52671 + Interview Questions in Chemistry in Class 11

1.	The gas produced by the passage of air over hot coke is
Answer» Carbon MONOXIDE Carbon DIOXIDE PRODUCER gas Water gas Answer :C

Discussion

2.	The gas phase reaction shown is endothermic as written. Which, change(s) will increase the quantity of CH_(3)CH=CH_(2) at equilibrium? (P) Increasing the temperature (Q) Increasing the pressure H_(3)C-CH=CH_(2)hArr
Answer» <P>P only Q only Both P and Q Neither P nor Q Answer :D

Discussion

3.	The gas molecules randomly move in all directions and collide with each other and with the wall of the container. If is difficult to determine the speed of an individual molecule but it had become passible to work out the distribution of molecules among different molecular speeds. This is known as Maxwell Boltzmann distribution consider the following graph about Maxwell's distribution of speed at two different temperature T_(1) " and " T_(2) The curve has which of the following characteristics ? (i) It has symmetrical distribution of molecules against molecular velocity (ii) The area under the curve gives the total number of molecules. (iii) The maxima of teh curve shifts towards right as the temperature is raised. (iv) The area under the curve is independent of temperature Select the correct statements from the codes given below:
Answer» (i), (II) (i), (ii) and (III) (ii), (iii) and (IV) all are correct Answer :C

Discussion

4.	The gas molecules randomly move in all directions and collide with each other and with the wall of the container. If is difficult to determine the speed of an individual molecule but it had become passible to work out the distribution of molecules among different molecular speeds. This is known as Maxwell Boltzmann distribution consider the following graph about Maxwell's distribution of speed at two different temperature T_(1) " and " T_(2) Select the correct statement (s):
Answer» Most PROBABLE speed increases with increase in temperature Fraction of total molecules with most probable VELOCITY decreases with increase in temperature Area under the CURVE increases with increase in the temperature none of the above Answer :A::B

Discussion

5.	The gas molecules randomly move in all directions and collide with each other and with the wall of the container. If is difficult to determine the speed of an individual molecule but it had become passible to work out the distribution of molecules among different molecular speeds. This is known as Maxwell Boltzmann distribution consider the following graph about Maxwell's distribution of speed at two different temperature T_(1) " and " T_(2) Total area under the curve at T_(1) is :
Answer» EQUAL to that under CURVE at `T_(2)` less than that under curve at `T_(2)` GREATER than that under curve at `T_(2)` can be greater or less than that under curve at `T_(2)`, depending on the nature of the gas Answer :A

Discussion

6.	The gas molecules randomly move in all directions and collide with each other and with the wall of the container. If is difficult to determine the speed of an individual molecule but it had become passible to work out the distribution of molecules among different molecular speeds. This is known as Maxwell Boltzmann distribution consider the following graph about Maxwell's distribution of speed at two different temperature T_(1) " and " T_(2) The shaded area represents :
Answer» NUMBER of molecules having speed between `u_(1) " and " u_(2)` number of molecules having speed LESS than the most probable speed number of molecules having `v_(rms) " at " T_(1)` FRACTION of molecules having average speed Answer :A

Discussion

7.	The gas liberated when aluminium reacts with conc. H_2 SO_4 is
Answer» `H_(2)S` `O_2` `SO_2` `H_2` Solution :`2Al+6H_(2) SO_(4) rarr Al_(2) (SO_4)_(3)+3SO_(2)+6H_(2)O`

Discussion

8.	The gas liberated when aluminium reacts with conc. H_(2)SO_(4) is
Answer» `H_(2)S` `O_(2)` `SO_(2)` `H_(2)` SOLUTION :`2Al+6H_(2)SO_(4)RARR Al_(2)(SO_(4))_(3)+3SO_(2)+6H_(2)O`

Discussion

9.	The gas liberated by the electrolysis of Dipotassium succinate solution is :
Answer» Ethane Ethyne Ethene Propene Answer :C

Discussion

10.	The gas leaked from a storage tank of the Union Carbide plant in Bhopal gas tragedy was:
Answer» Phosgene Methylisocyanate Methylamine Ammonia Answer :B

Discussion

11.	The gas leaked from a storage tank of the union Carbide plant in Bhopal gas tragedy was
Answer» AMMONIA PHOSGENE METHYLISOCYANATE Methylamine Answer :C

Discussion

12.	The gas emitted by supersonic jet planes that slowly depletes the ozone layer is
Answer» CO NO `SO_2` `O_2` ANSWER :B

Discussion

13.	The gas emitted by supersonic jet planes that slowly depletee the ozone layer is
Answer» CO Nondegradable POLLUTANT `SO_(2)` `O_(2)` ANSWER :B

Discussion

14.	The gas constant R represents work done
Answer» PER MOLECULE per DEGREE absolute per degree per MOLE per mole Answer :C

Discussion

15.	The g/L of 5 M aqueous solution of NaOH is ....... (Molecular mass of NaOH : 40 g " mole"^(-1) )
Answer» 200 8 12.5 1.25 Answer :A::B

Discussion

16.	The functional group(s) present in H_(3)C-CH_(2)-O-CH_(2)-overset(O)overset("\|\|")("C")-OCH_(3)
Answer» ETHER, KETONE Ketone ESTER, Ether Ether, Ether Solution :Ester and Ether are the FUNCTIONAL GROUPS (COOR) (R-O-R).

Discussion

17.	The functional groups in cortisone are:
Answer» ETHER, ALKENE, alcohol Alcohol, ketone, alkene, ether Alcohol, ketone, AMINE Ether, amine, ketone Answer :B

Discussion

18.	The function of sodium pump is a biological process operating in each and every cell of all animals . Which of the following biologically important ions is also a constituent of the pump ?
Answer» `K^(+)` `Fe^(2+)` `Ca^(2+)` `MG^(2+)` ANSWER :A

Discussion

19.	The function of ZnCl_(2) in Lucas test for alcohols is
Answer» to act as acid catalyst and react with `HCL` to form `H_(2)ZnCl_(2)` to act as BASE catalyst and react with NaOH to form `Na_(2)ZN(OH)_(4)` to act as an AMPHOTERIC catalyst to act as an NEUTRAL catalyst Answer :D

Discussion

20.	The function of "Sodium pump" is a biological process operating in each and every cell of all animals. Which of the following biologically important ions is also a constituent of this pump?
Answer» `Mg^(2+)` `K^(+)` `FE^(2+)` `CA^(2+)` Answer :B

Discussion

21.	The function of sand in mortar is
Answer» To decreases the hardness To make the MASS compacat To decreases the plasiticity of the mass To prevent excessive SHRINKAGE which might result in cracsks SOLUTION :To AVOID shrinkage SAND is added to mortar

Discussion

22.	The function of gum Arabic in the preparation of Indian ink is
Answer» COAGULATION peptization protective action adsorption Answer :B

Discussion

23.	The function of boiling the sodium extract with conc. HNO_(3) before testing for halogen as:
Answer» to make the solution acidic to make the solution clear to CONVERT `Fe^(2+)` to `Fe^(3+)` to destroy `CN^(-)` and `S^(2-)` ions Solution :If N and S are ALREADY present, they will hinder in test of halogens as `NaCN` and `Na_(2)S` will GIVE white or black precipitate with `AgNO_(3)`. Boiling conc. `HNO_(3)` is thus used to remove `CN^(-)` and `S^(2-)` ions in the FORM of volatile HCN and `H_(2)S`.

Discussion

24.	The function of anhydrous aluminium chloride in the Friedel-Craft's reaction is
Answer» Absorb water To absorb hydrochloric ACID To PRODUCE an ELECTROPHILE To produce nucleophile Solution :`AlCl_3` will LEAD to the formation of carbocation.

Discussion

25.	The fully eclipsed conformation of n - butane is least stable due to the presence of
Answer» BOND OPPOSITION strain only STERIC strain only Bond opposition strain as well as steric strain No strain is present in the molecule. Solution :Steric strain

Discussion

26.	The fullform DDT is ........
Answer» SOLUTION :DICHLORODIPHENYLTRICHLOROETHANE

Discussion

27.	The fuel used to produce electrical energy in the space rocket saturn V which Neil Armstrong reached the Moon is
Answer» `CO+O_(2)` `F_(2)+O_(2)` `CH_(4)+O_(2)` liquid `H_(2)+O_(2)` ANSWER :D

Discussion

28.	A fuel has the same knocking property as a mixture of 70% isooctane (2,2,-4 trimethyl pentane) and 30% n heptane by volume, the octane number of the fuel is
Answer» ANSWER :F

Discussion

29.	The fuel gas having volume composition equal to 44%CH_(4)+48%H_(2)+5%N_(2)+3%CO is
Answer» oil gas water gas COAL gas petrol gas Solution :Coal gas = 44% `CH_(4)+48% H_(2) + 5% N_(2) + 3% `CO

Discussion

30.	The fuel gas with highest composition of hydrogen is
Answer» COAL GAS WATER gas Semiwater gas Carburated water gas Answer :A

Discussion

31.	The fresh precipitate can be transformed in colloidal state by
Answer» Peptisation coagulation Diffusion None of these Solution :CONVERSION of fresh PRECIPITATE into colloidal SOLUTIO is KNOWN as peptisation.

Discussion

32.	The Friedel-Crafts alkylation...
Answer» WORKS well for primary chlorides Works very well for tertiary chlorides Works very well for acyl chlorides Works very well without catalyst Solution :Friedel crafts REACTION with CARBONIUM ion rearrangement

Discussion

33.	The frequency transition n = 4 to n = 2 of He+ is equal to the transition in H atom corresponding to which of the following.
Answer» n=3 to n=1 n=2 to n=1 n=32 to n=1 n=4 to n=3 Answer :B

Discussion

34.	The frequency of the spectral line obtained when the electron in n = 3 of Hydrogen atom drops to the ground state is
Answer» `2.925xx10^(15)` HERTZ `2.925xx10^(13)` Hertz `2.925xx10^(13)` Hertz `36559xx10^(10)` Hertz Solution :`UPSILON = cbar(upsilon)= cR((1)/(n_2^2) - 1/(n_2^2))` `=3xx10 xx 109677 [1/1 -1/9]` `=32.9xx10^(14) [8/9] = 2.925 xx 10^(15) Hz`

Discussion

35.	The frequency of the radiation emitted when the electron falls from n = 4 to n = 1 in a hydrogen atom will be (Given ionization energy of H = 2.18 xx 10^(-18) J "atom"^(-1) and h = 6.625 xx 10^(-34) Js)
Answer» `1.54 XX 10^(15) s^(-1)` `1.03 xx 10^(15) s^(-1)` `3.08 xx 10^(15) s^(-1)` `2.0 xx 10^(15) s^(-1)` SOLUTION :`IE. = E_(oo) - E_(1) = 0 - E_(1) = 2.18 xx 10^(-18) J "atom"^(-1)` Thus, `E_(n) = - (2.18 xx 10^(-18))/(n^(2)) J "atom"^(-1)` `DELTA E = E_(4) - E__(1) = -2.18 xx 10^(-18) ((1)/(4^(2)) - (1)/(1^(2)))` `= 2.044 xx 10^(-18) J "atom"^(-1)` `Delta E = hv` or `v = (Delta E)/(h) = (2.044 xx 10^(-18)j)/(6.625 xx 10^(-34)JS) = 3.085 xx 10^(15) s^(-1)`

Discussion

36.	The frequencyof yellowlighthavingwavelength600 nm is
Answer» `5.0 XX 10^(14) Hz` `2.5 xx 10^(7) Hz` `5.0 xx 10^(7) Hz` `2.5 xx 10 ^(14) Hz` ANSWER :A

Discussion

37.	The frequency of the characterstic X ray of K_(alpha) line of metal target 'M' is 2500 cm^(-1) and the graph between sqrt(v) Vs 'z' is as follows, then atomic number of M is
Answer» 49 50 51 25 Answer :C

