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Recent questions tagged unit6
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In extraction of iron $Fe_2O_3$ is reduced by
jeemain
cbse
chemistry
class12
unit6
general-principals-and-processes-of-isolation-of-metals
q10
medium
asked
Mar 17, 2014
by
meena.p
1
answer
The purest zinc is made
jeemain
cbse
chemistry
class12
unit6
general-principals-and-processes-of-isolation-of-metals
q9
medium
asked
Mar 17, 2014
by
meena.p
1
answer
The ares of $Ag$ and $Cu$ are concentrated using their solubility in
jeemain
cbse
chemistry
class12
unit6
general-principals-and-processes-of-isolation-of-metals
q8
medium
asked
Mar 17, 2014
by
meena.p
1
answer
Silver is refined by
jeemain
cbse
chemistry
class12
unit6
general-principals-and-processes-of-isolation-of-metals
q7
medium
asked
Mar 17, 2014
by
meena.p
1
answer
Among the following the maximum amount of carbon present in
jeemain
cbse
chemistry
class12
unit6
general-principals-and-processes-of-isolation-of-metals
q6
medium
asked
Mar 17, 2014
by
meena.p
1
answer
During the extraction of copper from chal copy rites,iron, Si moved as
jeemain
cbse
chemistry
class12
unit6
general-principals-and-processes-of-isolation-of-metals
q5
medium
asked
Mar 17, 2014
by
meena.p
1
answer
Bi semicopper is
jeemain
cbse
chemistry
class12
unit6
general-principals-and-processes-of-isolation-of-metals
q4
medium
asked
Mar 17, 2014
by
meena.p
1
answer
Copper is extracted from its sulphiate are by
jeemain
cbse
chemistry
class12
unit6
general-principals-and-processes-of-isolation-of-metals
q3
medium
asked
Mar 15, 2014
by
meena.p
1
answer
By which of the following reactions is copper obtained?
jeemain
cbse
chemistry
class12
unit6
general-principals-and-processes-of-isolation-of-metals
q2
medium
asked
Mar 15, 2014
by
meena.p
1
answer
Matte contains
jeemain
cbse
chemistry
class12
unit6
general-principals-and-processes-of-isolation-of-metals
q1
medium
asked
Mar 15, 2014
by
meena.p
1
answer
In exothermic reaction
jeemain
cbse
chemistry
chemical-thermodynamics
class11
unit6
easy
asked
Mar 14, 2014
by
meena.p
1
answer
Bomb calorimeter used for determining change in internal energy at constant _____
sat
chemistry
chemical-reactions-and-thermochemistry
jeemain
cbse
chemical-thermodynamics
class11
unit6
easy
asked
Mar 14, 2014
by
meena.p
1
answer
Which of the following statement is false
sat
chemistry
chemical-reactions-and-thermochemistry
jeemain
cbse
chemical-thermodynamics
class11
unit6
easy
asked
Mar 14, 2014
by
meena.p
1
answer
For spontaneous reaction $\Delta G$ is
sat
chemistry
chemical-reactions-and-thermochemistry
jeemain
cbse
chemical-thermodynamics
class11
unit6
easy
asked
Mar 14, 2014
by
meena.p
1
answer
During fusion, the entropy of the system
sat
chemistry
chemical-reactions-and-thermochemistry
jeemain
cbse
chemical-thermodynamics
class11
unit6
easy
asked
Mar 14, 2014
by
meena.p
1
answer
At constant temperature and pressure which one of the following statements is correct for the reaction? $CO_{(g)} +\large\frac{1}{2}$$O_2 (g) \longrightarrow CO_2(g)$
sat
chemistry
chemical-reactions-and-thermochemistry
jeemain
cbse
chemical-thermodynamics
class11
unit6
easy
asked
Mar 14, 2014
by
meena.p
1
answer
In a reversible adiabatic change $\Delta S$ is
sat
chemistry
chemical-reactions-and-thermochemistry
jeemain
cbse
chemical-thermodynamics
class11
unit6
easy
asked
Mar 14, 2014
by
meena.p
1
answer
In which of the following process does the entropy decrease?
