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Answers posted by meena.p
Questions
12710
answers
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0
votes
Compound A reacts with sodium to liberate hydrogen forming a compound B. Wh
answered
Sep 28, 2018
Solution : https://clay6.com/mpaimg/5_aa1.jpg
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The reaction type that does not generally involved the transfer of electrons and is not viewed as a redox reaction .
answered
Sep 27, 2018
Solution : Acid base reactions do not involve the transfer of electrons . From the Bronsted Lowry pe...
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The reaction type that can be viewed as redox often involving hydrocarbon fules and oxygen releasing heat and light .
answered
Sep 27, 2018
Solution : Generally reactions in which elements and compounds react to form new elements and compou...
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The reaction type that can be viewed as redox often involving hydrocarbon fueld and oxygen releasing heat and light
answered
Sep 27, 2018
Solution : Hydrocarbon reactions can be seen as redox reaction due to the fact that an element $O_2$...
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What does each letter of the ideal gas law represent?
answered
Sep 26, 2018
Solution : The ideal gas law is used to identify values in a given state (for the values of pressure...
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If 1.0 mol of helium gas (He) at standard temperature and pressure (STP) has a volume of 22.4L, how many moles of carbon tetrachloride gas $(CCl_4)$ will be present in a container with a volume of 22.4L?
answered
Sep 26, 2018
Solution : Avogadro's Law states that two gases at the same temperature and volume will have an equa...
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If the temperature of a gas increases, what happens to the pressure?
answered
Sep 26, 2018
Solution : According to Gay-Lussac's law, the attributes of pressure and temperature vary by direct ...
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In which condition can real gas obey closely the ideal gas equation?
answered
Sep 26, 2018
Solution : (a) pressure is very small and temperature is very high
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The perfect example of an ideal gas is
answered
Sep 26, 2018
Solution : (d) none of the above
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A gas mixture has $30\% O_2, 40\% H_2,$ and $30\% N_2$ with molar volume of $N_2\; 10 L/mole$ at temperature $27^{\circ}C$, what is the partial pressure of $H_2$?
answered
Sep 26, 2018
Solution : Molar volume of $H_2$ = molar volume of $N_2 = 10 L/mole$$ PV = nRT$$ => P \times 10 =...
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The fraction of gas in a container is 0.5, if the total volume of the container is 6 liter, what is the volume of the gas?
answered
Sep 26, 2018
Solution : Volume of gas = Volume of container = 6 liter.
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A gas in a 30.0mL container is at 1.05atm is compressed to a volume of 15.0mL. What is the new pressure of the container? Possi
answered
Sep 25, 2018
Solution : Boyle's Law is:$P_1V_1=P_2V_2$The initial volume $(V_1)$ and pressure $(P_1)$ of the gas ...
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Which of the following is not the unit of R?
answered
Sep 25, 2018
Solution : N.Kg.m/K.mole is the unit of R.
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What is the molecular mass of an ideal gas with pressure 1 atm, and density 10 g/L at temperature $27^{\circ}C$?
answered
Sep 25, 2018
Solution : $M = \large\frac{dRT}{P}$$\qquad = 10 \times 0.0821 \times 300/1 = 246.3 g.$
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First of the two ideal gases has twice molar volume as much as the second at same temperature, what is the ratio of their pressures?
answered
Sep 25, 2018
Solution : $P_1V_1 = n_1RT_1, P_2V_2 = n_2RT_2 $ dividing both the equations, => $P_1V_2 = 1:2.$
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What is the Temperature of a 2 liter/mole ideal gas with pressure 10 atm?
answered
Sep 25, 2018
Solution : $ PV = nRT,$$ 10 \times 2 = 0.0821 \times T,$$ => T = 243.6\; K.$
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Which of the following is not true about ideal gas molecules?
answered
Sep 25, 2018
Solution : Ideal gas molecules apply pressure to the walls of container.
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What is the shape of a P-T curve for ideal gas?
answered
Sep 25, 2018
Solution : P-T curve is straight line for ideal gas.
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Which of the following term does not involve in ideal gas law?
answered
Sep 25, 2018
Solution : Ideal gas law is PV = nRT, which does not involve time.
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A balloon of volume .666L at 1.03atm is placed in a pressure chamber where the pressure becomes 5.68atm, determine the new volume.
answered
Sep 25, 2018
Solution : Use Boyle's law and plug in appropriate parameters:$P_1V_1=P_2V_2$$.666L \times 1.03\;atm...
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What will be the final pressure if the volume of the container changes to 2L?
answered
Sep 25, 2018
Solution : Since the volume of the gas is the only variable that has changed, we can use Boyle's law...
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The graph depicted below represents which of the gas laws?
answered
Sep 24, 2018
Solution : The graph shows that there is a directly proportional relationship between the volume of ...
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Assume air contains 21% oxygen and 79% nitrogen. If air is compressed to 5.5atm, what is the partial pressure of the oxygen?
answered
Sep 24, 2018
Solution : Use Dalton's law of partial pressure:$PO_2=P_{total} \times yO_2$Where $PO_2$ is the part...
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As the temperature is raised from $20^{\circ}$ to $40^{\circ}C$ , the average kinetic energy of neon atoms charges by a factor of which of the following ?
answered
Sep 24, 2018
Solution:Kinetic energy is directed proportional to absolute temperature$\large\frac{E_1}{E_2}=\frac...
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Which is not true in case of an ideal gas ?
answered
Sep 24, 2018
Solution :Gas molecules at same with different speed.
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When 200 milliliters of a gas at constant pressure is heated, its volume
answered
Sep 24, 2018
Solution : (A) When confined gases at a constant pressure are heated, they expand.
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Which law is the following formula? $V_1T_1=V_2T_2$
answered
Sep 24, 2018
Solution : Charles's law defines the direct relationship between temperature and volume. When the pa...
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votes
Assume air contains 21% oxygen and 79% nitrogen. If air is compressed to 5.5atm, what is the partial pressure of the oxygen?
answered
Sep 24, 2018
Solution : Use Dalton's law of partial pressure:$PO_2=P_{total} \times yO_2$Where $PO_2$ is the part...
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Which of the following gas laws can be used to determine the total pressure of a mixture of gases?
answered
Sep 24, 2018
Solution : Each gas in a mixture of gases exerts its own pressure independently of the other gases p...
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votes
Which of the following is a physical property of gases?
answered
Sep 24, 2018
Solution : There are six primary properties of gases: expansion, fluidity, low density, compressibil...
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A container filled with fluorine gas and neon gas and has a total pressure of 8atm. There are 50g of fluorine gas in the container, and the fluorine gas exerts a pressure of 5atm.Based on this, what is the mass of neon in the container?
answered
Sep 24, 2018
Solution : The partial pressures of each gas are not dependent on their masses, but the total number...
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Which of the following is not a characteristic of gases?
answered
Sep 24, 2018
Solution : Gases are able to effuse though small pinhole openings, and diffuse into empty spaces fro...
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Which of the following gases will diffuse the quickest through a small hole?
answered
Sep 24, 2018
Solution : Gases with high higher molecular weights are going to move at slower velocities.At a give...
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The electronic configuration of a metal ion in its complex is [Ar]3d4.For t
answered
Sep 18, 2018
please check your reference : We are given that the electronic configuration of the element in +3 ox...
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votes
2 moles of n2o4 is kept in a closed container at 298k and 1atm pressure.it
answered
Sep 18, 2018
Solution : https://clay6.com/mpaimg/aau1.jpgAccording to the ideal gas equation , at two condition ,...
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votes
Draw a table indicating various dispersed phase and the dispersing medium a
answered
Sep 18, 2018
Solution : https://clay6.com/mpaimg/aau.jpg
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votes
Ratio of last line of balmer and Lyman aeries
answered
Sep 18, 2018
Solution : For the last Balmer series $\large\frac{1}{\lambda_b}=R\bigg[\large\frac{1}{2^2}-\frac{1}...
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votes
A gaseous mixture was prepared by taking equal mole of Co2 and n2 .if the t
answered
Sep 18, 2018
Solution : $\therefore ^nCO=^nN_2$$P_{co}=P_{N_{2}}$Given $P_{co}+P_{N_{2}}=1 atm$or $2 P_{N_{2}}=1 ...
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votes
At what temp at which the rms velocity of so2 molecules is same as that of
answered
Sep 18, 2018
Solution : $V_{rms}=(3RT/M)^{1/2}$Where M= molar mass of the molecule For $O_2$$V_{rms}=(3 \times 8....
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votes
Calculate enthalpy change when $2.38\;g$ of carbon monoxide vapourises at its normal boiling point. $\Delta H_{vap}$ of $CO=6.04\;kj\;mol^{-1}$
answered
Sep 17, 2018
Solution : $\Delta H_{vap} $ of $CO=+6.04 \;kJ mol^{-1} $Molar mass of $CO =28\;g\;mol^{-1}$ Energy ...
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votes
Most metals react with acids to form
answered
Sep 17, 2018
Solution : Hydrogen gas is formed as the metal reacts with the acid to form a salt. Many, but not al...
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votes
A system does 200 J of work and at the same time absorbs 150 J of heat. What is the internal energy change ?
answered
Sep 17, 2018
Solution : Here, $W= -200\;J$$q= +150\;J$according to first law of thermodynamics $\Delta U= q+w=+15...
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votes
The equilibrium constant for the reaction is 10. Calculate the value of $\Delta G^{-}$ given
answered
Sep 17, 2018
Solution : $\Delta G^{-}=-2.303\;RT\;log K$Here $R=8.0\;JK^{-1}$$T= 300 K$$K= 10$$\Delta G =-2.303 \...
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votes
Enthalpy of combustion of carbon to carbon dioxide is $-393.5\;kJ\;mol^{-1}$. calculate the heat released upon formation of $35.2\;g$ of $CO_2$ from carbon to oxygen gas.
answered
Sep 17, 2018
Solution : The combusion equation is $C(s)+)0_2(g) \to CO_2(g): \Delta _c H=-393.5\;kJ mol^{-1}$Heat...
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A reaction ,$A+B \to C+D+q$ is found to have an positive entropy change. The reaction will be
answered
Sep 17, 2018
Solution : The correction answer is (d) Since the reaction is exothermic $(\Delta H < 0)$ and has...
0
votes
The enthalpies of all elements in their standard states are :
answered
Sep 17, 2018
Solution : zero
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In a process , 701 J of heat is absorbed by a system and $394\;J$ of work is done by the system . What is the change in internal energy for the process ?
answered
Sep 17, 2018
Solution : Heat absorbed by the system (q) =+701 JWork done by the system (w) =-304 JChange in inter...
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How much heat is required to raise the temperature of an aluminium vessel weighting 1.25 kg from $25^{\circ}C$ to $55^{\circ}$ ? Molar heat capacity of Al is $24\;J\;mol^{-1}K^{-1}$
answered
Sep 14, 2018
Solution : $q=c \times \Delta T$Here $C_m= 24.07 \;mol^{-1}K^{-1}$$n= \large\frac{1.5 \times 10^3}{2...
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The average measure of two angles of a triangle is $80^{\circ}$. What is the measure of the third angle ?
answered
Sep 14, 2018
Solution : $\angle A+\angle B+\angle C=180^{\circ}$$\large\frac{\angle A + \angle B}{2}$$=80^{\circ}...
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If the hypotenuse of a triangle is 5 meters, which of the following is the closest value to the area of the triangle ?
answered
Sep 14, 2018
Solution : The area of the triangle cannot be smaller than its hypothesis length or bigger that its ...
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