52671 + Interview Questions in Chemistry in Class 11

1.	Atomic hydrogen combines with almost all elements but molecular hydrogen does not. Explain.
Answer» Solution :Atomic hydrogen is highly unstable and hence it is very reactive. Its electronic configuration is `1s^1`. For stability it ACCEPT 1 more electron and thus it almost COMBINE with all the elements. Atomic hydrogen make hydride by THREE different type. (i) If remove one electron and FORM `H^+` (ii) It accept one electron and form `H^-` (iii) It share one electron and form covalent single bond. In contrast, the bond dissocia tion energy of H-H bond is very high (435.88 kJ `"mol"^(-1)`). As a result molecular hy drogen is almost inert at room TEMP. and hence reacts only with a few elements.

Discussion

2.	Atomic and molecular sizes are typically of the order of a few Angstroms. Assuming that a N_2 molecules is spherical in shape with radius (r) = 2 xx 10^(-10) m, calculate the volume of a single N_2 molecule,
Answer» SOLUTION :`3.35 XX 10^(-23) cm^3`

Discussion

3.	Atomic and molecular sizes are typically of the order of a few Angstroms. Assuming that a N_2 molecules is spherical in shape with radius (r) = 2 xx 10^(-10) m, calculate the percentage of empty space in one mole of N_2 gas at S.T.P.
Answer» SOLUTION :`99.9098%`

Discussion

4.	Atomic and mass numbers can be
Answer» Negative FRACTIONAL Zero WHOLE number Answer :D

Discussion

5.	Atmospheric pressures recorded in different cities are as follows : {:("Cities","p in N"//m^(2)),("Shimla",1.01xx10^(5)),("Bangalore",1.2xx10^(5)),("Delhi",1.02xx10^(5)),("Mumbai",1.21xx10^(5)):} Consider the above data and mark the place at which liquid will will boil first.
Answer» Shimla Bangalore Delhi Mumbai Solution :A LIQUID boils when VAPOUR pressure above it becomes EQUAL to the atmospheric pressure. LOWER the atmospheric pressure, lower is the boiling point.

Discussion

6.	Atmospheric content of CO_(2) is
Answer» `0.0034%` `0.034%` `0.34%` `3.4%` SOLUTION :ATMOSPHERIC CONTENT of `CO_(2)` is 0.034% by VOLUME

Discussion

7.	Atmosphere pollutant is
Answer» `CO_(2)` CO `O_(2)` `N_(2)` SOLUTION :CO is an atmospheric POLLUTANT

Discussion

8.	Atmosphere, hydrosphere, lithosphere and biosphere are the four main segments of the environment. Atmosphere is a cover of gases that extends to a height of about 1600 km above the surface of the earth and protects the life on the earth from harmful radiations coming from the sun or the outer space. Atmosphere is further divided into four regions such as troposphere, stratosphere, mesosphere and thermosphere. Hydrosphere forms that part of the environment which contains water. Lithosphere is the solid component of the earth consisting of soil, rocks, mountains etc. Biosphere is that part of the above segments where living organisms interact with these parts and live together. The biotic component of the environmentis
Answer» Lithosphere BIOSPHERE HYDROSPHERE Atmosphere ANSWER :B

Discussion

9.	Atmosphere, hydrosphere, lithosphere and biosphere are the four main segments of the environment. Atmosphere is a cover of gases that extends to a height of about 1600 km above the surface of the earth and protects the life on the earth from harmful radiations coming from the sun or the outer space. Atmosphere is further divided into four regions such as troposphere, stratosphere, mesosphere and thermosphere. Hydrosphere forms that part of the environment which contains water. Lithosphere is the solid component of the earth consisting of soil, rocks, mountains etc. Biosphere is that part of the above segments where living organisms interact with these parts and live together. Hydrogen and Helium are found in which of the following regions ?
Answer» MESOSPHERE Exosphere TROPOSPHERE Stratosphere ANSWER :B

Discussion

10.	Atmosphere, hydrosphere, lithosphere and biosphere are the four main segments of the environment. Atmosphere is a cover of gases that extends to a height of about 1600 km above the surface of the earth and protects the life on the earth from harmful radiations coming from the sun or the outer space. Atmosphere is further divided into four regions such as troposphere, stratosphere, mesosphere and thermosphere. Hydrosphere forms that part of the environment which contains water. Lithosphere is the solid component of the earth consisting of soil, rocks, mountains etc. Biosphere is that part of the above segments where living organisms interact with these parts and live together. Which of the following is the coldest region ?
Answer» MESOSPHERE Tropospere STRATOSPHERE Thermospehere ANSWER :A

Discussion

11.	Atmosphere content of CO_2 is
Answer» `0.0034%` `0.034%` `0.34%` `3.4%` ANSWER :B

Discussion

12.	Atmolysis is the method used to separate a mixture of
Answer» two liquids which differ in their boiling points by at LEAST `40^(@) C` two gases which differ in their rates of DIFFUSION under similar CONDITIONS of T and P two gases which have same rates of diffusion under similar conditions of T and P two gaseswhich react to FORM a solid Answer :B

Discussion

13.	Atmolysis is a process of
Answer» Atomising GAS molecules The breaking of ATOMS to sub-atomic particles Separation of gases from their gaseous MIXTURE Changing of liquids of their vapour state Solution :ATMOLYSIS is the process of separtion of mixture of unreacting gases by the process of diffusion

Discussion

14.	The volume of an ideal gas becomes zero at
Answer» `0^(@)C` `273 K` `-273^(@)C` `273^(@)C` ANSWER :C

Discussion

15.	At which temperature kelvin and ""^(@)C are same ?
Answer» 273 -40 -273 Not possible Answer :B::D

Discussion

16.	At which situation intermolecular forces becomes effective ?
Answer» SOLUTION :At high pressure : Attraction forces becomes EFFECTIVE between molecules then CHANGE in pressure is `(an^(2))/(V^(2))`. `p_("ideal")=p_("real")+(an^(2))/(V^(2))` At high pressure : Repulsive forces becomes effective between molecules then change in volume in nb. `V_("ideal")=(V_("real")-nb)` At very LOW temperature : Intermolecular forces become significant. As the molecules travel with low average speed, these can be captured by one another due to attractive forces.

Discussion

17.	At which position nitration mainly takes place ?
Answer» ANSWER :C

Discussion

18.	At which distance observed for van der Waal.s force ?
Answer» `8 Å` `5 Å` `4.5 Å` Not decided Answer :C

Discussion

19.	At which condition density becomes maximum ?
Answer» p = 0.5 atm and T = 600 K p = 2 atm and T = 150 K p = 1 atm and T = 500 K p = 1.5 atm and T = 400 K ANSWER :B

Discussion

20.	At what temperature will the total kinetic energy of 0.5 moles of He be the same as the total kinetic energy of 0.6 moles of neon at 300K?
Answer» 300 K 360 K 400 K 250 K Solution :360 K

Discussion

21.	At what temperature will the total kinetic energy of 0.30 mol of He be same as the total kinectic energy of 0.40 mol of Ar at 400 K ?
Answer» 400 K 300 K 533 K 573 K Solution :`K.E.=(3)/(2)NRT` `:. (3)/(2)xx.04xx400=(3)/(2)xx0.3xxT" or "T=533" K"`

Discussion

22.	At what temperature will the total KE of 0.3 mo of He be the same as the total KE of 0.40 mol of Ar at 400K?
Answer» 533K 400K 346K 300K Answer :a

Discussion

23.	At what temperature will the rate of diffusion of N_(2)be 1.6 times the rate of diffusion of SO_(2)at 27°C?
Answer» `336^@ C` `300 K` `50 ^@ K` `63^@ C` ANSWER :D

Discussion

24.	At what temperature, will most probable speed of the molecules of the second member of homologous series C_(n),H_(2n-2) be the same as that of oxygen at 527^(@)C?
Answer» `1000^(@)C` `727^(@)C` `1727^(@)C` `1044.5^(@)C` ANSWER :B

Discussion

25.	At what temperature will hydrogen molecules have the same kinetic energy an nitrogen molecules have at 35^(@)C?
Answer» `((28xx35)/(2)).^(@)C` `((2xx35)/(28)).^(@)C` `((2xx28)/(35)).^(@)C` `35^(@)C` ANSWER :d

Discussion

26.	At what temperature water has maximum density ?
Answer» ANSWER :`4^(@)C`

Discussion

27.	At what temperature volume of gas becomes half, initial temperature and volume is 17^(@)C and 400 mL respectively. (Charle.s law)
Answer» ANSWER :`-128^(@)C`

Discussion

28.	At what temperature, the volume of a gas would become zero ?
Answer» `0^(@)C` `273^(@)C` `-273.15^(@)C` 273 K Solution :It becomes ZERO at absolute zero i.e, `-273.15^(2)C`

Discussion

29.	At what temperature, the volume of 'V' of a certain mass of gas at 37^@C will be doubled, keeping the pressure constant?
Answer» `327^@ C` `347^@ C ` `527^@ C` `54^@ C` Answer :B

Discussion

30.	At whattemperature the volume of 28 grams of N_2 will be 1L exerting a pressure of1 atm?
Answer» SOLUTION :28g of `N_2` at 273K, 1 ATM pressure occupies 22.4L Charles. law is given as,` (V_1)/(V_2) = (T_1)/(T_2)` `V_1= 22.4L"" T_1= 273K` ` V_2= 1.0L"" T_2 =?` The temperature at which 1L of 28g of N, exerts a pressure of 1 atm =` T_2= (V_2T_1)/(V_1) = ( 1 XX 273 )/( 22.4) = 12.2 K=- 260.8^@ C `

Discussion

31.	At what temperature, the rms velocity of SO_(2) be same as that of O_(2) at 303K ?
Answer» 273 K 606 K 303 K 403 K Solution :(b) `(U_(rms)(SO_(2)))/(U_(rms)(O_(2)))=SQRT((T(SO_(2)))/(M(SO_(2)))XX(M(O_(2)))/(T(O_(2))))` i.e. `1=sqrt((T(SO_(2)))/(64)xx(32)/(303))or T(SO_(2))=606 K`

Discussion

32.	At what temperature the velocity of O_(2) molecules will have the same velocity as SO_(2)at 47°C?
Answer» `113^@ C ` `160^@ C` `-113 ^@ C ` `-160^@ C` ANSWER :C

Discussion

33.	At what temperature the most probable velocity of O_(2) gas is equal to the RMS velocity of O_(3)at 't'°C?
Answer» `(273 +t) sqrt(3/2 K)` `(273 + t)sqrt(2/3 K)` `(273 + t) K` `3/2 (273 + t ) K` SOLUTION :`(U_(MP))_(O_2) = (U_(rms))_(O_3)` `= sqrt((2RT_2)/(32)) = sqrt((3R(t + 273))/(48))` `(2T_2)/(32) = (3(t+273))/(48) implies t_2 = (t + 273)k`.

Discussion

34.	At what temperature the most probable velocity of O_2 gas is equal to the RMS velocity of O_2 at ‘t’^@C?
Answer» `(273 + t)sqry(3/2K)` `(273 + t)sqry(2/3K)` `(273 + t)K` `3/2(273 + t)K` ANSWER :C

Discussion

35.	AT what temperature root mean square speed of N_(2) gas is equal to that of propane gas at STP condition?
Answer» `173.7^(@)C` 173.7K STP `-40^(@)C` ANSWER :B

Discussion

36.	At what temperature, reduction of lead oxide to lead by carbon i.e., PbO(s) +C(s) rarr Pb(s) + CO(s) becomes spontaneous. For the reaction , Delta Hand Delta S are 108.4 kJ mol^(-1) and 190.0 JK^(-1) mol^(-1) respectively.
Answer» Solution :At equilibrium, `T = (DeltaH)/(DeltaS) = (108400 J MOL^(-1))/( 190 JK^(-1) mol^(_1)) = 570 . 5K` Above 570.5 K, `Delta G` will be `-ve` and the reaction will be spontaneous.

Discussion

37.	At what temperature the kinetic energy of a gas molecule is one-half of its value at 30^@C?
Answer» Solution :`(K.E.) =3/2 KT` At TWO different conditions ` ((KE)_1)/((KE)_2) = (T_1) /(T_2) , (1)/( 1//2)= ( 303)/(T_2)` Temperature at which KINETIC energy is half =`(303)/(2)` ` = 151.5 K =- 121.5^@ C `

Discussion

38.	At what temperature hydrogen has the same RMSvelocity as that of oxygen at room temperature?
Answer» Solution :RMS VELOCITY (C ) is given as ` C = sqrt((3RT)/(M))` For TWO gases, RMS velocity is same. `(T_(1))/(M_(1)) = (T_(2))/(M_(2))` `T_(1) =` TEMPERATURE of OXYGEN= 298 K `T_(2)` = Temperature of hydrogen = ? Temperature of hydrogen gas ` = T_(2) = (T_(1))/(M_(1)) xx M_(2)` ` = (298 xx 2)/(32) = 18.6K = -254.4^(@)C`

Discussion

39.	At what temperature does the reaction below change from favoring products to favoring
Answer» 162K 509K 1060K 1540K Answer :C

Discussion

40.	At what temperature centigrade will the volume of a gas at 0^(@)C double itself, pressure remaining constant ?
Answer» Solution :LET the volume of the gas at `0^(@)C`=V mL THUS, we have : `V_(1)=V mL,V_(2)=2V mL` `T_(1)=0+273=273 K""T_(2)=?` By applying, Charles' Law,`(V_(1))/(T_(1))=(V_(2))/(T_(2))` Substituting the corresponding values, we have `(V)/(273)=(2V)/(T_(2)),"" T_(2)=(2Vxx273)/(V)=546 K :. T_(2)=546-273=273^(@)C`

Discussion

41.	At what temperature ""^(@)C=""^(@)F
Answer» `-30^(@)` `-40^(@)` `-20^(@)` Not possible Solution :`""^(@)F= 9/5 (""^(@)C)+32 "" F=C` `""^(@)C=9/5 (""^(@)C)+32` `5""^(@)C=9""^(@)C+32xx5` ` - 4""^(@)C=32xx5` `""^(@)C= - 40`

Discussion

42.	At what temperature and pressure the liquid is vapourise in vapour phase distillation?
Answer» SOLUTION :At 373K and 1 ATM PRESSURE

Discussion

43.	At what proportion of carboxy-hemoglobin the oxygen carrying capacity of blood reduces ?
Answer» 4 to 5% 3 to 4% 4 to 6% 3 to 5% SOLUTION :3 to 4 %

Discussion

44.	At what pH will a 10−4M solution of an indicator with Kb=1×10−11change colour?
Answer» Solution :INDICATOR changes COLOUR when `PH =pKI_n , pH = 14 -11 =3`

Discussion

45.	At what molar concentration of aqueous nitrouse acid (K_a = 4.5x10^(-4)) the pH of the aqueous solution is 2.
Answer» SOLUTION :`0.222M`

Discussion

46.	At what distance is the radial probability maximum for 1s orbital ? What is this distance called ?
Answer» SOLUTION :`0.529 F279Å`, BOHR RADIUS

Discussion

47.	At what concentration of Zn^(2+) (aq) will its electrode potential become equal ot its standard electrode potential ?
Answer» SOLUTION :At 1 M CONCENTRATION

Discussion

48.	The ratio of kinetic energies of 2gm of H_2 and 4gm of CH_4 at a given temperature is
Answer» `1:4` `4:1` `2:1` `8:1` ANSWER :B

Discussion

49.	At the time of experiment how the solution with required concentration is prepared?
Answer» By adding the raw SALT By adding the stock SOLUTION By diluting the stock solution By concentrate the stock solution Answer :C

Discussion

50.	At the suggestion of Earnest Rutherford, hans Geiger and ernest Marsden bombarded a thin gold foil by alpha-particles from a polonium source. It was expected that alpha-particles would go right through the foil with hardly any deflection. Although, most of the alpha particles indeed were not deviated by much, a few were scattered through veryi large angles. Some were even scattered in the backward direction. The nly way to explain the results, rutherford found, was to picture an atom as being compoed of a tiny nucleus in which its positive charge and nearly all its mass are concentrated. Scattering of alpha-particles is proportional to target thickness and is inversely proportional to the fourth power of sin((theta)/(2)), where, theta is scattering angle. Distance of closest approach may be calculated as: r_("min")=(Z_(1)Z_(2)e^(2))/(4piepsi_(0)K) where, K=kinetic energy of alpha-particles. Q. Which of the following quantities will be zero for alpha particles at the point of closest approach to the gold atom, in Rutherford's scattering of alpha particles?
Answer» Acceleration Kinetic energy Potential energy Electrical energy Answer :B

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Atomic hydrogen combines with almost all elements but molecular hydrogen does not. Explain.

Atomic and molecular sizes are typically of the order of a few Angstroms. Assuming that a N_2 molecules is spherical in shape with radius (r) = 2 xx 10^(-10) m, calculate the volume of a single N_2 molecule,

Atomic and molecular sizes are typically of the order of a few Angstroms. Assuming that a N_2 molecules is spherical in shape with radius (r) = 2 xx 10^(-10) m, calculate the percentage of empty space in one mole of N_2 gas at S.T.P.

Atomic and mass numbers can be

Atmospheric pressures recorded in different cities are as follows : {:("Cities","p in N"//m^(2)),("Shimla",1.01xx10^(5)),("Bangalore",1.2xx10^(5)),("Delhi",1.02xx10^(5)),("Mumbai",1.21xx10^(5)):} Consider the above data and mark the place at which liquid will will boil first.

Atmospheric content of CO_(2) is

Atmosphere pollutant is

Atmosphere content of CO_2 is

Atmolysis is the method used to separate a mixture of

Atmolysis is a process of

The volume of an ideal gas becomes zero at

At which temperature kelvin and ""^(@)C are same ?

At which situation intermolecular forces becomes effective ?

At which position nitration mainly takes place ?

At which distance observed for van der Waal.s force ?

At which condition density becomes maximum ?

At what temperature will the total kinetic energy of 0.5 moles of He be the same as the total kinetic energy of 0.6 moles of neon at 300K?

At what temperature will the total kinetic energy of 0.30 mol of He be same as the total kinectic energy of 0.40 mol of Ar at 400 K ?

At what temperature will the total KE of 0.3 mo of He be the same as the total KE of 0.40 mol of Ar at 400K?

At what temperature will the rate of diffusion of N_(2)be 1.6 times the rate of diffusion of SO_(2)at 27°C?

At what temperature, will most probable speed of the molecules of the second member of homologous series C_(n),H_(2n-2) be the same as that of oxygen at 527^(@)C?

At what temperature will hydrogen molecules have the same kinetic energy an nitrogen molecules have at 35^(@)C?

At what temperature water has maximum density ?

At what temperature volume of gas becomes half, initial temperature and volume is 17^(@)C and 400 mL respectively. (Charle.s law)

At what temperature, the volume of a gas would become zero ?

At what temperature, the volume of 'V' of a certain mass of gas at 37^@C will be doubled, keeping the pressure constant?

At whattemperature the volume of 28 grams of N_2 will be 1L exerting a pressure of1 atm?

At what temperature, the rms velocity of SO_(2) be same as that of O_(2) at 303K ?

At what temperature the velocity of O_(2) molecules will have the same velocity as SO_(2)at 47°C?

At what temperature the most probable velocity of O_(2) gas is equal to the RMS velocity of O_(3)at 't'°C?

At what temperature the most probable velocity of O_2 gas is equal to the RMS velocity of O_2 at ‘t’^@C?

AT what temperature root mean square speed of N_(2) gas is equal to that of propane gas at STP condition?

At what temperature, reduction of lead oxide to lead by carbon i.e., PbO(s) +C(s) rarr Pb(s) + CO(s) becomes spontaneous. For the reaction , Delta Hand Delta S are 108.4 kJ mol^(-1) and 190.0 JK^(-1) mol^(-1) respectively.

At what temperature the kinetic energy of a gas molecule is one-half of its value at 30^@C?

At what temperature hydrogen has the same RMSvelocity as that of oxygen at room temperature?

At what temperature does the reaction below change from favoring products to favoring

At what temperature centigrade will the volume of a gas at 0^(@)C double itself, pressure remaining constant ?

At what temperature ""^(@)C=""^(@)F

At what temperature and pressure the liquid is vapourise in vapour phase distillation?

At what proportion of carboxy-hemoglobin the oxygen carrying capacity of blood reduces ?

At what pH will a 10−4M solution of an indicator with Kb​=1×10−11change colour?

At what molar concentration of aqueous nitrouse acid (K_a = 4.5x10^(-4)) the pH of the aqueous solution is 2.

At what distance is the radial probability maximum for 1s orbital ? What is this distance called ?

At what concentration of Zn^(2+) (aq) will its electrode potential become equal ot its standard electrode potential ?

The ratio of kinetic energies of 2gm of H_2 and 4gm of CH_4 at a given temperature is

At the time of experiment how the solution with required concentration is prepared?

At what pH will a 10−4M solution of an indicator with Kb=1×10−11change colour?