94420 + Interview Questions in Chemistry in Class 12

1.	SOCl_(2) can act as Lewis acid as well as Lewis base because
Answer» sulphur has a PAIR of ELECTRONS to DONATE it has empty d-orbital to ACCEPT electrons sulphur is a non metal chlorine is more electronegative SOLUTION :Due to the presence of empty d-orbitals. It accept `e^((-))s` and the central atom S contains along pair of electrons.

Discussion

2.	Soda ash has the chemical formula :
Answer» `Na_(2)CO_(3)` `NaHCO_(3)` NaOH `Na_(2)O` ANSWER :A

Discussion

3.	Soaps essentially form a colloidal solution in water and remove the greasy matter by:
Answer» coagulation emulsification adsorption ABSORPTION. ANSWER :B

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4.	Soaps do not from froths easily from hard water because :
Answer» Of formation of insoluble SALTS Of formation of complex salts Of lower solubility of SOAPS in HARD water None Answer :A

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5.	Soaps are anionic detergents.
Answer» ANSWER :T

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6.	Soaps and detergents are kept in the for which of the following types of compounds?
Answer» SURFACE ACTIVE Surface inactive Water soluble Water insoluble Answer :A

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7.	Explain cationic and anionic detergents with suitable examples.
Answer» ANSWER :T

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8.	Soaps.
Answer» Solution :Soaps are sodium or potassium saltsof higher FATTY acids which contain more than twelve carbon ATOMS. Potassium soaps are SOFTER than sodium soaps and are USED in shampoo, SHAVING cream and bathing soaps. Sodium soaps are toilet soaps used for washing purposes.

Discussion

9.	Soap removes grease by
Answer» ADSORPTION EMULSIFICATION COAGULATION NONE of these SOLUTION :Emulsification

Discussion

10.	Soap molecule has two parts, a polar part and a non-palar part. When soap added to water:
Answer» Both parts dissolve in water Non-POLAR PART DISSOLVES in water Polar part dissolves in water Both parts remain UNDISSOLVED in water and form a hydrocarbon layer Answer :C

Discussion

11.	Soap is reacted with hard water gives
Answer» insoble `(RCOO)_(2)` Ca and soluble `(RCOO)_(2)Mg` SOUBLE `(R-COO)_(2)`Ca and insoble `(R-COO)_(2)Mg` Insouble `(R-COO)_(2)Ca` and `(R-COO)_(2)Mg` soluble`(R-COO)_(2)Ca` and `(R-COO)_(2)Mg` ANSWER :C

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12.	Soap is an example of an associated colloid.
Answer»

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13.	Soap is a weak antiseptic. What may be added to soaps to improve its antiseptic action?
Answer» SOLUTION :Bithional is ADDED to SOAPS to improve its ANTISEPTIC action.

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14.	Soap is a weak antiseptic. What may be added to soaps to improve its antiseptic action ?
Answer» Solution :BITHIONAL is added to SOAPS to IMPROVE its antiseptic properties.

Discussion

15.	Soap is____
Answer» SODIUM stearate calcium stearate sodium acetate sodium benzoate Answer :A

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16.	Soap emulsifies
Answer» OIL in WATER TYPE Water in oil type Oil in oil type Gel in oil Answer :A

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17.	Soap cannot form foam with hard water because ......
Answer» insoluble salt FORM insoluble salt of `Ca & Mg` form in water more TDS in HARD water DENSITY of hard water is more Solution :insoluble salt of `Ca & Mg` form in water

Discussion

18.	SO_(3)^(2-)+S^(*) overset("boil")to S S^()O_(3)^(2-),S S^()O_(3)^(2-)+2H^(+)toH_(2)SO_(3)+S^(*) The above reaction sequence proves:
Answer» Two sulphur atoms of THIOSULPHATE are not equivalent Both are equivalent Both of the above are correct None of these Solution :`O^(-)-UNDERSET(O)underset(\|\|)overset(S)overset(\|\|)(S^(6+))-O^(-)`

