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Recent questions in Class11

Questions >> JEEMAIN and NEET >> Physics >> Class11

Class11

Units and Measurement

Motion in a Straight Line

Motion in a Plane

Work, Power and Energy

System of Particles and Rotational Motion

Mechanical Properties of Solids

Mechanical Properties of Fluids

Thermal Properties of Matter

Kinetic Theory of Gases

The work done in process ABC (in atm litre)

asked Mar 21, 2014 by yamini.v

1 answer

A gas is expanded from volume $\;V_{0}\;$ to $\;2V_{0}\;$ under three different processes . Process 1 is isobaric , process 2 is isothermal and process 3 is adiabatic . Let $\;\bigtriangleup u_{1}\;, \bigtriangleup u_{2}\;$ and $\;\bigtriangleup u_{3}\;$ be the change in internal energy of the gas in the three processes . Then :

asked Mar 21, 2014 by yamini.v

1 answer

Work done by gas in cyclic process ABCDA .

asked Mar 21, 2014 by yamini.v

1 answer

During an adiabatic process , the pressure of a gas is formed to be proportional to the cube of its absolute temperature the value of r for the gas is

asked Mar 21, 2014 by yamini.v

1 answer

A diamotic gas is heated at constant pressure such that it performs 4 J of work . Find the heat supplied to the gas

asked Mar 21, 2014 by yamini.v

1 answer

P - T graph of an ideal gas is shown . Density of the gas at A is ' d ' and then density of the gas at B is

asked Mar 21, 2014 by yamini.v

1 answer

In a thermodynamic process 400 J of heat is given to a gas and 100 J of work is also done on set . Calculate the change in internal energy of the gas .

asked Mar 21, 2014 by yamini.v

1 answer

The ratio of molar heat capacities in path 1 and path 2

asked Mar 21, 2014 by yamini.v

1 answer

The internal energy of a system remains constant when it undergoes

asked Mar 21, 2014 by yamini.v

1 answer

In P - V graph

asked Mar 21, 2014 by yamini.v

1 answer

The work done in cyclic process is

asked Mar 21, 2014 by yamini.v

1 answer

In the following diagram , the net amount of work done will be

asked Mar 21, 2014 by yamini.v

1 answer

In the following two isothermals shown at temperatures $\;T_{1}\;$ and $\;T_{2}\;$ . Which of the following relations is correct ?

asked Mar 21, 2014 by yamini.v

1 answer

A gas is taken along a cyclic path as shown ABCDA in P - V diagram in two ways the change in internal energy is

asked Mar 21, 2014 by yamini.v

1 answer

S1: Heat absorbed during isothermal expansion of ideal gas in vacuum is zero. \[\] S2: Volume occupied by molecules of ideal gas is zero.

asked Mar 20, 2014 by thanvigandhi_1

1 answer

S1: $ \Delta G$ and $ \Delta H$ of a reaction always have the same sign. \[\] S2: $ \Delta G_f^{\circ}$ of carbon(graphite) is equal to zero.

asked Mar 20, 2014 by thanvigandhi_1

1 answer

. S1: $ \Delta H$ of a reaction is independent of temperature. \[\] S2: $\Delta H^{\circ}$ of a reaction = $ \sum H^{\circ}$(Products) - $ \sum H^{\circ}$(Reactants)

asked Mar 20, 2014 by thanvigandhi_1

1 answer

A system is taken from state A to state B through three different paths 1 , 2, 3 . The work done is minimum in

asked Mar 20, 2014 by yamini.v

1 answer

S1: Absolute values of H and E cannot be determined.\[\] S2: Both H and E are state functions.

asked Mar 20, 2014 by thanvigandhi_1

1 answer

S1: For the process to be spontaneous, both $ \Delta G$ as well as $ \Delta S$ has to be less than zero.\[\] S2: For spontaneous change, $ \Delta S_{Total} > 0.$

asked Mar 20, 2014 by thanvigandhi_1

1 answer

In an isochoric process $\;dQ : du\;$ =

asked Mar 20, 2014 by yamini.v

1 answer

S1: No heat engine has efficiency of 100% \[\] S2: Complete conversion of heat in to work is not possible.

asked Mar 20, 2014 by thanvigandhi_1

1 answer

S1: Reversible process and cyclic process have same meaning. \[\] S2: $\Delta H_{cycle}$ and $\Delta E_{cycle}$ is zero.

asked Mar 20, 2014 by thanvigandhi_1

1 answer

Which among the following is/are endothermic reaction(s)? \[\] (1) Combustion of methane \[\] (2) Decomposition of water \[\] (3) Dehydrogenation of ethane to ethane \[\] (4) Conversion of graphite to diamond

asked Mar 20, 2014 by thanvigandhi_1

1 answer

Two moles of a perfect gas undergoes following processes: \[\] 1. A reversible isobaric expansion from (1 atm, 20L) to (1 atm, 40L)\[\] 2. A reversible isochoric change of state from (1 atm, 40L) to (0.5 atm, 40L)\[\] 3. A reversible isothermal compression from (0.5 atm, 40L) to (1atm, 20L)\[\] Calculate the total work done involved in the above processes

asked Mar 20, 2014 by thanvigandhi_1

1 answer

1-pentyne(A) is treated with $4N$ alcoholic $KOH$ at $175^{\circ}C$. It is converted slowly into an equilibrium mixture of $1.3 \% \: 1-$ pentyne, $95.2 \%\: 2$-pentyne(B) and $3.5 \%$ of $1,2-$ pentadiene(C). The equilibrium was maintained at $175^{\circ}C. $ \[\] Calculate $ \Delta G^{\circ}$ for the equilibrium \[\] $B \leftrightharpoons C$

asked Mar 20, 2014 by thanvigandhi_1

1 answer

1-pentyne(A) is treated with $4N$ alcoholic $ KOH$ at $175^{\circ}C$. It is converted slowly into an equilibrium mixture of $1.3 \% \: 1-$ pentyne, $95.2 \%\: 2- $ pentyne(B) and $3.5 \%$ of $1,2- $ pentadiene(C). The equilibrium was maintained at $175^{\circ}C$. \[\] Calculate $ \Delta G^{\circ}$ for the equilibrium \[\] $ B \leftrightharpoons A$

asked Mar 20, 2014 by thanvigandhi_1

1 answer

A sample of Ar gas at 1 atm pressure and $27^{\circ}C$ expands reversibly and adiabatically from $1.25\: dm^3\: to\: 2.5\: dm^3$. Calculate enthalpy change of this process. $CV$ for argon is $ 12.4\: kJ/mol$

asked Mar 20, 2014 by thanvigandhi_1

1 answer

A monatomic ideal gas at temperature $ T_1$ is enclosed in a cylinder with frictionless piston. The gas is allowed to expand adiabatically to a temperature $T_2$ by releasing piston suddenly. If $L_1$ and $L_2$ are lengths of gas columns before and after expansion, then

asked Mar 20, 2014 by thanvigandhi_1

1 answer

Find the value of logKP for the reaction \[\] $N_2(g) + 3H_2(g) \leftrightharpoons 2NH_3(g) $ \[\] The standard enthalpy of formation of $ NH_3 \: is \: -46\: kJ$. The standard entropies of $N_2(g),\: H_2(g)\: and\: NH_3(g) \: are\: 191, 130\: and\: 192\: J/Kmol$ respectively. $(R = 8.3 \: J/Kmol)$

asked Mar 20, 2014 by thanvigandhi_1

1 answer

From the given data, calculate the enthalpy of combustion of cyclopropane at $298 \: K$. The enthalpy of formation of $CO_2(g), H_2O(l)$ and propene(g) are $-393.5, -285.8$ and $20.42 \: kJ/mol$ respectively. The enthalpy of isomerisation of cyclopropane to propene is $-33 \: kJ/mol$

asked Mar 20, 2014 by thanvigandhi_1

1 answer

The value of $ \Delta E$ for reversible isothermal evaporation of $90g$ of water at $100^{\circ}C$. Assume that water vapor behaves as ideal gas and $ \Delta H_{vap}$ of water is $540\: cal/g(R = 2\: cal/molK)$

asked Mar 20, 2014 by thanvigandhi_1

1 answer

The change in internal energy of a gas $\;du=$

asked Mar 20, 2014 by yamini.v

1 answer

Some amount of heat given to a gas under isothermal conditions will result in

asked Mar 20, 2014 by yamini.v

1 answer

If $\;du_{1}\;,du_{2}\;,du_{3}\;$ are change in internal energy of gas in isobaric , isothermal and adiabatic processes , then for the same change in temperature

asked Mar 20, 2014 by yamini.v

1 answer

$PV=nRT\;$ is true for

asked Mar 20, 2014 by yamini.v

1 answer

$dQ=du\;$ and $\;dw=0\;$ is

asked Mar 20, 2014 by yamini.v

1 answer

Increase in internal energy of a gas corresponds to

asked Mar 20, 2014 by yamini.v

1 answer

Heat supplied to a gas at constant pressure is utilised to

asked Mar 20, 2014 by yamini.v

1 answer

The amount of heat required to raise the temperature of a gas would be minimum when it is heated through

asked Mar 20, 2014 by yamini.v

1 answer

Compute the heat of formation of liquid methanol in kilojoules per mole, using the given data: \[\] $ \Delta H_{vap}$ of liquid methanol $= -38\: kJ/mol, \Delta H_f^{\circ}\: of\: H(g), C(g), O(g)$ respectively are $218, 715\: and\: 247\: kJ/mol$. Also, $ \Delta H_{C-H}, \Delta H_{C-O}, \Delta H_{O-H}$ being $415, 356, 463 \: kJ/mol$ respectively.

asked Mar 19, 2014 by thanvigandhi_1

1 answer

Enthalpy change involved in the oxidation of glucose is $-2880\: kJ/mol$. Twenty five percent of this energy is available for muscular work. If $100\: kJ$ of muscular work is required to walk one kilometer, what is the maximum distance that a person will be able to walk after eating $120g$ of glucose.

asked Mar 19, 2014 by thanvigandhi_1

1 answer

At $300\: K$, the standard enthalpies of formation of $C_6H_5COOH(s), CO_2(g)\: and\: H_2O(l)\: are\: -408, -393\: and\: -286 \: kJ/mol$ respectively. Calculate the heat of combustion of benzoic acid at constant volume and at constant pressure. $(R=8.31\: J/Kmol)$

asked Mar 19, 2014 by thanvigandhi_1

1 answer

A gas expands from a volume of $3\: dm^3$ against a constant external pressure of $3\: atm$. to a volume of $5\: dm^3$. The work of expansion is used to heat $ 10\: ml$ of water at $290\: K$. Calculate the final temperature of the water.

asked Mar 19, 2014 by thanvigandhi_1

1 answer

Water gas is fuel made by passing steam over red hot coke as $ H_2O(g) + C(s) \rightarrow CO(g)+H_2(g)$ \[\] Given that $ \Delta H_f^{\circ} \: of\: H_2O(g), CO(g)\: are\: -241.8\: and \: -110.5\: kJ/mol$. Also, the values of $S^{\circ}$ for $H_2O(g), C(s), CO(g)\: and\: H_2(g)\: are\: 188.7, 197.9, 131\: and\: 5.69\: J/Kmol$ respectively. Assuming $ \Delta H^{\circ}\: and\: \Delta S^{\circ}$ to be temperature independent, the temperature at which the reaction becomes favorable is

asked Mar 19, 2014 by thanvigandhi_1

1 answer

If the values of $ \Delta H_f^{\circ}\: for\: CH_4(g), C_2H_6(g), CO_2(g)\: and \: H_2O(l)$ are respectively $-74.85, -84.68, -393.5 \: and\: -286\: kJ/mol,$ predict which is more efficient fuel?

asked Mar 19, 2014 by thanvigandhi_1

1 answer

Calculate the resonance energy of $N_2O$ from the following data: \[\]$ \Delta H_f^{\circ}$ of $N_2O = 82 \: kJ/mol$, Bond energies of $N≡N,\: N=N,\: O=O \: and\: N=O$ bonds are $946,\: 418,\: 498\: and\: 607\: kJ/mol$ respectively

asked Mar 19, 2014 by thanvigandhi_1

1 answer

Calculate $ \Delta H_{C-H}$ from the following data: $ \Delta H^{\circ}_{combustion}$ of ethane and propane are $-372$ and $-530\: kcal/mol$ respectively, $ \Delta H_f^{\circ}$ of $CO_2(g)$ and $H_2O(l)$ are $-94$ and $-68\: kcal/mol,\: \Delta H^{\circ}$ for $C(graphite) \rightarrow C(g)\: is\: 172\: kcal \: and\: \Delta H_{H-H} \: is\: 104 \: kcal.$

asked Mar 19, 2014 by thanvigandhi_1

1 answer

Estimate the value of $ \Delta S^{\circ}_{298}$ for the dissociation of calcium carbonate given that, $ \Delta H^{\circ}_{298}$ for the reaction is $178\: kJ$. The equilibrium pressure is one bar at $897^{\circ}C.(R = 8.314\: J/Kmol)$

asked Mar 19, 2014 by thanvigandhi_1

1 answer

Calculate the bond energy of $ C-H$ bond in methane from the following data: \[\] $C(s) + 2H_2(g) \rightarrow CH_4(g);\: \: \: \Delta H = -74.8\: kJ$ \[\] $ H_2(g)\rightarrow 2H(g);\Delta H = 435.4\: kJ$ \[\] $ C(s) \rightarrow C(g);\Delta H = 718.4 \: kJ$

asked Mar 19, 2014 by thanvigandhi_1

1 answer

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