94420 + Interview Questions in Chemistry in Class 12

1.	Sulphuric acid reacts with sodium hydroxide as follows : H_(2)SO_(2)+2NaOH - Na_(2)SO_(4)+2H_(2)O When 1 L of 0.1 M sulphuric acid solution is allowed to react will 1L of 0.1 M sodium hydroxide solution, the amount of sodium sulphate formed and its molarity in the solution obtained is
Answer» `"0.1 mol L"^(-1)` 7.10 g `"0.025 mol L"^(-1)` 3.55 g Solution :`"1 L of 0.1 M" H_(2)SO_(4)" contains = 0.1 mole of "H_(2)SO_(4)` `"1 L of 0.1 M NaOH contains = 0.1 mole of NaOH"` According to the given equation, 1 mole of `H_(2)SO_(4)` reacts with 2 moles of NaOH. Hence 0.1 mole of NaOH will REACT with 0.05 mole of `H_(2)SO_(4)` (and 0.05 mole of `H_(2)SO_(4)` will be left unreacted), i.e., NaOH is the limiting reactant.. 2 moles of NaOH produce 1 mole of `Na_(2)SO_(4)`. Hnece 0.1 mole of NaOH will produce 0.05 mole of `Na_(2)SO_(4)` `=0.05xx(46+32+64)g=0.05xx142g=7.10g` Volume of solution after MIXING = 2 L `H_(2)SO_(4)` left unreacted in the solution = 0.05 mole `therefore"Molarity of the solution "=(0.05)/(2)=0.025" mol L"^(-1)`

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2.	Sulphurous acid can be used as:
Answer» OXIDISING agent Reducing agent Bleaching agent All of the above Answer :D

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3.	Sulphuric acid reacts with PCl_5 to yield.
Answer» Thionyl chloride Sulphuryl chloride Phosphoric ACID SULPHUR monochloride Answer :B

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4.	Sulphuric acid reacts with formic acid to give the main product :
Answer» `CO_(2) and CO` `C` `HCHO` `CO`. ANSWER :D

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5.	Sulphuric acid molecule contains :
Answer» only COVALENT BONDS covalent and IONIC bonds covalent and COORDINATE bonds covalent, ionic and coordinate bonds Answer :D

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6.	Sulphuric acid on heating with sulphur powders gives:
Answer» `H_2SO_3` `SO_3` `SO_2 and SO_3` `SO_2` ANSWER :D

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7.	Sulphuric acid as used
Answer» In LEAD STORAGE batteries As a DEHYDRATING agent In MAKING fertilizers All Answer :D

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8.	Sulphuric acid is used A) In petroleum refining B) In galvanising C) IN making fertilizers
Answer» A,B B,C A,C A,B,C Answer :D

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9.	sulphuric acid is produced when Sulphur dioxide reacts with oxygen and water in the presence of a catalyst : 2SO_(2)(g) + O_(2) (g) + 2H_(2)O(l) to2H_(2)SO_(4). If 5.6 mol of SO_(4) reacts with 4.8 mol of O_(2) and a large excess of water , what is the maximum number of moles of H_(2)SO_(4) that can be obtained ?
Answer» ANSWER :`5.6`

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10.	Sulphuric acid is used:
Answer» in LEAD storage batteries as a DEHYDRATING agent in making fertilizers as a pickling reagent Answer :A::B::C::D

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11.	Sulphuric acid is not used for preparation of original solution in analysis of basic radicals because
Answer» it is a reducing agent it forms insoluble SULPHATE with certain BASIC radicals it forms a soluble complex it is viscous in nature Solution :DUE to FORMATION of precipitate some times

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12.	Sulphuric acid is manufactured by contact process, catalyst used in contact process is, ……………. .
Answer» `V_(2)O_(5)` `TiCl_(4)` `Fe` `MO` Solution :`Fe`

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13.	Sulphuric acid is dibasic acid in nature: hence, it forms:
Answer» NORMAL SALT ACIDIC and basic salt Acidic salt Double salt SOLUTION :`NaOH+H_(2)SO_(4) to NaHSO_(4) +H_(2)O, 2NaOH+H_(2)SO_(4) to Na_(2)SO_(4)+2H_(2)O`

Discussion

14.	Sulphuric acid is a dehydrating agent. Give one example.
Answer» Solution :Conc. `H_(2)SO_(4)` has a strong AFFINITY for water and hence it acts as a strong dehydrating agent. For EXAMPLE, Charring of CANE sugar : `underset("Sugar")(C_(12)H_(22)O_(11)) overset(Conc. H_(2)SO_(4))rarr underset("Sugar CHARCOAL")(12 C) +11 H_(2)O`

Discussion

15.	Sulphuric acid has great affinity for water because
Answer» it hydrolyses the acid it DECOMPOSES the acid acid forms hydrates with WATER acid decomposes water. Solution :Sulphuric acid forms hydrates with water and that.s why SHOW GREAT AFFINITY for water.