Discussion

19.	SO_3 on reacting with conc. HCL gives:
Answer» Chlorosulphuric ACID `Cl_2 + H_2SO_3` `Cl_2 + H_2SO_4` None Answer :A

Discussion

20.	SO_(3) gas is entering the environment at a constant rate of 6.93xx10^(-6) gm//L//day due to the emission of polluting gases from thermal powerplant, but at the sane time it is decomposing and following first order kinetic with half lif e of 100 days. Based on above infromation, select the true statement (s)
Answer» Concentration of `SO_(3)` in Kota is `1.25xx10^(-5)` M (ASSSUME `SO_(3)` present in Kota with constant concentration means rate of formation and dissociation of `SO_(3)` are equal). If `SO_(3)` emission is STOPPED then after `1000` days its concentration will REDUCE to `~~ 1.2xx10^(-8)` M. If `10^(3)` L of air passed throught 1 L pure water (assuming all `SO_(3)` to dissolved in it) and resulting solution is titrated against 1 N NaOH solution of which 15 ml is CONSUMED. An industry is manufacturing `H_(2)SO_(4)` at the rate of 980 kg per day with the use of `SO_(3)` in air itshould use `8xx10^(5)` Litre aid /day. Answer :A::B

Discussion

21.	SO_(3) gas is entering the environment at a constant rate of 6.93 xx 10^(–6) gm/L/day due to the emission of polluting gases from thermal power plant, but at the same time it is decomposing & following first order kinetics with half life of 100 days. Based on above information select the true statement(s).
Answer» Concentration of `SO_(3)` in Kota is `1.25 xx 10^(–5) M` (Assume `SO_(3)` present in air reaches STEADY state) If `10^(3)` L of air is passed through 1 L pure water (assuming all `SO_(3)` to be dissolved in it) & resulting solution is titrated against 1 N NaOH solution, 15 ml is required to reach end POINT. An INDUSTRY is manufacturing `H_(2)SO_(4)` at the rate of980 kgper DAY with the use of `SO_(3)` in air it should use `8 xx 10^(5)` Litre air /day. If `SO_(3)` emission is stopped then after 1000 days its concentrations will reduce to `~~ 1.2 xx10^(–8) M`. ANSWER :A::D

Discussion

22.	SO_(3) (g) is produced as : SO_(2) (g) + (1)/(2) O_(2) (g) hArr SO_(3) (g) At 900 K, 0.2 mol of SO_(2) and 0.4 mol of O_(2) are taken in 2L vesset. When equilibrium is reaches by concentration of SO_(3) (g) is 0.08 M. Then K_(C)^(0) for reaction is :
Answer» `(10)/(sqrt2)` `10^(-1)` `10` `100` Solution :`{:(,SO_(2) (g),+,(1)/(2)O_(2) (g),hArr,SO_(3) (g),T = 900 K,),("Concentration",(0.2)/(2),,(0.4)/(2),,,,),("initially",,,,,,,),("concentration",0.1 - x,,0.2 - (1)/(2) x,,x,,),(,x = 0.08 M,,,,,,),(,,,,,,,):}` `K_(C) = ([SO_(3)])/([SO_(2)] [O_(2)]^(1//2)) = (0.08)/(sqrt(0.16) XX 0.02) = 10`

Discussion

23.	SO_(3) can be prepared by which of the following reactions ?
Answer» `CaSO_(4) C OVERSET ("HEAT") to ` `Fe_(2)(SO_(4))_(3) overset("heat") to` `S+H_(2)SO_(4) overset("heat") to` `H_(2)SO_(4) + PCl_(5) overset("heat") to` Solution :`Fe_(2)(SO_(4))_(3) overset("heat") to Fe_(2)O_(3)+3SO_(3)`

Discussion

24.	SO_3 gas can be identified by exposing it to the
Answer» Glass rod dippend in CONC HCl Filter paper dipped in acidified `K_2Cr_2O_7` Filter paper dipped in lead acetate SOLUTION Glass rod dippend in `NH_4OH` ANSWER :B

Discussion

25.	Sulphur troxide can be obtained by which of the following reaction ?
Answer» `CaSO_(4)+C OVERSET(Delta)to` `Fe_(2)(SO_(4))_(3) overset(Delta)to` `S+H_(2)SO_(4) overset(Delta)to` `H_(2)SO_(4)+PCl_(5) overset(Delta)to` Solution :Except `SO_(2)` other gases are collected over water. Because `SO_(2)` soluble in `H_(2)O`.

