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Recent questions tagged q39
Questions
Calculate the enthalpy change ($ \Delta H$) of the following reaction: \[\] $2C_2H_2(g) + 5O_2(g) \rightarrow 4CO_2(g) + 2H_2O(g)$ given average bond energies of various bonds, i.e, $C-H,\: CC,\: O=O,\: C=O,\: O-H$ as 414, 814, 499, 724 and 640 kJ/mol respectively.
jeemain
physics
thermodynamics
cbse
class11
class12
q39
medium
asked
Mar 16, 2014
by
thanvigandhi_1
1
answer
Match the following column-I and column-II
jeemain
chemistry
physical-chemistry
class11
unit4
chemical-bonding-and-molecular-structure
vsepr(valence-shell-electron-pair-repulsion)theory
q39
difficult
asked
Mar 11, 2014
by
sreemathi.v
1
answer
The addition homopolymers are
jeemain
aipmt
chemistry
cbse
unit5
class12
organic-chemistry-polymers
q39
medium
asked
Mar 7, 2014
by
thanvigandhi_1
1
answer
Based on VSPER theory,the number of 90 degree F-Br F angles in $BrF_5$ is
jeemain
chemistry
physical-chemistry
class11
unit4
chemical-bonding-and-molecular-structure
vsepr(valence-shell-electron-pair-repulsion)theory
q39
medium
asked
Mar 6, 2014
by
sreemathi.v
1
answer
Pick out among the following species not isoelectronic with $CO_2:$
jeemain
chemistry
physical-chemistry
class11
unit4
chemical-bonding-and-molecular-structure
vsepr(valence-shell-electron-pair-repulsion)theory
q39
easy
asked
Mar 5, 2014
by
sreemathi.v
1
answer
When the below one is heated with 1 equivalent of $CH_3NH_2$ then the product is
jeemain
chemistry
unit13
class12
organic-chemistry
nitrogen
amines
q39
medium
asked
Mar 3, 2014
by
sreemathi.v
1
answer
A beam of light travelling along $ x$ - axis is described by the electric field $E_y = (600 V/m) \sin \omega (t - x/c)$ then maximum magnetic force on a charge $q = 2e$, moving along $y$ - axis with a speed of $3.0 \times 10^7m/s$ is $(e = 1.6 \times 10^{-19} C)$
jeemain
aipmt
physics
cbse
class12
ch8
electromagnetic-waves
q39
medium
asked
Feb 27, 2014
by
thanvigandhi_1
1
answer
The bond between carbon atom (1) and carbon atom (2) in compound $N \equiv C_{(1)} -CH_{(2)}H \equiv CH_2$ involves the hybrid as
jeemain
chemistry
class11
organic-chemistry
q39
medium
basic-organic-chemistry
ch12
asked
Feb 22, 2014
by
meena.p
1
answer
Predict the product in the following : $CH_3CHO+4HCHO\quad\underrightarrow{\text{Conc aq NaOH}}$
jeemain
chemistry
unit11
unit12
class12
organic-chemistry
oxygen
aldehyde-and-ketones
q39
medium
asked
Feb 20, 2014
by
sreemathi.v
1
answer
A certain amount of an ideal gas occupies a volume of $1.0m^3$ at a given temperature and pressure. What would be its volume after reducing its pressure to half the initial value and raising the temperature twice the initial value?
jeemain
chemistry
physical-chemistry
class11
unit5
states-of-matter
ideal-gas-equation
easy
q39
asked
Feb 15, 2014
by
sharmaaparna1
1
answer
What is the conic represent $x^2+2x+y+1=0$
jeemain
math
class11
coordinate-geometry-conic-sections
parabola
ch11
q39
easy
asked
Feb 5, 2014
by
sreemathi.v
1
answer
General solution of differential equation: $\large\frac{dy}{dx}$$=xe^{y-x^2}$
jeemain
math
class12
ch9
differential-equations
formation-of-differential-equations
q39
easy
asked
Feb 4, 2014
by
meena.p
1
answer
Given $ n=10, \: \Sigma x = 3,\: \Sigma x^2=8,\: \Sigma y^2=9,\: \Sigma xy=3$ Find correlation coefficient
jeemain
math
cbse
class11
statistics
analysis-of-frequency-distributions-(correlation-coefficient)
difficult
q39
asked
Jan 31, 2014
by
thanvigandhi_1
1
answer
Which one of the following has a square planar geometry
jeemain
chemistry
class12
coordination-compounds
unit9
q39
medium
asked
Jan 31, 2014
by
sreemathi.v
1
answer
What is the emitter current $I_E$ in a transfer where base current $I_B$ is $20 \mu A$ and $\beta =40$
jeemain
physics
class12
unit19
ch14
q39
medium
transistors
semiconductor-electronics
asked
Jan 28, 2014
by
meena.p
1
answer
The ashes of plants contain alkali-metals and 90% of which is
jeemain
chemistry
class11
s-block-elements
unit10
q39
medium
asked
Jan 27, 2014
by
sreemathi.v
1
answer
Hyperol is a addition product of $H_2O_2$ with
jeemain
chemistry
class11
hydrogen
unit9
q39
medium
asked
Jan 23, 2014
by
sreemathi.v
1
answer
Which of the following is a true statement?
jeemain
math
mathematical-reasoning
class11
ch14
medium
statements
q39
asked
Jan 21, 2014
by
thanvigandhi_1
1
answer
Supersonic jets cause pollution by thinning of
jeemain
chemistry
class11
environmental-chemistry
unit14
q39
medium
asked
Jan 20, 2014
by
sreemathi.v
1
answer
In a probability distribution of a random variable X, the sum of probability is always
jeemain
math
cbse
class12
probability
easy
q39
asked
Jan 15, 2014
by
thanvigandhi_1
1
answer
Determine the element of lowest atomic number that contains a complete d subshell in the ground state.
jeemain
chemistry
physical-chemistry
class11
unit2
atomic-structure
quantum-mechanical-model
q39
easy
asked
Jan 10, 2014
by
sreemathi.v
1
answer
If $0.5$ mole of $BaCl_2$ is mixed with 0.2 mole of $Na_3PO_4$,the maximum number of moles of $Ba_3(PO_4)_2$ that can be formed is :
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
mole-concept-and-molar-masses
q39
easy
asked
Jan 8, 2014
by
sreemathi.v
1
answer
25ml of a solution containing HCl and $H_2SO_4$ required for neutralized 24.10ml of N/2 caustic soda solution.25ml of the same solution on precipitation with $BaCl_2$ yielded 0.5218gm $BaSO_4$.What wt of each acid is contained in one litre of the solution?
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
stoichiometry
q39
difficult
asked
Jan 8, 2014
by
sreemathi.v
1
answer
How many terms of the series $6, 3, \large\frac{3}{2}$------ will make a sum of $\large\frac{765}{64}$.
jeemain
math
class11
ch9
sequences-and-series
easy
relationship-between-ap-and-gm
q39
asked
Jan 2, 2014
by
yamini.v
1
answer
The point on the line $\overrightarrow r=(-2\hat i-\hat j+3\hat k)+\lambda(3\hat i+2\hat j+2\hat k)$ which is at a distance of $3\sqrt 2$ units from the point $(1,2,3)$ is ?
jeemain
math
class11
ch12
3d-geometry
distance-between-two-points
medium
q39
asked
Jan 1, 2014
by
rvidyagovindarajan_1
1
answer
$\lim\limits_{x\to \infty}\big(\large\frac{x+1}{x+2}\big)^{2x+1}$ is
jeemain
math
class11
ch13
limits-and-derivatives
introduction to limits
easy
q39
asked
Dec 23, 2013
by
sreemathi.v
1
answer
In a a.c circuit the e.m.f (e) and the current (i) at any instant are given respectively by :
aipmt
modelpaper
physics
2008
q39
asked
Dec 16, 2013
by
thanvigandhi_1
0
answers
For first order decomposition reaction,$A(g)\rightarrow B(g)$ rate of formation of B against time t will be:
jeemain
chemistry
unit9
chemical-kinetics
q39
medium
asked
Dec 16, 2013
by
sreemathi.v
1
answer
$\large\frac{d}{dx} \int \limits_{x^2}^{x^3} \bigg(\large\frac {1}{lnt} \bigg)$$dx$
jeemain
math
class12
ch7
integral-calculus
definite-integrals-as-limit-of-sum
easy
q39
asked
Dec 14, 2013
by
meena.p
1
answer
Among the following,the intensive property is (are)
jeemain
chemistry
unit8
redox-reactions-and-electrochemistry
q39
easy
asked
Dec 12, 2013
by
sreemathi.v
1
answer
Gloriosa superba is a good example of one of the following :
jeemain
eamcet
biology
2002
q39
asked
Dec 9, 2013
by
thanvigandhi_1
0
answers
Reactant B of the reaction is
jeemain
chemistry
unit21
organic-chemistry
q39
difficult
basic-organic-chemistry
class11
ch12
asked
Dec 5, 2013
by
sreemathi.v
1
answer
What is the position of the multilayered sterile tissue in the transverse section of an young anther
jeemain
eamcet
biology
2001
q39
asked
Dec 1, 2013
by
thanvigandhi_1
1
answer
Hg sticks to surface of glass when it reacts with
jeemain
chemistry
unit15
p-block-elements
q39
medium
asked
Nov 27, 2013
by
sreemathi.v
1
answer
Malacophily is observed in the species of one of the following :
jeemain
eamcet
biology
2000
q39
asked
Nov 25, 2013
by
thanvigandhi_1
1
answer
What is the decreasing order of strength of the bases $OH^-, NH_2^- , H-C\equiv C^-$ and $CH_3CH_2^-$ ?
jeemain
aipmt
chemistry
equilibrium
difficult
q39
biology
asked
Nov 23, 2013
by
mosymeow_1
1
answer
The following is a xerophyte containing air spaces in the stem and roots
jeemain
eamcet
biology
1999
q39
asked
Nov 23, 2013
by
thanvigandhi_1
0
answers
If $A=\begin{bmatrix}a&b\\b&a\end{bmatrix}$ and $A^2=\begin{bmatrix}\alpha&\beta\\\beta&\alpha\end{bmatrix}$ then
jeemain
math
class12
ch3
matrices
q39
operations-on-matrices
easy
asked
Nov 21, 2013
by
sreemathi.v
1
answer
If $0\leq x\leq \large\frac{\pi}{2}$ and $81^{\large \sin^2x}+81^{\large\cos^2x}=30$ then $x$ is equal to
jeemain
math
class11
ch3
trigonometric-functions
q39
trigonometric-equations
difficult
asked
Nov 19, 2013
by
sreemathi.v
1
answer
The value of $a$ for which the volume of the parallelopiped formed by vectors $\hat i+a\hat j+\hat k,\:\:\hat j+a\hat k\:\:and\:\: a\hat i+\hat k$ becomes minimum is ?
jeemain
math
class12
ch10
vector-algebra
difficult
vector-product
q39
asked
Nov 12, 2013
by
rvidyagovindarajan_1
1
answer
Study the following lists
jeemain
eamcet
biology
2010
q39
asked
Nov 12, 2013
by
thanvigandhi_1
0
answers
Observe the following statements:A: Three vectors are coplanar if one of them is expressible as a linear combination of the other two. R: Any three coplanar vectors are linearly dependent . Then which of the following is true?
jeemain
eamcet
math
2005
q39
asked
Nov 12, 2013
by
meena.p
1
answer
Which of the following is not correct ?
jeemain
eamcet
chemistry
2005
q39
asked
Nov 11, 2013
by
meena.p
0
answers
Particles and their anti- particles have:
jeemain
eamcet
physics
2005
q39
asked
Nov 8, 2013
by
meena.p
1
answer
If A and B are two independent events such that $P(B)=\large\frac{2}{7}$$,P(A \cup B)=0.8,$ then $P(A)$ is equal to :
jeemain
eamcet
math
2006
q39
asked
Nov 6, 2013
by
meena.p
1
answer
$CH_3CH_2OH \longrightarrow CH_3CHO \longrightarrow Cl_3CCHO $ In above reactions the role of $Cl_2$ in step -I and Step-2 respectively is :
jeemain
eamcet
chemistry
2006
q39
asked
Nov 5, 2013
by
meena.p
1
answer
A free neutron decays spontaneously into:
jeemain
eamcet
physics
2006
q39
asked
Oct 29, 2013
by
meena.p
1
answer
Identify wrong pair of statements from the following :
jeemain
eamcet
biology
2011
q39
asked
Oct 27, 2013
by
thanvigandhi_1
1
answer
Let $\overrightarrow {a}=a_1\hat i+a_2 \hat j+a_3 \hat k$ Assertion (A): The identify $|\overrightarrow a \times \hat i |^2+|\overrightarrow a \times \hat j|^2+|\overrightarrow a \times \hat k| ^2=2 | \overrightarrow a |^2$ holds for $\overrightarrow {a}$. Reason (R): $\overrightarrow {a} \times \hat i =a_3 \hat j- a_2 \hat k, \overrightarrow a \times \hat j= a_1 \hat k- a_3 \hat i, \overrightarrow a \times \hat k=a_2 \hat i- a_1 \hat j$ Which of the following is correct ?
jeemain
eamcet
math
2007
q39
asked
Oct 25, 2013
by
meena.p
1
answer
A silicon (atomic weight=28) chip used in an integrated circuit of a microcomputer has a mass of 5.68 mg. How many silicon (Si) atoms are present in this chip.
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
mole-concept-and-molar-masses
q39
medium
asked
Oct 25, 2013
by
sreemathi.v
1
answer
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