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16.	Sulphuric acid acts as a powerful dehydrating agent. How many no of carbons are formed when glucose molecule is dehydratredby H_(2)SO_(4) as reagent
Answer» SOLUTION :`C_(6)H_(12)O_(6)+H_(2)SO_(4) to 6C+6H_(2)O`

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17.	Sulphuric acid can not be used
Answer» As a PICKLING agent In LEAD STORAGE batteries In WHITE paints In manufacuture of dyes Answer :C

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18.	Sulphuric acid can be used as:
Answer» Hygroscopic agent oxidising agent sulphonating agent efflorescent SOLUTION :`H_(2)SO_(4)` does not act as efflorescent.

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19.	Sulphuric acid can be manufactured by ………………… .
Answer» OSTWALD's PROCESS LEAD chamber process Deacon's process Haber's process SOLUTION :Lead chamber process

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20.	Sulphurdioxide gas has ……………..odour.
Answer» SOLUTION :SUFFOCATING

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21.	Sulphur trioxide is preparedby the following two reactions: S_(8)(s)+8O_(2)(g)rarr8SO_(2)(g) 2SO_(2)(g)+O_(2)(g)rarr2SO_(3)(g) How many grams of SO_(3) are produced from 1 mole S_(8)?
Answer» 1280 640 960 320 Solution :From the GIVEN reaction, it is CLEAR that, 1 mole `S_(8)` will give 8 moles of `SO_(3)`. `THEREFORE` Mass of `SO_(3)` formed will be `=80xx8=640g`.

Discussion

22.	Sulphur trioxide may be prepared by the following two reactions : S_(8) + 8O_(2)(g) to 8SO_(2)(g) 2SO_(2)(g) + O_(2) to 2SO_(3)(g) How many grams of SO_(3) will be produced from 1 mol of S_(8) ?
Answer» ANSWER :640

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23.	Sulphur uses ...... orbitals for bonding in H_(2)S
Answer» `sp^(3)` `sp ^(2)` one s and one p pure p ORBITALS ANSWER :D

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24.	Sulphur trioxide gas when dissolved in H_(2)SO_(4) the product obtained is :
Answer» `H_(2)SO_(3)` `H_(2)SO_(5)` `H_(2)S_(2)O_(7)` `H_(2)S_(2)O_(8)` Solution :`H_(2)SO_(4)+SO_(3) to underset("Acid")underset("Pyrosulphuric")underset("OLEUM")(H_(2)S_(2)O_(7))`

Discussion

25.	Sulphur trioxide 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)+PCI_(5) overset(Delta)to` Solution :`Fe_(2)(SO_(4))_(3) overset(Delta)to Fe_(2)O_(3)+SO_(3)`

Discussion

26.	Sulphur trioxide can be obtained by which of the following reaction ?
Answer» `CaSO_(4) + C OVERSET(Delta)RARR` `Fe_(2)(SO_(4))_(3) overset(Delta)rarr` `S + H_(2) SO_(4) overset(Delta)rarr` `H_(2)SO_(4) + PCl_(5) overset(Delta)rarr` Solution :`Fe_(2)(SO_(4))_(3)overset(Delta)rarr Fe_(2)O_(3) + 3SO_(3)`

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27.	Sulphur trioxide gas is:
Answer» PREPARED by HEATING ferric sulphate An anhydride of `H_2SO_4` Used for PREPARING oleum All Answer :D

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28.	Sulphur sol is an example of :
Answer» ASSOCIATED colloid Multi molecular colloid Hydrophilic colloid. MACRO molecular colloid Solution :Macromolecular COLLOIDS are lyophillic. Therefore, these can not be easily COAGULATED.

Discussion

29.	Sulphur reacts with HNO_(3) to form
Answer» `H_(2)SO_(3)` `H_(2)SO_(4)` `SO_(2)` `SO_(3)` SOLUTION :`2HI+H_(2)SO_(4) to 6NO_(2)+H_(2)SO_(4)+2H_(2)O` `S+H_(2)O+3O to H_(2)SO_(4)` =`6HNO_(3)+S to 6NO_(2)+H_(2)SO_(4)+2H_(2)O`

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30.	Sulphur shows maximum coordination number is SX _(n). Where 'X' is
Answer» F Br I Cl Answer :A

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31.	Sulphur reacts with chlorine in 1 : 2 ratio and forms X. Hydrolysis of X gives a sulphur compound Y. What is the hybridisation state of central atom in the anion of Y ?
Answer» `SP^(3)` sp `sp^(2)` `sp^(3)d` ANSWER :A

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32.	Sulphur on oxidation with hot sulphuric acid gives:
Answer» `SO_3` `SO_2` `H_2SO_4` None Answer :B

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33.	Sulphur molecule is
Answer» `S_2` `S_4` `S_6` `S_8` ANSWER :D

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34.	Sulphur molecule is :diatomic,tetratomic,triatomic,octatomic.
Answer» diatomic tetratomic triatomic octatomic Answer :D

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35.	Sulphur is soluble in:
Answer» Water Dilute HCl Ether `CS_2` ANSWER :D

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36.	Sulphur is readily soluble in
Answer» water alcohol ether `CS_(2)` ANSWER :D

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37.	Sulphur is oxidised by H_2SO_4 gives
Answer» `SO_(2)` `SO_(3)` `SO_(4)` `H_(2)SO_(3)` ANSWER :A

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38.	Sulphur is extracted from underground sulphur- bearing rocks by
Answer» Frasch process Contact process Spring's process none of the above Answer :A

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39.	Sulphur in water is an example of colloids.
Answer» lyophilic lyophobic emulsion gel Answer :B

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40.	Sulphur is availble as various sulphates. A 'Mg' salt called Epsom contains how many number of H_(2)O molecules?
Answer» Solution :Epsom SALT - `MgSO_(4).7H_(2)O`

Discussion

41.	Sulphur in SO_2 is :
Answer» SP-hybridised `sp^2`hybridised `sp^ 3`-hybridised ` sp^2d`- hybridised Answer :B

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42.	Sulphur hexafluoride is used as a gaseous electrical insulator.
Answer» Solution :`SF_(6)` is a colourless, odourless and non-toxic gas at room temperature. It is thermally stable and CHEMICALLY INERT. Because of its inertness and HIGH tendency to suppress internal discharges, it is used as a gaseous ELECTRICAL insulator in high voltage generators and switch gears.

Discussion

43.	Sulphur has the highest oxidation state in :
Answer» `SO_2` `Na_2S_2O_3` `H_2SO_4` `H_2S` ANSWER :B

Discussion

44.	Sulphur heptoxide is an anhydride of
Answer» `H_(2)S_(2)O_(8)` `H_(2)S_(2)O_(7)` `H_(2)SO_(4)` `H_(2)SO_(5)`. Solution :`S_(2)O_(7) + H_(2)O RARR UNDERSET("Persulphuric ACID")(H_(2)S_(2)O_(8))`

Discussion

45.	Sulphurhas a strongertendency forcatenation thanoxygen - why ?
Answer» Solution :THISIS because S - S bond ( dissolciationenthalpy : `213 kJ .MOL^(-1)`) is strongerthan O - Obond (dissociationenthalpy : `138 KJ.mol^(-1)`).

Discussion

46.	Sulphur has greater tendency for catenation than oxygen why?
Answer» Solution :Bond ENERGY of `S-S` bond `("213 KJ mol"^(-1))` is GREATER than `O-O` bond `("138 KJ mol"^(-1))`. Due to small size of oxygen ATOM there is greater lp - bp repulsion in `O-O`, resulting in weakening of `O-O` bond more than in `S-S` bond. THEREFORE the tendency of catenation in Oxygen is lower than sulphur.

Discussion

47.	Sulphur forms the chlorides S_2Cl_2 and SCl_2. The equivalent mass of sulphur in SCl_2 in 16. Therefore the equivalent mass of sulphur in S_2Cl_2 is:
Answer» 32 16 64 8 Answer :A

Discussion

48.	Sulphur forms hexahalides tetrahalides dihalides and monohalids Sulphur forms only exafluoride but not hexacholorides. Hexabromides and hexaiodes Sulphur halids tend to hydorlyse easily sulphur hexaflouride is an exception of the oxohalids the most important are those of sulphur especially sulphur dichloride oxide (Thoiny chloride) SO_(2)Cl_(2) and sulphur dichloride dioxide (sulphuryl chloride) SO_(2)Cl_(2) these also hydrolyse in water. Sulphuryl chloride is dissolved in water. which of the following statement is wrong about the solution.
Answer» Give white ppt with BARIUM chloride in soluble in any acid The solution contain two DIFFERENT TYPES of acids a monobasic and a dibasic acid The solution can decolourize the permanganate The osication states of the ELEMENTS is `SO_(2)Cl_(2)` do not change when dissolved in water Answer :C

Discussion

49.	Sulphur forms hexahalides tetrahalides dihalides and monohalids Sulphur forms only exafluoride but not hexacholorides. Hexabromides and hexaiodes Sulphur halids tend to hydorlyse easily sulphur hexaflouride is an exception of the oxohalids the most important are those of sulphur especially sulphur dichloride oxide (Thoiny chloride) SO_(2)Cl_(2) and sulphur dichloride dioxide (sulphuryl chloride) SO_(2)Cl_(2) these also hydrolyse in water. Thionyl chloride is dissolved in water. Which of the following statement is wrong about the solution?
Answer» The solution will give white precipitate with baryta water soluble in dil HCI The solution turns ORANGE dichromate to green The solution turns the lead ACETATE paper to back The solution is ACIDIC in nature Answer :C