jeemain
cbse
chemistry
chemical-thermodynamics
class11
unit6
medium
asked
Mar 14, 2014
by
meena.p
1
answer
Heat of neutralization of a strong acid and weak base is
sat
chemistry
chemical-reactions-and-thermochemistry
jeemain
cbse
chemical-thermodynamics
class11
unit6
medium
asked
Mar 14, 2014
by
meena.p
1
answer
In an exothermic reaction , heat is
sat
chemistry
chemical-reactions-and-thermochemistry
jeemain
cbse
chemical-thermodynamics
class11
unit6
medium
asked
Mar 14, 2014
by
meena.p
1
answer
When a gas at high pressure expands into a region of low pressure , then its temperature
jeemain
cbse
chemistry
chemical-thermodynamics
class11
unit6
medium
asked
Mar 14, 2014
by
meena.p
1
answer
For an ideal gas at constant temperature , $C_v$ is
jeemain
cbse
chemistry
class11
unit6
medium
asked
Mar 14, 2014
by
meena.p
1
answer
Two moles of an ideal gas expand spontaneously into a vaccum. The work done is
jeemain
cbse
chemistry
chemical-thermodynamics
class11
unit6
medium
asked
Mar 13, 2014
by
meena.p
1
answer
The Joule-Thomson expansion of an ideal gas is an
jeemain
cbse
chemistry
chemical-thermodynamics
class11
unit6
medium
asked
Mar 13, 2014
by
meena.p
1
answer
In isothermal change which of the following parameter is constant
jeemain
cbse
chemistry
chemical-thermodynamics
class11
unit6
medium
asked
Mar 13, 2014
by
meena.p
1
answer
A system which can change neither matter nor energy with the surroundings is called
jeemain
cbse
chemistry
chemical-thermodynamics
class11
unit6
medium
asked
Mar 13, 2014
by
meena.p
1
answer
Calculate the enthalpy change when $50\; ml$ of $0.01\; M Ca(OH)_2$ reacts with $25\; ml$ of $0.01 \;M HCl.$ Given that $\Delta H^0_{neut}$ of a strong acid and strong base is $140$ cal/ equivalent
jeemain
cbse
chemistry
chemical-thermodynamics
class11
unit6
difficult
asked
Mar 13, 2014
by
meena.p
1
answer
The heat of neutralization is highest in
sat
chemistry
chemical-reactions-and-thermochemistry
jeemain
cbse
chemical-thermodynamics
class11
unit6
difficult
asked
Mar 13, 2014
by
meena.p
1
answer
For the reaction : $C_7H_8(I)+9O_2(g) \longrightarrow 7CO_2(g) +4H_2O(I)$, the calculated heat of reaction is $232\; kJ/mol$ and observed heat of reaction is $50.4\; kJ/mol,$ then the resonance energy is
jeemain
cbse
chemistry
chemical-thermodynamics
class11
unit6
difficult
asked
Mar 13, 2014
by
meena.p
1
answer
A system is taken from state A to state B along two different paths 1 and 2. The Work done on the system along these two path is $W_1$ and $W_2$ The heat absorbed by the system along these paths are $Q_1$ and $Q_2$ respectively. Then
jeemain
cbse
chemistry
chemical-thermodynamics
class11
unit6
difficult
asked
Mar 13, 2014
by
meena.p
1
answer
The process in which heat is neither allowed to enter nor allowed to leave the system but in which temperature changes in known as
jeemain
cbse
chemistry
chemical-thermodynamics
class11
unit6
difficult
asked
Mar 13, 2014
by
meena.p
1
answer
Inversion Temperature is
jeemain
cbse
chemistry
chemical-thermodynamics
class11
unit6
difficult
asked
Mar 13, 2014
by
meena.p
1
answer
Which is equal to the total work done?
jeemain
cbse
chemistry
chemical-thermodynamics
class11
unit6
difficult
asked
Mar 13, 2014
by
meena.p
1
answer
For an ideal gas
jeemain
cbse
chemistry
chemical-thermodynamics
class11
unit6
difficult
asked
Mar 13, 2014
by
meena.p
1
answer
$100\; mL$ of $ 0.10M\; HCl$ is mixed with $100\; mL$ of $0.10M\; NaOH.$ The solution temperature rises by $6.0 ^{\circ}C.$ Calculate the enthalpy of neutralization per mole of $HCl.$
sat
chemistry
chemical-
reactions-and-thermochemistry
jeemain
cbse
chemical-thermodynamics
class11
unit6
difficult
asked
Mar 13, 2014
by
meena.p
1
answer
An ideal Carnot heat engine operates on a temperature difference of $210$ degrees. One third of the heat absorbed from the source is discharged to the sink. If the work done per cycle is $400 \;J$. The amount of heat released $(q_1)$ at the sink is
jeemain
cbse
chemistry
chemical-thermodynamics
class11
unit6
difficult
asked
Mar 13, 2014
by
meena.p
1
answer
An ideal Carnot heat engine operates on a temperature difference of $210$ degrees. One third of the heat absorbed from the source is discharged to the sink. If the work done per cycle is $400\; J.$ The amount of heat absorbed $(q_2)$ by an engine at source is _________
jeemain
cbse
chemistry
chemical-thermodynamics
class11
unit6
difficult
asked
Mar 13, 2014
by
meena.p
1
answer
An ideal Carnot heat engine operates on a temperature difference of $210$ degrees. One third of the heat absorbed from the source is discharged to the sink. If the work done per cycle is $400\; J$. Efficiency $(\eta)$ of an ideal carnot heat engine is
jeemain
cbse
chemistry
chemical-thermodynamics
class11
unit6
difficult
asked
Mar 13, 2014
by
meena.p
1
answer
An ideal Carnot heat engine operates on a temperature difference of $210\;$ degrees. One third of the heat absorbed from the source is discharged to the sink. If the work done per cycle is $400\; J.$ Sink $(T_1)$ and Source $(T_2)$ temperatures respectively are
jeemain
cbse
chemistry
chemical-thermodynamics
class11
unit6
difficult
asked
Mar 13, 2014
by
meena.p
1
answer
In an open beaker held at $27^{\circ}C$ and $1\; atm$ pressure containing dilute sulphuric acid, $100\; g$ zinc were added. The work done by the liberated gas is _______
jeemain
cbse
chemistry
chemical-thermodynamics
class11
unit6
difficult
asked
Mar 13, 2014
by
meena.p
1
answer
For which of the following change $\Delta H = \Delta E?$
sat
chemistry
chemical-reactions-and-thermochemistry
jeemain
cbse
chemical-thermodynamics
class11
unit6
difficult
asked
Mar 13, 2014
by
meena.p
1
answer
The enthalpy of sublimation of iodine is 62.8 kJ/mol. The bond dissociation energies for $Cl_2, I_2$ and ICl are 242.3, 151.0 and 211.3 kJ/mol, respectively. The standard enthalpy of formation of ICl(g) is nearly equal to
jeemain
chemistry
class11
unit6
chemical-thermodynamics
difficult
asked
Mar 1, 2014
by
mosymeow_1
1
answer
The following equation shows the conversion of limes stone to lime $CaCO_3(s)\longrightarrow CaO(s) + CO_2(g)$. The values of $\Delta H^\circ$ and $\Delta S^\circ$ are $+179.1\; kJ$ and $160.2\; J/K$ respectively at $298\; K$ and $1\; bar$. Assuming that $\Delta H^\circ$ and $\Delta S^\circ$ do not change with temperature, minimum temperature above which conversion of lime stone to lime will be spontaneous is
jeemain
chemistry
class11
unit6
chemical-thermodynamics
medium
mock
asked
Feb 28, 2014
by
mosymeow_1
1
answer
Conversion of A to B is carried out by the following process: $\Delta S(A\rightarrow C)=50eV, \Delta S(C\rightarrow B)=30eV, \Delta S(B\rightarrow D) = 20 eV$, where eV, where eV, is entropy unit, then $\Delta S(A\rightarrow B)$ is
jeemain
chemistry
class11
unit6
chemical-thermodynamics
medium
asked
Feb 28, 2014
by
mosymeow_1
1
answer
The enthalpy of hydrogenation of cyclohexene is -119.5 kj/mol. What is the enthalpy of benzene, if its resonance energy is -150.4 kJ/mol?
jeemain
chemistry
class11
unit6
chemical-thermodynamics
difficult
asked
Feb 28, 2014
by
mosymeow_1
1
answer
For the formation of carbon monoxide (CO) from the elements at 298 K $(\Delta H - \Delta U)$ is (R=8.314 $JK^{-1}mol^{-1}$)
sat
chemistry
chemical-reactions-and-thermochemistry
jeemain
class11
unit6
chemical-thermodynamics
medium
asked
Feb 28, 2014
by
mosymeow_1
1
answer
Given, standard enthalpy of formation $(\Delta _f H^\circ)$ at 298 k for methane is -74.8 kJ/mol. What other information is required to determine the average energy for C-H bond formation would be
jeemain
chemistry
class11
unit6
chemical-thermodynamics
medium
asked
Feb 28, 2014
by
mosymeow_1
1
answer
One mole of monoatomic ideal gas at T (K) is expanded from 1 L to 2 L adiabitcally under constant external pressure of 1 atm. The final temperature of gas in kelvin is
jeemain
chemistry
class11
unit6
chemical-thermodynamics
difficult
asked
Feb 28, 2014
by
mosymeow_1
1
answer
The enthalpy of vaporisation of a liquid is 30 kJ/mol and entropy of vaporisation is 75 $Jmol^{-1}K^{-1}$. What is the boiling point of the liquid at 1 atm?
jeemain
chemistry
class11
unit6
chemical-thermodynamics
difficult
asked
Feb 28, 2014
by
mosymeow_1
1
answer
Which of the following reactions will define $\Delta H^\circ _f$?
jeemain
chemistry
class11
unit6
chemical-thermodynamics
medium
asked
Feb 28, 2014
by
mosymeow_1
1
answer
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