94420 + Interview Questions in Chemistry in Class 12

1.	Oxygen can be obtained from bleaching powder by:
Answer» ADDING DILUTE acid Passing CARBON dioxide Heating with a COBALT salt Adding alkalies Answer :C

Discussion

2.	Oxygen can be absorbed by :
Answer» Sodium hydroxide `CuSO_(4)(AQ)` PYROGALLOL `C_(3)H_(5)OH.` Answer :A

Discussion

3.	Oxygen can obtained by heating:
Answer» `Na_2O` `Fe_2O_3` `Fe_3O_4` `BaO_2` ANSWER :D

Discussion

4.	Oxygen balance in the atmosphere maintained through the process of:
Answer» Photosynthesis Protein SYNTHESIS Amino ACID synthesis FAT synthesis Answer :A

Discussion

5.	Oxygen atom of ether is _________
Answer» very active replacable OXIDISING COMPARATIVELY INERT ANSWER :D

Discussion

6.	Oxygen atom in ether is
Answer» very ACTIVE replacable COMPARATIVELY INERT LESS active SOLUTION :comparatively inert

Discussion

7.	Oxygen and sulphur have difference in their melting point and boiling points. Give reason.
Answer» Solution :DUE to their atomaticity - oxygen exists as diatomic molecule `(O_(2))` where as sulphur exists as polyatomic molecules `(S_(8))`.

Discussion

8.	Oxygen and Sulphur have same
Answer» OUTER electronic configuration ATOMIC size electronic configuration electron affinity ANSWER :A

Discussion

9.	Oxygen and sulphur both are the members of the same group in periodic table but H_(2)O is liquid while H_(2)S is gas because
Answer» molecular WEIGHT of water is more. electronegativity of sulphur is more. `H_(2)S` is weak acid. water molecules are having weak hydrogen bonds between them. Solution :`H_(2)O` is LIQUID but `H_(2)` is a gas. This can be attributed to the PRESENCE of INTERMOLECULAR hydrogen BONDING in case of `H_(2)O`.

Discussion

10.	Oxygen differs from sulphur in:
Answer» EXIST in DIATOMIC state Have ATOMS of same size Form covalent hydrides Form covalent COMPOUNDS with metals Answer :C

Discussion

11.	Oxygen and Ozone are____of each other.
Answer» Isomers ALLOTROPES Isotopes Isobars Solution :allotropes

Discussion

12.	Oxygen and hydrogen gases are produced at the anode and cathode during the electrolysis of fairly concentrate aqueous solution of :
Answer» `K_2SO_4` `AgNO_3` `H_2SO_4` `NAOH` SOLUTION :Anode : `2H_2O to O_2 +4e^(-) + 4H^(+)` , Cathode :`2H_2O + 2e^(-) to H_2 + 2OH^(-)` Anode : `4OH^(-) to 2H_2O + O_2 + 2e^(-)` , Cathode : ` 2H^(+) + 2e^(-) to H_2`

Discussion

13.	Oxygen and hydrogen are at same temperature . The kinetic energy of oxygen molecules will be
Answer» 16 times 4 times equal to k.E of HYDROGEN `1//4`the of the K.E. of hydrogen molecules Answer :C

Discussion

14.	Oxyacid of chlorine with + 5 state of the central atom is
Answer» HYPOCHLOROUS acid chlorous acid chloric acid Perchloric Acid Answer :C

Discussion

15.	Oxyacid of phosphorus that can reduce AGNO_3 to silver is
Answer» `H_3PO_(4)` `H_4P_2O_7` `H_3PO_3` `HPO_3` Solution :`H_(3)PO_(3)+2AgNO_(3)+H_2O to H_(3)PO_(4)+underset(2 AG )(2HNO_(3^(+)))`

Discussion

16.	OXY-haemoglobin contains:
Answer» LESS OXYGEN than haemoglobin More oxygen than haemoglobin Contains more CARBON dioxide Contains less carbon dioxide Answer :B

Discussion

17.	"Oxoanion" + H_(2)Orarr "oxoacid"+OH^(-) Oxoanion is converted into oxoacid by abstraction of proton from water which is initiated by H-bond formation. The increasing strength of H-bond of the given oxoanion is :
Answer» `ClO_(4)^(-)ltSO_(4)^(2-)ltPO_(4)^(3-)ltSiO_(4)^(4-)` `SO_(4)^(2-)ltSO_(4)^(2-)ltPO_(4)^(3-)ltSiO_(4)^(4-)` `ClO_(4)^(-)ltSO_(4)^(2-)ltSiO_(4)^(4-)ltPO_(4)^(4-)` `ClO_(4)^(-)ltPO_(4)^(3-)ltSO_(4)^(2-)ltSiO_(4)^(4-)` Solution :Tendency of `pi`-bond formation is maximum in `ClO_(4)^(-)`, hence, `SiO_(4)^(4-)` will more easily form STRONG H-bond.

Discussion

18.	Oxo process:
Answer» is simply carbonylation or hydroformylation reaction use COBALT CARBONYL hydride `[COH(CO)_(4)]` both statements are correct both statements are INCORRECT

Discussion

19.	Oximes are formed by the action of aldehydes and ketones with:
Answer» `NH_3` `NH_2OH` `NH_2-NH_2` `NH_2CONHNH_2` ANSWER :B

Discussion

20.	Oxidizing and reducing property of elements depends upon
Answer» IONISATION potential oxidation potential electron affinity all of these Solution :All these PROPERTIES are related with electron GAIN or LOSS.

Discussion

21.	Oxidising power of chlorine in aqueous solution can be determined by the parameters indicated below : (1)/(2)Cl_(2)(g)overset((1)/(2)Delta_(diss)H^(Theta))rarrCl(g)overset(Delta_(eg)H^(Theta))rarrCl^(-)(g)overset(Delta_(hyd)H^(Theta))rarrCl^(-)(aq)The energy involved in the conversion of(1)/(2)Cl_(2)(g) " to " Cl^(-)(aq)(Using the data,Delta_(diss)H_(Cl_(2))^(Theta)=240 kJ mol^(-1),Delta_(eg)H_(Cl)^(Theta)=-349 kJ mol^(-1),Delta_(hyd)H_(Cl)^(Theta)=-381 kJ mol^(-1)) will be
Answer» `-610 kJ mol^(-1)` `-850 kJ mol^(-1)` `+120 kJ mol^(-1)` `+152 kJ mol^(-1)` Solution :`DeltaH=(240)/(2)-349-381` `=120-349-381=-610kJ//mol`.

Discussion

22.	Oxidising product of substance Na_(3)AsO_(3) would be
Answer» `As_(2)O_(3)^(3-)` `AsO_(3)^(-3)` `AsO_(2)^(-4)` `AsO_(4)^(-3)` ANSWER :D

Discussion

23.	Oxidising power of chlorine in aqueous solution can be determined by the parameters indicated below : 1/2Cl_(2)(g) overset(1/2 Delta_("diss")H^(Θ))(rarr)Cl(g) overset(Delta_(eg)H^(Θ))(rarr)Cl^(-)(g) overset(Delta_("hyd")H^(Θ))(rarr)Cl^(-)(aq) The energy involved in the conversion of 1/2 Cl_(2)(g) to Cl^(-)(aq) (using the data, Delta_("diss")H_(Cl_(2))^(Θ)=240" kJ mol"^(-1), Delta_("eg") H_(Cl)^(Θ)=-349" kJ mol"^(-1), Delta_("hyd")H_(Cl^(-))^(Θ)=-381" kJ mol"^(-1)) will be -
Answer» `-610" kJ MOL"^(-1)` `-850" kJ mol"^(-1)` `+ 120" kJ mol"^(-1)` `+ 152" kJ mol"^(-1)` SOLUTION :`DeltaH_(1/2 Cl_(2) rarr CL^(-))=1/2 DeltaH_("Diss")^(Θ)+Delta_(Eg)H^()+Delta_("hyd")H^(Θ)=1/2 xx240+(-349)+(-381) =-610" kJ/mol"`

Discussion

24.	Oxidising power of chlorine in aqueous solution can be determined by the parameters indicated below :1/2Cl_(2(g))overset(1/2Delta_(diss)H^(odot))(rarr) Cl_(g)overset(Delta_(cg)H^(odot))(rarr)Cl_((g))^(-) overset(Delta_(hyd)H^(odot))(rarr)Cl^(-)_(aq) The energy involved in the conversion of 1/2Cl_(2(g)) to Cl_((aq))^(-) (using the data,Delta_(diss)H_(CL_(2))^(odot)=240" "KJ" "mol^(-1),Delta_(eg)H_(Cl)^(odot)=-349 KJ" "mol^(-1),Delta_(hyd)H_(Cl^(-))^(odot)=-381KJ" "mol^(-1)) will be
Answer» `-610 KJ" "MOL^(-1)` `-850" "KJ" "mol^(-1)` `+120" "KJ" "mol^(-1)` `+152" "KJ" "mol^(-1)` Answer :A

Discussion

25.	Oxidising power of chlorine in aqueous solution can be determined by the parameters indicated below (1)/(2)CL_(2)(g)overset((1)/(2)Delta_(diss)H^(Theta))(rarr)Cl(g)overset(DeltaH_(Eg)^(Theta))(rarr) Cl^(-)(g)overset(Delta_(hyd)H^(Theta))(rarr)Cl^(-)(aq) The energy involved in the conversion of (1)/(2)Cl_(2)(g) to Cl^(-)(aq) (Using the data Delta_(diss)H_(Cl_(2))^(Theta)=240KJ mol^(-1)) Delta_(Eg)H_(Cl)^(Theta)=-349KJmol^(-1) , Delta_(Eg)H_(Cl)^(Theta)=-381KJmol^(-1)) will be
Answer» `+152 kJ MOL^(-1)` `-610 kJ mol ^(-1)` `850 kJ mol ^(-1)` `+ 120 kJ mol ^(-1)` Answer :B

Discussion

26.	Oxidising power of chlorine in aqueous solution can be determined by the parameters indicated below : (1)/(2) Cl_(2) (g) overset((1)/(2) Delta_("diss") H^(Theta))(to) Cl (g) overset( Delta_(eg) H^(oplus))(to) Cl^(-) (g) overset(Delta_(hyd) H^(Theta))(to) Cl^(-) (aq) The energy involved in the conversion of (1)/(2) Cl_(2)(g) to Cl^(-) (aq) (using the data , Delta_("diss") H_(Cl_(2))^(Theta) = 240 kJ mol^(-1) , Delta_(eg) = - 349 kJ mol^(-1) , Delta_(hyd) H_(Cl^(-))^(Theta) = -381 kJ mol^(-1)) will be -
Answer» `-610 kJ MOL^(-1)` `-850 kJ mol^(-1)` `+120 kJ mol^(-1)` `+152 kJ mol^(-1)` Answer :A

Discussion

27.	Oxidising power depends on:
Answer» REDUCTION potential Electrons affinity lonisation energy None of the above Answer :A

Discussion

28.	Oxidising agent in Etard oxidation is
Answer» `K_(2)Cr_(2)O_(2) +dil.H_(2)SO_(4)` `KOH+KMNO_(4)` `dil.NHO_(3)` `CrO_(2)Cl_(2)" in "CS_(2)` Answer :D

Discussion

29.	Oxidising action increases from left to right in the following order
Answer» `Cl_2ltBr_2ltI_2ltF_2` `Cl_2ltI_2ltBr_2ltF_2` `I_2ltF_2ltCl_2ltBr_2` `I_2ltBr_2ltCl_2ltF_2` ANSWER :D

Discussion

30.	Oxides of which of the following metals show oxidation state of +8 ?
Answer» Ru Os Mn Zn ANSWER :A::B

Discussion

31.	Oxides of which of the following melals show oxidation state of +8 ?
Answer» `RU` Os Mn Zn Solution :`RuO_4 : OsO_4`

Discussion

32.	Oxides of sulphur and nitrogen are important pollutants of
Answer» AIR and water Air Water Soil Answer :B

Discussion

33.	Oxides of sulphur and nitrogen
Answer» `H_(2)S` `H_(2)Te` `H_(2)SE` `H_(2)O` Solution :All hydrides except H0 acts as reducing agents, The reducing nature INCREASES as the atomic NUMBER of the central ATOM increases. This is due to weakening of M-H bond as the bond LENGTH increases with increase in size of sulphur and nitrogen.

Discussion

34.	Oxides of silicon are:
Answer» Liquids Solids Gases None ANSWER :B

Discussion

35.	Oxides of group 13 elements are:
Answer» Acidic Basic Amphoteric All of these Answer :D

Discussion

36.	Oxide that is prepared by dehydration of strongest oxidising agent is
Answer» `Cl_2O` `ClO_2` `Cl_2O_6` `Cl_2O_7` ANSWER :D

Discussion

37.	Oxide ores are concentrated by………
Answer» HAND picking hydraulic washing froth FLOATATION process Magnetic SEPRATION process Answer :B

Discussion

38.	Oxide of nitrogen which is soluble in alcohol is:
Answer» `NO_2` `N_2O` `N_2O_3` `NO` ANSWER :B

Discussion

39.	Oxide of nitrogen which acts as oxidising as well as reducing agent is
Answer» NO `N_2O_5` `NO_2` `N_2O` ANSWER :A

Discussion

40.	Oxide of nitrogen used as catalyst in lead chamber process for the manufacture of H_2SO_4 is:
Answer» `NO` `N_2O` `N_2O_3` `N_2O_5` ANSWER :A

Discussion

41.	Oxide of nitrogen used as catalyst in lead chamber process for the manufacture of sulphuric acid is:
Answer» NO `N_2O` `N_2O_3` `N_2O_5` ANSWER :A

Discussion

42.	Oxide of nitrogen used as a catalyst in the lead chamber process for the manufacture of sulphuric acid is
Answer» NO `N_(2)O` `N_(2)O_(3)` `N_(2)O_(5)` ANSWER :A

Discussion

43.	Oxide of metal cation which is not amphoteric?
Answer» `AL^(3+)` `Cr^(3+)` `Fe^(3+)` `Zn^(2+)` ANSWER :C

Discussion

44.	Oxide of metal cation which is not amphoteric ?
Answer» `AL^(+3)` `CR^(+3)` `FE^(+3)` `Zn^(+2')` SOLUTION :`Fe_(2)O_(3)` basic OXIDE

Discussion

45.	Oxide of boron dissolves is strong alkalies to give :
Answer» boric acid borates meta borates boron hydroxide. Solution :`B_(2)O_(3)+2NaOH rarr underset("SOD. Metaborate")(2NaBO_(2)+H_(2)O)`

Discussion

46.	Oxide of a non-metal possesses the following characteristics: It is both a proton donor and proton acceptor It is poor conductor of electricity It reacts readily with basic and acidic oxides It oxidises Fe at boiling point. The oxide is:
Answer» `H_2O` `CO_2` `H_2O_2` NO Answer :A

Discussion

47.	..........oxide is linear.
Answer» `N_(2)O` `N_(2)O_(3)` `N_(2)O_(4)` `NO_(2)` SOLUTION :Structure of `N_(2)O` is N-N- O type.

Discussion

48.	Oxidation takes place at _______ and reduction takes place at __________.
Answer» ANODE, cathode cathode, anode anode cathode Answer :A

Discussion

49.	Oxidationstatesofthe metalin theminerals heamatiteandmagnetite,respectively, are
Answer» II, III inhaematiteandIII in magnetite II,III in haematiteandII in magnetite. II in haematiteandII ANDIII in magnetite. III in haematiteandIIand III in magnetite. SOLUTION :Haematite :` Fe_2(III)O_3` , Magnetite:` Fe_ 3 O _ 4= FeO. Fe_2 O _ 3-= Fe (II) O. Fe_ 2(III) O _3.`

Discussion

50.	Oxidation states of the metal in the minerals haematite and magnetite, respectively, are....
Answer» II, III haematite and III in MAGNETITE. II, III in haematite and II in magnetite. II in haematite and II, III in magnetite. III in haematite and II, III in magnetite. SOLUTION :(i) Haematite `Fe_(2)O_(3) :Fe` `:. 2x + 3 (-2) = 0` `:.x = 3` (ii) Magnetite `(Fe_2O_4)` is MIXTURE of `FeO` and `Fe_2O_3` `:. FeOFe = 2` `Fe_2 O_3 Fe = 3`

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Oxygen can be obtained from bleaching powder by:

Oxygen can be absorbed by :

Oxygen can obtained by heating:

Oxygen balance in the atmosphere maintained through the process of:

Oxygen atom of ether is _________

Oxygen atom in ether is

Oxygen and sulphur have difference in their melting point and boiling points. Give reason.

Oxygen and Sulphur have same

Oxygen and sulphur both are the members of the same group in periodic table but H_(2)O is liquid while H_(2)S is gas because

Oxygen differs from sulphur in:

Oxygen and Ozone are____of each other.

Oxygen and hydrogen gases are produced at the anode and cathode during the electrolysis of fairly concentrate aqueous solution of :

Oxygen and hydrogen are at same temperature . The kinetic energy of oxygen molecules will be

Oxyacid of chlorine with + 5 state of the central atom is

Oxyacid of phosphorus that can reduce AGNO_3 to silver is

OXY-haemoglobin contains:

"Oxoanion" + H_(2)Orarr "oxoacid"+OH^(-) Oxoanion is converted into oxoacid by abstraction of proton from water which is initiated by H-bond formation. The increasing strength of H-bond of the given oxoanion is :

Oxo process:

Oximes are formed by the action of aldehydes and ketones with:

Oxidizing and reducing property of elements depends upon

Oxidising product of substance Na_(3)AsO_(3) would be

Oxidising power depends on:

Oxidising agent in Etard oxidation is

Oxidising action increases from left to right in the following order

Oxides of which of the following metals show oxidation state of +8 ?

Oxides of which of the following melals show oxidation state of +8 ?

Oxides of sulphur and nitrogen are important pollutants of

Oxides of sulphur and nitrogen

Oxides of silicon are:

Oxides of group 13 elements are:

Oxide that is prepared by dehydration of strongest oxidising agent is

Oxide ores are concentrated by………

Oxide of nitrogen which is soluble in alcohol is:

Oxide of nitrogen which acts as oxidising as well as reducing agent is

Oxide of nitrogen used as catalyst in lead chamber process for the manufacture of H_2SO_4 is:

Oxide of nitrogen used as catalyst in lead chamber process for the manufacture of sulphuric acid is:

Oxide of nitrogen used as a catalyst in the lead chamber process for the manufacture of sulphuric acid is

Oxide of metal cation which is not amphoteric?

Oxide of metal cation which is not amphoteric ?

Oxide of boron dissolves is strong alkalies to give :

Oxide of a non-metal possesses the following characteristics: It is both a proton donor and proton acceptor It is poor conductor of electricity It reacts readily with basic and acidic oxides It oxidises Fe at boiling point. The oxide is:

..........oxide is linear.

Oxidation takes place at _______ and reduction takes place at __________.

Oxidationstatesofthe metalin theminerals heamatiteandmagnetite,respectively, are

Oxidation states of the metal in the minerals haematite and magnetite, respectively, are....

Oxidation takes place at _ and reduction takes place at ____.