Discussion

50.	Sulphur forms hexahalides tetrahalides dihalides and monohalids Sulphur forms only exafluoride but not hexacholorides. Hexabromides and hexaiodes Sulphur halids tend to hydorlyse easily sulphur hexaflouride is an exception of the oxohalids the most important are those of sulphur especially sulphur dichloride oxide (Thoiny chloride) SO_(2)Cl_(2) and sulphur dichloride dioxide (sulphuryl chloride) SO_(2)Cl_(2) these also hydrolyse in water. SF_(6) do not hydrolyse in water because
Answer» Due to STRONG S-F bonds which cannot be BROKEN easily Because of STERIC hinderance of six flourine atoms surroundin sulphur `H_(2)O` MOLECULES cannot approach sulphur Due to double bond character of `S-F` bonds because of back bonding from flourine to sulphur All the above Answer :B

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Sulphuric acid reacts with sodium hydroxide as follows : H_(2)SO_(2)+2NaOH - Na_(2)SO_(4)+2H_(2)O When 1 L of 0.1 M sulphuric acid solution is allowed to react will 1L of 0.1 M sodium hydroxide solution, the amount of sodium sulphate formed and its molarity in the solution obtained is

Sulphurous acid can be used as:

Sulphuric acid reacts with PCl_5 to yield.

Sulphuric acid reacts with formic acid to give the main product :

Sulphuric acid molecule contains :

Sulphuric acid on heating with sulphur powders gives:

Sulphuric acid as used

Sulphuric acid is used A) In petroleum refining B) In galvanising C) IN making fertilizers

Sulphuric acid is used:

Sulphuric acid is not used for preparation of original solution in analysis of basic radicals because

Sulphuric acid is manufactured by contact process, catalyst used in contact process is, ……………. .

Sulphuric acid is dibasic acid in nature: hence, it forms:

Sulphuric acid is a dehydrating agent. Give one example.

Sulphuric acid has great affinity for water because

Sulphuric acid acts as a powerful dehydrating agent. How many no of carbons are formed when glucose molecule is dehydratredby H_(2)SO_(4) as reagent

Sulphuric acid can not be used

Sulphuric acid can be used as:

Sulphuric acid can be manufactured by ………………… .

Sulphurdioxide gas has ……………..odour.

Sulphur trioxide is preparedby the following two reactions: S_(8)(s)+8O_(2)(g)rarr8SO_(2)(g) 2SO_(2)(g)+O_(2)(g)rarr2SO_(3)(g) How many grams of SO_(3) are produced from 1 mole S_(8)?

Sulphur trioxide may be prepared by the following two reactions : S_(8) + 8O_(2)(g) to 8SO_(2)(g) 2SO_(2)(g) + O_(2) to 2SO_(3)(g) How many grams of SO_(3) will be produced from 1 mol of S_(8) ?

Sulphur uses ...... orbitals for bonding in H_(2)S

Sulphur trioxide gas when dissolved in H_(2)SO_(4) the product obtained is :

Sulphur trioxide can be obtained by which of the following reaction :

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

Sulphur trioxide gas is:

Sulphur sol is an example of :

Sulphur reacts with HNO_(3) to form

Sulphur shows maximum coordination number is SX _(n). Where 'X' is

Sulphur reacts with chlorine in 1 : 2 ratio and forms X. Hydrolysis of X gives a sulphur compound Y. What is the hybridisation state of central atom in the anion of Y ?

Sulphur on oxidation with hot sulphuric acid gives:

Sulphur molecule is

Sulphur molecule is :diatomic,tetratomic,triatomic,octatomic.

Sulphur is soluble in:

Sulphur is readily soluble in

Sulphur is oxidised by H_2SO_4 gives

Sulphur is extracted from underground sulphur- bearing rocks by

Sulphur in water is an example of colloids.

Sulphur is availble as various sulphates. A 'Mg' salt called Epsom contains how many number of H_(2)O molecules?

Sulphur in SO_2 is :

Sulphur hexafluoride is used as a gaseous electrical insulator.

Sulphur has the highest oxidation state in :

Sulphur heptoxide is an anhydride of

Sulphurhas a strongertendency forcatenation thanoxygen - why ?

Sulphur has greater tendency for catenation than oxygen why?

Sulphur forms the chlorides S_2Cl_2 and SCl_2. The equivalent mass of sulphur in SCl_2 in 16. Therefore the equivalent mass of sulphur in S_2Cl_2 is: