52671 + Interview Questions in Chemistry in Class 11

1.	Gases best follow the facts given below A) An ideal gas obeys the mathematical relation PV=nRT B) Rates of diffusion of two gases are in the reciprocal ratio of square roots of their molecular weight C) Total pressure of a mixture of non reacting gases is given by the algebric sum of their partial pressure An ideal gas is captured in a glass tube of uniform arca of cross section by awater column at a given temperature as shown If the tube is held vertical, by what length the water column descends down? (Density of mercury=13.6gm/cc) (P_(atm)=76cm of Hg)
Answer» 2.2 cm 3.2 cm 1.03 cm 4.07 cm Solution :Pressure DUE to water column in terms of mercury is given by `h_1d_1 = h_2d_2` `27.2 xx 1 = h_2 xx 13.6 implies h_2 = 2 cm` When HELD vertical , `P_("gas") = P_("atm") + 2 cm of Hg` `= 76+ 2` `= 78 cm of Hg`. `P_1 V_1= P_2V_2 = > 76 xx 40 xx A = 78 xx l xx A` `implies l = 38.97 implies "DESCENT" = 40 - 38.97` `= 1.03 cm`.

Discussion

2.	Gaseous molecules heavy (e.g Br_(2)) or light (H_(2)) in equal number occupy the same volume at same P and T The distance between molcules in a definite volume is much larger than the actual dimension of molecule .
Answer» Solution :Statement REPRESENT AVOGADRO's law which is JUSTIFIED by the EXPLANTION .

Discussion

3.	Ground state electronic configuration of p atom can be represented as
Answer» `UARR DARR uarr darr uarr uarr uarr` `uarr darr uarr darruarr darr uarr` `uarr darr uarr darr uarr darr darr` `uarr darr uarr darr darr darr darr` SOLUTION :`1s^2 2s^2 2p^3`

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4.	Gaseous elements are monotomic or diatomicComment.
Answer» Solution :NOBLE GASES are monoatomic . Elementary gases are diatomic. However , One GASEOUS element is even available as TRIATOMIC, `O_(3)`.

Discussion

5.	Gaseous benzene reacts with hydrogen gas in presence of a nickel catalyst to form gaseous cyclohenane according to the reaction C_(6) H_(6) (g) + 3H_(2) (g) rarr C_(6) H_(12) (g) A mixture of C_(6)H_(6) and excess H_(2)has a pressure of 60 mm of Hg in an unknown volume. After the gas had been passed over a nickel catalyst and all the benzene converted to cyclohexane, the pressure of the gas was 30 mm of Hg in the same volume at the same temperature. The fraction of C_(6)H_(6) (by volume) present in the original volume is
Answer» `1//3` `1//4` `1//5` `1//6` SOLUTION :`C_(6)H_(6) (g) + 3H_(2) (g) rarr C_(6) H_(12) (g)` Initial pressure = 60 mm Final pressure = 30 mm since `p PROP n` `:.` Initial pressure of 60 mm is because of 4 moles and hence pressure due to one mole = 15 mm Now if `x` is fraction of `C_(6)H_(6)` which combines then for the REACTION `{:(C_(6)H_(6),+,3H_(2) rarr,C_(6) H_(12)),(15 - x,,45 - 3X,x):}`

Discussion

6.	Gas used in refrigirators is
Answer» T.E.L `C_8H_(18)` `C Cl_2 F_2` `C Cl_3 NO_2` ANSWER :C

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7.	Gas released during Bhopal tragedy was
Answer» Methyl isocyanate POTASSIUM ISOTHIOCYANATE Sodium isothiocyanate ETHYL isothiocyanate Solution :Gas released during Bhopla tragedy was methuyl isocyanate

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8.	……gas produce in Duman method but …….gas produce in Kjeldahl's method
Answer» SOLUTION :`N_(2), NH_(3)`

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9.	Name the gas law which gives the relationship between the pressure and temperature of a fixed amount of gas at a constant volume.
Answer» SOLUTION :GAY Lussac.s LAW

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10.	Gas laws are relationship between the measurable properties of gases. Draw the graph to illustrate the relationship between temperature and pressure of a fixed amount of gas at constant volume.
Answer» SOLUTION :

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11.	.........gas is used in the process of photosynthesis.
Answer» SOLUTION :`CO_(2)`

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12.	Gas laws are relationship between the measurable properties of gases. A definite quantity of an ideal gas is confined in a container of constant volume. When the container is immersed in a bath of melting ice, the pressure of the gas is 800mm of Hg. Find the temperature when the gas pressure is 400mm of Hg.
Answer» SOLUTION :`p_1/T_1 = p_2/T_2` `p_1 = 800 `MM of Hg,`p_2` = 400 mm of Hg `T_1` = 273K,`T_2 = ? LT`Substituting we get 800/273 = `400/T_2` `800xxT_2` = `273xx400` `therefore T_2 = (273xx400)/800` = 136.5K = 136.5-273 = `-136.5^@C`

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13.	……gas is produce in Kjeldahl's method and absorbed in ……..
Answer» SOLUTION :`NH_(3), H_(2)SO_(4)`

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14.	Gas deviates from ideal gas bahaviour because molecules
Answer» are colourless attract each other contain COVALENT bond show brownian movement Answer :B

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15.	Gas equation PV=nRT is obeyed by
Answer» only ISOTHERMAL process only adiabatic process Both (a) and (b) None OFTHESE. ANSWER :C

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16.	Gas commonly used in refrigirators is
Answer» T.E.L `C_(8) H_(18)` `"CCL"_(2) F_(2) ` `"CCl"_(3) NO_(2)` Answer :C

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17.	Gas (A_(x)) has the ratio of molar specific heats equal to 1.66. The value of x will be _____
Answer» Solution :`gamma = 1.66 = (5)/(3) RARR` ATOMICITY =1

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18.	Gammexane is :
Answer» DDT hexachlorobenzene (HCB) benzene hexachloride (BHC) CHLORAL Answer :C

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19.	Gammaxene is .. . . Isomer of benzene hexa chloride.
Answer» `ALPHA` `BETA` `gamma` `delta` Solution :`gamma`-FORM

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20.	Galvanishing of iron sheets is done by
Answer» CU PLATING Zn plating As plating Tin plating Solution :Galvinisation of iron sheets is DONE by zinc plating.

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21.	Gallium lies below aluminium in group 13 of the periodictablebut itsatomicradiusis smallerthan that ofaluminium. Why so ?
Answer» Solution :DUE to poorshielding of the valenceelectrons of GABY the inner 3d-electrons , the effectivenuclearcharge of GA is greaterin magnitudethan that of AL. As a result , the electronin gallium experience greaterforce of attractionby the NUCLEUS than in Aland hence atomic size of Ga (135pm)is slightly lessmuch higher than that of Al (143pm).

Discussion

22.	Gallium has muchhigher atomicnumberthan aluminium yet its atomicradius is lower thanthat of aluminium. Justify.
Answer» Solution :DUE to poorshielding of the valenceelectrons of Gaby the inner 3d-electrons , the effectivenuclearcharge of Ga is greaterin magnitudethan that of Al. As a RESULT , the electronin gallium experience greaterforce of attractionby the nucleus than in ALAND HENCE atomic size of Ga (135pm)is SLIGHTLY lessmuch higher than that of Al (143pm).

Discussion

23.	Gallium acts as reducing agent because
Answer» `GA^(3+)` state is less stable than `Ga^(+1)` `Ga^(3+)` state is more stable than `Ga^(+1)` `Ga^(3+)` covalence to `Ga^(+1)` REDUCING None of the above Solution :The stability of `+1` oxidation state is effective down the GROUP, but here `Ga^(3+)` is more stable than `Ga^(+1)`

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24.	Gain of electron or electrons is termed
Answer» combustion oxidation reduction neutralisation Answer :C

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25.	Gadoliniumbelongsto 4f series. Itsatomicnumberis 64.Which of thefollowingis the correctelectronicconfigurationof gadolinium ?
Answer» `[Xe] 4f^(9)5s^(1)` `[Xe] 4f^(7)5D^(1)6S^(2)` `[Xe] 4f^(6)5d^(2)6s^(2)` `[Xe] 4f^(8)6D^(2)` Solution :NA

Discussion

26.	[G] Match the salts in Column-I with the ratio of van't Hoff factor in Column-II : {:(,"Column-I",,"Column-II"),("(a)","Glucose, fructose, sucrose","(p)",1:2:3),("(b)","KCl,MgCl"_(2)",FeCl"_(3),"(q)",1:3:4),("(c)",K_(4)[Fe(CN)_(6)],Na_(3)PO_(4)","Al_(2)(SO_(4))_(3),"(r)",2:3:4),("(d)","Urea, KCl, CaCl"_(2),"(s)",1:1:1):} [Note : Assume that the electrolytes are completely ionised.
Answer» ANSWER :(a-s);(b-r);(c-s);(d-p)

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27.	Comment over the following statement Ga_2 O_3 is an amphoteric oxide.
Answer» ANSWER :1

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28.	(G) is NaHCO_(3) The other compound formed with (G) is
Answer» `NH_(4)C_(1)` NaCl `CaCl_(2)` Both (a) and (b) Solution :`NH_(4)HCO_(3)+NaCIrarrNAHCO_(3)+MNH_(4)CI` `2NaHCO_(3) overset(triangle)rarrNa_(2)CO_(3)+H_(2)O+CO_(2)`

Discussion

29.	Fusion of AgCl with Na_(2)CO_(3) gives:
Answer» `Ag_(2)CO_(3)` silver carbide AG `Ag_(2)O` SOLUTION :`AgCl + Na_(2)CO_(3) rarrNaCl + CO_(2) + Ag`

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30.	Fusion bomb involves
Answer» Combinations of lighter nuclei into BIGGER nucleus Destruction of heavy nucleus into smaller nuclei Combustion of oxygen Explosion of TNT Solution :Fusion BOMB INVOLVES combinations of lighter nuclei into bigger nucleus.

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31.	Fusel oil is a mixture of
Answer» Ethers ALCOHOLS Alcohols and ethers Alcohols and ketones Solution :FUSEL OIL is a MIXTURE of alcohols.

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32.	Furan (C_4H_2O)is an ......... compound.
Answer» SOLUTION : AROMATIC

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33.	Functional isomer of carboxylic acid is
Answer» Amide Acid chloride Fatty acid Alkylalkanoate Answer :D

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34.	The function of anhydrous AlCl_(3) in the Friedel-Crafts reaction is to
Answer» To ABSORB water To absorb hydrochloric acid To produce an electrophile To produce nucleophile SOLUTION :`R + CL + AlCl_3 to overset(oplus)R "(electrophile)" + overset(Ɵ)(A)lCl_4`

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35.	Fullerene has 12 rings of 6 memberes and 20 rings of 5 memberes
Answer» SOLUTION :FALSE STATEMENT

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36.	Fuel gas with highest calorific value among the following
Answer» COAL GAS WATER gas Carburetted water gas Semi water gas ANSWER :A

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37.	Froth floatation process is used for the concentration of
Answer» OXIDE ores sulphide ores chlorine ores amalgams Answer :(B)

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38.	Fronm where does ozone come in the photochemical smog?
Answer» Solution :(i) Photochemical smog is formed by the combination of smoke, DUST and FOG with air pollutants in the presence of sunlight. (ii) Chemically it is oxidising in nature because of high concentration of oxidising agents such as` N_(3)` and `O_(3)` So it is ALSO called oxidising smog. (iii) Photochemical smog is formed by following reactions: `N_(2) + O_(2) rarr 2NO` `2NO + O_(2) rarr 2NO_(2)` `NO_(2) overset("sunlight")rarr NO+(O)` `(O)_(3)NO rarr NO_(2) + O_(2)` `NO_(2) overset("sunlight") rarr NO + (O)` (iv) NO and `O_(3)` are strong oxidising agents and they can REACT with unburnt hydrocarbons in polluted air to FORM formaldehyde, acrolein and PAN.

Discussion

39.	From which source maximum hydrogen is obtained ?
Answer» SOLUTION :MAXIMUM HYDROGEN is OBTAINED from PETROCHEMICAL.

Discussion

40.	From which reaction H_(2)O_(2) act as reducing agent?
Answer» `Ag_(2)O+H_(2)O_(2)to2Ag+H_(2)O+O_(2)` `2KI+H_(2)O_(2)to2KOH+I_(2)` `2FeSO_(4)+H_(2)O_(2)+H_(2)SO_(4)toFe_(2)(SO_(4))_(3)+2H_(2)O` `HNO_(2)+H_(2)O_(2)toHNO_(3)+H_(2)O` ANSWER :A

Discussion

41.	From which one of the following both ethylene and acetylene could be prepared in a single step reaction ?
Answer» `CH_3CH_2OH` `Br-CH_2-CH_2-Br` `CH_3CH_2Br` `Br-CH_2-CH_2-OH` SOLUTION :`BrCH_2-CH_2Br UNDERSET((-ZnBr_2))OVERSET(Zn//CH_3OH, DELTA)to CH_2=CH_2` `BrCH_2-CH_2Br overset(NaNH_2 "in LIQ."NH_3)to HC-=CH`

Discussion

42.	From which of the places the boiling point will be less ? Why sea and mountain ?
Answer» SOLUTION :At HIGH altitudes atmospheric pressure is low therefore liquids at high altitudes BOIL at LOWER temperatures in comparison to that at sea level.

Discussion

43.	From which of the following having maximum and minimum vapour pressure ? Acetone, ether and ethanol ?
Answer» SOLUTION :Ether having MAXIMUM vapour pressure and ETHANOL having MINIMUM vapour pressure.

Discussion

44.	From which industry phenol waste produced ?
Answer» Sugar PETROLEUM DETERGENT PESTICIDES SOLUTION :Petroleum

Discussion

45.	From which harmful effect ozone layer protects all living being ?
Answer» Ultraviolet radiations COMING from sunlight. `CO_2` in atmosphere. Effect of poisonous GAS from COMBUSTION of hydrocarbon All of the above SOLUTION :Ultraviolet radiations coming from sunlight.

Discussion

46.	From which industry aromatic organic compound are produced ?
Answer» Dairy PESTICIDE FERTILIZERS SUGAR SOLUTION :Pesticide

Discussion

47.	From where does ozone come in the photo-chemical smog ?
Answer» Solution :Sunlight cause photochemical decomposition of `NO_2` into NO and O. `NO_2 overset(hv)to NO + [O]` Atomic OXYGEN is a HIGHLY reactive species. It combines with diatomic oxygen and forms ozone. `O_2 + O + M to O_3 + M` Where, M is inert GAS such as NITROGEN. This `O_3` is FORMED during the formation of smog.

Discussion

48.	From where ozone come in the photochemical smog?
Answer» Solution :(i) Photochemical smog is formed by the combination of SMOKE, dust and fog with air pollutants in the presence of sunlight. (ii) Chemically it is oxidising in nature because of high concentration of oxidising agents such as `NO_(2) and O_(3)`. So it is also called oxidising smog. (iii) Photochemical smog is formed by following reactions: `N_(2) + O_(2) rarr 2NO` `2NO + O_(2) rarr 2NO_(2)` `NO_(2) overset("sunlight")rarr NO + (O)` `(O) + O_(2) rarr O_(3)` `O_(3) + NO rarr NO_(2) + O_(2)` `NO_(2) overset("sunlight")rarr NO + (O)` (iv) No and `O_(3)` are strong oxidising agents and they can REACT with unburnt HYDROCARBONS in polluted air to FORM formaldehyde, acrolein and PAN.