Discussion

26.	SO_3 can be obtained by heating:
Answer» S + `H_2SO_4` `CaSO_4 + C` `FeSO_4` `H_2SO_4 + PCl_5` ANSWER :C

Discussion

27.	SO_(2(g))+2H_(2)S_((g))rarr3S_((s))+2H_(2)O_((l)) which will be the method to obtain sulphur sol by reaction shown above?
Answer» Double decomposition Oxidation REDUCTION HYDROLYSIS SOLUTION :Oxidation

Discussion

28.	SO_(2)Cl_(2)hArrSO_(2)+Cl_(2) is the first order gas reaction with k=2.2xx10^(-5)sec^(-1) at 320^(@)C. The percentage of SO_(2)Cl_(2) decomposed on heating for 90 minutes is
Answer» `1.118` `0.1118` `18.11` `11.30` Solution :`k=(2.303)/(t)log.(a)/((a-x))implieslog.(a)/((a-x))=(k.t)/(2.303)` `implieslog.(a)/(a-x)=(2.2xx10^(-5)xx60xx60)/(2.303)=0.0516` HENCE, `(a)/((a-x))=1.127implies(a-x)/(a)=0.887` `implies1-(x)/(a)=0.887implies(x)/(a)=0.113=11.3%`

Discussion

29.	SO_2Cl_2 to SO_2 +Cl_2 is a first order gas reaction with k = 2.2 xx 10^(-5) sec^(-1)" at " 320^@C Percentage of SO_2Cl_2 decomposed on heating for 90 minutes is
Answer» 0.0887 0.887 0.0113 0.113 Solution :`k = 2.303/tlog.(a)/ (a-x)or log.([A])_0/[A]_t= (KT)/2.303` `=(2.2 xx 10^(-5)xx 60 xx 90)/2.303 = 0.0516` Hence, `[A]_0/[A]_t=AL(0.0516) = 1.127` `or [A]_t/[A]_0= 1/1.127=0.887` AMOUNT decomposed `=1-[A]_t/[A]_0` `=1-0.887 = 0.113` % Amount decomposed = 11.3%

Discussion

30.	SO_2 reacts with Cl_2 to yield:
Answer» Thionyl chloride Carbonyl chloride Sulphuryl chloride Sulphur monochloride Answer :C

Discussion

31.	SO_(2), reacts with Cl_(2), to form
Answer» `SOCl_(2)` `SO_(2)Cl_(2)` `SCl_(2)` `S_(2)Cl_(2)` SOLUTION :`SO_(2)+Cl_(2) to SO_(2)Cl_(2)`

Discussion

32.	SO_2 reduces cupric ion to cuprous ion in presence of:
Answer» `KOH` `H_2O` `KCNS` `H_2SO_4` ANSWER :C

Discussion

33.	SO_2 reduces:
Answer» `MG` `H_2S` `KMnO_4` `All` ANSWER :C

Discussion

34.	SO_2 pollution affects which part of the plant
Answer» Chloroplast Mitochondria ER Lysosome Answer :A

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35.	SO_2 reacts with chlorine to form
Answer» SULPHUR monochloride Sulphur dichloride Sulphuryl chloride Sulphur trichloride Answer :C

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36.	SO_2 oxidises
Answer» MG `K_2Cr_2O_7` `KMnO_4` All Answer :A

Discussion

37.	SO_(2) is reducing while TeO_(2) is an oxidising agent. Give reasons.
Answer» Solution :Since +6 oxidation state of S is more STABLE than +4, therefore, it can readily donate electrons an hence acts as a reducing AGENT. For example, it reduces ferric to FERROUS salts. `underset("Ferric sulphate")(Fe_(2)(SO_(4))_(3)) + SO_(2) + 2H_(2)O rarr underset("Ferrous sulphate")(2FeSO_(4)) + 2H_(2)SO_(4)` Since due to inert pair effect, the stability of +6 oxidation state DECREASES while the stability of +4 and +2 oxidation states increases down the group. Thus, +4 oxidation state of `TiO_(2)` is less stable than its +2 oxidation state. As a result, it accepts electrons and thus acts an oxidising agent.

Discussion

38.	SO^(2) is used as
Answer» preservation antioxidant sweetening agent both 'a, and 'b' Answer :D

Discussion

39.	SO_(2) is obtained when the following are heated in air
Answer» S `FeS_(2)` HI `HIO_(3)` Solution :`S+O_(2) to SO_(2), 4FeS_(2)+11O_(2) to 2Fe_(2)O_(3) to 8SO_(2)`

Discussion

40.	SO_(2) is more powerful reducing agent in
Answer» ACID medium Basic medium Neutral medium None ANSWER :B

Discussion

41.	SO_(2) is dried by
Answer» <P>`P_(2)O_(5)` `HNO_(3)` Anhyd. `CaCl_(2)` `CuO` ANSWER :A

Discussion

42.	SO_2 is dried by:
Answer» CUO `HNO_3` `P_2O_5` ANHYD. `CaCl_2` ANSWER :C

Discussion

43.	SO_(2) is a strong reducing agent however it also act as an oxidising agent Which of the following reactions shows its oxidising nature ?
Answer» Bleaching flower petals Decolourising ACIDIFIED `KMnO_(4)` solution Reaction with `H_(2)S` to give COLLOIDAL sulphur Turning acidified dichromate paper green ANSWER :C

Discussion

44.	SO_2 is considered as an air pollutant because
Answer» Its concentration increases with temperature increases of atmosphere. It is USED as an insecticide which is air POLLUTANT It reacts with `O_2 and H_2O` to produce ACID RAIN It is a strong oxidant and oxidant oxidizes other components of atmosphere ANSWER :C

Discussion

45.	SO_(2) gas was prepared by (i) burning sulphur in oxygen, (ii) reacting sodium sulphite with dilute H_(2)SO_(4) and (iii) case sulphur and oxygen combined in the ratio of 1:1. the data illustrates the law of:
Answer» CONSERVATION of mass multiple PROPORTIONS CONSTANT proportions RECIPROCAL proportions Answer :C

Discussion

46.	SO_2 + H_2 S toproduct. The final product is
Answer» `H_(2)O + S` `H_(2)SO_(4)` `H_(2)SO_(3)` `H_(2)S_(2)O_(3)` Solution :`SO_(2)` ACTS as an oxidizing agent PARTICULARLY when treated with stronger reducing AGENTS. `SO_(2)` oxidizes `H_(2)S` into S.

Discussion

47.	SO_2 is:
Answer» Acidic Basic Amphoteric Neutral Answer :A

Discussion

48.	SO_(2) gas used as a bleaching agent. Its bleaching action is :
Answer» temporary and DUE to its oxidising nature temporary and due to its REDUCING nature permanent and due to its oxidising nature permenent and due to its reducing nature Answer :B

Discussion

49.	SO_(2) forms an addition compound sulphuryl chloride with Cl_(2) in presence of
Answer» CHARCOAL `C Cl_(4)` `H^(+)//K_(2)Cr_(2O_(7)` `H^(+)//KMO_(4)` ANSWER :A

Discussion

50.	SO_(2) gas can be identified by exposing it to the
Answer» Glass ROD dippend in conc HCl Filter paper dipped in ACIDIFIED `K_(2)Cr_(2)O_(7)` Filter paper dipped in lead acetate solution Glass rod dippend in `NH_(4)OH` Answer :B

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

SOCl_(2) can act as Lewis acid as well as Lewis base because

Soda ash has the chemical formula :

Soaps essentially form a colloidal solution in water and remove the greasy matter by:

Soaps do not from froths easily from hard water because :

Soaps are anionic detergents.

Soaps and detergents are kept in the for which of the following types of compounds?

Explain cationic and anionic detergents with suitable examples.

Soaps.

Soap removes grease by

Soap molecule has two parts, a polar part and a non-palar part. When soap added to water:

Soap is reacted with hard water gives

Soap is an example of an associated colloid.

Soap is a weak antiseptic. What may be added to soaps to improve its antiseptic action?

Soap is a weak antiseptic. What may be added to soaps to improve its antiseptic action ?

Soap is____

Soap emulsifies

Soap cannot form foam with hard water because ......

SO_(3)^(2-)+S^(***) overset("boil")to S S^(***)O_(3)^(2-),S S^(***)O_(3)^(2-)+2H^(+)toH_(2)SO_(3)+S^(***) The above reaction sequence proves:

SO_3 on reacting with conc. HCL gives:

SO_(3) (g) is produced as : SO_(2) (g) + (1)/(2) O_(2) (g) hArr SO_(3) (g) At 900 K, 0.2 mol of SO_(2) and 0.4 mol of O_(2) are taken in 2L vesset. When equilibrium is reaches by concentration of SO_(3) (g) is 0.08 M. Then K_(C)^(0) for reaction is :

SO_(3) can be prepared by which of the following reactions ?

SO_3 gas can be identified by exposing it to the

Sulphur troxide can be obtained by which of the following reaction ?

SO_3 can be obtained by heating:

SO_(2(g))+2H_(2)S_((g))rarr3S_((s))+2H_(2)O_((l)) which will be the method to obtain sulphur sol by reaction shown above?

SO_(2)Cl_(2)hArrSO_(2)+Cl_(2) is the first order gas reaction with k=2.2xx10^(-5)sec^(-1) at 320^(@)C. The percentage of SO_(2)Cl_(2) decomposed on heating for 90 minutes is

SO_2Cl_2 to SO_2 +Cl_2 is a first order gas reaction with k = 2.2 xx 10^(-5) sec^(-1)" at " 320^@C Percentage of SO_2Cl_2 decomposed on heating for 90 minutes is

SO_2 reacts with Cl_2 to yield:

SO_(2), reacts with Cl_(2), to form

SO_2 reduces cupric ion to cuprous ion in presence of:

SO_2 reduces:

SO_2 pollution affects which part of the plant

SO_2 reacts with chlorine to form

SO_2 oxidises

SO_(2) is reducing while TeO_(2) is an oxidising agent. Give reasons.

SO^(2) is used as

SO_(2) is obtained when the following are heated in air

SO_(2) is more powerful reducing agent in

SO_(2) is dried by

SO_2 is dried by:

SO_(2) is a strong reducing agent however it also act as an oxidising agent Which of the following reactions shows its oxidising nature ?

SO_2 is considered as an air pollutant because

SO_(2) gas was prepared by (i) burning sulphur in oxygen, (ii) reacting sodium sulphite with dilute H_(2)SO_(4) and (iii) case sulphur and oxygen combined in the ratio of 1:1. the data illustrates the law of:

SO_2 + H_2 S toproduct. The final product is

SO_2 is:

SO_(2) gas used as a bleaching agent. Its bleaching action is :

SO_(2) forms an addition compound sulphuryl chloride with Cl_(2) in presence of

SO_(2) gas can be identified by exposing it to the

SO_(3)^(2-)+S^() overset("boil")to S S^()O_(3)^(2-),S S^()O_(3)^(2-)+2H^(+)toH_(2)SO_(3)+S^() The above reaction sequence proves: