94420 + Interview Questions in Chemistry in Class 12

1.	Ozone reacts with moist iodine giving:
Answer» `HIO_3` `I_4O_9` `IO_5` `I_2O_5` ANSWER :A

Discussion

2.	Ozone reacts with moist iodine giving
Answer» `I_(2)O_(5)` `I_(4)O_(9)` `IO_(5)` `HIO_(3)` Answer :D

Discussion

3.	Ozone reacts with H_2O_2 to give oxygen, One volume of ozone gives :
Answer» ONE VOLUME of oxygen Half volume of oxygen 1.5 volume of oxygen Two volume of oxygen Answer :D

Discussion

4.	Ozone reacts with dry iodine to give:
Answer» `IO_2` `I_2O_3` `I_2O_4` `I_4O_9` ANSWER :D

Discussion

5.	Ozone reacts with hydrocarbon to from of _______and________.
Answer» ANSWER :A::D

Discussion

6.	Ozone reacts with
Answer» `C_2H_4` `C_2H_2` `C_6H_6` All Answer :D

Discussion

7.	Ozone oxidises PbS to
Answer» PBO `PbSO_(3)` `PbSO_(4)` Pb Answer :C

Discussion

8.	Ozone oxidises iodide to
Answer» IODINE hypoiodite iodate periodate Answer :A

Discussion

9.	Ozone oxidises moist sulphur to
Answer» `H_(2)SO_(4)` `SO_(2)` `SO_(3)` None of the above Answer :A

Discussion

10.	Ozone produced in the atmosphere due to combination of O_2 and noscent oxygen from _____.
Answer» ANSWER :B

Discussion

11.	Ozone on reaction with one of the following reagents uses all its 3 oxygen atoms for oxidation
Answer» `SO_2` `SnCl_2` in PRESENCE of HCL `CH_2 = CH_2` All Solution :`SO_2 to SO_3, SnCl_2 to SnCl_4` & ozonolysis use up all oxygen ATOMS of `O_3`

Discussion

12.	Ozone oxidises moist sulphur to:
Answer» `SO_2` `SO_3` `H_2SO_4` None Answer :C

Discussion

13.	Ozone (O_3) will not oxidise ............
Answer» `KMnO_(4)` Kl PbS `FeSO_(4)` SOLUTION :MN is in (+7) oxidation STATE.

Discussion

14.	Ozone, on reaction with KI solution, finally produces__________.
Answer» `Cl_2` `I_2` HI `IO_3^(-)` ANSWER :B

Discussion

15.	Ozone (O_3) and oxygen gas (O_2) are examples of
Answer» isotopes allotropes antelopes amphoterism Answer :B

Discussion

16.	Ozone layer of upper atmosphere is being destroyed by :
Answer» CHLOROFLUOROCARBON `SO_2` PHOTOCHEMICAL OXIDANTS `O_2` and `CO_2` smog Answer :A

Discussion

17.	Ozone molecule has_____geometry.
Answer» Linear Triangular Tetrahedral Bent Answer :B

Discussion

18.	Ozone layer is present in :
Answer» Troposphere Stratosphere Mesosphere Exosphere Answer :B

Discussion

19.	Ozone layer is depleted by aen
Answer» NO `NO_(2)` `NO_(3)` `N_(2)O_(5)` ANSWER :A

Discussion

20.	Ozone is used in improving the atmosphere of crowded places. Why?
Answer» Solution :Ozone easily DECOMPOSES to give `O_(2)` and thus improves the percentage of oxyten at crowded places, such as tube RAILWAYS, cinema HALLS, ETC.

Discussion

21.	Ozone is triatomic allotropic form of oxygen.It is an unstable , dark blue diamagnetic gas, O_3 is thermodyanamically unstable and decomposes to O_2(O_3toO_2+O) . Due to the ease with which it liberates atoms of nascent oxygen, it acts as a powerful oxidising agent second only to F_2 is oxidising power. A binary compound of oxygen with anotherelement is called oxide.The oxides vary widely in their nature and properties. KOH+O_2 to[X]+O_2+H_2O [X] is :
Answer» `K_2O_3` `KO_3` `K_2O` `K_2O_2` SOLUTION :`2KOH+5O_3 to 2KO_3`(ORANGE COLOURED ) +`5O_2 +H_2O`

Discussion

22.	Ozone is triatomic allotropic form of oxygen.It is an unstable , dark blue diamagnetic gas, O_3 is thermodyanamically unstable and decomposes to O_2(O_3toO_2+O) . Due to the ease with which it liberates atoms of nascent oxygen, it acts as a powerful oxidising agent second only to F_2 is oxidising power. A binary compound of oxygen with anotherelement is called oxide.The oxides vary widely in their nature and properties. The correct order of acidic strength is :
Answer» `K_2O LT CAO lt SiO_2 lt CuO lt CO_2 lt N_2O_5` `K_2O lt CaOlt CuO lt SiO_2 lt CO_2 lt N_2O_5` `CaO lt K_2Olt SiO_2 lt CuO lt CO_2 lt N_2O_5` `K_2O ltSiO_2 lt CaO lt CuO lt CO_2 lt N_2O_5` Solution :As difference in ELECTRONEGATIVITY between element and oxygen INCREASES, ACIDIC character decreases and basic character increases.

Discussion

23.	Ozone is thermodynamically unstable. Give reasons.
Answer» Solution :`O_(3)` on decomposition gives. `O_(2)` i.e., `2 O_(3) rarr 3 O_(2) , DELTA H^(@) (298 K) = - 142 kJ mol^(-)`. Since `DeltaH` is negative (because `O_(3)` is an endothermic compound) and `DELTAS` is positive (because degree of RANDOMNESS increases on decomposition), therefore, according to Gibbs equation, `Delta G = Delta H - T Delta S, Delta G` is -ve and HENCE decomposition of `O_(3)` is spontaneous. In other words, ozone is themodynamically UNSTABLE.

Discussion

24.	Ozone is triatomic allotropic form of oxygen.It is an unstable , dark blue diamagnetic gas, O_3 is thermodyanamically unstable and decomposes to O_2(O_3toO_2+O) . Due to the ease with which it liberates atoms of nascent oxygen, it acts as a powerful oxidising agent second only to F_2 is oxidising power. A binary compound of oxygen with anotherelement is called oxide.The oxides vary widely in their nature and properties. Which of the following statements is incorrect ?
Answer» `O_3` is used as DISINFECTANT `NO_2` is oxidised to `N_2O_5` by `O_3` `O_3^-` is paramagnetic in nature Dry iodine REACTS with ozone and form `I_2O_5` Solution :(A)Correct statement (B)`2NO_2+O_3 to N_2O_5 + O_2` (C )`O_3^-` is paramagnetic. (D)`2I_2 +9 [O_3] to I_4O_9`(YELLOW solid ) +`9 O_2`

Discussion

25.	Ozone is tested by
Answer» AG HG Zn AU Solution :TAILING of mercury is OBSERVED with `O_(3)`

Discussion

26.	Ozone readily dissolves in
Answer» Water Turpentine oil Carbon disulphide Ammonia Answer :B

Discussion

27.	Ozone is prepared by passing silent electric discharge through oxygen. In this reaction
Answer» Energy is given out Energy is absorbed Oxygen is loaded with energy Oxygen is dissociated into ATOMS SOLUTION :`3O_(2)iff2O_(3^(-)` energy is given out.

Discussion

28.	Ozone is harmful in the environment sigment 'x'but it is useful in the environment sigment 'y'. What are x and y?
Answer» Solution :.X. is troposphere. Ozone is a POLLUTANT. .y. is stratosphere. Ozone ACTS as a PROTECTIVE umbrella.

Discussion

29.	Ozone is manufactured by
Answer» SIEMENS ozonizer Brodie.s ozonizer Siemens and Halske.s ozoiner All Answer :C

Discussion

30.	Ozone is formed by the interaction of water with:
Answer» Chloride Chlorine Fluorine Fluoride Answer :C

Discussion

31.	Ozone is considered to be
Answer» a RESONANCE HYBRID of oxygen an ISOMER of oxygen an oxide of oxygen an allotropic MODIFICATION of oxygen Solution :Ozone `O_3` is allotropic form of oxygen . Other is `O_2`

Discussion

32.	Ozone is a secondary air pollutant.
Answer» ANSWER :A

Discussion

33.	Ozone is a
Answer» MILD OXIDIZING agent Powerful oxidizing agent Powerful REDUCING agent Mild reducing agent Answer :B

Discussion

34.	Ozone is:
Answer» An ISOBAR of oxygen An ISOTOPE of oxygen A POLYMER of oxygen An ALLOTROPE of oxygen Answer :D

Discussion

35.	Ozone hole formation mechanism involves the following reactions: (i) CF_(2)Cl_(2)(g) overset(uv)rarr Cl(g)+CF_(2)Cl(g) (ii) Cl(g)+O_(3)(g) rarr ClO(g)+O_(2)(g) (iii) ClO(g)+O(g) rarr Cl(g)+O_(2)(g) (iv) ClO(g)+NO_(2)(g) rarr ClONO_(2)(g) (v) Cl(g)+CH_(4)(g) rarr CH_(3)(g)+HCl(g) (vi) ClONO_(2)(g)+H_(2)O(g) rarr HOCl(g)+HNO_(3)(g) (vii) ClONO_(2)(g)+HCl(g) rarr Cl_(2)(g)+HNO_(3)(g) (viii) HOCl(g) overset(hv)rarr OH(g)+Cl(g) (ix) Cl_(2)overset(hv)rarr 2Cl(g) Choose the correct set of reaction occuring according to the season in Antarctica.
Answer» SUMMER -(IV), (v) Winter -(vi), (VII) Spring -(viii), (ix) All of these Answer :D

Discussion

36.	Ozone gives brown colour with
Answer» BENZIDINE paper lead ACETATE paper starch IODIDE paper tetramethyl base. Answer :A

Discussion

37.	Ozone does not give oxygen when reacted with
Answer» `SO_(2)` MOIST `I_(2)` PBS HCL ANSWER :A

Discussion

38.	Ozone depletion in the stratosphere is mainly caused by :
Answer» `SO_2` `NO_2` NO `CFCS` ANSWER :D

Discussion

39.	Ozonedepletion is initiatedby
Answer» CI `CIO` `CF_(2) CI` `N_(2) O` Answer :A

Discussion

40.	Ozone depletion in the stratosphere is primarily due to
Answer» `SO_(2)` `NO_(2)` `NO` Chlorofluorocarbons Answer :D

Discussion

41.	Ozone blackens bright silver foil. Here thereaction involved
Answer» OXIDATION REDUCTION TAILING oxidation FOLLOWED by reduction ANSWER :D

Discussion

42.	Ozone day is observed on
Answer» January 30 `April 21` `September 16` `DECEMBER 25` ANSWER :C

Discussion

43.	Ozone can be detected using:
Answer» Ag Hg AgCl NaCl Answer :B

Discussion

44.	Ozone belongs to ……… group of the periodic table:
Answer» ANSWER :D

Discussion

45.	Ozone acts as a powerful oxidising agent .
Answer» Solution : It is DUE to the EASE with which it liberates nascent OXYGEN . `O_(3)rightarrowO_(2)+[O]`

Discussion

46.	Ozone acts as:
Answer» An OXIDISING agent A REDUCING agent Bleaching agent All Answer :D

Discussion

47.	Ozonides are formed by the action of O_3 with
Answer» ALKANES Alkenes or alkynes Metals Non metals Answer :B

Discussion

48.	Oxygen was discovered by:
Answer» Priestley Boyle Scheele Cavendish Answer :A

Discussion

49.	Oxygenstabilieshigheroxidationstatebecause
Answer» it iselectronegative of its TENDENCY forformmultiplebond of large SIZE of smallsize ANSWER :B

Discussion

50.	Oxygen shows catenation behaviour less than sulphur.
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

Explore topic-wise InterviewSolutions in Current Affairs.

Ozone reacts with moist iodine giving:

Ozone reacts with moist iodine giving

Ozone reacts with H_2O_2 to give oxygen, One volume of ozone gives :

Ozone reacts with dry iodine to give:

Ozone reacts with hydrocarbon to from of _______and________.

Ozone reacts with

Ozone oxidises PbS to

Ozone oxidises iodide to

Ozone oxidises moist sulphur to

Ozone produced in the atmosphere due to combination of O_2 and noscent oxygen from _____.

Ozone on reaction with one of the following reagents uses all its 3 oxygen atoms for oxidation

Ozone oxidises moist sulphur to:

Ozone (O_3) will not oxidise ............

Ozone, on reaction with KI solution, finally produces__________.

Ozone (O_3) and oxygen gas (O_2) are examples of

Ozone layer of upper atmosphere is being destroyed by :

Ozone molecule has_____geometry.

Ozone layer is present in :

Ozone layer is depleted by aen

Ozone is used in improving the atmosphere of crowded places. Why?

Ozone is thermodynamically unstable. Give reasons.

Ozone is tested by

Ozone readily dissolves in

Ozone is prepared by passing silent electric discharge through oxygen. In this reaction

Ozone is harmful in the environment sigment 'x'but it is useful in the environment sigment 'y'. What are x and y?

Ozone is manufactured by

Ozone is formed by the interaction of water with:

Ozone is considered to be

Ozone is a secondary air pollutant.

Ozone is a

Ozone is:

Ozone gives brown colour with

Ozone does not give oxygen when reacted with

Ozone depletion in the stratosphere is mainly caused by :

Ozonedepletion is initiatedby

Ozone depletion in the stratosphere is primarily due to

Ozone blackens bright silver foil. Here thereaction involved

Ozone day is observed on

Ozone can be detected using:

Ozone belongs to ……… group of the periodic table:

Ozone acts as a powerful oxidising agent .

Ozone acts as:

Ozonides are formed by the action of O_3 with

Oxygen was discovered by:

Oxygenstabilieshigheroxidationstatebecause

Oxygen shows catenation behaviour less than sulphur.

Ozone reacts with hydrocarbon to from of _and__.