Discussion

49.	From where the biodegradeble wastes are generated ?
Answer» Solution :Biodegradable WASTES are GENERATED by cotton mills, FOOD processing units, paper mills, and textile FACTORIES.

Discussion

50.	Fromwherethe firstorbitalof s, p , d, f start?
Answer» Solution :s orbitalfrom n=1 firsts 1 s p orbitalfrom n= 2 first2p d orbitalfrom n=3 first3d F orbitalfrom n= 4 first4 f

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Gaseous molecules heavy (e.g Br_(2)) or light (H_(2)) in equal number occupy the same volume at same P and T The distance between molcules in a definite volume is much larger than the actual dimension of molecule .

Ground state electronic configuration of p atom can be represented as

Gaseous elements are monotomic or diatomicComment.

Gas used in refrigirators is

Gas released during Bhopal tragedy was

……gas produce in Duman method but …….gas produce in Kjeldahl's method

Name the gas law which gives the relationship between the pressure and temperature of a fixed amount of gas at a constant volume.

Gas laws are relationship between the measurable properties of gases. Draw the graph to illustrate the relationship between temperature and pressure of a fixed amount of gas at constant volume.

.........gas is used in the process of photosynthesis.

……gas is produce in Kjeldahl's method and absorbed in ……..

Gas deviates from ideal gas bahaviour because molecules

Gas equation PV=nRT is obeyed by

Gas commonly used in refrigirators is

Gas (A_(x)) has the ratio of molar specific heats equal to 1.66. The value of x will be _____

Gammexane is :

Gammaxene is .. . . Isomer of benzene hexa chloride.

Galvanishing of iron sheets is done by

Gallium lies below aluminium in group 13 of the periodictablebut itsatomicradiusis smallerthan that ofaluminium. Why so ?

Gallium has muchhigher atomicnumberthan aluminium yet its atomicradius is lower thanthat of aluminium. Justify.

Gallium acts as reducing agent because

Gain of electron or electrons is termed

Gadoliniumbelongsto 4f series. Itsatomicnumberis 64.Which of thefollowingis the correctelectronicconfigurationof gadolinium ?

Comment over the following statement Ga_2 O_3 is an amphoteric oxide.

(G) is NaHCO_(3) The other compound formed with (G) is

Fusion of AgCl with Na_(2)CO_(3) gives:

Fusion bomb involves

Fusel oil is a mixture of

Furan (C_4H_2O)is an ......... compound.

Functional isomer of carboxylic acid is

The function of anhydrous AlCl_(3) in the Friedel-Crafts reaction is to

Fullerene has 12 rings of 6 memberes and 20 rings of 5 memberes

Fuel gas with highest calorific value among the following

Froth floatation process is used for the concentration of

Fronm where does ozone come in the photochemical smog?

From which source maximum hydrogen is obtained ?

From which reaction H_(2)O_(2) act as reducing agent?

From which one of the following both ethylene and acetylene could be prepared in a single step reaction ?

From which of the places the boiling point will be less ? Why sea and mountain ?

From which of the following having maximum and minimum vapour pressure ? Acetone, ether and ethanol ?

From which industry phenol waste produced ?

From which harmful effect ozone layer protects all living being ?

From which industry aromatic organic compound are produced ?

From where does ozone come in the photo-chemical smog ?

From where ozone come in the photochemical smog?

From where the biodegradeble wastes are generated ?

Fromwherethe firstorbitalof s, p , d, f start?