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Recent questions tagged unit6
Questions
Keeping in mind the enthalpy of formation of HF and HCl i.e. -161 kJ and -92 kJ, respectively, which of the following statements do you think is incorrect?
jeemain
chemistry
class11
unit6
chemical-thermodynamics
difficult
asked
Feb 25, 2014
by
mosymeow_1
1
answer
The molar heat capacity of water at constant pressure, $C_P$ is $75JK^{-1}mol^{-1}$. When 1.0 kJ of heat is supplied to 100 g of water which is free to expand, the increase in temperature of water is
jeemain
chemistry
class11
unit6
chemical-thermodynamics
easy
asked
Feb 25, 2014
by
mosymeow_1
1
answer
Heat of combustion $\Delta H$ for $C(s), H_2(g)$ and $CH_4(g)$ are -94, -68 and -213 kcal/mol. Then $\Delta H$ for $C(s) + H_2(g) \rightarrow CH_4(g)$ is
jeemain
chemistry
class11
unit6
chemical-thermodynamics
difficult
asked
Feb 25, 2014
by
mosymeow_1
1
answer
Which of the following condition depicts a favourable condition for a spontaneous reaction?
sat
chemistry
chemical-reactions-and-thermochemistry
jeemain
class11
unit6
chemical-thermodynamics
easy
asked
Feb 25, 2014
by
mosymeow_1
1
answer
Assume the enthalpy of combustion of methane and $CH_3OH$ are $x$ and $y$ respectively. If the enthalpy of $CH_4 + \frac{1}{2}O_2 \rightarrow CH_3OH$ is negative, then which relation is correct?
jeemain
chemistry
class11
unit6
chemical-thermodynamics
difficult
asked
Feb 25, 2014
by
mosymeow_1
1
answer
Given three reaction below, $N_2(g) + 3H_2(g) \leftrightharpoons 2NH_3(g); \Delta H_1$, $H_1(g) + Cl_2(g) \leftrightharpoons 2HCl(g) ; \Delta H_2$, $NH_3 (g) + 3Cl_2 \leftrightharpoons NCl_3(g) + 3HCl(g); -\Delta H_3$. In the terms of $\Delta H_1, \Delta H_2$ and $\Delta H_3$, heat of formation of $NCl_3(g)$ is
jeemain
chemistry
class11
unit6
chemical-thermodynamics
easy
asked
Feb 25, 2014
by
mosymeow_1
1
answer
The following table lists the bond dissociation energy ($E_{diss}$) for single covalent bonds formed between C and atoms A, B, D, E. Which of the atoms has smallest size?
jeemain
chemistry
class11
unit6
chemical-thermodynamics
medium
asked
Feb 25, 2014
by
mosymeow_1
1
answer
What is the work done when 1 mol of water at 373 K vapourises against atmospheric pressure of 1.0 atmosphere? [Solve the question assuming ideal gas behaviour]
jeemain
chemistry
class11
unit6
chemical-thermodynamics
difficult
asked
Feb 25, 2014
by
mosymeow_1
1
answer
Given $\Delta H^\circ _{ioniz}$ (HCN) = 45.2 kJ $mol^{-1}$ and $\Delta H^\circ _{ioniz} (CH_3COOH)$ = 2.1 kJ $mol^{-1}$. Which one of the following fact is true?
jeemain
chemistry
class11
unit6
chemical-thermodynamics
easy
asked
Feb 24, 2014
by
mosymeow_1
1
answer
The heat evolved in combustion of benzene is given by the following equation: $C_6H_6 + \frac{15}{2} \rightarrow 3H_2O + 6CO_2$; $\Delta H= - 3264.6 kJ$ Which of the following quantities of heat will be evolved when 39 g of benzene are burnt in an open container?
jeemain
chemistry
class11
unit6
chemical-thermodynamics
difficult
asked
Feb 24, 2014
by
mosymeow_1
1
answer
The heat change for the following reaction at 298 K and constant pressure is +7.3 kcal. $A_2B(s) \rightarrow 2A(s) + \frac{1}{2} B_2(g)$; $\Delta H = + 7.3 kcal$ The heat change at constant volume would be
jeemain
chemistry
class11
unit6
chemical-thermodynamics
difficult
asked
Feb 24, 2014
by
mosymeow_1
1
answer
The enthalpy change at 298 K of the reaction $H_2O_2(l) \longrightarrow H_2O (l) + \frac{1}{2} O_2 (g)$ is -23.5 kcal $mol^{-1}$ and enthalpy of formation of $H_2O_2(l)$ is -44.8 kcal $mol^{-1}$. The enthalpy of formation of $H_2O(l)$ is
jeemain
chemistry
class11
unit6
chemical-thermodynamics
difficult
asked
Feb 24, 2014
by
mosymeow_1
1
answer
The work done on the system when one mole of an ideal gas at 500 K is compressed isothermally and reversibly to 1/10th of its original volume (R = 2 cal)
jeemain
chemistry
class11
unit6
chemical-thermodynamics
difficult
asked
Feb 24, 2014
by
mosymeow_1
1
answer
An ideal gas expands from $10^{-3} m^3$ to $10^{-2} m^3$ at 300 K, against a constant pressure of $10^5 N m^{-2}$. The work done on it is
jeemain
chemistry
class11
unit6
chemical-thermodynamics
easy
asked
Feb 24, 2014
by
mosymeow_1
1
answer
For the reaction between $CO_2$ and graphite $CO_2(g) + C(s) \longrightarrow 2CO(g)$ $\Delta H = +170.0 kJ$ and $\Delta S = 170 JK^{-1}$. The reaction is spontaneous at
jeemain
chemistry
class11
unit6
chemical-thermodynamics
medium
asked
Feb 24, 2014
by
mosymeow_1
1
answer
An engine operating between $100^\circ C$ and $0^\circ C$ takes 453.6 Kcal of heat. How much useful work can be done by it?
jeemain
chemistry
class11
unit6
chemical-thermodynamics
medium
asked
Feb 24, 2014
by
mosymeow_1
1
answer
What percent $T_1$ is of $T_2$ for a heat engine whose efficiency is 10%?
jeemain
chemistry
class11
unit6
chemical-thermodynamics
easy
asked
Feb 24, 2014
by
mosymeow_1
1
answer
The heat change at constant volume for the decomposition of silver(I) oxide is found to be 30.66 kJ. The heat change at constant pressure will be
jeemain
chemistry
class11
unit6
chemical-thermodynamics
difficult
asked
Feb 24, 2014
by
mosymeow_1
1
answer
At 298 K, the enthalpy change for a given reaction K is $-x$ cal/mol. If the reaction occurs spontaneously at 298 K, the entropy change at that temperature
jeemain
chemistry
class11
unit6
chemical-thermodynamics
easy
asked
Feb 24, 2014
by
mosymeow_1
1
answer
For the following thermodynamic process Dry ice $\longrightarrow CO_2$ (g)
sat
chemistry
chemical-reactions-and-thermochemistry
jeemain
class11
unit6
chemical-thermodynamics
easy
asked
Feb 24, 2014
by
mosymeow_1
2
answers
The sign of $\Delta G$ for the process of melting of ice at 273 K and 1 atm pressure is
jeemain
chemistry
class11
unit6
chemical-thermodynamics
easy
asked
Feb 24, 2014
by
mosymeow_1
1
answer
According to third law of thermodynamics, the entropy at 0 K is zero for
jeemain
chemistry
class11
unit6
chemical-thermodynamics
easy
asked
Feb 24, 2014
by
mosymeow_1
2
answers
The value of $\Delta S$ is negative in which of the following process?
sat
chemistry
chemical-reactions-and-thermochemistry
jeemain
class11
unit6
chemical-thermodynamics
easy
asked
Feb 24, 2014
by
mosymeow_1
2
answers
For the gaseous reaction involving the complete combustion of isobutane
jeemain
chemistry
class11
unit6
chemical-thermodynamics
medium
asked
Feb 24, 2014
by
mosymeow_1
1
answer
Enthalpy of neutralisation of all strong acids and strong bases has the same value because
jeemain
chemistry
class11
unit6
chemical-thermodynamics
easy
asked
Feb 23, 2014
by
mosymeow_1
1
answer
One gram of diamond atom of graphite and one gram atom of diamond were separately burnt to carbon dioxide. The amount of heat liberated were 393.5 kJ and 395.4 kJ respectively. It follows that
jeemain
chemistry
class11
unit6
chemical-thermodynamics
easy
asked
Feb 23, 2014
by
mosymeow_1
1
answer
X gm of ethanal was subjected to combustion in a bomb calorimeter. The heat produced is Y joules. Then
jeemain
chemistry
class11
unit6
chemical-thermodynamics
medium
asked
Feb 23, 2014
by
mosymeow_1
1
answer
The reaction $SO_2(g) + \frac{1}{2} O_2 (g) \longrightarrow SO_3(g)$ should be
jeemain
chemistry
class11
unit6
chemical-thermodynamics
easy
asked
Feb 23, 2014
by
mosymeow_1
1
answer
Which of the following relationship is not correct?
jeemain
chemistry
class11
unit6
chemical-thermodynamics
easy
asked
Feb 23, 2014
by
mosymeow_1
1
answer
At constant volume the heat of combustion of solid benzoic acid is -321.30 kJ at $27^\circ C$. The heat of combustion at constant pressure is
sat
chemistry
chemical-reactions-and-thermochemistry
jeemain
class11
unit6
chemical-thermodynamics
easy
asked
Feb 23, 2014
by
mosymeow_1
1
answer
A sphere of mass M and radius $R_2$ has a concentric cavity of radius $R_1$ as shown. The force F exerted by the sphere on a particle of mass m located at a distance r from the center of sphere varies as $(0 < r < \alpha)$
jeemain
physics
class11
unit6
gravitation
q81
medium
asked
Aug 30, 2013
by
meena.p
1
answer
A particle is fired upward with a speed of $20 \;Km/s$. The speed with which it will move in in interstellar space is
jeemain
physics
class11
unit6
gravitation
q100
medium
asked
Aug 30, 2013
by
meena.p
1
answer
Suppose universal gravitational constant starts to decrease, then
jeemain
physics
class11
unit6
gravitation
q99
medium
asked
Aug 30, 2013
by
meena.p
1
answer
If G is the universal gravitational constant and $\rho$ is the uniform density of a spherical planet. Then the shortest possible period of rotation of the planet can be
jeemain
physics
class11
unit6
gravitation
q98
medium
asked
Aug 30, 2013
by
meena.p
1
answer
A solid sphere of uniform density and radius 4 units is located with its center at origin O. Two spheres of equal radii/ units with their center $A(-2,0,0)$ and $B(2,0,0)$ respectively are taken out of the solid leaving behind cavities as shown Then
jeemain
physics
class11
unit6
gravitation
q97
medium
asked
Aug 30, 2013
by
meena.p
1
answer
If the angular velocity of a planet about its own axis is halved, the distance of geostationary satellite of this planet from the center of the planet will become
jeemain
physics
class11
unit6
gravitation
q96
easy
asked
Aug 30, 2013
by
meena.p
1
answer
The acceleration due to gravity on moon is only one sixth that of earth. If the earth and moon are assumed to have same densities the ratio of radii of moon and earth will be
jeemain
physics
class11
unit6
gravitation
q95
easy
asked
Aug 29, 2013
by
meena.p
1
answer
Period of revolution of an earth satellite close to surface of earth is 90 minutes. The time period of another satellite in an orbit at a distance three times the radius of earth from its surface will be
jeemain
physics
class11
unit6
gravitation
q94
easy
asked
Aug 29, 2013
by
meena.p
1
answer
The radius of planet is R. A satellite revolves around it in a circular orbit of radius r with angular speed 'w'. The acceleration due to gravity on the planet's surface will be
jeemain
physics
class11
unit6
gravitation
q93
easy
asked
Aug 29, 2013
by
meena.p
1
answer
A planet is moving in an elliptical path around the sun of shown speed of planet in position P and Q are $v_1$ and $v_2$ respectively with $SP= r_1\;and SQ=r_2$ then $v_1/v_2$ is equal to
jeemain
physics
class11
unit6
gravitation
q92
easy
asked
Aug 29, 2013
by
meena.p
1
answer
The magnitude of potential energy per unit mass of object at surface of earth is E. then the escape velocity of the object is
jeemain
physics
class11
unit6
gravitation
q91
easy
asked
Aug 29, 2013
by
meena.p
1
answer
Speed of a planet in an elliptical orbit with semi major axis 'a' about sum of mass M at a distance r from the sun is
jeemain
physics
class11
unit6
gravitation
q90
medium
asked
Aug 29, 2013
by
meena.p
1
answer
A smooth tunnel is dug along the radius of earth that ends at center. A ball is released from the surface of earth along tunnel. What is the velocity when it strike the center?
jeemain
physics
class11
unit6
gravitation
q89
medium
asked
Aug 29, 2013
by
meena.p
1
answer
The density of case of a planet is $s_1$ and that of the outer shell is $s_2$.The radius of case and that of the planet are R and 2R respectively. Gravitational acceleration at the surface of the planet is same as at a depth R. Find $\large\frac{s_1}{s_2}$
jeemain
physics
class11
unit6
gravitation
q88
difficult
asked
Aug 29, 2013
by
meena.p
1
answer
A uniform rod of length $'l'$ whose mass per unit length is $\lambda$. The gravitational force on a particle of mass m located at a distance d from one end of the rod as shown is
jeemain
physics
class11
unit6
gravitation
q87
difficult
asked
Aug 29, 2013
by
meena.p
1
answer
Two satellites are moving in a common plane along circular paths. with one having angular velocity $w_1=1.09 \times 10^{-3} rad/s$ and another $w_2=1.08 \times 10^{-3}rad /s$. Find time interval which seperates the periodic approaches of the satellites to each other over minimum distance, if they are revolving in opposite sense.
jeemain
physics
class11
unit6
gravitation
q86
medium
asked
Aug 26, 2013
by
meena.p
1
answer
If a planet orbiting the sun in a circular orbit suddenly stops, it will fall onto the sun in a time n(T) where T is the period of planets revolution , then n is
jeemain
physics
class11
unit6
gravitation
q85
difficult
asked
Aug 26, 2013
by
meena.p
1
answer
An artificial satellite of mass m moves in an orbit whose radius is n times the radius of earth. Assuming the resistance to the motion is proportional to square of velocity ie $F= av^2$ where a is a constant. How long will the satellite take to fall to earth. M-mass of earth R- radius of earth
jeemain
physics
class11
unit6
gravitation
q84
difficult
mock
asked
Aug 26, 2013
by
meena.p
1
answer
A body of mass m ascends from the earth's surface with zero initial velocity due to action of two forces as shown. The force $F$ varying with $h$ as $\hat F=-2m \vec {g} (1-ah)$ where a is constant. Find the maximum height atained by the body t
jeemain
physics
class11
unit6
gravitation
q83
difficult
asked
Aug 26, 2013
by
meena.p
1
answer
If a body is to be projected vertically upwards from the surface of the earth to reach a height nR then the velocity with which it is to be projected is
jeemain
physics
class11
unit6
gravitation
q82
difficult
asked
Aug 26, 2013
by
meena.p
1
answer
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