Discussion

38.	The frequency of one of the lines in Paschen series of hydrogen atom is 2.340 xx 10^(14)Hz. What is the quantum number n_(2) which produces this transition ?
Answer» Solution :`bar(v) = R_(H) ((1)/(n_(1)^(2)) - (1)/(n_(2)^(2)))` `bar(v) = (1)/(LAMDA), C = v lamda or (1)/(lamda) = (v)/(c)` `:. v = c R_(H) ((1)/(n_(1)^(2)) - (1)/(n_(2)^(2)))` For Paschen series, `n_(1) = 3` `:. 2.340 xx 10^(14) = (3 xx 10^(8) ms^(-1)) xx (1.097 xx 10^(7) m^(-1)) ((1)/(3^(2)) - (1)/(n_(2)^(2)))` or `((1)/(3^(2)) - (1)/(n_(2)^(2))) = (2.340 xx 10^(14))/(3.291 xx 10^(15)) = 0.071` or `(1)/(n_(2)^(2)) = (1)/(9) - 0.071 = 0.111 - 0.071 = 0.04 or n_(2)^(2) = 25 or n_(2) = 5`

Discussion

39.	The frequency of light emitted for the transition n = 4 " to " n = 2 of He^(+) is equal to the transition in H atom corresponding to which of the following :
Answer» `n = 3 " to " n = 1` `n = 2 " to " n = 1` `n = 3 " to " n = 2` `n = 4 " to " n = 3` Solution :`bar(v) = R ((1)/(n_(1)^(2)) - (1)/(n_(2)^(2))) Z^(2)` `v = (C)/(lamda) = cbar(v) or bar(v) = (v)/(c)` `:. (v)/(c) = R ((1)/(n_(1)^(2)) - (1)/(n_(2)^(2))) Z^(2)` or `v = Rc ((1)/(n_(1)^(2)) - (1)/(n_(2)^(2))) Z^(2) = R' ((1)/(n_(1)^(2)) - (1)/(n_(2)^(2))) Z^(2)` For `He^(+)`, for TRANSITION `n = 4 " to " n = 2` `v = R' ((1)/(2^(2)) - (1)/(4^(2))) xx 2^(2) = R' ((1)/(1^(2)) - (1)/(2^(2)))` For H, Z = 1, therefore for same VALUE of v, transition will be form `n = 2 " to " n = 1`

Discussion

40.	The frequency of an electromagnetic radiation is 2xx10^6 Hz. What is its wavelength in metres (Velocity of light =3xx10^8 ms^(-1))
Answer» `6.0xx10^14` `1.5xx10^4` `1.5xx10^2` `0.66xx10^(-2)` SOLUTION :When `c=vxxlambda` than `lambda=c/v=(3xx10^8)/(2xx10^6)=1.5xx10^2` m

Discussion

41.	The frequency of a wave of light is 12xx10^14 s^(-1) . The wave number associated with this light is
Answer» `5XX10^(-7) m` `4XX10^(-8) cm^(-1)` `2xx10^(-7) m^(-1)` `4xx10^(4) cm^(-1)` Solution :Frequency `v=12xx10^14 s^(-1)` and VELOCITY of light `c=3xx10^10 cm s^(-1)` . We know that the wave number `barv=v/c =(12xx10^14)/(3xx10^10)=4xx10^4 cm^(-1)`

Discussion

42.	The frequency of a radiation having a wave number of 2 xx10^(14) "cm"^(-1) will be x xx 10^(24) s^(-1) .Then the value of x is ____
Answer» Solution :`V= cbarv = (3XX 10^(10)) (2xx10^(14)) = 6xx10^(24)s^(-1)`

Discussion

43.	The frequency associated with photon of radiation having a wavelength of 6000 Å is
Answer» `5xx10^(14)HZ` `4.26xx10^(10)Hz` `2xx10^(14)Hz` `5xx10^(15)Hz` Answer :A

Discussion

44.	The freezing point of 3.75xx10^(-2)M aqueous solution of weak acid HA is 272.9K. The molality of the solution was found to be 0.0384 molal. Find the [H^(+)] of the solution on adding 3.75xx10^(-2) moles of NaA to one litre of the above solution. (K_(f) "of water" =1.86 "molal"^(-1))
Answer» ANSWER :`6.89xx10^(-3)M;`

Discussion

45.	The freezing point of 0.05M urea solution is differnet from that of 0.05 M sodium chloride solution The depression in freezing point is directly propotional to the number of species present in the solution .
Answer» SOLUTION :EXPLANTION is CORRECT REASON for STATEMENT

