port is $ \large\frac{9}{10}$, the chance that out of 5 ships expected to arrive at the port at least 4 will arrive safely is
jeemain
math
cbse
class12
probability
bionomial-distribution
easy
q23
asked
Jan 4, 2014
by
thanvigandhi_1
1
answer
Given that a,b$\xi$ c are in AP,which of the following is true?
jeemain
math
class11
ch9
sequences-and-series
easy
arithmetic-progression
q23
asked
Jan 2, 2014
by
yamini.v
1
answer
The line $\overrightarrow r=(4\hat i+2\hat j+\alpha \hat k)+\lambda(\hat i+\hat j+2\hat k)$ lies on the plane $2x-4y+z=7$ if $\alpha=?$
jeemain
math
class12
ch11
3d-geometry
equations-of-planes
easy
q23
asked
Dec 28, 2013
by
rvidyagovindarajan_1
1
answer
If $\lim\limits_{x\to 0}\large\frac{\log(3+x)-\log(3-x)}{x}$$=K$ the value of $K$ is
jeemain
math
class11
ch13
limits-and-derivatives
introduction to limits
easy
q23
asked
Dec 23, 2013
by
sreemathi.v
1
answer
Two thin lenses of focal lengths $f_1 \: and \: f_2$ are in contact and coxial. The power of the combination is :
aipmt
modelpaper
physics
2008
q23
asked
Dec 15, 2013
by
thanvigandhi_1
0
answers
Integrate : $\int \limits_0^{\infty} \large\frac{\log x}{1+x^2}$$dx$
jeemain
math
class12
ch7
integral-calculus
integration-by-subsitution
medium
q23
asked
Dec 13, 2013
by
meena.p
1
answer
For reaction $m^{x+}(aq)+xe^-\rightleftharpoons m(s)$ the nature of graph between $E_{m^{x+}/m}$ vs $\log[m^{x+}]$ is
jeemain
chemistry
unit8
redox-reactions-and-electrochemistry
q23
medium
asked
Dec 11, 2013
by
sreemathi.v
1
answer
The paramagnetism of $O_2$ molecule is believed to be due to the presence of two electrons with parallel spin in
jeemain
chemistry
physical-chemistry
class11
unit4
chemical-bonding-and-molecular-structure
valence-bond-theory
q23
medium
asked
Dec 9, 2013
by
sreemathi.v
1
answer
The risk of spoilage is less in salted pickles because of :
jeemain
eamcet
biology
2002
q23
asked
Dec 8, 2013
by
thanvigandhi_1
0
answers
An aromatic alkyne on treatment with $H_2SO_4$ gives acetophenone .The alkyne is
jeemain
chemistry
unit21
organic-chemistry
q23
difficult
basic-organic-chemistry
class11
ch12
asked
Dec 5, 2013
by
sreemathi.v
1
answer
Refer to the below reaction :
jeemain
chemistry
unit21
organic-chemistry
q23
medium
basic-organic-chemistry
class11
ch12
asked
Dec 3, 2013
by
sreemathi.v
1
answer
Scotoactive stomatal movement can be observed in the leaves of
jeemain
eamcet
biology
2001
q23
asked
Dec 1, 2013
by
thanvigandhi_1
0
answers
$CHCl_3$ is known as
jeemain
chemistry
unit15
p-block-elements
q23
easy
asked
Nov 27, 2013
by
sreemathi.v
1
answer
Find the value of determinant $\begin{vmatrix}1&x&y+z\\1&y&z+x\\1&z&x+y\end{vmatrix}$
jeemain
math
class12
ch4
determinants
q23
evaluate-determinants
difficult
asked
Nov 26, 2013
by
sreemathi.v
1
answer
Which of the following type of phytohormones resemble nucleic acids in some structural aspects :
jeemain
eamcet
biology
2000
q23
asked
Nov 24, 2013
by
thanvigandhi_1
0
answers
The plant without tuberous roots
jeemain
eamcet
biology
1999
q23
asked
Nov 22, 2013
by
thanvigandhi_1
0
answers
Inverse of the matrix $\begin{bmatrix}\cos 2\theta&-\sin 2\theta\\\sin 2\theta&\cos 2\theta\end{bmatrix}$ is
jeemain
math
class12
ch4
determinants
q23
adjoint-and-inverse
medium
asked
Nov 22, 2013
by
sreemathi.v
1
answer
If $f(x)=\begin{vmatrix}1 &x&x+1\\2x&x(x-1)&(x+1)x\\3x(x-1)&x(x-1)(x-2)&(x+1)x(x-1)\end{vmatrix}$ then $f(100)$ is equal to
jeemain
math
ch3
class12
matrices
q23
elementary-operation-(transformation)-of-a-matrix
easy
asked
Nov 20, 2013
by
sreemathi.v
1
answer
Assertion (A): Optical fibres are widely used in communication network. Reason (R): Optical fibers are small in size, light weight, flexible and there is no scope for interference in them.
jeemain
eamcet
physics
2004
q23
asked
Nov 20, 2013
by
meena.p
1
answer
Assertion (A): Optical fibres are widely used in communication network. Reason (R): Optical fibers are small in size, light weight, flexible and there is no scope for interference in them.
jeemain
eamcet
physics
2004
q23
asked
Nov 20, 2013
by
meena.p
0
answers
Volume of the flask in which species are transferred is double of the earlier flask. In which of the following reversible reactions, equilibrium will be shifted in the forward direction?
jeemain
aipmt
chemistry
equilibrium
medium
q23
biology
asked
Nov 15, 2013
by
mosymeow_1
1
answer
If $\cos \theta-4 \sin \theta=1$ then $\sin \theta+4 \cos \theta$ is equal to :
jeemain
eamcet
math
2005
q23
asked
Nov 11, 2013
by
meena.p
0
answers
Study the following lists
jeemain
eamcet
biology
2010
q23
asked
Nov 11, 2013
by
thanvigandhi_1
0
answers
Which of the following is not correct ?
jeemain
eamcet
chemistry
2005
q23
asked
Nov 11, 2013
by
meena.p
0
answers
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