Discussion

46.	The freezing point depression constant for water is1.86 ^(@) K kg mol ^(-1), I f5g Na_2 SO_4 is dissolved in 45 g water the depression in freezingpoint as 3.64 ^(@) C The Vant Hoff factor forNa_2 SO_4 is
Answer» `2.50` `2.63` `3.64` `5.50` ANSWER :A

Discussion

47.	The freezing point depression constant for water is 1. 86^(@)K gm mol ^(-1). If 5g Na _(2) SO_(4) is dissolved in 45 g water, the depression in freezing point is 3.64 ^(@)C. The van't Hoff factor for Na _(2) SO _(4) is ……
Answer» `2.50` `2.63` `3.64` `5.50` Solution :`K _(f) = 1. 86 , W_(2) = 5g, DELTA T _(f ) =3.64, M _(2) = 142, W_(1) = 45 g` `Delta T_(f) = I xx K _(f)` `i = (Delta T _(f) xxM _(2) xx W_(1))/( K _(f) xx W _(2) xx 1000)` `= (3.64 xx 142 xx 45)/(1. 86 xx 5 xx 1000)` `i = 2.5`

Discussion

48.	The free energy changes for the two reactions given below are : (i) SO_(2)(g) + Cl_(2)(g) rarr SO_(2)Cl_(2)(g) , DeltaG= - 2270 cal (ii) S(rhom) + O_(2)(g) + Cl_(2) (g) rarr SO_(2)Cl_(2)(g) , DeltaG = - 74060 cal Find the Delta G for the reaction : S ( rhom ) + O_(2)(g) rarr SO_(2)(g)
Answer» SOLUTION :EQN. (ii) - Eqn. (i) gives the required result.

Discussion

49.	The fragrance of flowers is due to the presence of some steamm volatile organic compounds called essential oils. These are generally insoluble in water at room temperature but are miscible with water vapour in vapour phase. A suitable method for the extraction of these oils from the flowers is
Answer» distillation crystallisation distillation under reduced pressure STEAM distillation Solution :Steam distillation is USED to separate SUBSTANCES which are steam volatile and are IMMISCIBLE with water.

Discussion

50.	The fragrance of flowers is due to the presence of some steam volatile organic compounds called essential oils. These are generally insoluble in water at room temperature but are miscible with water vapour in vapour phase. A suitable method for the extraction of these oils from the flowers is :
Answer» Distillation Crystallisation Distillation under REDUCED PRESSURE Steam distillation Solution :SUBSTANCES (i.e., essential oils) are insoluble in water and have high vapour pressure at 373 K and hence can be separated by steam distillation.

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

The gas produced by the passage of air over hot coke is

The gas phase reaction shown is endothermic as written. Which, change(s) will increase the quantity of CH_(3)CH=CH_(2) at equilibrium? (P) Increasing the temperature (Q) Increasing the pressure H_(3)C-CH=CH_(2)hArr

The gas liberated when aluminium reacts with conc. H_2 SO_4 is

The gas liberated when aluminium reacts with conc. H_(2)SO_(4) is

The gas liberated by the electrolysis of Dipotassium succinate solution is :

The gas leaked from a storage tank of the Union Carbide plant in Bhopal gas tragedy was:

The gas leaked from a storage tank of the union Carbide plant in Bhopal gas tragedy was

The gas emitted by supersonic jet planes that slowly depletes the ozone layer is

The gas emitted by supersonic jet planes that slowly depletee the ozone layer is

The gas constant R represents work done

The g/L of 5 M aqueous solution of NaOH is ....... (Molecular mass of NaOH : 40 g " mole"^(-1) )

The functional group(s) present in H_(3)C-CH_(2)-O-CH_(2)-overset(O)overset("||")("C")-OCH_(3)

The functional groups in cortisone are:

The function of sodium pump is a biological process operating in each and every cell of all animals . Which of the following biologically important ions is also a constituent of the pump ?

The function of ZnCl_(2) in Lucas test for alcohols is

The function of "Sodium pump" is a biological process operating in each and every cell of all animals. Which of the following biologically important ions is also a constituent of this pump?

The function of sand in mortar is

The function of gum Arabic in the preparation of Indian ink is

The function of boiling the sodium extract with conc. HNO_(3) before testing for halogen as:

The function of anhydrous aluminium chloride in the Friedel-Craft's reaction is

The fully eclipsed conformation of n - butane is least stable due to the presence of

The fullform DDT is ........

The fuel used to produce electrical energy in the space rocket saturn V which Neil Armstrong reached the Moon is

A fuel has the same knocking property as a mixture of 70% isooctane (2,2,-4 trimethyl pentane) and 30% n heptane by volume, the octane number of the fuel is

The fuel gas having volume composition equal to 44%CH_(4)+48%H_(2)+5%N_(2)+3%CO is

The fuel gas with highest composition of hydrogen is

The fresh precipitate can be transformed in colloidal state by

The Friedel-Crafts alkylation...

The frequency transition n = 4 to n = 2 of He+ is equal to the transition in H atom corresponding to which of the following.

The frequency of the spectral line obtained when the electron in n = 3 of Hydrogen atom drops to the ground state is

The frequency of the radiation emitted when the electron falls from n = 4 to n = 1 in a hydrogen atom will be (Given ionization energy of H = 2.18 xx 10^(-18) J "atom"^(-1) and h = 6.625 xx 10^(-34) Js)

The frequencyof yellowlighthavingwavelength600 nm is

The frequency of the characterstic X ray of K_(alpha) line of metal target 'M' is 2500 cm^(-1) and the graph between sqrt(v) Vs 'z' is as follows, then atomic number of M is

The frequency of one of the lines in Paschen series of hydrogen atom is 2.340 xx 10^(14)Hz. What is the quantum number n_(2) which produces this transition ?

The frequency of light emitted for the transition n = 4 " to " n = 2 of He^(+) is equal to the transition in H atom corresponding to which of the following :

The frequency of an electromagnetic radiation is 2xx10^6 Hz. What is its wavelength in metres (Velocity of light =3xx10^8 ms^(-1))

The frequency of a wave of light is 12xx10^14 s^(-1) . The wave number associated with this light is

The frequency of a radiation having a wave number of 2 xx10^(14) "cm"^(-1) will be x xx 10^(24) s^(-1) .Then the value of x is ____

The frequency associated with photon of radiation having a wavelength of 6000 Å is

The freezing point of 3.75xx10^(-2)M aqueous solution of weak acid HA is 272.9K. The molality of the solution was found to be 0.0384 molal. Find the [H^(+)] of the solution on adding 3.75xx10^(-2) moles of NaA to one litre of the above solution. (K_(f) "of water" =1.86 "molal"^(-1))

The freezing point of 0.05M urea solution is differnet from that of 0.05 M sodium chloride solution The depression in freezing point is directly propotional to the number of species present in the solution .

The freezing point depression constant for water is1.86 ^(@) K kg mol ^(-1), I f5g Na_2 SO_4 is dissolved in 45 g water the depression in freezingpoint as 3.64 ^(@) C The Vant Hoff factor forNa_2 SO_4 is

The freezing point depression constant for water is 1. 86^(@)K gm mol ^(-1). If 5g Na _(2) SO_(4) is dissolved in 45 g water, the depression in freezing point is 3.64 ^(@)C. The van't Hoff factor for Na _(2) SO _(4) is ……

The free energy changes for the two reactions given below are : (i) SO_(2)(g) + Cl_(2)(g) rarr SO_(2)Cl_(2)(g) , DeltaG= - 2270 cal (ii) S(rhom) + O_(2)(g) + Cl_(2) (g) rarr SO_(2)Cl_(2)(g) , DeltaG = - 74060 cal Find the Delta G for the reaction : S ( rhom ) + O_(2)(g) rarr SO_(2)(g)

The fragrance of flowers is due to the presence of some steamm volatile organic compounds called essential oils. These are generally insoluble in water at room temperature but are miscible with water vapour in vapour phase. A suitable method for the extraction of these oils from the flowers is

The fragrance of flowers is due to the presence of some steam volatile organic compounds called essential oils. These are generally insoluble in water at room temperature but are miscible with water vapour in vapour phase. A suitable method for the extraction of these oils from the flowers is :